commit 329ce7f4cf2949e21fab34302ad97c58f2e35024 · pci.express/frostium

+16 -2

components/root_server/src/main.zig

···

       2
        
       const os = @import("os.zig");

     

       3
        
       

     

       4
        
       export fn _start() callconv(.c) noreturn {

     

       5
       -
           _ = os.syscall1(SYS_poke, 0xB16B00B5BADBABE);

     

       6
       -
           _ = os.syscall1(SYS_exit, 0x69696969);

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

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       0
        
       
     

       0
        
       
     

       7
        
       

     

       8
        
           die();

     

       9
        
       }

···

       2
        
       const os = @import("os.zig");

     

       3
        
       

     

       4
        
       export fn _start() callconv(.c) noreturn {

     

       5
       +
           // _ = os.syscall1(SYS_poke, 0xB16B00B5BADBABE);

     

       6
       +
           // _ = os.syscall1(SYS_exit, 0x69696969);

     

       7
       +
           asm volatile (

     

       8
       +
               \\ mov $0x69696969, %%rdi

     

       9
       +
               \\ xor %%rsi, %%rsi

     

       10
       +
               \\ xor %%rbx, %%rbx

     

       11
       +
               \\ mainloop:

     

       12
       +
               \\ xor %%rax, %%rax

     

       13
       +
               \\ delayloop:

     

       14
       +
               \\ inc %%rax

     

       15
       +
               \\ cmp $0x4000000, %%rax

     

       16
       +
               \\ jnz delayloop

     

       17
       +
               \\ inc %%rbx

     

       18
       +
               \\ syscall

     

       19
       +
               \\ jmp mainloop

     

       20
       +
           );

     

       21
        
       

     

       22
        
           die();

     

       23
        
       }

+31 -50

components/ukernel/arch/amd64/boot.zig

···

       5
        
       const console = @import("console");

     

       6
        
       const flanterm = @import("flanterm");

     

       7
        
       const log = std.log.scoped(.amd64_init);

     

       8
       -
       const Idt = arch.structures.Idt;

     

       9
        
       const StandardGdt = arch.structures.gdt.StandardGdt;

     

       10
        
       const Tss = arch.structures.tss.Tss;

     

       11
        
       

     
···

       77
        
           arch.per_cpu_init_data.init(limine_requests.mp.response.?.cpu_count);

     

       78
        
       

     

       79
        
           // Install the IDT

     

       80
       -
           initIdt();

     

       81
        
       

     

       82
        
           // Set up our own GDT and TSS

     

       83
        
           const gdt = &arch.per_cpu_init_data.gdt_buf[0];

     
···

       85
        
           const tss = &arch.per_cpu_init_data.tss_buf[0];

     

       86
        
           // TSS rsp 0x3800

     

       87
        
           tss.* = .{

     

       88
       -
               .rsp0 = 0x3800,

     

       89
       -
               .rsp1 = 0x3800,

     

       90
       -
               .rsp2 = 0x3800,

     

       91
        
           };

     

       92
        
       

     

       93
        
           gdt.tss_desc.set_tss_addr(tss);

     
···

       117
        
       

     

       118
        
           // Allocate a stack (0x3000 - 0x4000)

     

       119
        
           common.mm.paging.map(.{

     

       120
       -
               .vaddr = 0x3000,

     

       121
       -
               .size = 0x1000,

     

       122
        
               .memory_type = .MemoryWriteBack,

     

       123
        
               .perms = .{

     

       124
        
                   .x = false,

     
···

       136
        
       

     

       137
        
           init_syscalls();

     

       138
        
       

     

       139
       -
           enter_userspace(entry, 0x69, 0x4000);

     

       140
        
       }

     

       141
        
       

     

       142
        
       // Get ready for system calls (set MSRs)

     
···

       311
        
           }

     

       312
        
       }

     

       313
        
       

     

       314
       -
       pub fn initIdt() void {

     

       315
       -
           const idt_addr: usize = @intFromPtr(arch.per_cpu_init_data.idt);

     

       316
       -
       

     

       317
       -
           // Install the known exception handlers

     

       318
       -
           arch.per_cpu_init_data.idt.breakpoint.installHandler(breakpoint_handler);

     

       319
       -
           arch.per_cpu_init_data.idt.double_fault.installHandler(double_fault);

     

       320
       -
           arch.per_cpu_init_data.idt.general_protection_fault.installHandler(gpf);

     

       321
       -
           arch.per_cpu_init_data.idt.page_fault.installHandler(page_fault);

     

       322
       -
           arch.per_cpu_init_data.idt.interrupts[0xFF - 32].installHandler(arch.interrupts.apic.spurious_interrupt_handler);

     

       323
       -
           arch.per_cpu_init_data.idt.interrupts[48 - 32].installHandler(arch.interrupts.apic.periodic_handler);

     

       324
       -
       

     

       325
       -
           // Load the Idt Register

     

       326
       -
           const reg: Idt.Idtr = .{ .addr = idt_addr, .limit = @sizeOf(Idt) - 1 };

     

       327
       -
           reg.load();

     

       328
       -
       }

     

       329
       -
       

     

       330
        
       // TODO: update the type reflection thing to make a custom

     

       331
        
       // function type for the ISR

     

       332
        
       pub const PageFaultErrorCode = packed struct(u64) {

     
···

       345
        
               return @bitCast(self.*);

     

       346
        
           }

     

       347
        
       };

     

       348
       -
       pub fn page_fault(stack_frame: *arch.structures.Idt.InterruptStackFrame, err_code_u64: u64) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       349
       -
           const err_code: PageFaultErrorCode = @bitCast(err_code_u64);

     

       350
       -
           log.err("PAGE FAULT @ 0x{x:0>16}, code 0x{x}!!!!!!!!!!!", .{ stack_frame.instruction_pointer, err_code.val() });

     

       351
       -
           const cr2 = arch.registers.ControlRegisters.Cr2.read();

     

       352
       -
           switch (err_code.write) {

     

       353
       -
               true => log.err("Tried to write to vaddr 0x{x:0>16}", .{cr2}),

     

       354
       -
               false => log.err("Tried to read from vaddr 0x{x:0>16}", .{cr2}),

     

       355
       -
           }

     

       356
       -
           log.err("dying...", .{});

     

       357
       -
           arch.instructions.die();

     

       358
       -
       }

     

       359
        
       

     

       360
       -
       pub fn breakpoint_handler(stack_frame: *Idt.InterruptStackFrame) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       361
       -
           log.warn("Breakpoint @ 0x{x:0>16}, returning execution...", .{stack_frame.instruction_pointer});

     

       362
       -
       }

     

       363
        
       

     

       364
       -
       pub fn gpf(stack_frame: *Idt.InterruptStackFrame, err_code: u64) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       365
       -
           log.warn("gpf @ 0x{x:0>16} ERR CODE {}, returning execution...", .{ stack_frame.instruction_pointer, err_code });

     

       366
       -
           arch.instructions.die();

     

       367
       -
       }

     

       368
        
       

     

       369
       -
       pub fn double_fault(stack_frame: *Idt.InterruptStackFrame, err_code: u64) callconv(.{ .x86_64_interrupt = .{} }) noreturn {

     

       370
       -
           log.err("FATAL DOUBLE FAULT @ 0x{x:0>16}, code 0x{x}!!!!!!!!!!!", .{ stack_frame.instruction_pointer, err_code });

     

       371
       -
           log.err("dying...", .{});

     

       372
       -
           arch.instructions.die();

     

       373
       -
       }

     

       374
        
       

     

       375
        
       fn bootstrapAPs() void {

     

       376
        
           log.info("Bootstrapping APs...", .{});

     
···

       382
        
       

     

       383
        
       fn ap_init(mp_info: *limine.SmpMpFeature.MpInfo) callconv(.c) noreturn {

     

       384
        
           // Set up the IDT

     

       385
       -
           const idt_addr: usize = @intFromPtr(arch.per_cpu_init_data.idt);

     

       386
       -
           const reg: Idt.Idtr = .{ .addr = idt_addr, .limit = @sizeOf(Idt) - 1 };

     

       387
       -
           reg.load();

     

       388
        
       

     

       389
        
           // Set up our GDT and TSS

     

       390
        
           const gdt = &arch.per_cpu_init_data.gdt_buf[mp_info.processor_id];

···

       5
        
       const console = @import("console");

     

       6
        
       const flanterm = @import("flanterm");

     

       7
        
       const log = std.log.scoped(.amd64_init);

     

       0
        
       
     

       8
        
       const StandardGdt = arch.structures.gdt.StandardGdt;

     

       9
        
       const Tss = arch.structures.tss.Tss;

     

       10
        
       

     
···

       76
        
           arch.per_cpu_init_data.init(limine_requests.mp.response.?.cpu_count);

     

       77
        
       

     

       78
        
           // Install the IDT

     

       79
       +
           arch.interrupts.idt.init();

     

       80
        
       

     

       81
        
           // Set up our own GDT and TSS

     

       82
        
           const gdt = &arch.per_cpu_init_data.gdt_buf[0];

     
···

       84
        
           const tss = &arch.per_cpu_init_data.tss_buf[0];

     

       85
        
           // TSS rsp 0x3800

     

       86
        
           tss.* = .{

     

       87
       +
               .rsp0 = 0x7ffe_0000_8000,

     

       88
       +
               .rsp1 = 0x7ffe_0000_8000,

     

       89
       +
               .rsp2 = 0x7ffe_0000_8000,

     

       90
        
           };

     

       91
        
       

     

       92
        
           gdt.tss_desc.set_tss_addr(tss);

     
···

       116
        
       

     

       117
        
           // Allocate a stack (0x3000 - 0x4000)

     

       118
        
           common.mm.paging.map(.{

     

       119
       +
               .vaddr = 0x7ffe_0000_0000,

     

       120
       +
               .size = 65536,

     

       121
        
               .memory_type = .MemoryWriteBack,

     

       122
        
               .perms = .{

     

       123
        
                   .x = false,

     
···

       135
        
       

     

       136
        
           init_syscalls();

     

       137
        
       

     

       138
       +
           enter_userspace(entry, 0x69, 0x7ffe_0001_0000);

     

       139
        
       }

     

       140
        
       

     

       141
        
       // Get ready for system calls (set MSRs)

     
···

       310
        
           }

     

       311
        
       }

     

       312
        
       

     

       0
        
       
     

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       0
        
       
     

       313
        
       // TODO: update the type reflection thing to make a custom

     

       314
        
       // function type for the ISR

     

       315
        
       pub const PageFaultErrorCode = packed struct(u64) {

     
···

       328
        
               return @bitCast(self.*);

     

       329
        
           }

     

       330
        
       };

     

       331
       +
       // pub fn page_fault(stack_frame: *arch.structures.Idt.InterruptStackFrame, err_code_u64: u64) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       332
       +
       //     const err_code: PageFaultErrorCode = @bitCast(err_code_u64);

     

       333
       +
       //     log.err("PAGE FAULT @ 0x{x:0>16}, code 0x{x}!!!!!!!!!!!", .{ stack_frame.instruction_pointer, err_code.val() });

     

       334
       +
       //     const cr2 = arch.registers.ControlRegisters.Cr2.read();

     

       335
       +
       //     switch (err_code.write) {

     

       336
       +
       //         true => log.err("Tried to write to vaddr 0x{x:0>16}", .{cr2}),

     

       337
       +
       //         false => log.err("Tried to read from vaddr 0x{x:0>16}", .{cr2}),

     

       338
       +
       //     }

     

       339
       +
       //     log.err("dying...", .{});

     

       340
       +
       //     arch.instructions.die();

     

       341
       +
       // }

     

       342
        
       

     

       343
       +
       // pub fn breakpoint_handler(stack_frame: *Idt.InterruptStackFrame) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       344
       +
       //     log.warn("Breakpoint @ 0x{x:0>16}, returning execution...", .{stack_frame.instruction_pointer});

     

       345
       +
       // }

     

       346
        
       

     

       347
       +
       // pub fn gpf(stack_frame: *Idt.InterruptStackFrame, err_code: u64) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       348
       +
       //     log.warn("gpf @ 0x{x:0>16} ERR CODE {}, returning execution...", .{ stack_frame.instruction_pointer, err_code });

     

       349
       +
       //     arch.instructions.die();

     

       350
       +
       // }

     

       351
        
       

     

       352
       +
       // pub fn double_fault(stack_frame: *Idt.InterruptStackFrame, err_code: u64) callconv(.{ .x86_64_interrupt = .{} }) noreturn {

     

       353
       +
       //     log.err("FATAL DOUBLE FAULT @ 0x{x:0>16}, code 0x{x}!!!!!!!!!!!", .{ stack_frame.instruction_pointer, err_code });

     

       354
       +
       //     log.err("dying...", .{});

     

       355
       +
       //     arch.instructions.die();

     

       356
       +
       // }

     

       357
        
       

     

       358
        
       fn bootstrapAPs() void {

     

       359
        
           log.info("Bootstrapping APs...", .{});

     
···

       365
        
       

     

       366
        
       fn ap_init(mp_info: *limine.SmpMpFeature.MpInfo) callconv(.c) noreturn {

     

       367
        
           // Set up the IDT

     

       368
       +
           arch.interrupts.idt.load();

     

       0
        
       
     

       0
        
       
     

       369
        
       

     

       370
        
           // Set up our GDT and TSS

     

       371
        
           const gdt = &arch.per_cpu_init_data.gdt_buf[mp_info.processor_id];

+6 -3

components/ukernel/arch/amd64/interrupts/apic.zig

···

       234
        
               //     .priority_class = 0,

     

       235
        
               //     .priority_sub_class = 0,

     

       236
        
               // });

     

       0
        
       
     

       0
        
       
     

       237
        
           }

     

       238
        
       

     

       239
        
           pub fn calibrateTimer() void {

     
···

       291
        
           }

     

       292
        
       };

     

       293
        
       

     

       294
       -
       pub fn spurious_interrupt_handler(_: *arch.structures.Idt.InterruptStackFrame) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       295
        
           log.warn("Got a spurious interrupt!", .{});

     

       296
        
       }

     

       297
        
       

     

       298
       -
       pub fn periodic_handler(_: *arch.structures.Idt.InterruptStackFrame) callconv(.{ .x86_64_interrupt = .{} }) void {

     

       299
       -
           log.warn("Got an APIC timer interrupt!", .{});

     

       0
        
       
     

       300
        
           singleton.setRegister(.eoi, 0);

     

       301
        
       }

···

       234
        
               //     .priority_class = 0,

     

       235
        
               //     .priority_sub_class = 0,

     

       236
        
               // });

     

       237
       +
               arch.interrupts.idt.add_handler(.{ .interrupt = 0xFF }, spurious_interrupt_handler, 3, 0);

     

       238
       +
               arch.interrupts.idt.add_handler(.{ .interrupt = 48 }, periodic_handler, 3, 0);

     

       239
        
           }

     

       240
        
       

     

       241
        
           pub fn calibrateTimer() void {

     
···

       293
        
           }

     

       294
        
       };

     

       295
        
       

     

       296
       +
       pub fn spurious_interrupt_handler(_: *arch.interrupts.idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       297
        
           log.warn("Got a spurious interrupt!", .{});

     

       298
        
       }

     

       299
        
       

     

       300
       +
       pub fn periodic_handler(stack_trace: *arch.interrupts.idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       301
       +
           log.warn("Got an APIC timer interrupt, incrementing user's %rsi...", .{});

     

       302
       +
           stack_trace.regs.rsi += 1;

     

       303
        
           singleton.setRegister(.eoi, 0);

     

       304
        
       }

+310

components/ukernel/arch/amd64/interrupts/idt.zig

···

       1
       +
       const arch = @import("../root.zig");

     

       2
       +
       const std = @import("std");

     

       3
       +
       const interrupts = arch.interrupts;

     

       4
       +
       const StandardGdt = arch.structures.gdt.StandardGdt;

     

       5
       +
       

     

       6
       +
       // The actual IDT memory

     

       7
       +
       const entry_count = 256;

     

       8
       +
       export var interrupt_descriptor_table: [entry_count]Entry = undefined;

     

       9
       +
       

     

       10
       +
       // Pointers to the actual ISRs which the global interrupt handler call

     

       11
       +
       // Each IDT entry pushes the interrupt number then calls the global

     

       12
       +
       // handler, which pushes more information then calls the user

     

       13
       +
       // defined handler. Use common sense and don't return from an exception

     

       14
       +
       // which shouldn't be returned from.

     

       15
       +
       const DefinedHandler = *const fn (*InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void;

     

       16
       +
       pub export var defined_handlers: [entry_count]DefinedHandler = undefined;

     

       17
       +
       

     

       18
       +
       // The actual handlers with addresses in the IDT.

     

       19
       +
       const ActualHandler = *const fn () callconv(.naked) void;

     

       20
       +
       const actual_handlers: [entry_count]ActualHandler = blk: {

     

       21
       +
           @setEvalBranchQuota(100000000);

     

       22
       +
           var ret: [entry_count]ActualHandler = undefined;

     

       23
       +
           for (0..256) |i| {

     

       24
       +
               ret[i] = make_actual_handler(.{ .interrupt = i });

     

       25
       +
           }

     

       26
       +
           break :blk ret;

     

       27
       +
       };

     

       28
       +
       

     

       29
       +
       fn make_actual_handler(comptime interrupt: Interrupt) ActualHandler {

     

       30
       +
           var asm_code: []const u8 = "";

     

       31
       +
           // Make the stack consistent

     

       32
       +
           if (!interrupt.has_error_code()) {

     

       33
       +
               asm_code = asm_code ++ "pushq $0\n";

     

       34
       +
           }

     

       35
       +
           // Push the interrupt number

     

       36
       +
           asm_code = asm_code ++ std.fmt.comptimePrint("pushq ${}\n", .{interrupt.interrupt});

     

       37
       +
           // Jump to the common interrupt handler code

     

       38
       +
           asm_code = asm_code ++ "jmp _int_handler_common";

     

       39
       +
           const code = asm_code;

     

       40
       +
       

     

       41
       +
           const tmp_struct = struct {

     

       42
       +
               fn actual_handler() callconv(.naked) void {

     

       43
       +
                   asm volatile (code);

     

       44
       +
               }

     

       45
       +
           };

     

       46
       +
           return tmp_struct.actual_handler;

     

       47
       +
       }

     

       48
       +
       

     

       49
       +
       // The global assembly for the common interrupt handler

     

       50
       +
       comptime {

     

       51
       +
           // Construct the push and pop instructions from SavedRegisters

     

       52
       +
           var push_instrs: []const u8 = "\n";

     

       53
       +
           var pop_instrs: []const u8 = "\n";

     

       54
       +
       

     

       55
       +
           const saved_regs = @typeInfo(SavedRegisters).@"struct".fields;

     

       56
       +
           for (saved_regs) |saved_reg| {

     

       57
       +
               // We must prepend to push because pushes are basically

     

       58
       +
               // building the struct in reverse order, so reverse the effects

     

       59
       +
               push_instrs = "\n pushq %" ++ saved_reg.name ++ push_instrs;

     

       60
       +
               // Of course, pop in the opposite order as push

     

       61
       +
               pop_instrs = pop_instrs ++ "popq %" ++ saved_reg.name ++ "\n";

     

       62
       +
           }

     

       63
       +
       

     

       64
       +
           asm (

     

       65
       +
               \\ .global _int_handler_common

     

       66
       +
               \\ .type _int_handler_common, @function

     

       67
       +
               \\ _int_handler_common:

     

       68
       +
       

     

       69
       +
               // Push the general purpose registers and then CR3

     

       70
       +
           ++ push_instrs ++

     

       71
       +
               \\     mov %cr3, %rax

     

       72
       +
               \\     pushq %rax

     

       73
       +
       

     

       74
       +
               // Now, rsp points to the start of InterruptFrame. Read int_num and call into an offset of

     

       75
       +
               // the defined handlers list after setting the first arg to the created structure.

     

       76
       +
           ++ std.fmt.comptimePrint("\nmov {}(%rsp), %rcx\n", .{@offsetOf(InterruptFrame(u64), "int_num")}) ++

     

       77
       +
               \\     mov      %rsp, %rdi

     

       78
       +
               \\     callq    *defined_handlers(, %rcx, 8)

     

       79
       +
       

     

       80
       +
               // Skip the stack all the way down to the general purpose

     

       81
       +
               // registers, then pop all of them

     

       82
       +
               // TODO: restore CR3??

     

       83
       +
           ++ std.fmt.comptimePrint("\nadd ${}, %rsp\n", .{@offsetOf(InterruptFrame(u64), "regs")}) ++ pop_instrs ++

     

       84
       +
               // Skip the interrupt number and error code and iretq

     

       85
       +
               \\     add $16, %rsp

     

       86
       +
               \\     iretq

     

       87
       +
           );

     

       88
       +
       }

     

       89
       +
       

     

       90
       +
       /// IDT Register

     

       91
       +
       const Idtr = packed struct(u80) {

     

       92
       +
           limit: u16,

     

       93
       +
           addr: u64,

     

       94
       +
       

     

       95
       +
           /// Load the IDT Register

     

       96
       +
           pub fn load(self: *const Idtr) void {

     

       97
       +
               asm volatile ("lidt (%[idtr_addr])"

     

       98
       +
                   :

     

       99
       +
                   : [idtr_addr] "r" (self),

     

       100
       +
               );

     

       101
       +
           }

     

       102
       +
       };

     

       103
       +
       

     

       104
       +
       // A raw IDT entry

     

       105
       +
       const Entry = extern struct {

     

       106
       +
           func_low: u16,

     

       107
       +
           gdt_selector: u16,

     

       108
       +
           options: Options,

     

       109
       +
           func_mid: u16,

     

       110
       +
           func_high: u32,

     

       111
       +
           _reserved0: u32 = 0,

     

       112
       +
       

     

       113
       +
           pub const Options = packed struct(u16) {

     

       114
       +
               ist_index: u3,

     

       115
       +
               _reserved0: u5 = 0,

     

       116
       +
               disable_interrupts: bool = true,

     

       117
       +
               // type: Type,

     

       118
       +
               must_be_one: u3 = 0b111,

     

       119
       +
               must_be_zero: u1 = 0,

     

       120
       +
               dpl: u2,

     

       121
       +
               present: bool,

     

       122
       +
           };

     

       123
       +
       

     

       124
       +
           pub const Owner = enum {

     

       125
       +
               kernel,

     

       126
       +
               user,

     

       127
       +
           };

     

       128
       +
       

     

       129
       +
           const Self = @This();

     

       130
       +
           pub fn init(func_ptr: usize, dpl: u2, ist: u3) Entry {

     

       131
       +
               // _ = typ;

     

       132
       +
               return .{

     

       133
       +
                   .func_low = @truncate(func_ptr),

     

       134
       +
                   .gdt_selector = StandardGdt.selectors.kernel_code,

     

       135
       +
                   .options = .{

     

       136
       +
                       .ist_index = ist,

     

       137
       +
                       .dpl = dpl,

     

       138
       +
                       .present = true,

     

       139
       +
                   },

     

       140
       +
                   .func_mid = @truncate(func_ptr >> 16),

     

       141
       +
                   .func_high = @truncate(func_ptr >> 32),

     

       142
       +
               };

     

       143
       +
           }

     

       144
       +
       

     

       145
       +
           // Changes the address without changing anything else

     

       146
       +
           pub fn set_func(self: *Self, ptr: usize) void {

     

       147
       +
               self.func_low = @truncate(ptr);

     

       148
       +
               self.func_mid = @truncate(ptr >> 16);

     

       149
       +
               self.func_high = @truncate(ptr >> 32);

     

       150
       +
           }

     

       151
       +
       };

     

       152
       +
       

     

       153
       +
       /// A selector error code indexing into the GDT, IDT, or LDT.

     

       154
       +
       /// Used in a general protection fault for example.

     

       155
       +
       pub const SelectorErrorCode = packed struct(u64) {

     

       156
       +
           external: bool,

     

       157
       +
           interrupt: bool,

     

       158
       +
           // Only valid if not interrupt

     

       159
       +
           type: enum(u1) {

     

       160
       +
               gdt = 0,

     

       161
       +
               ldt = 1,

     

       162
       +
           },

     

       163
       +
           idx: u13,

     

       164
       +
           _reserved0: u48 = 0,

     

       165
       +
       

     

       166
       +
           pub const Target = union(enum) {

     

       167
       +
               interrupt: Interrupt,

     

       168
       +
               gdt_sel: u16,

     

       169
       +
               ldt_sel: u13,

     

       170
       +
           };

     

       171
       +
       

     

       172
       +
           const Self = @This();

     

       173
       +
           pub fn parse(self: Self) Target {

     

       174
       +
               return switch (self.interrupt) {

     

       175
       +
                   true => .{ .interrupt = @enumFromInt(self.idx) },

     

       176
       +
                   false => switch (self.type) {

     

       177
       +
                       .gdt => .{ .gdt_sel = self.idx },

     

       178
       +
                       .ldt => .{ .ldt_sel = self.idx },

     

       179
       +
                   },

     

       180
       +
               };

     

       181
       +
           }

     

       182
       +
       };

     

       183
       +
       

     

       184
       +
       /// List of the general built in exceptions

     

       185
       +
       pub const Exception = enum(u8) {

     

       186
       +
           divide_error = 0x00,

     

       187
       +
           debug_exeption = 0x01,

     

       188
       +
           non_maskable_interrupt = 0x02,

     

       189
       +
           breakpoint = 0x03,

     

       190
       +
           overflow = 0x04,

     

       191
       +
           bound_range_exceeded = 0x05,

     

       192
       +
           invalid_opcode = 0x06,

     

       193
       +
           device_not_available = 0x07,

     

       194
       +
           double_fault = 0x08,

     

       195
       +
           // _coprocessor_segment_overrun = 0x09,

     

       196
       +
           invalid_tss = 0x0a,

     

       197
       +
           segment_not_present = 0x0b,

     

       198
       +
           stack_segment_fault = 0x0c,

     

       199
       +
           general_protection_fault = 0x0d,

     

       200
       +
           page_fault = 0x0e,

     

       201
       +
           // _reserved0 = 0x0f,

     

       202
       +
           x87_floating_point = 0x10,

     

       203
       +
           alignment_check = 0x11,

     

       204
       +
           machine_check = 0x12,

     

       205
       +
           simd_floating_point = 0x13,

     

       206
       +
           virtualization = 0x14,

     

       207
       +
           control_protection = 0x15,

     

       208
       +
           hypervisor = 0x1c,

     

       209
       +
           vmm = 0x1d,

     

       210
       +
           security_fault = 0x1e,

     

       211
       +
           _,

     

       212
       +
       

     

       213
       +
           fn has_error_code(self: Exception) bool {

     

       214
       +
               return switch (self) {

     

       215
       +
                   .double_fault, .invalid_tss, .segment_not_present, .general_protection_fault, .page_fault, .security_fault => true,

     

       216
       +
                   else => false,

     

       217
       +
               };

     

       218
       +
           }

     

       219
       +
       };

     

       220
       +
       

     

       221
       +
       pub const Interrupt = packed union {

     

       222
       +
           exception: Exception,

     

       223
       +
           interrupt: u8,

     

       224
       +
       

     

       225
       +
           pub fn has_error_code(self: Interrupt) bool {

     

       226
       +
               return self.exception.has_error_code();

     

       227
       +
           }

     

       228
       +
       };

     

       229
       +
       

     

       230
       +
       /// Basically all the general purpose registers except rsp,

     

       231
       +
       /// because RSP is already in the InterruptFrame. Ordered

     

       232
       +
       /// in the order of the X.Reg from the instruction encoding lol

     

       233
       +
       pub const SavedRegisters = extern struct {

     

       234
       +
           rax: u64,

     

       235
       +
           rcx: u64,

     

       236
       +
           rdx: u64,

     

       237
       +
           rbx: u64,

     

       238
       +
           // rsp: u64,

     

       239
       +
           rbp: u64,

     

       240
       +
           rsi: u64,

     

       241
       +
           rdi: u64,

     

       242
       +
           r8: u64,

     

       243
       +
           r9: u64,

     

       244
       +
           r10: u64,

     

       245
       +
           r11: u64,

     

       246
       +
           r12: u64,

     

       247
       +
           r13: u64,

     

       248
       +
           r14: u64,

     

       249
       +
           r15: u64,

     

       250
       +
       };

     

       251
       +
       

     

       252
       +
       /// The Interrupt frame which we help generate

     

       253
       +
       pub fn InterruptFrame(comptime ErrorCode: type) type {

     

       254
       +
           if (@bitSizeOf(ErrorCode) != 64) {

     

       255
       +
               @compileError("ErrorCode for InterruptFrame must be exactly 64 bits!");

     

       256
       +
           }

     

       257
       +
           return extern struct {

     

       258
       +
               // CR3

     

       259
       +
               cr3: u64,

     

       260
       +
               // All the general purpose registers

     

       261
       +
               regs: SavedRegisters align(8),

     

       262
       +
               // The interrupt number

     

       263
       +
               int_num: Interrupt align(8),

     

       264
       +
               // Pushed by the CPU (error_code may be pushed by us)

     

       265
       +
               error_code: ErrorCode,

     

       266
       +
               rip: u64,

     

       267
       +
               cs: u16 align(8),

     

       268
       +
               eflags: u64,

     

       269
       +
               rsp: u64,

     

       270
       +
               ss: u16 align(8),

     

       271
       +
           };

     

       272
       +
       }

     

       273
       +
       

     

       274
       +
       // Initialize the IDT with the default unhandled exception

     

       275
       +
       pub fn init() void {

     

       276
       +
           // Set every IDT entry to the corresponding ActualHandler

     

       277
       +
           for (0..entry_count) |i| {

     

       278
       +
               const actual_handler = @intFromPtr(actual_handlers[i]);

     

       279
       +
               interrupt_descriptor_table[i] = Entry.init(actual_handler, 3, 0);

     

       280
       +
           }

     

       281
       +
           // Now, set every defined handler to the default one

     

       282
       +
           @memset(&defined_handlers, arch.interrupts.unhandled_interrupt);

     

       283
       +
       

     

       284
       +
           // Finally, load the idt

     

       285
       +
           load();

     

       286
       +
       

     

       287
       +
           add_handler(.{ .exception = .breakpoint }, arch.interrupts.breakpoint, 3, 0);

     

       288
       +
           add_handler(.{ .exception = .double_fault }, arch.interrupts.double_fault, 3, 0);

     

       289
       +
           add_handler(.{ .exception = .general_protection_fault }, arch.interrupts.general_protection_fault, 3, 0);

     

       290
       +
           add_handler(.{ .exception = .page_fault }, arch.mm.paging.page_fault_handler, 3, 0);

     

       291
       +
       }

     

       292
       +
       

     

       293
       +
       pub fn load() void {

     

       294
       +
           const idtr: Idtr = .{

     

       295
       +
               .addr = @intFromPtr(&interrupt_descriptor_table),

     

       296
       +
               .limit = 0xFFF,

     

       297
       +
           };

     

       298
       +
           idtr.load();

     

       299
       +
       }

     

       300
       +
       

     

       301
       +
       pub fn add_handler(interrupt: Interrupt, handler: anytype, dpl: u2, ist: u3) void {

     

       302
       +
           // Modify the type, dpl, and ist in place

     

       303
       +
           var tmp = interrupt_descriptor_table[interrupt.interrupt];

     

       304
       +
           tmp.options.dpl = dpl;

     

       305
       +
           tmp.options.ist_index = ist;

     

       306
       +
           interrupt_descriptor_table[interrupt.interrupt] = tmp;

     

       307
       +
       

     

       308
       +
           // Add the DefinedHandler

     

       309
       +
           defined_handlers[interrupt.interrupt] = @ptrCast(&handler);

     

       310
       +
       }

components/ukernel/arch/amd64/interrupts/pic.zig

···

       1
        
       /// Remap the 8259 PIC to an interrupt base of 0x32

     

       2
        
       const arch = @import("../root.zig");

     

       0
        
       
     

       0
        
       
     

       3
        
       const out = arch.port.out;

     

       4
        
       const in = arch.port.in;

     

       5
        
       

     
···

       48
        
           wait();

     

       49
        
           out(u8, PIC_TWO_DATA_PORT, 0b1111_1111);

     

       50
        
           wait();

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       51
        
       }

     

       52
        
       

     

       53
        
       inline fn wait() void {

     
···

       58
        
       pub fn end_of_timer_interrupt() void {

     

       59
        
           out(u8, PIC_ONE_CMD_PORT, CMD_EOI);

     

       60
        
       }

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0

···

       1
        
       /// Remap the 8259 PIC to an interrupt base of 0x32

     

       2
        
       const arch = @import("../root.zig");

     

       3
       +
       const std = @import("std");

     

       4
       +
       const log = std.log.scoped(.pic);

     

       5
        
       const out = arch.port.out;

     

       6
        
       const in = arch.port.in;

     

       7
        
       

     
···

       50
        
           wait();

     

       51
        
           out(u8, PIC_TWO_DATA_PORT, 0b1111_1111);

     

       52
        
           wait();

     

       53
       +
       

     

       54
       +
           // Set up a spurious IRQ7 handler

     

       55
       +
           arch.interrupts.idt.add_handler(.{ .interrupt = 32 + 7 }, spurious_handler, 3, 0);

     

       56
        
       }

     

       57
        
       

     

       58
        
       inline fn wait() void {

     
···

       63
        
       pub fn end_of_timer_interrupt() void {

     

       64
        
           out(u8, PIC_ONE_CMD_PORT, CMD_EOI);

     

       65
        
       }

     

       66
       +
       

     

       67
       +
       pub fn spurious_handler(_: *arch.interrupts.idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       68
       +
           std.log.warn("Got a spurious IRQ7 (8259)", .{});

     

       69
       +
       }

+22

components/ukernel/arch/amd64/interrupts/root.zig

···

       1
        
       pub const apic = @import("apic.zig");

     

       2
        
       pub const pic = @import("pic.zig");

     

       3
        
       pub const pit = @import("pit.zig");

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       4
        
       

     

       5
        
       pub inline fn enable() void {

     

       6
        
           asm volatile ("sti");

     
···

       8
        
       pub inline fn disable() void {

     

       9
        
           asm volatile ("cli");

     

       10
        
       }

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0

···

       1
        
       pub const apic = @import("apic.zig");

     

       2
        
       pub const pic = @import("pic.zig");

     

       3
        
       pub const pit = @import("pit.zig");

     

       4
       +
       pub const idt = @import("idt.zig");

     

       5
       +
       const std = @import("std");

     

       6
       +
       const arch = @import("../root.zig");

     

       7
        
       

     

       8
        
       pub inline fn enable() void {

     

       9
        
           asm volatile ("sti");

     
···

       11
        
       pub inline fn disable() void {

     

       12
        
           asm volatile ("cli");

     

       13
        
       }

     

       14
       +
       

     

       15
       +
       pub fn unhandled_interrupt(stack_frame: *idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       16
       +
           std.log.err("Unhandled interrupt (0x{x})!!! rip = 0x{x}", .{ stack_frame.int_num.interrupt, stack_frame.rip });

     

       17
       +
           arch.instructions.die();

     

       18
       +
       }

     

       19
       +
       

     

       20
       +
       pub fn breakpoint(stack_frame: *idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       21
       +
           std.log.warn("Breakpoint @ 0x{x}, returning execution...", .{stack_frame.rip});

     

       22
       +
       }

     

       23
       +
       

     

       24
       +
       pub fn double_fault(stack_frame: *idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       25
       +
           std.log.err("Double fault @ 0x{x}, dying!!!", .{stack_frame.rip});

     

       26
       +
           arch.instructions.die();

     

       27
       +
       }

     

       28
       +
       

     

       29
       +
       pub fn general_protection_fault(stack_frame: *idt.InterruptFrame(idt.SelectorErrorCode)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       30
       +
           std.log.warn("General Protection Fault @ 0x{x} (Error Code {}), returning execution...", .{ stack_frame.rip, stack_frame.error_code });

     

       31
       +
           arch.instructions.die();

     

       32
       +
       }

components/ukernel/arch/amd64/mm/paging.zig

···

       3
        
       const std = @import("std");

     

       4
        
       const Cr3 = arch.registers.ControlRegisters.Cr3;

     

       5
        
       const Cr4 = arch.registers.ControlRegisters.Cr4;

     

       0
        
       
     

       6
        
       const Perms = common.mm.paging.Perms;

     

       7
        
       

     

       8
        
       pub const PageTable = extern struct {

     
···

       329
        
           len: usize,

     

       330
        
           ptr: usize,

     

       331
        
       };

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0

···

       3
        
       const std = @import("std");

     

       4
        
       const Cr3 = arch.registers.ControlRegisters.Cr3;

     

       5
        
       const Cr4 = arch.registers.ControlRegisters.Cr4;

     

       6
       +
       const idt = arch.interrupts.idt;

     

       7
        
       const Perms = common.mm.paging.Perms;

     

       8
        
       

     

       9
        
       pub const PageTable = extern struct {

     
···

       330
        
           len: usize,

     

       331
        
           ptr: usize,

     

       332
        
       };

     

       333
       +
       

     

       334
       +
       pub fn page_fault_handler(stack_frame: *idt.InterruptFrame(u64)) callconv(.{ .x86_64_sysv = .{} }) void {

     

       335
       +
           std.log.err("Page Fault @ 0x{x}, dying...", .{stack_frame.rip});

     

       336
       +
           arch.instructions.die();

     

       337
       +
       }

+2 -11

components/ukernel/arch/amd64/root.zig

···

       26
        
       const PerCpuInitData = struct {

     

       27
        
           const StandardGdt = structures.gdt.StandardGdt;

     

       28
        
           const Tss = structures.tss.Tss;

     

       29
       -
           const Idt = structures.Idt;

     

       30
        
       

     

       31
        
           gdt_buf: []StandardGdt = undefined,

     

       32
        
           tss_buf: []Tss = undefined,

     

       33
       -
           idt: *Idt = undefined,

     

       34
        
       

     

       35
        
           const Self = @This();

     

       36
        
           pub fn init(self: *Self, cpu_count: u64) void {

     

       37
       -
               // 1. Allocate an IDT

     

       38
       -
               const idt_addr = common.init_data.bootmem.allocMem(@sizeOf(Idt)) catch |err| {

     

       39
       -
                   std.log.err("init PerCpuInitData: IDT alloc failed: {}", .{err});

     

       40
       -
                   @panic("rip bozo");

     

       41
       -
               };

     

       42
       -
               self.idt = @ptrFromInt(idt_addr);

     

       43
       -
       

     

       44
       -
               // 2. Allocate space for GDT and TSS data

     

       45
        
               const gdt_size = @sizeOf(StandardGdt);

     

       46
        
               const tss_size = @sizeOf(Tss);

     

       47
        
       

     
···

       51
        
                   @panic("rip bozo");

     

       52
        
               });

     

       53
        
       

     

       54
       -
               // 3. Transmute and fill out the structure

     

       55
        
               const gdt_buf: [*]StandardGdt = @ptrCast(@alignCast(buf[0 .. gdt_size * cpu_count]));

     

       56
        
               const tss_buf: [*]Tss = @ptrCast(@alignCast(buf[gdt_size * cpu_count ..][0 .. tss_size * cpu_count]));

     

       57
        
               self.gdt_buf = gdt_buf[0..cpu_count];

···

       26
        
       const PerCpuInitData = struct {

     

       27
        
           const StandardGdt = structures.gdt.StandardGdt;

     

       28
        
           const Tss = structures.tss.Tss;

     

       0
        
       
     

       29
        
       

     

       30
        
           gdt_buf: []StandardGdt = undefined,

     

       31
        
           tss_buf: []Tss = undefined,

     

       0
        
       
     

       32
        
       

     

       33
        
           const Self = @This();

     

       34
        
           pub fn init(self: *Self, cpu_count: u64) void {

     

       35
       +
               // 1. Allocate space for GDT and TSS data

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       36
        
               const gdt_size = @sizeOf(StandardGdt);

     

       37
        
               const tss_size = @sizeOf(Tss);

     

       38
        
       

     
···

       42
        
                   @panic("rip bozo");

     

       43
        
               });

     

       44
        
       

     

       45
       +
               // 2. Transmute and fill out the structure

     

       46
        
               const gdt_buf: [*]StandardGdt = @ptrCast(@alignCast(buf[0 .. gdt_size * cpu_count]));

     

       47
        
               const tss_buf: [*]Tss = @ptrCast(@alignCast(buf[gdt_size * cpu_count ..][0 .. tss_size * cpu_count]));

     

       48
        
               self.gdt_buf = gdt_buf[0..cpu_count];

-170

components/ukernel/arch/amd64/structures/Idt.zig

···

       1
       -
       //! The entire Interrupt Descriptor Table (IDT) structure for AMD64,

     

       2
       -
       //! including all the necessary ISR entries. Each of the defined

     

       3
       -
       //! ISRs is meant for a specific type of exception, while the

     

       4
       -
       //! array at the end of the IDT can be used for whatever is necessary.

     

       5
       -
       const std = @import("std");

     

       6
       -
       const arch = @import("../root.zig");

     

       7
       -
       const StandardGdt = arch.structures.gdt.StandardGdt;

     

       8
       -
       

     

       9
       -
       /// Faulty division (mostly divide by zero)

     

       10
       -
       divide_error: Entry(.handler),

     

       11
       -
       /// AMD64 Debug Exception, either a fault or a trap

     

       12
       -
       debug_exception: Entry(.handler),

     

       13
       -
       /// Non Maskable Interrupt

     

       14
       -
       non_maskable_interrupt: Entry(.handler),

     

       15
       -
       /// Breakpoint (int3) trap

     

       16
       -
       breakpoint: Entry(.handler),

     

       17
       -
       /// Overflow trap (INTO instruction)

     

       18
       -
       overflow: Entry(.handler),

     

       19
       -
       /// Bound Range Exception (BOUND instruction)

     

       20
       -
       bound_range_exceeded: Entry(.handler),

     

       21
       -
       /// Invalid Opcode Exception

     

       22
       -
       invalid_opcode: Entry(.handler),

     

       23
       -
       /// Device Not Available (FPU instructions when FPU disabled)

     

       24
       -
       device_not_available: Entry(.handler),

     

       25
       -
       /// Double Fault Exception

     

       26
       -
       double_fault: Entry(.abort_with_err_code),

     

       27
       -
       _coprocessor_segment_overrun: Entry(.handler),

     

       28
       -
       /// Invalid TSS: bad segment selector

     

       29
       -
       invalid_tss: Entry(.handler_with_err_code),

     

       30
       -
       /// Segment Not Present

     

       31
       -
       segment_not_present: Entry(.handler_with_err_code),

     

       32
       -
       /// Stack Segment Fault

     

       33
       -
       stack_segment_fault: Entry(.handler_with_err_code),

     

       34
       -
       /// General Protection Fault

     

       35
       -
       general_protection_fault: Entry(.handler_with_err_code),

     

       36
       -
       /// Page Fault

     

       37
       -
       page_fault: Entry(.handler_with_err_code),

     

       38
       -
       

     

       39
       -
       _reserved1: Entry(.handler),

     

       40
       -
       /// x87 Floating Point Exception

     

       41
       -
       x87_floating_point: Entry(.handler),

     

       42
       -
       /// Alignment Check Exception

     

       43
       -
       alignment_check: Entry(.handler_with_err_code),

     

       44
       -
       /// Machine Check Exception (MCE)

     

       45
       -
       machine_check: Entry(.abort),

     

       46
       -
       /// SIMD Floating Point Exception

     

       47
       -
       simd_floating_point: Entry(.handler),

     

       48
       -
       /// Virtualization Exception

     

       49
       -
       virtualization: Entry(.handler),

     

       50
       -
       /// Control Protection Exception

     

       51
       -
       control_protection: Entry(.handler_with_err_code),

     

       52
       -
       _reserved2: [10]Entry(.handler),

     

       53
       -
       /// User Accessible Interrupts

     

       54
       -
       interrupts: [256 - 32]Entry(.handler),

     

       55
       -
       

     

       56
       -
       /// An ISR Entry in the IDT

     

       57
       -
       pub const EntryType = union(enum) {

     

       58
       -
           abort: void,

     

       59
       -
           abort_with_err_code: void,

     

       60
       -
           handler: void,

     

       61
       -
           handler_with_err_code: void,

     

       62
       -
           handler_with_custom_err_code: type,

     

       63
       -
       };

     

       64
       -
       pub fn Entry(comptime entry_type: EntryType) type {

     

       65
       -
           const return_type = switch (entry_type) {

     

       66
       -
               .abort, .abort_with_err_code => noreturn,

     

       67
       -
               .handler, .handler_with_err_code, .handler_with_custom_err_code => void,

     

       68
       -
           };

     

       69
       -
           const params: []const std.builtin.Type.Fn.Param = switch (entry_type) {

     

       70
       -
               .handler, .abort => &.{

     

       71
       -
                   // Interrupt stack frame

     

       72
       -
                   .{ .is_generic = false, .is_noalias = false, .type = *InterruptStackFrame },

     

       73
       -
               },

     

       74
       -
               .handler_with_err_code, .abort_with_err_code => &.{

     

       75
       -
                   // Interrupt stack frame

     

       76
       -
                   .{ .is_generic = false, .is_noalias = false, .type = *InterruptStackFrame },

     

       77
       -
                   // Error code

     

       78
       -
                   .{ .is_generic = false, .is_noalias = false, .type = u64 },

     

       79
       -
               },

     

       80
       -
               .handler_with_custom_err_code => |err_code_type| &.{

     

       81
       -
                   // Interrupt stack frame

     

       82
       -
                   .{ .is_generic = false, .is_noalias = false, .type = *InterruptStackFrame },

     

       83
       -
                   // Custom Error code

     

       84
       -
                   .{ .is_generic = false, .is_noalias = false, .type = err_code_type },

     

       85
       -
               },

     

       86
       -
           };

     

       87
       -
           const FunctionTypeInfo: std.builtin.Type = .{

     

       88
       -
               .@"fn" = .{

     

       89
       -
                   .calling_convention = .{ .x86_64_interrupt = .{} },

     

       90
       -
                   .is_generic = false,

     

       91
       -
                   .is_var_args = false,

     

       92
       -
                   .return_type = return_type,

     

       93
       -
                   .params = params,

     

       94
       -
               },

     

       95
       -
           };

     

       96
       -
       

     

       97
       -
           // The actual IDT entry structure

     

       98
       -
           return extern struct {

     

       99
       -
               func_low: u16,

     

       100
       -
               gdt_selector: u16,

     

       101
       -
               options: Options,

     

       102
       -
               func_mid: u16,

     

       103
       -
               func_high: u32,

     

       104
       -
               _reserved: u32 = 0,

     

       105
       -
       

     

       106
       -
               const FuncType = @Type(FunctionTypeInfo);

     

       107
       -
       

     

       108
       -
               pub const Options = packed struct(u16) {

     

       109
       -
                   /// Interrupt Stack Table Index

     

       110
       -
                   ist_index: u3,

     

       111
       -
                   _reserved: u5 = 0,

     

       112
       -
                   disable_interrupts: bool,

     

       113
       -
                   must_be_one: u3 = 0b111,

     

       114
       -
                   must_be_zero: u1 = 0,

     

       115
       -
                   /// Descriptor Privilege Level

     

       116
       -
                   dpl: u2,

     

       117
       -
                   present: bool,

     

       118
       -
               };

     

       119
       -
       

     

       120
       -
               const Self = @This();

     

       121
       -
       

     

       122
       -
               pub fn installHandler(self: *Self, func: *const FuncType) void {

     

       123
       -
                   // Fetch the Code Segment

     

       124
       -
                   const func_ptr = @intFromPtr(func);

     

       125
       -
                   self.* = .{

     

       126
       -
                       // Set the function pointer

     

       127
       -
                       .func_low = @truncate(func_ptr & 0xFFFF),

     

       128
       -
                       .func_mid = @truncate((func_ptr >> 16) & 0xFFFF),

     

       129
       -
                       .func_high = @truncate((func_ptr >> 32) & 0xFFFF_FFFF),

     

       130
       -
                       .gdt_selector = StandardGdt.selectors.kernel_code,

     

       131
       -
                       .options = .{

     

       132
       -
                           // No Interrupt Stack Table yet

     

       133
       -
                           .ist_index = 0,

     

       134
       -
                           // Mask interrupts while running ISR handler

     

       135
       -
                           .disable_interrupts = true,

     

       136
       -
                           // Ring 3 Minimum privilege level

     

       137
       -
                           .dpl = 3,

     

       138
       -
                           // Mark as present

     

       139
       -
                           .present = true,

     

       140
       -
                       },

     

       141
       -
                   };

     

       142
       -
               }

     

       143
       -
           };

     

       144
       -
       }

     

       145
       -
       

     

       146
       -
       /// IDT Register

     

       147
       -
       pub const Idtr = packed struct(u80) {

     

       148
       -
           limit: u16,

     

       149
       -
           addr: u64,

     

       150
       -
       

     

       151
       -
           /// Load the IDT Register

     

       152
       -
           pub fn load(self: *const Idtr) void {

     

       153
       -
               asm volatile ("lidt (%[idtr_addr])"

     

       154
       -
                   :

     

       155
       -
                   : [idtr_addr] "r" (self),

     

       156
       -
               );

     

       157
       -
           }

     

       158
       -
       };

     

       159
       -
       

     

       160
       -
       /// Interrupt Stack Frame

     

       161
       -
       /// TODO: maybe move this somewhere else

     

       162
       -
       pub const InterruptStackFrame = extern struct {

     

       163
       -
           instruction_pointer: u64,

     

       164
       -
           code_segment: u16,

     

       165
       -
           _reserved1: [6]u8,

     

       166
       -
           cpu_flags: u64,

     

       167
       -
           stack_pointer: u64,

     

       168
       -
           stack_segment: u16,

     

       169
       -
           _reserved2: [6]u8,

     

       170
       -
       };

-1

components/ukernel/arch/amd64/structures/root.zig

···

       1
        
       pub const gdt = @import("gdt.zig");

     

       2
        
       pub const tss = @import("tss.zig");

     

       3
       -
       pub const Idt = @import("Idt.zig");

···

       1
        
       pub const gdt = @import("gdt.zig");

     

       2
        
       pub const tss = @import("tss.zig");

     

       0

+1 -1

components/ukernel/build.zig

···

       90
        
           });

     

       91
        
       

     

       92
        
           kernel.pie = false;

     

       93
       -
           kernel.want_lto = true;

     

       94
        
           kernel.setLinkerScript(b.path(linker_script_path));

     

       95
        
           b.installArtifact(kernel);

     

       96
        
       }

···

       90
        
           });

     

       91
        
       

     

       92
        
           kernel.pie = false;

     

       93
       +
           kernel.want_lto = false;

     

       94
        
           kernel.setLinkerScript(b.path(linker_script_path));

     

       95
        
           b.installArtifact(kernel);

     

       96
        
       }