Added sti() and cli() assembly wrappers

TODO

@@ -11,7 +11,7 @@ TODO
 [x] Paging
 [x] Serial monitor
 [x] kmalloc()
-[ ] Make dedicated asm functions like lidt(), sti(), ...
+[x] Make dedicated asm functions like lidt(), sti(), ...
 [ ] Add something like <errno.h> in the kernel
 [ ] Improve kmalloc() to reduce fragmentation
 [ ] Improve kmalloc() for better alignment
@@ -20,9 +20,10 @@ TODO
 [ ] HPET
 [ ] System calls
 [ ] Userspace
-[ ] Processes/Tasks
+[x] Processes/Tasks
-[ ] Scheduler
+[x] Scheduler
-[ ] Task switching
+[ ] Priority scheduler
+[x] Task switching
 [ ] Inter-process communication
 [ ] Graphics
 [ ] Multicore support

kernel/include/system.h

@@ -2,6 +2,8 @@
 #define _SYSTEM_H
 
 #include <kernel.h>
+#include <gdt.h>
+#include <idt.h>
 
 // cpuid
 void cpuid(uint32_t* eax, uint32_t* ebx, uint32_t* ecx, uint32_t* edx);
@@ -15,4 +17,8 @@ void     outw(uint16_t port, uint16_t data);
 uint32_t inl(uint16_t port);
 void     outl(uint16_t port, uint32_t data);
 
+// x86
+void cli(void);
+void sti(void);
+
 #endif

kernel/src/isr.c

@@ -1,6 +1,5 @@
 #include <syscall.h>
 #include <kernel.h>
-#include <string.h>
 #include <system.h>
 #include <idt.h>
 #include <isr.h>
@@ -69,7 +68,7 @@ int isr_init(void) {
 	idt_set_gate(0x80, (void*)(uint32_t)isr128, IDT_FLAG_USER);
 
 	// Let interrupts interrupt
-	__asm__ volatile ("sti");
+	sti();
 
 	debugf("[isr] ISR initialized.\n");
 	return 0;

kernel/src/system.c

@@ -42,3 +42,11 @@ void outl(uint16_t port, uint32_t data) {
 	__asm__ volatile ("outl %1, %0" :: "dN"(port), "a"(data));
 }
 
+void cli(void) {
+	__asm__ volatile ("cli");
+}
+
+void sti(void) {
+	__asm__ volatile ("sti");
+}
+

kernel/src/task.c

@@ -2,6 +2,8 @@
 #include <kernel.h>
 #include <paging.h>
 #include <string.h>
+#include <system.h>
+#include <sched.h>
 #include <gdt.h>
 #include <isr.h>
 #include <pmm.h>
@@ -31,7 +33,7 @@ int task_init(void) {
 }
 
 void task_create(size_t id, uint32_t eip, int kernel_task, uint32_t* pagedir, int argc, char** argv) {
-	__asm__ volatile ("cli"); // Make sure we don't get interrupted	
+	cli();
 
 	uint32_t kstack = (uint32_t)kmalloc(0x1000 - 16) + (0x1000 - 16);
 	uint8_t* kesp = (uint8_t*)kstack;
@@ -82,12 +84,9 @@ void task_create(size_t id, uint32_t eip, int kernel_task, uint32_t* pagedir, in
 	new->heap_start = USER_HEAP;
 	new->heap_end = USER_HEAP;
 
-	debugf("[task] NEW! Task #%d - EIP = 0x%08x, ESP = 0x%08x%s\n",
-		id, eip, kesp, kernel_task ? " (kernel)" : "");
-
 	// We don't need to setup a stack frame
 	if (kernel_task) {
-		__asm__ volatile ("sti");
+		sti();
 		return;
 	}
 
@@ -131,7 +130,7 @@ void task_create(size_t id, uint32_t eip, int kernel_task, uint32_t* pagedir, in
 }
 
 void task_kill(size_t id) {
-	__asm__ volatile ("cli");
+	cli();
 
 	struct task* current = task_first;
 	while (current != NULL) {
@@ -171,8 +170,8 @@ void task_kill(size_t id) {
 	}
 	kfree(task);
 
-	// schedule();
+	schedule();
-	__asm__ volatile ("sti");
+	sti();
 }
 
 void task_set_user_heap(struct task* task, size_t heap_end) {

kernel/src/timer.c

@@ -27,7 +27,7 @@ int pit_init(void) {
 void pit_phase(uint8_t ch, uint8_t mode, uint32_t hz) {
 	if (ch > 2 || mode > 7) return;
 	
-	__asm__ volatile ("cli");
+	cli();
 
 	outb(PIT_CMD, ((ch << 6) | (3 << 4) | (mode << 1)));
 
@@ -36,7 +36,7 @@ void pit_phase(uint8_t ch, uint8_t mode, uint32_t hz) {
 	outb(PIT_CH0 + ch, div >> 8);
 	debugf("[PIT] Set PIT divisor to %d (%d Hz).\n", div, hz);
 
-	__asm__ volatile ("sti");
+	sti();
 }
 
 void pit_handler(struct isr_int_frame* iframe) {