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Implement syscalls, hello world from userspace

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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
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43
kernel/hal/x86_64/syscall.c Normal file
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#include <stdint.h>
#include "syscall.h"
#include "cpu.h"
#include "intr.h"
#include "syscall/syscall.h"
#include "proc/proc.h"
#include "kprintf.h"
#include "errors.h"
extern void hal_enable_syscallentry(void);
extern void hal_syscallentry(void);
void hal_syscalldispatch(IntrStackFrame *frame) {
uint64_t sysnum = frame->regs.rax;
if (sysnum < SYSCALLS_MAX) {
SyscallFn fn = SYSCALL_TABLE[sysnum];
if (fn == NULL) {
frame->regs.rax = E_BADSYSCALL;
return;
}
int32_t ret = fn(frame->regs.rdi, frame->regs.rsi, frame->regs.rdx,
frame->regs.r10, frame->regs.r8, frame->regs.r9);
if (sysnum == SYS_QUITPROC) {
proc_sched((void *)frame);
}
frame->regs.rax = *(uint64_t *)&ret;
}
}
void hal_syscall_init(void) {
hal_cpu_init(0);
LocalCpuData *lcd = &HAL_CPUS[0];
hal_cpu_wrmsr(HAL_CPU_EFER, hal_cpu_rdmsr(HAL_CPU_EFER) | 0x1);
hal_enable_syscallentry();
hal_cpu_wrmsr(HAL_CPU_GSBASE, (uint64_t)lcd);
hal_cpu_wrmsr(HAL_CPU_KGSBASE, (uint64_t)lcd);
hal_cpu_wrmsr(HAL_CPU_SFMASK, (uint64_t)0);
hal_cpu_wrmsr(HAL_CPU_LSTAR, (uint64_t)&hal_syscallentry);
}