Collate ASM files

All ASM now uses Intel syntax.
isr.s and gdt.s are now collated into the main file.
It's bulky, but ¯\_(ツ)_/¯
UNTESTED, cause i'm thick.

arch/i386/boot.s

@@ -1,38 +1,183 @@
-.set ALIGN,    1<<0
-.set MEMINFO,  1<<1
-.set FLAGS,    ALIGN | MEMINFO
-.set MAGIC,    0x1BADB002
-.set CHECKSUM, -(MAGIC + FLAGS)
+MBOOT_ALIGN    equ <<0
+MBOOT_MEMINFO  equ 1<<1
+MBOOT_FLAGS    equ MBOOT_ALIGN | MBOOT_MEMINFO
+MBOOT_MAGIC    equ 0x1BADB002
+MBOOT_CHECKSUM equ -(MAGIC + FLAGS)
 
-.section .multiboot
-.align 4
-.long MAGIC
-.long FLAGS
-.long CHECKSUM
+[BITS 32]
 
-# C stack startup
-.section .bss
-.align 16
-stack_bottom:
-	.skip 16384
-stack_top:
+[GLOBAL mboot]
 
-# start function - calls kernel_main
-.section .text
-.global _start
-.type _start, @function
+[EXTERN code]
+[EXTERN bss]
+[EXTERN end]
+mboot:
+	dd MBOOT_MAGIC
+	dd MBOOT_FLAGS
+	dd mboot
+	dd code
+	dd bss
+	dd end
+	dd start
 	
-_start:
-	movl $stack_top, %esp
+[GLOBAL start]
+[EXTERN kernel_main]
 
-	call _init
-	
-	call kernel_main
+start:
+	push ebx
 	
 	cli
-1:  hlt
-	jmp 1b
+	call kernel_main
+	jmp $
 
-.size _start, . - _start
+[GLOBAL load_gdt]    ; Allows the C code to call gdt_flush().
+[EXTERN gp]
+load_gdt:
+    mov eax, [esp+4] ; Get the pointer to the GDT, passed as a parameter.
+    lgdt [eax]        ; Load the new GDT pointer
 
+    mov ax, 0x10      ; 0x10 is the offset in the GDT to our data segment
+    mov ds, ax        ; Load all data segment selectors
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    mov ss, ax
+    jmp 0x08:flush   ; 0x08 is the offset to our code segment: Far jump!
+flush:
+    ret
+	
+%macro ISR 1
+	global isr%1
+	isr%1:
+		cli
+		push byte 0
+		push byte %1
+		jmp isr_common
+%endmacro
+
+%macro ISR_ERR 1
+	global isr%1
+	isr%1:
+		cli 
+		push byte %1
+		jmp isr_common
+%endmacro
+
+%macro IRQ 2
+	global irq%1
+	irq%1:
+		cli
+		push byte 0
+		push byte %2
+		jmp irq_common
+%endmacro
+
+ISR 0
+ISR 1
+ISR 2
+ISR 3
+ISR 4
+ISR 5
+ISR 6
+ISR 7
+ISR_ERR 8
+ISR 9
+ISR_ERR 10
+ISR_ERR 11
+ISR_ERR 12
+ISR_ERR 13
+ISR_ERR 14
+ISR 15
+ISR 16
+ISR_ERR 17
+ISR 18
+ISR 19
+ISR 20
+ISR 21
+ISR 22
+ISR 23
+ISR 24
+ISR 25
+ISR 26
+ISR 27
+ISR 28
+ISR 29
+ISR_ERR 30
+ISR 31
+
+IRQ 0, 32
+IRQ 1, 33
+IRQ 2, 34
+IRQ 3, 35
+IRQ 4, 36
+IRQ 5, 37
+IRQ 6, 38
+IRQ 7, 39
+IRQ 8, 40
+IRQ 9, 41
+IRQ 10, 42
+IRQ 11, 43
+IRQ 12, 44
+IRQ 13, 45
+IRQ 14, 46
+IRQ 15, 47
+	
+extern fault_handler
+
+isr_common:
+	pusha
+	push ds
+	push es
+	push fs
+	push gs
+	mov ax, 0x10
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	mov eax, esp
+	push eax
+	
+	mov eax, fault_handler
+	call eax
+	
+	pop eax
+	pop gs
+	pop fs
+	pop es
+	pop ds
+	popa
+	add esp, 8
+	iret
+
+extern irq_handler
+
+irq_common:
+	pusha
+	push ds
+	push es
+	push fs
+	push gs
+	mov ax, 0x10
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	mov eax, esp
+	push eax
+	mov eax, irq_handler
+	call eax
+	pop eax
+	pop gs
+	pop fs
+	pop es
+	pop ds
+	popa
+	add esp, 8
+	iret
+
+idt_load:
+	mov eax, [esp+4]
+	lidt [eax]
+	ret
 	

arch/i386/crti.s

@@ -1,15 +0,0 @@
-.section .init
-.global _init
-.type _init, @function
-
-_init:
-	push %ebp
-	movl %esp, %ebp
-	
-.section .fini 
-.global _fini
-.type _fini, @function
-
-_fini:
-	push %ebp
-	movl %esp, %ebp

arch/i386/crtn.s

@@ -1,7 +0,0 @@
-.section .init
-	popl %ebp
-	ret
-
-.section .fini
-	popl %ebp
-	ret