Trying again

src/PCB.c

@@ -90,4 +90,5 @@ void proc_setup()
     {
         procs[i]=NULL;
     }
+    kstack = kmalloc(4096);
 }

src/PCB.h

@@ -4,6 +4,8 @@
 #include <stdint.h>
 #include "mem.h"
 
+void* kstack;
+
 typedef struct//all regs in proc
 {
     uint32_t edi;
@@ -26,6 +28,9 @@ typedef struct//all regs in proc
 
     uint32_t trap;
     
+    uint32_t mmm;
+    uint32_t why;
+
     uint32_t err;
     
     uint32_t eip;
@@ -68,5 +73,5 @@ void syscall();
 void addproc(process* proc);
 void settf(trapframe* tf);
 void proc_setup();
-
+int yield();
 #endif

src/elf.c

@@ -83,5 +83,5 @@ void load_elf(elf_header* elf_start)
     pcb->tf->eip = (uint32_t)elf_start->program_entry_position;
 
     addproc(pcb);
-    asm("mov $3, %eax; int 0x80");
+    //asm("mov $3, %eax; int 0x80");
 }

src/idta.asm

 extern default_handler
 extern idt_ftoi
+extern kstack
 	
 %macro error_interrupt 1
 global interrupt_handler_%1
 interrupt_handler_%1:
+        push ebp
+        push esp
+        mov ebp, kstack
+        mov esp, kstack
 	push 	dword %1
 	jmp 	common_handler
 %endmacro
@@ -12,6 +17,10 @@ interrupt_handler_%1:
 global interrupt_handler_%1
 interrupt_handler_%1:
 	push 	dword 0
+        push ebp
+        push esp
+        mov ebp, kstack
+        mov esp, kstack
 	push 	dword %1
 	jmp 	common_handler
 %endmacro
@@ -29,7 +38,10 @@ common_handler:
         pop dword es
         pop dword ds
         
-	add	esp, 8
+	add	esp, 4
+        pop esp
+        pop ebp
+        add	esp, 4
 	iret
 
 regular_interrupt 0

src/kern.c

@@ -38,11 +38,11 @@ void kernel_main(multiboot_info* mbt, uint32_t magic)
     serial_writestring("IDT initialized\n");
     disable_int();
     pic_init(0x20,0x28);
-    pit_init();
+    //pit_init();
     io_init();
     proc_setup();
-    pit_start_counter(100, PIT_OCW_CONT_0, PIT_OCW_MODE_SQWVGEN);
-    enable_int();
+    //pit_start_counter(100, PIT_OCW_CONT_0, PIT_OCW_MODE_SQWVGEN);
+    //enable_int();
 
 	/* Since there is no support for newlines in terminal_putchar
          * yet, '\n' will produce some VGA specific character instead.
@@ -84,6 +84,11 @@ void kernel_main(multiboot_info* mbt, uint32_t magic)
 
     load_elf((elf_header*)&elf_hello);
     
+    pit_init();
+    pit_start_counter(100, PIT_OCW_CONT_0, PIT_OCW_MODE_SQWVGEN);
+    enable_int();
+
+
     test_idt();
     while(true)
     {

src/pit.c

@@ -18,6 +18,7 @@ void pit_irq()
     pic_command(0, PIC_OCW2_EOI);
     //serial_writestring("PIT tickn\n");
     //asm volatile("nop;nop;nop;popa; iret;");
+    yield();
 }
 
 void pit_command(uint8_t cmd)