RockOS/kernel/syscall.c

#include <stdint.h>

#include "scheduler.h"

typedef struct registers {
    uint32_t gs, fs, es, ds;                           // Pushed manually
    uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;   // Pushed by pusha
    uint32_t int_no, err_code;                         // Pushed manually
    uint32_t eip, cs, eflags, useresp, ss;             // Pushed automatically by CPU
} registers_t;

int32_t sys_exit();
int32_t sys_read();
int32_t sys_write();
int32_t sys_open();
int32_t sys_close();
int32_t sys_brk();

int32_t syscall(registers_t* regs) {
    switch(regs->eax) {
        case 1: return sys_exit();
        case 3: return sys_read();
        case 4: return sys_write();
        case 5: return sys_open();
        case 6: return sys_close();
        case 12: return sys_brk();
        default:
            return -1;
    }
}

int32_t sys_exit() {
    exit();
    return 0;
}

int32_t sys_read() {
    return 0;
}

int32_t sys_write() {
    return 0;
}