Gabriel
930f69c498
This defeated the point of passing the page tables to init, since rsi would be set to zero anyway.
76 lines
2.0 KiB
Zig
76 lines
2.0 KiB
Zig
const std = @import("std");
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const interrupts = @import("interrupts.zig");
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pub inline fn enterTask(regs: *interrupts.InterruptStackFrame, comptime base: u64, directory: u64) noreturn {
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asm volatile (
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\\ addq %[base], %rsp
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\\ push %[ss]
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\\ push %[rsp]
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\\ push %[rflags]
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\\ push %[cs]
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\\ push %[rip]
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\\ mov %[directory], %cr3
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\\ mov $0, %rax
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\\ mov $0, %rbx
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\\ mov $0, %rcx
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\\ mov $0, %rdx
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\\ mov $0, %rbp
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\\ mov $0, %r8
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\\ mov $0, %r9
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\\ mov $0, %r10
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\\ mov $0, %r11
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\\ mov $0, %r12
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\\ mov $0, %r13
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\\ mov $0, %r14
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\\ mov $0, %r15
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\\ iretq
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:
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: [ss] "r" (regs.ss),
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[rsp] "r" (regs.rsp),
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[rflags] "r" (regs.rflags),
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[cs] "r" (regs.cs),
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[rip] "r" (regs.rip),
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[arg0] "{rdi}" (regs.rdi),
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[arg1] "{rsi}" (regs.rsi),
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[base] "r" (base),
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[directory] "r" (directory),
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);
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unreachable;
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}
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pub fn idleLoop() callconv(.Naked) noreturn {
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asm volatile (
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\\.loop:
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\\ sti
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\\ hlt
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\\ jmp .loop
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);
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}
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pub fn setAddress(regs: *interrupts.InterruptStackFrame, address: u64) void {
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regs.rip = address;
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}
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pub fn setArguments(regs: *interrupts.InterruptStackFrame, arg0: u64, arg1: u64) void {
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regs.rdi = arg0;
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regs.rsi = arg1;
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}
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pub fn setStack(regs: *interrupts.InterruptStackFrame, stack: u64) void {
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regs.rsp = stack;
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}
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pub fn initKernelRegisters(regs: *interrupts.InterruptStackFrame) void {
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regs.* = std.mem.zeroes(interrupts.InterruptStackFrame);
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regs.cs = 0x08;
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regs.ss = 0x10;
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regs.rflags = 1 << 9; // IF (Interrupt enable flag)
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}
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pub fn initUserRegisters(regs: *interrupts.InterruptStackFrame) void {
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regs.* = std.mem.zeroes(interrupts.InterruptStackFrame);
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regs.cs = 0x18 | 3;
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regs.ss = 0x20 | 3;
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regs.rflags = 1 << 9; // IF (Interrupt enable flag)
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}
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