diff --git a/build.zig b/build.zig index e8b62f5..34470a1 100644 --- a/build.zig +++ b/build.zig @@ -11,7 +11,7 @@ pub fn build(b: *std.Build) void .os_tag = .freestanding, }), .optimize = .Debug, - .strip = true, + // .strip = true, .code_model = .kernel, .pic = false, .error_tracing = false, diff --git a/sources/kernel/interrupts/gdt.zig b/sources/kernel/interrupts/gdt.zig index c602142..42437bd 100644 --- a/sources/kernel/interrupts/gdt.zig +++ b/sources/kernel/interrupts/gdt.zig @@ -1,4 +1,63 @@ -const GDT_Table = { - var null_descriptor : u8, - -}; \ No newline at end of file + +const GDT_Entry = packed struct { + limit : u16, + base_low : u16, + base_middle : u8, + access : u8, + flags : u8, + base_high : u8 +}; + +const GDT_Pointer = packed struct { + limit : u16, + base : *GDT_Entry +}; + +var GDTEntry : [5]GDT_Entry = undefined; + +var GDTPointer : GDT_Pointer = undefined; + +comptime { + asm ( + \\.type GDT_Flush, @function + \\ GDT_Flush: + \\ mov +4(%esp), %eax + \\ lgdt (%eax) + \\ mov $0x10, %ax + \\ mov %ax, %ds + \\ mov %ax, %es + \\ mov %ax, %fs + \\ mov %ax, %gs + \\ mov %ax, %ss + \\ ljmp $0x08, $1f + \\ 1: ret + ); +} + +extern fn GDT_Flush(*const GDT_Pointer) void; + +pub fn GDT_Init() void +{ + + GDTPointer.limit = @sizeOf(GDT_Entry) * 5 - 1; + GDTPointer.base = &GDTEntry[0]; + + GDT_setGate(0,0,0,0,0); + GDT_setGate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF); + GDT_setGate(2, 0, 0xFFFFFFFF, 0x92, 0xCF); + GDT_setGate(3, 0, 0xFFFFFFFF, 0xFA, 0xCF); + GDT_setGate(4, 0, 0xFFFFFFFF, 0xF2, 0xCF); + + GDT_Flush(&GDTPointer); +} + +pub fn GDT_setGate(num : u32, base : u32, limit : u32, access : u8, flags : u8) void +{ + GDTEntry[num].base_low = @truncate(base); + GDTEntry[num].base_middle = @truncate(base >> 16); + GDTEntry[num].base_high = @truncate(base >> 24); + GDTEntry[num].limit = @truncate(limit); + GDTEntry[num].flags = @truncate(limit >> 16); + GDTEntry[num].flags |= (flags & 0xF0); + GDTEntry[num].access = access; +} \ No newline at end of file diff --git a/sources/kernel/interrupts/idt.zig b/sources/kernel/interrupts/idt.zig index cafd97e..e74530d 100644 --- a/sources/kernel/interrupts/idt.zig +++ b/sources/kernel/interrupts/idt.zig @@ -1,4 +1,5 @@ -// pub const out = @import("io/out.zig"); +pub const out = @import("../io/out.zig"); +pub const kpanic = @import("../panic.zig").kpanic; extern fn isr0()void; extern fn isr1()void; extern fn isr2()void; extern fn isr3()void; extern fn isr4()void; extern fn isr5()void; extern fn isr6()void; extern fn isr7()void; @@ -26,10 +27,10 @@ const IDT_Entry = packed struct const IDT_Pointer = packed struct { limit : u16, - base : u32, + base : *[256]IDT_Entry, }; -const IDT_Register = struct +const IDT_Register = packed struct { cr2 : u32, ds : u32, @@ -50,19 +51,12 @@ const IDT_Register = struct ss : u32, }; -var IDTEntry = IDT_Entry[256] -{ - .base_low = 0, - .segment_selector = 0, - .reserved = 0, - .flags = 0, - .base_high = 0 -}; +var IDTEntry : [256]IDT_Entry = undefined; var IDTPointer = IDT_Pointer { .limit = 0, - .base = 0, + .base = undefined, }; var error_messages = [_][] const u8 @@ -101,24 +95,31 @@ var error_messages = [_][] const u8 "Reserved" }; -pub fn IDT_flush(t : u32) u32 +pub fn IDT_flush(t : u32) u16 { - asm volatile + asm volatile ( - \\ movl %[t], %%eax \\ lidt (%%eax) \\ sti - : [ret] "={eax}" (-> u32) - : [t] "%[t]" (t) + : + : [t] "{eax}" (t) : "memory" ); + return (0); } -pub fn IDT_init() void +pub fn IDT_Init() void { + for (0..256) |i| + { + IDTEntry[i].base_low = 0; + IDTEntry[i].segment_selector = 0; + IDTEntry[i].reserved = 0; + IDTEntry[i].flags = 0; + IDTEntry[i].base_high = 0; + } IDTPointer.limit = @sizeOf(IDT_Entry) * 256 - 1; - IDTPointer.base = @as(u32, &IDTEntry); - @memset(IDT_Entry, 0); + IDTPointer.base = &IDTEntry; // init "master" chip (commands : 0x20 data : 0x21) and "slave" chip (commands : 0xA0 data : 0xA1) outPortB(0x20, 0x11); @@ -136,71 +137,71 @@ pub fn IDT_init() void outPortB(0x21, 0x0); outPortB(0xA1, 0x0); - IDT_setGate(0, &isr0, 0x08, 0x8E); - IDT_setGate(1, &isr1, 0x08, 0x8E); - IDT_setGate(2, &isr2, 0x08, 0x8E); - IDT_setGate(3, &isr3, 0x08, 0x8E); - IDT_setGate(4, &isr4, 0x08, 0x8E); - IDT_setGate(5, &isr5, 0x08, 0x8E); - IDT_setGate(6, &isr6, 0x08, 0x8E); - IDT_setGate(7, &isr7, 0x08, 0x8E); - IDT_setGate(8, &isr8, 0x08, 0x8E); - IDT_setGate(9, &isr9, 0x08, 0x8E); - IDT_setGate(10, &isr10, 0x08, 0x8E); - IDT_setGate(11, &isr11, 0x08, 0x8E); - IDT_setGate(12, &isr12, 0x08, 0x8E); - IDT_setGate(13, &isr13, 0x08, 0x8E); - IDT_setGate(14, &isr14, 0x08, 0x8E); - IDT_setGate(15, &isr15, 0x08, 0x8E); - IDT_setGate(16, &isr16, 0x08, 0x8E); - IDT_setGate(17, &isr17, 0x08, 0x8E); - IDT_setGate(18, &isr18, 0x08, 0x8E); - IDT_setGate(19, &isr19, 0x08, 0x8E); - IDT_setGate(20, &isr20, 0x08, 0x8E); - IDT_setGate(21, &isr21, 0x08, 0x8E); - IDT_setGate(22, &isr22, 0x08, 0x8E); - IDT_setGate(23, &isr23, 0x08, 0x8E); - IDT_setGate(24, &isr24, 0x08, 0x8E); - IDT_setGate(25, &isr25, 0x08, 0x8E); - IDT_setGate(26, &isr26, 0x08, 0x8E); - IDT_setGate(27, &isr27, 0x08, 0x8E); - IDT_setGate(28, &isr28, 0x08, 0x8E); - IDT_setGate(29, &isr29, 0x08, 0x8E); - IDT_setGate(30, &isr30, 0x08, 0x8E); - IDT_setGate(31, &isr31, 0x08, 0x8E); - - IDT_setGate(32, &isr32, 0x07, 0x8E); - IDT_setGate(33, &isr33, 0x07, 0x8E); - IDT_setGate(34, &isr34, 0x07, 0x8E); - IDT_setGate(35, &isr35, 0x07, 0x8E); - IDT_setGate(36, &isr36, 0x07, 0x8E); - IDT_setGate(37, &isr37, 0x07, 0x8E); - IDT_setGate(38, &isr38, 0x07, 0x8E); - IDT_setGate(39, &isr39, 0x07, 0x8E); - IDT_setGate(40, &isr40, 0x07, 0x8E); - IDT_setGate(41, &isr41, 0x07, 0x8E); - IDT_setGate(42, &isr42, 0x07, 0x8E); - IDT_setGate(43, &isr43, 0x07, 0x8E); - IDT_setGate(44, &isr44, 0x07, 0x8E); - IDT_setGate(45, &isr45, 0x07, 0x8E); - IDT_setGate(46, &isr46, 0x07, 0x8E); - IDT_setGate(47, &isr47, 0x07, 0x8E); - - IDT_setGate(128, isr128, 0x08, 0x8E); - IDT_setGate(177, isr177, 0x08, 0x8E); - - IDT_flush(&IDTPointer); + IDT_setGate(0, @intFromPtr(&isr0), 0x08, 0x8E); + IDT_setGate(1, @intFromPtr(&isr1), 0x08, 0x8E); + IDT_setGate(2, @intFromPtr(&isr2), 0x08, 0x8E); + IDT_setGate(3, @intFromPtr(&isr3), 0x08, 0x8E); + IDT_setGate(4, @intFromPtr(&isr4), 0x08, 0x8E); + IDT_setGate(5, @intFromPtr(&isr5), 0x08, 0x8E); + IDT_setGate(6, @intFromPtr(&isr6), 0x08, 0x8E); + IDT_setGate(7, @intFromPtr(&isr7), 0x08, 0x8E); + IDT_setGate(8, @intFromPtr(&isr8), 0x08, 0x8E); + IDT_setGate(9, @intFromPtr(&isr9), 0x08, 0x8E); + IDT_setGate(10, @intFromPtr(&isr10), 0x08, 0x8E); + IDT_setGate(11, @intFromPtr(&isr11), 0x08, 0x8E); + IDT_setGate(12, @intFromPtr(&isr12), 0x08, 0x8E); + IDT_setGate(13, @intFromPtr(&isr13), 0x08, 0x8E); + IDT_setGate(14, @intFromPtr(&isr14), 0x08, 0x8E); + IDT_setGate(15, @intFromPtr(&isr15), 0x08, 0x8E); + IDT_setGate(16, @intFromPtr(&isr16), 0x08, 0x8E); + IDT_setGate(17, @intFromPtr(&isr17), 0x08, 0x8E); + IDT_setGate(18, @intFromPtr(&isr18), 0x08, 0x8E); + IDT_setGate(19, @intFromPtr(&isr19), 0x08, 0x8E); + IDT_setGate(20, @intFromPtr(&isr20), 0x08, 0x8E); + IDT_setGate(21, @intFromPtr(&isr21), 0x08, 0x8E); + IDT_setGate(22, @intFromPtr(&isr22), 0x08, 0x8E); + IDT_setGate(23, @intFromPtr(&isr23), 0x08, 0x8E); + IDT_setGate(24, @intFromPtr(&isr24), 0x08, 0x8E); + IDT_setGate(25, @intFromPtr(&isr25), 0x08, 0x8E); + IDT_setGate(26, @intFromPtr(&isr26), 0x08, 0x8E); + IDT_setGate(27, @intFromPtr(&isr27), 0x08, 0x8E); + IDT_setGate(28, @intFromPtr(&isr28), 0x08, 0x8E); + IDT_setGate(29, @intFromPtr(&isr29), 0x08, 0x8E); + IDT_setGate(30, @intFromPtr(&isr30), 0x08, 0x8E); + IDT_setGate(31, @intFromPtr(&isr31), 0x08, 0x8E); + + IDT_setGate(32, @intFromPtr(&isr32), 0x08, 0x8E); + IDT_setGate(33, @intFromPtr(&isr33), 0x08, 0x8E); + IDT_setGate(34, @intFromPtr(&isr34), 0x08, 0x8E); + IDT_setGate(35, @intFromPtr(&isr35), 0x08, 0x8E); + IDT_setGate(36, @intFromPtr(&isr36), 0x08, 0x8E); + IDT_setGate(37, @intFromPtr(&isr37), 0x08, 0x8E); + IDT_setGate(38, @intFromPtr(&isr38), 0x08, 0x8E); + IDT_setGate(39, @intFromPtr(&isr39), 0x08, 0x8E); + IDT_setGate(40, @intFromPtr(&isr40), 0x08, 0x8E); + IDT_setGate(41, @intFromPtr(&isr41), 0x08, 0x8E); + IDT_setGate(42, @intFromPtr(&isr42), 0x08, 0x8E); + IDT_setGate(43, @intFromPtr(&isr43), 0x08, 0x8E); + IDT_setGate(44, @intFromPtr(&isr44), 0x08, 0x8E); + IDT_setGate(45, @intFromPtr(&isr45), 0x08, 0x8E); + IDT_setGate(46, @intFromPtr(&isr46), 0x08, 0x8E); + IDT_setGate(47, @intFromPtr(&isr47), 0x08, 0x8E); + + IDT_setGate(128, @intFromPtr(&isr128), 0x08, 0x8E); + IDT_setGate(177, @intFromPtr(&isr177), 0x08, 0x8E); + + _ = IDT_flush(@intFromPtr(&IDTPointer)); } pub fn outPortB(port : u16, value : u8) void { asm volatile ( - \\ movl %[port], %%eax - \\ movb %[value], %%al + \\ movl %%ecx, %%eax + \\ movb %%dl, %%al \\ outb %%al, %%dx : - : [port] "%[port]" (port), - [value] "%[value]" (value) + : [port] "{ecx}" (port), + [value] "{edx}" (value) : "memory" ); } @@ -208,40 +209,39 @@ export fn isr_handler(regs : *IDT_Register) void { if (regs.int_nb < 32) { - //out.kputs(error_messages[regs.int_nb]); // todo: put kernel panic + kpanic(error_messages[regs.int_nb]); } } -fn isr_common_stub() void -{ - comptime { - asm volatile ( - \\pusha - \\mov eax,ds - \\push eax - - \\mov ax, 0x10 - \\mov ds, ax - \\mov es, ax - \\mov fs, ax - \\mov gs, ax - \\push esp - \\call isr_handler - - \\add esp, 8 - \\pop ebx - \\mov ds, bx - \\mov es, bx - \\mov fs, bx - \\mov gs, bx - - \\popa - \\add esp, 8 - \\sti - \\iret +comptime { + asm ( + \\isr_common_stub: + \\pusha + \\mov %eax, %ds + \\push %eax + + \\mov %ax, 0x10 + \\mov %ds, %ax + \\mov %es, %ax + \\mov %fs, %ax + \\mov %gs, %ax + + \\push %esp + \\call isr_handler + + \\add %esp, 8 + \\pop %ebx + \\mov %ds, %bx + \\mov %es, %bx + \\mov %fs, %bx + \\mov %gs, %bx + + \\popa + \\add %esp, 8 + \\sti + \\iret ); - } } comptime { @@ -252,7 +252,8 @@ comptime { \\.global isr\i \\isr\i: - \\.if (\i != 8 && !(\i >= 10 && \i <= 14) && \i != 17) + \\cli + \\.if (\i != 8 && !(\i >= 10 && \i <= 14)) \\ push $0 \\.endif \\push $\i @@ -313,69 +314,11 @@ comptime { ); } -fn irq_common_stub() void -{ - comptime { - asm volatile ( - \\pusha - \\mov eax,ds - \\push eax - \\mov eax, cr2 - \\push eax - - \\mov ax, 0x10 - \\mov ds, ax - \\mov es, ax - \\mov fs, ax - \\mov gs, ax - - \\push esp - \\call irq_handler - - \\add esp, 8 - \\pop ebx - \\mov ds, bx - \\mov es, bx - \\mov fs, bx - \\mov gs, bx - - \\popa - \\add esp, 8 - \\sti - \\iret - ); - } -} - -var irq_routines : [32]?*const fn(*IDT_Register) void = undefined; - -fn irq_install_handler(irq : i32, handler : fn(u32) i32) void -{ - irq_routines[irq] = handler; -} - -fn irq_uninstall_handler(irq : i32) void -{ - irq_routines[irq] = 0; -} - -export fn irq_handler(regs : *IDT_Register) void -{ - const handler = irq_routines[regs.int_nb - 32]; - - if (handler) |func| - { - func(regs); - } - if (regs.int_nb >= 40) - outPortB(0x0A, 0x20); - - outPortB(0x20, 0x20); -} pub fn IDT_setGate(num : u8, base : u32, segment_selector : u16, flags : u8) void { - IDTEntry[num].base_low = base & 0xFFFF; - IDTEntry[num].base_high = (base >> 16) & 0xFFFF; + IDTEntry[num].base_low = @truncate(base); + IDTEntry[num].base_high = @truncate(base >> 16); + IDTEntry[num].reserved = 0; IDTEntry[num].segment_selector = segment_selector; IDTEntry[num].flags = flags | 0x60; } \ No newline at end of file diff --git a/sources/kernel/kmain.zig b/sources/kernel/kmain.zig index 9890c8f..7562928 100644 --- a/sources/kernel/kmain.zig +++ b/sources/kernel/kmain.zig @@ -19,14 +19,17 @@ pub const logs = @import("log.zig"); pub const kpanic = @import("panic.zig").kpanic; pub const console = @import("io/out.zig"); // pub const ports = @import("ports/ports.zig"); -// pub const int = @import("interrupts/int.zig"); +pub const idt = @import("interrupts/idt.zig"); +pub const gdt = @import("interrupts/gdt.zig"); export fn kmain() void { @setCold(true); + // int.init(); drivers.initDrivers(); + gdt.GDT_Init(); + idt.IDT_Init(); console.kputs("Welcome to RatiOS ! (just to respect the kfs-1 subject : 42)"); - kpanic("test"); drivers.shutdownDrivers(); }