49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
#include <stdint.h>
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#include "interrupts.h"
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#include "keyboard.h"
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#include "sys.h"
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#include "syscall.h"
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#include "tty.h"
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#include "timer.h"
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#include "rtc.h"
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#define NB_SYSCALL 3
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void *syscalls[NB_SYSCALL] = {
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keyboard_getchar,
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get_rtc_time,
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sys_halt};
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void syscall_handler(Stack *registers)
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{
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int sys_index = registers->eax;
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if (sys_index >= NB_SYSCALL)
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return;
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void *function = syscalls[sys_index];
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int ret;
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asm volatile(" push %1; \
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push %2; \
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push %3; \
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push %4; \
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push %5; \
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call *%6; \
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pop %%ebx; \
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pop %%ebx; \
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pop %%ebx; \
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pop %%ebx; \
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pop %%ebx; \
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" : "=a"(ret) : "r"(registers->edi), "r"(registers->esi),
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"r"(registers->edx), "r"(registers->ecx),
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"r"(registers->ebx), "r"(function));
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registers->eax = ret;
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}
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void syscall_init(void)
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{
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isr_install_handler(128, syscall_handler);
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} |