From: Rhett <rhett.aultman@meraki.net>
Date: Sun, 1 Sep 2013 22:55:17 +0000 (-0700)
Subject: Stubs for a simple system call
X-Git-Url: https://git.kitaultman.com/?a=commitdiff_plain;h=1f47d663bdb5edc9a8008dd18b4bf71422a83489;p=arcanos.git

Stubs for a simple system call
---

diff --git a/inc/idt.h b/inc/idt.h
index 8ce5c51..0bd66b2 100644
--- a/inc/idt.h
+++ b/inc/idt.h
@@ -26,6 +26,8 @@ IDT* phys_idtp;
 #define HIGH_OFFSET(x) ((x >> 16))
 #define LOW_OFFSET(x) ((x & 0x0000FFFF)) 
 
+#define SYSCALL_IRQ 0x80
+
 void reset_idt();
 void set_idt_entry(uint8_t number, void (*handler)(), uint16_t type);
 void load_idt();
diff --git a/kern/init.c b/kern/init.c
index 52ba583..8f41e58 100644
--- a/kern/init.c
+++ b/kern/init.c
@@ -13,6 +13,7 @@
 #define CHECK_FLAG(flags,bit)   ((flags) & (1 << (bit)))
 
 extern void keyboard_isr();
+extern void syscall_isr();
 extern void load_partitions();
 void i386_init(multiboot_info_t* mbi);
 
@@ -133,6 +134,7 @@ i386_init(multiboot_info_t* mbi)
 	PIC_remap(32, 40); //PIC1 - 32-39, PIC2 - 40-47;
 	set_idt_entry(33, keyboard_isr, INTERRUPT_GATE_TYPE_ATTR);
 	PIC_set_mask(1, 0);
+	set_idt_entry(SYSCALL_IRQ, syscall_isr, INTERRUPT_GATE_TYPE_ATTR);
 	load_idt();
 	asm("sti"); //Interrupts are on now, bitches.
 	_kern_print("Interrupts enabled.\n");
diff --git a/kern/interrupts/interrupt_handlers.c b/kern/interrupts/interrupt_handlers.c
index d9cffaa..5481b5e 100644
--- a/kern/interrupts/interrupt_handlers.c
+++ b/kern/interrupts/interrupt_handlers.c
@@ -75,6 +75,11 @@ void _interrupt_handler(uint8_t number)
 	while(1);
 }
 
+void _syscall_interrupt()
+{
+    _kern_print("System call interrupt has been called\n");
+}
+
 void _keyboard_interrupt()
 {
     uint8_t new_scan_code=0;
diff --git a/kern/interrupts/interrupts.S b/kern/interrupts/interrupts.S
index fc5c990..93dc10e 100644
--- a/kern/interrupts/interrupts.S
+++ b/kern/interrupts/interrupts.S
@@ -186,6 +186,13 @@ isr_30:
     popal
     iret
 
+.globl syscall_isr
+syscall_isr:
+	pushal
+	call _syscall_interrupt
+	popal
+	iret
+
 .globl keyboard_isr
 keyboard_isr:
 	pushal