dead@root

syscall.c

@@ -0,0 +1,47 @@
+#include <stdint.h>
+
+#include "interrupts.h"
+#include "keyboard.h"
+#include "sys.h"
+#include "syscall.h"
+#include "tty.h"
+#include "timer.h"
+
+#define NB_SYSCALL 2
+
+void *syscalls[NB_SYSCALL] = {
+    keyboard_getchar,
+
+    sys_halt};
+
+void syscall_handler(Stack *registers)
+{
+    int sys_index = registers->eax;
+
+    if (sys_index >= NB_SYSCALL)
+        return;
+
+    void *function = syscalls[sys_index];
+
+    int ret;
+    asm volatile("   push %1;   \
+                     push %2;   \
+                     push %3;   \
+                     push %4;   \
+                     push %5;   \
+                     call *%6;  \
+                     pop %%ebx; \
+                     pop %%ebx; \
+                     pop %%ebx; \
+                     pop %%ebx; \
+                     pop %%ebx; \
+                     " : "=a"(ret) : "r"(registers->edi), "r"(registers->esi),
+                                     "r"(registers->edx), "r"(registers->ecx),
+                                     "r"(registers->ebx), "r"(function));
+    registers->eax = ret;
+}
+
+void syscall_init(void)
+{
+    isr_install_handler(128, syscall_handler);
+}