dead@root 2

Makefile

@@ -6,10 +6,10 @@ AS = i686-elf-as
 LD = i686-elf-gcc
 GRUB_FILE = grub-file
 GRUB_MKRESCUE = grub-mkrescue
-KERNEL = myos.bin
-ISO = myos.iso
+KERNEL = deados.bin
+ISO = deados.iso
 
-SOURCES_C = kernel.c tty.c idt.c timer.c io.c vga.c gdt.c sys.c irq.c isr.c keyboard.c shell.c string.c
+SOURCES_C = kernel.c tty.c idt.c timer.c io.c vga.c gdt.c sys.c irq.c isr.c keyboard.c shell.c string.c user_space.c syscall.c
 SOURCES_ASM = boot.s idt_load.s gdt_flush.s pit_handler.s irq_e.s isr_e.s
 OBJECTS = $(SOURCES_ASM:.s=.o) $(SOURCES_C:.c=.o)
 

grub.cfg

@@ -1,3 +1,3 @@
-menuentry "dead" {
-	multiboot /boot/myos.bin
+menuentry "deadOS" {
+	multiboot /boot/deados.bin
 }

kernel.c

@@ -9,6 +9,8 @@
 #include "interrupts.h"
 #include "keyboard.h"
 #include "shell.h"
+#include "user_space.h"
+#include "syscall.h"
 
 void kernel_main(void)
 {
@@ -35,6 +37,9 @@ void kernel_main(void)
         terminal_printc("\n");
         delay(500);
     }
+    // syscall_init();
+
+    // enter_user_space();
 
     shell_init();
 }

shell.c

@@ -13,7 +13,7 @@ void shell_init(void)
     while (true)
     {
         terminal_printc("\n");
-        terminal_printc("&7root@dead: /> ");
+        terminal_printc("&7dead@&croot&7: /> ");
 
         i = 0;
         c = 0;
@@ -106,7 +106,7 @@ void shell_parse_input(char *input)
     else
     {
         terminal_printc("Unknown command: '");
-        terminal_printc(command);
+        terminal_writestring(command);
         terminal_printc("'\n");
         terminal_printc("Type 'help' to print out the list of commands.\n");
     }

syscall.c

@@ -0,0 +1,26 @@
+#include <stdint.h>
+#include "interrupts.h"
+#include "syscall.h"
+#include "tty.h"
+
+void test_syscall()
+{
+    terminal_printc("Test syscall called\n");
+}
+
+void syscall_handler(Stack *registers)
+{
+    int sys_index = registers->eax;
+
+    if (sys_index != 0)
+    {
+        return;
+    }
+
+    test_syscall();
+}
+
+void syscall_init(void)
+{
+    isr_install_handler(128, syscall_handler);
+}

syscall.h

@@ -0,0 +1,6 @@
+#ifndef SYSCALL_H
+#define SYSCALL_H
+
+void syscall_init(void);
+
+#endif

user_space.c

@@ -0,0 +1,23 @@
+#include "user_space.h"
+
+void enter_user_space(void)
+{
+    asm volatile(" cli;              \
+                  mov $0x23, %ax;   \
+                  mov %ax, %ds;     \
+                  mov %ax, %es;     \
+                  mov %ax, %fs;     \
+                  mov %ax, %gs;     \
+                  mov %esp, %eax;   \
+                  pushl $0x23;      \
+                  pushl %eax;       \
+                  pushf;            \
+                  popl %eax;        \
+                  orl $0x200, %eax; \
+                  pushl %eax;       \
+                  pushl $0x1B;      \
+                  push $1f;         \
+                  iret;             \
+                  1:                \
+                  ");
+}

user_space.h

@@ -0,0 +1,6 @@
+#ifndef _USER_SPACE_H
+#define _USER_SPACE_H
+
+void enter_user_space(void);
+
+#endif