Enable interrupts

src/Makefile

@@ -8,10 +8,11 @@ LD_SCRIPT := linker.ld
 BOOT_OBJ := $(addsuffix .cc,$(basename $(shell find ./boot -name '*.cc' -name '*.S' ! -name "boot.S")))
 DRIVERS_OBJ := $(addsuffix .o,$(basename $(shell find ./drivers -name '*.cc' -o -name '*.S')))
 LIBS_OBJ := $(addsuffix .cc,$(basename $(shell find ./libs -name '*.cc' -o -name '*.S')))
+CORE_OBJ := $(addsuffix .o,$(basename $(shell find ./core -name '*.cc' -o -name '*.S')))
 
 all: $(EXEC)
 
-$(EXEC): boot/boot.o $(BOOT_OBJ) $(DRIVERS_OBJ) $(LIBS_OBJ) boucane.o
+$(EXEC): boot/boot.o $(BOOT_OBJ) $(DRIVERS_OBJ) $(LIBS_OBJ) $(CORE_OBJ) boucane.o
 	$(CC) -n -T $(LD_SCRIPT) -nostdlib -o $@ $^
 
 %.o: %.S

src/boot/boot.S

@@ -112,20 +112,20 @@ lgdt (gdtr)
 jmp $0x08, $new_cs
 new_cs:
 
+# Pay attention here!
+# You are in long mode here
+# Thus if you want to add any instructions
+# You should use .code64 before
+.code64
 mov $0x10, %ax
 mov %ax, %ds
 mov %ax, %es
 mov %ax, %fs
 mov %ax, %gs
 mov %ax, %ss
-
-# Pay attention here!
-# You are in long mode here
-# Thus if you want to add any instructions
-# You should use .code64 before
+mov $STACK_LOCATION, %esp
 
 # Run boucane
-.code64
 jmp boucane
 
 # GDT

src/boucane.cc

@@ -1,19 +1,10 @@
 #include "boucane.hpp"
-#include "libs/string.hpp"
+#include "core/idt.hpp"
 
 extern "C" void boucane(){
     clear();
-    char a[]="Loic Guegan";
     printk("Booting Boucane v%d.%d.%d",VERSION_MAJOR,VERSION_MINOR, VERSION_PATH);
-
-    char b[10];
-    substr(8, 9, a, b);
-    print("\n");
-    printk(b);
-
-    int gg=0;
-    gg+=((1>2) ? 1 : 0)+9;
-    printi(gg);
+    idt_enable_interrupt();
 
     while(1);
 }

src/core/idt.cc

@@ -0,0 +1,51 @@
+#include "idt.hpp"
+#include "libs/string.hpp"
+
+IDT_REGISTER IDTR = {
+    IDT_GATE_SIZE*IDT_MAX_ENTRIES,
+    IDT_ADDR
+};
+
+extern u64 INT_DEFAULT,INT_0,INT_14;
+
+void idt_enable_interrupt(void){
+    IDT_DESCRIPTOR d;
+    d.ign=0;
+    d.ist=0;
+    d.selector=0x08;
+    d.options=IDT_OPT_P|IDT_OPT_PRVL_0|IDT_OPT_TYPE_INT;
+
+    // Write idt entries
+    for(u16 i=0;i<IDT_MAX_ENTRIES;i++){
+        if(i==0){ // Zero-division
+            d.offset=(u64)&INT_0;
+            idt_write_descriptor(d, i);
+        }
+        else if(i==14){ // Page fault
+            d.offset=(u64)&INT_14;
+            idt_write_descriptor(d, i);
+        }
+        else {
+            d.offset=(u64)&INT_DEFAULT;
+            idt_write_descriptor(d, i);
+        }
+    }
+
+    // Enable interrupts
+    asm(
+        "lidt (IDTR)   \n\t"
+        "sti           \n\t"
+    );
+}
+
+void idt_write_descriptor(IDT_DESCRIPTOR desc, u16 index){
+    u32 desc0_31=(desc.selector << 16) | desc.offset&0xFFFF;
+    u32 desc32_63=desc.ist | desc.options | (desc.offset&0xFFFF0000);
+    u32 desc64_95=desc.offset>>32;
+    u32 desc96_127=desc.ign;
+    u32* dst=(u32*)(IDTR.base+index*IDT_GATE_SIZE);
+    *dst=desc0_31;
+    *(dst+1)=desc32_63;
+    *(dst+2)=desc64_95;
+    *(dst+3)=desc96_127;
+}

src/core/idt.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "types.hpp"
+#include "libs/stdio.hpp"
+
+#define IDT_GATE_SIZE 16
+#define IDT_MAX_ENTRIES 50
+#define IDT_ADDR 0x200000
+
+#define IDT_OPT_P (1 << 15)
+#define IDT_OPT_TYPE_INT 0xE << 8
+#define IDT_OPT_PRVL_0 0
+#define IDT_OPT_PRVL_1 (1 << 13)
+#define IDT_OPT_PRVL_2 (2 << 13)
+#define IDT_OPT_PRVL_3 (3 << 13)
+
+
+
+typedef struct IDT_REGISTER {
+    u16 limit;
+    u64 base;
+} __attribute__((packed)) IDT_REGISTER;
+
+typedef struct IDT_DESCRIPTOR {
+    u64 offset;
+    u16 selector;
+    u16 options;
+    u8 ist;
+    u32 ign;
+} __attribute__((packed)) IDT_DESCRIPTOR;
+
+void idt_enable_interrupt(void);
+void idt_write_descriptor(IDT_DESCRIPTOR desc, u16 index);

src/core/int.S

@@ -0,0 +1,33 @@
+.extern printk
+
+.macro call_printk msg
+    mov \msg, %rdi
+    mov $0, %eax # Required for variadic functions
+    call printk
+.endm
+
+.globl INT_DEFAULT
+INT_DEFAULT:
+    iretq
+
+.globl INT_0
+INT_0:
+    call_printk $MSG_INT_0
+    INT_0_INFINITE:
+    jmp INT_0_INFINITE
+    iretq
+
+.globl INT_14
+INT_14:
+    call_printk $MSG_INT_14
+    mov $0, %eax
+    call printk
+    INT_14_INFINITE:
+    jmp INT_14_INFINITE
+    iretq
+
+
+MSG_INT_0:
+.asciz "Zero Division error!"
+MSG_INT_14:
+.asciz "Page fault!"

src/libs/stdio.cc

@@ -91,13 +91,6 @@ void print(char *s){
   }
 }
 
-void printc(char *str, VIDEO_COLORS c) {
-  VIDEO_COLORS backup = (VIDEO_COLORS)VS.fg;
-  VS.fg = c;
-  print(str);
-  VS.fg = backup;
-}
-
 void printi(int i) {
   char str[12];
   itoa(i, str);
@@ -107,17 +100,8 @@ void printi(int i) {
 void printh(int h) {
   char str[17];
   itoh(h, str);
-  print(str);
-}
-void printh(int h, u32 size) {
-  char str[17];
-  char str2[17];
-  itoh(h, str);
-  u32 a = 0;
-  for (u32 i = min(max(16 - size, 0), 15); i < 16; i++) {
-    str2[a] = str[i];
-    a++;
-  }
-  str2[a] = '\0';
-  print(str2);
+  u8 i=0;
+  while(str[i]=='0')
+    i++;
+  print(&str[i]);
 }

src/libs/stdio.hpp

@@ -8,18 +8,13 @@ extern void (*__putchar)(char);
 /**
  * Print a char* in the framebuffer
  */
-void printk(char *,...);
+extern "C" void printk(char *,...);
 
 /**
  * Print a char*
  */
 void print(char *s);
 
-/**
- * Print a char in the framebuffer
- */
-void printc(char *, VIDEO_COLORS c);
-
 /**
  * Print an integer using itoa()
  */
@@ -30,7 +25,3 @@ void printi(int i);
  */
 void printh(int h);
 
-/**
- * Print an integer as hex using itoh() truncated to size
- */
-void printh(int h, u32 size);