M kernel/main.c → kernel/main.c

@@ -122,6 +122,8 @@
 int sysinit(void) {
     uint8_t scancode = 0;
 
+    syscall(1, 0xCAFEBABE, 0xDEADBEEF, 0x42069420);
+
     printk("PRESS ENTER\n");
 
     while (scancode != 0x1C) {

M kernel/syscall.c → kernel/syscall.c

@@ -1,13 +1,18 @@
 #include "cedos/interrupts.h"
+#include "cedos/core.h"
 
-INTERRUPT(syscall_interrupt, frame) {
-    printk("SYSCALL\n");
+void test(uint32_t ebx, uint32_t ecx, uint32_t edx) {
+    printk("SYSCALL 0x01: EBX=%X ECX=%X EDX=%X\n", ebx, ecx, edx);
 }
 
+void* SYSCALL_TABLE[] = { hard_reset, test };
+
+extern void syscall_interrupt(void);
+
 /*!
  * Installs the syscall interrupt to INT 0x30
  */
 int syscall_init(void) {
-    install_interrupt(0x30, syscall_interrupt, 0x08, INT_GATE);
+    install_interrupt(0x30, &syscall_interrupt, 0x08, INT_GATE);
     return 1;
 }

A kernel/syscall.s

@@ -0,0 +1,18 @@
+.global syscall_interrupt
+/*!
+ * Prehandles scheduler interrupts by switching from process- to scheduler-stack
+ */
+syscall_interrupt:
+  // push arguments on stack
+  push %edx
+  push %ecx
+  push %ebx
+
+  mov $SYSCALL_TABLE, %ecx
+  mov (%ecx, %eax, 4), %eax
+
+  call %eax
+
+  // restore stack
+  add $12, %esp
+  iret