separating: there will be libk and libc

kernel/loader.s

@@ -0,0 +1,217 @@
+; Kernel loader assembly stub and multiboot2 header
+; Author: xamidev
+; Licensed under the Unlicense. See the repo below.
+; https://github.com/xamidev/blankos
+
+global loader
+
+section .multiboot_header
+
+mb_start:
+align 8
+
+; ASM macros
+
+MAGIC_NUMBER      equ 0xe85250d6  	; multiboot2 magic 
+FLAGS             equ 0x0	  		; 32-bit protected mode for i386
+HEADER_LEN	  equ mb_end-mb_start
+CHECKSUM          equ -(MAGIC_NUMBER + FLAGS + HEADER_LEN)
+
+; Multiboot 2 header, according to specification (16bytes)
+
+  dd MAGIC_NUMBER		; dd = 4 bytes = 32bits = u32
+  dd FLAGS			
+  dd HEADER_LEN
+  dd CHECKSUM
+
+; Tags? (28bytes)
+
+; Tag 1 : set graphics mode (only recommended, can be overriden by GRUB)
+  align 8
+  dw 5			; 2
+  dw 0			; 2
+  dd 20			; 4
+  dd 1920		; 4
+  dd 1080		; 4
+  dd 32			; 4
+
+; End of tags
+
+  align 8
+  dw 0			; 2
+  dw 0			; 2
+  dd 8			; 4
+
+; End of Multiboot 2 header
+mb_end:
+
+section .text:
+
+KERNEL_STACK_SIZE equ 4096
+extern kmain
+
+loader:
+	mov esp, kernel_stack + KERNEL_STACK_SIZE
+  	cli
+  	push ebx
+  	call kmain
+
+.loop:
+  	jmp .loop
+
+global gdt_flush
+extern gp
+
+gdt_flush:
+	lgdt [gp]
+	mov ax, 0x10
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	mov ss, ax
+	jmp 0x08:flush2
+
+flush2:
+	ret
+
+global idt_load
+extern idtp
+
+idt_load:
+	lidt [idtp]
+	ret
+
+%macro ISR_NOERRCODE 1
+	global isr%1
+	isr%1:
+		cli
+		push byte 0
+		push byte %1
+		jmp isr_common_stub
+%endmacro
+
+%macro ISR_ERRCODE 1
+	global isr%1
+	isr%1:
+		cli
+		push byte %1
+		jmp isr_common_stub
+%endmacro
+
+ISR_NOERRCODE 0
+ISR_NOERRCODE 1
+ISR_NOERRCODE 2
+ISR_NOERRCODE 3
+ISR_NOERRCODE 4
+ISR_NOERRCODE 5
+ISR_NOERRCODE 6
+ISR_NOERRCODE 7
+ISR_ERRCODE 8
+ISR_NOERRCODE 9
+ISR_ERRCODE 10
+ISR_ERRCODE 11
+ISR_ERRCODE 12
+ISR_ERRCODE 13
+ISR_ERRCODE 14
+ISR_NOERRCODE 15
+ISR_NOERRCODE 16
+ISR_NOERRCODE 17
+ISR_NOERRCODE 18
+ISR_NOERRCODE 19
+ISR_NOERRCODE 20
+ISR_NOERRCODE 21
+ISR_NOERRCODE 22
+ISR_NOERRCODE 23
+ISR_NOERRCODE 24
+ISR_NOERRCODE 25
+ISR_NOERRCODE 26
+ISR_NOERRCODE 27
+ISR_NOERRCODE 28
+ISR_NOERRCODE 29
+ISR_NOERRCODE 30
+ISR_NOERRCODE 31
+
+extern fault_handler
+
+isr_common_stub:
+	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
+
+%macro IRQ 2
+	global irq%1
+	irq%1:
+		cli
+		push byte 0
+		push byte %2
+		jmp irq_common_stub
+%endmacro
+
+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 irq_handler
+
+irq_common_stub:
+	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
+
+section .bss
+align 4 
+
+kernel_stack:
+	resb KERNEL_STACK_SIZE