From 1f47d663bdb5edc9a8008dd18b4bf71422a83489 Mon Sep 17 00:00:00 2001
From: Rhett <rhett.aultman@meraki.net>
Date: Sun, 1 Sep 2013 15:55:17 -0700
Subject: [PATCH] Stubs for a simple system call
---
inc/idt.h | 2 ++
kern/init.c | 2 ++
kern/interrupts/interrupt_handlers.c | 5 +++++
kern/interrupts/interrupts.S | 7 +++++++
4 files changed, 16 insertions(+)
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
--
2.34.1