simple mm maping virtual to physic

include/call_user.h

+
+__attribute__((fastcall)) void call_user(void (*user_fct)(), void *user_stack);
+

link.ld

@@ -3,6 +3,10 @@ ENTRY(start)
 phys = 0x00100000;
 SECTIONS
 {
+	.user 0x00400000 :
+	{
+		src/user.o (.text* .data .rodata .bss)
+	}
 	.text phys : AT(phys)
 	{
 		code = .; _code = .; __code = .;

src/call_user.s

+global call_user
+
+call_user:
+	mov ax, 0x28
+	ltr ax
+	
+	mov ax, 0x23
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	push 0x23
+	push edx ; second arg of call_user stack
+	pushf
+	push 0x1B
+	push ecx ; first arg of call_user fct
+	iret
+

src/main.c

 #include "gdt.h"
 #include "idt.h"
 #include "minilib.h"
+#include "mmu.h"
+#include "call_user.h"
 
+extern void user_entry();
 void empty_irq(int_regs_t *r)
 {
 }
+extern char user_stack[];
 
+void page_fault_handler(int_regs_t *r)
+{
+    puts("page call\n");
+    for(;;);
+}
+
+void sys_handler(int_regs_t *r)
+{
+}
 /* multiboot entry-point with datastructure as arg. */
 void main(unsigned int * mboot_info)
 {
@@ -24,10 +37,13 @@ void main(unsigned int * mboot_info)
 
     idt_setup_int_handler(0, empty_irq);
     idt_setup_int_handler(1, empty_irq);
-
+    idt_setup_int_handler(14, page_fault_handler);
     __asm volatile("sti");
 
     /* minimal setup done ! */
+    setup_mmu();
+    call_user(user_entry, user_stack);
+
 
     puts("Going idle\n");
     for(;;) ; /* nothing more to do... really nothing ! */

src/user.c

 char user_stack[65536];
 
-static void putc(int c) {
-	asm("movl $1, %%eax" "\n\t" "movl %0, %%edi" "\n\t" "int $87" : : "r"(c) : "eax", "edi");
-}
+// static void putc(int c) {
+// 	asm("movl $1, %%eax" "\n\t" "movl %0, %%edi" "\n\t" "int $87" : : "r"(c) : "eax", "edi");
+// }
 
-static void puts(char *s) {
-	int i;
-	for (i = 0; s[i] != 0; i++) {
-		putc(s[i]);
-	}
-}
+// static void puts(char *s) {
+// 	int i;
+// 	for (i = 0; s[i] != 0; i++) {
+// 		putc(s[i]);
+// 	}
+// }
 
+int variable = 200;
 void user_entry() {
-	puts("Hello from userland\n"); 
+	//puts("Hello from userland\n"); 
 
 	char *ptr = (char*) 0x800000;
 	*ptr = 42;
-	puts("Write succeeded!\n");
+	//puts("Write succeeded!\n");
 	for(;;);
 }