Add yield syscall (Not working in umode)

cpu/i386/isr.c

@@ -3,6 +3,7 @@
 #include "ports.h"
 #include "../halt.h"
 #include "../drivers/vga.h"
+#include "../tasking.h"
 #include <string.h>
 #include <stdint.h>
 void irq_handler(registers_t r);
@@ -163,6 +164,11 @@ void isr_handler(registers_t r) {
       // }
       halt();
       break;
+    case 80:
+      if (r.eax==1) {
+        tasking_yield();
+      }
+    break;
     }
   }
 }

cpu/i386/tasking.c

@@ -16,11 +16,11 @@ static Task* headTask;
 void tasking_init() {
   currentTask=NULL;
   next_pid=0;
-  headTask=createTask(NULL);
+  headTask=tasking_createTask(NULL);
   currentTask=headTask;
 }
 
-Task* createTaskEax(void* eip,uint32_t eax) {
+Task* tasking_createTaskEax(void* eip,uint32_t eax) {
     Task* task=malloc(sizeof(Task));
     task->regs.eax=eax;
     task->regs.ebx=0;
@@ -45,11 +45,11 @@ Task* createTaskEax(void* eip,uint32_t eax) {
     return task;
 }
 
-Task* createTask(void* eip) {
-  return createTaskEax(eip,0);
+Task* tasking_createTask(void* eip) {
+  return tasking_createTaskEax(eip,0);
 }
 
-void send_msg(uint32_t pid,char* msg) {
+void tasking_send_msg(uint32_t pid,char* msg) {
   for (Task* task=headTask;task!=NULL;task=task->next) {
     if (task->pid==pid) {
       if (task->msg_store==NULL) {
@@ -66,7 +66,7 @@ void send_msg(uint32_t pid,char* msg) {
   }
 }
 
-char* get_msg(uint32_t* sender) {
+char* tasking_get_msg(uint32_t* sender) {
   if (!currentTask->msg_store) {
     return NULL;
   }
@@ -88,7 +88,7 @@ char* get_msg(uint32_t* sender) {
   return data;
 }
 
-void yield() {
+void tasking_yield() {
     Task* task=currentTask->next;
     if (!task) {
       task=headTask;

cpu/tasking.h

@@ -1,10 +1,10 @@
-#ifndef TASKING_H
-#define TASKING_H
+#ifndef CPU_TASKING_H
+#define CPU_TASKING_H
 #include "i386/tasking.h"
 
 void tasking_init();
-void yield();
-Task* createTask(void* eip);
-void send_msg(uint32_t pid,char* msg);
-char* get_msg(uint32_t* sender);
+void tasking_yield();
+Task* tasking_createTask(void* eip);
+void tasking_send_msg(uint32_t pid,char* msg);
+char* tasking_get_msg(uint32_t* sender);
 #endif

kernel/kernel.c

@@ -4,6 +4,7 @@
 #include "../drivers/vga.h"
 #include <grub/text_fb_info.h>
 #include <stdlib.h>
+#include <tasking.h>
 #include "multiboot.h"
 
 void task() {
@@ -56,7 +57,7 @@ void kmain(multiboot_info_t* header) {
   port_byte_out(0xe9,'!');
   port_byte_out(0xe9,'\n');
   vga_write_string("Task create\n");
-  createTask(task);
+  tasking_createTask(task);
   vga_write_string("Task switch\n");
   yield();
   vga_write_string("Back in main\n");

libc/tasking.c

@@ -0,0 +1,6 @@
+void yield() {
+  asm volatile("  \
+    mov $1, %eax; \
+    int $80; \
+  ");
+}

libc/tasking.h

@@ -0,0 +1,6 @@
+#ifndef TASKING_H
+#define TASKING_H
+
+void yield();
+
+#endif