cef0a71bce
They're never actually going to change independently, and it's also brining in kutil headers more places than they should be.
97 lines
1.9 KiB
C++
97 lines
1.9 KiB
C++
#include "console.h"
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#include "cpu.h"
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#include "debug.h"
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#include "msr.h"
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#include "process.h"
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#include "scheduler.h"
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#include "syscall.h"
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extern "C" {
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void _halt();
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void syscall_handler_prelude();
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}
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void
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syscall_enable()
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{
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// IA32_EFER - set bit 0, syscall enable
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uint64_t efer = rdmsr(msr::ia32_efer);
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wrmsr(msr::ia32_efer, efer|1);
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// IA32_STAR - high 32 bits contain k+u CS
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// Kernel CS: GDT[1] ring 0 bits[47:32]
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// User CS: GDT[3] ring 3 bits[63:48]
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uint64_t star =
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(((1ull << 3) | 0) << 32) |
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(((3ull << 3) | 3) << 48);
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wrmsr(msr::ia32_star, star);
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// IA32_LSTAR - RIP for syscall
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wrmsr(msr::ia32_lstar,
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reinterpret_cast<uintptr_t>(&syscall_handler_prelude));
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// IA32_FMASK - FLAGS mask inside syscall
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wrmsr(msr::ia32_fmask, 0x200);
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}
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uintptr_t
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syscall_dispatch(uintptr_t return_rsp, const cpu_state ®s)
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{
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console *cons = console::get();
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syscall call = static_cast<syscall>(regs.rax);
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switch (call) {
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case syscall::noop:
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break;
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case syscall::debug:
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cons->set_color(11);
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cons->printf("\nReceived DEBUG syscall\n");
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cons->set_color();
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print_regs(regs);
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break;
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case syscall::message:
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cons->set_color(11);
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cons->printf("\nReceived MESSAGE syscall\n");
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cons->set_color();
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break;
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case syscall::pause:
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{
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cons->set_color(11);
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auto &s = scheduler::get();
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auto *p = s.current();
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p->wait_on_signal(-1ull);
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cons->printf("\nReceived PAUSE syscall\n");
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return_rsp = s.tick(return_rsp);
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cons->set_color();
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}
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break;
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case syscall::sleep:
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{
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cons->set_color(11);
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auto &s = scheduler::get();
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auto *p = s.current();
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p->wait_on_time(regs.rbx);
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cons->printf("\nReceived SLEEP syscall\n");
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return_rsp = s.tick(return_rsp);
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cons->set_color();
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}
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break;
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default:
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cons->set_color(9);
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cons->printf("\nReceived unknown syscall: %02x\n", call);
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cons->set_color();
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_halt();
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break;
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}
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return return_rsp;
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}
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