mirror of
https://github.com/Mathewnd/Astral.git
synced 2026-11-01 06:58:22 +00:00
Matheus
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#include <arch/cpu.h>
|
|
#include <arch/msr.h>
|
|
#include <cpuid.h>
|
|
#include <arch/cls.h>
|
|
#include <stdio.h>
|
|
#include <kernel/pmm.h>
|
|
#include <arch/idt.h>
|
|
|
|
// initializes things like
|
|
// syscall, sse, etc
|
|
// for the current cpu
|
|
|
|
extern void asm_syscall_entry();
|
|
|
|
void cpu_state_init(){
|
|
|
|
// syscall
|
|
|
|
// does it exist
|
|
|
|
int eax,ebx,ecx,edx;
|
|
|
|
__get_cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
|
|
|
|
if(edx & (1 << 11)){ // check for the syscall bit
|
|
uint64_t efer = rdmsr(MSR_EFER);
|
|
efer |= 1; // set syscall enable bit
|
|
wrmsr(MSR_EFER, efer);
|
|
|
|
uint64_t star = 0;
|
|
star |= (uint64_t)0x28 << 48;
|
|
star |= (uint64_t)0x28 << 32;
|
|
|
|
wrmsr(MSR_STAR, star);
|
|
wrmsr(MSR_LSTAR, asm_syscall_entry);
|
|
wrmsr(MSR_CSTAR, 0); // no compat mode syscall handler
|
|
wrmsr(MSR_FMASK, 0x200); // disable interrupts on syscall
|
|
}
|
|
// undefined opcode exception will handle system calls then
|
|
else printf("CPU%lu: syscall instruction not supported\n", arch_getcls()->lapicid);
|
|
|
|
// enable SSE
|
|
|
|
asm volatile(
|
|
"mov %%cr0, %%rax;"
|
|
"and $0xFFFB, %%ax;"
|
|
"or $2, %%eax;"
|
|
"mov %%rax, %%cr0;"
|
|
"mov %%cr4, %%rax;"
|
|
"or $0b11000000000, %%rax;"
|
|
"mov %%rax, %%cr4;"
|
|
: : : "rax");
|
|
|
|
// set up interrupt stacks
|
|
|
|
// timer stack is 1
|
|
|
|
arch_getcls()->ist.ist1 = pmm_hhdmalloc(10) + PAGE_SIZE*10;
|
|
|
|
|
|
}
|