kamkow1/my-os-project2
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Implement syscalls, hello world from userspace

Browse Source
This commit is contained in:
Kamil Kowalczyk
2025-09-02 23:51:14 +02:00
parent 920de10025
commit 8a12f23b69
24 changed files with 313 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
kernel/hal/x86_64/cpu.c
View File

@ -1,14 +1,28 @@
#include <stdint.h>
#include <stddef.h>
#include "cpu.h"
#include "vmm.h"
#include "pmm/pmm.h"
#include "hal/hal.h"
#include "bootinfo/bootinfo.h"
LocalCpuData HAL_CPUS[HAL_CPUS_MAX];
uint64_t hal_cpu_rdmsr(uint32_t id) {
uint32_t lo, hi;
asm volatile("rdmsr" : "=m"(lo), "=d"(hi) : "c"(id));
asm volatile("rdmsr" : "=a"(lo), "=d"(hi) : "c"(id));
return ((uint64_t)lo) | ((uint64_t)hi << 32);
}
uint64_t hal_cpu_wrmsr(uint32_t id, uint64_t val) {
uint32_t lo = val & 0xffffffff, hi = (val >> 32) & 0xffffffff;
asm volatile("wrmsr" :: "a"(lo), "d"(hi), "c"(id) : "memory");
uint32_t lo = val & 0xFFFFFFFF;
uint32_t hi = val >> 32;
asm volatile("wrmsr" :: "c"(id), "a"(lo), "d"(hi));
return val;
}
void hal_cpu_init(uint32_t cpu) {
void *addr = pmm_alloc(16) + (16 * HAL_PAGE_SIZE);
HAL_CPUS[cpu].syscall_kstack = (uint64_t *)VIRT(addr);
HAL_CPUS[cpu].kcr3 = hal_vmm_current_cr3();
}