61 lines
1.2 KiB
ArmAsm
61 lines
1.2 KiB
ArmAsm
|
.set MB_MAGIC, 0x1BADB002
|
||
|
|
.set MB_FLAG_PAGE_ALIGN, 1 << 0
|
||
|
|
.set MB_FLAG_MEMORY_INFO, 1 << 1
|
||
|
|
.set MB_FLAG_GRAPHICS, 1 << 2
|
||
|
|
.set MB_FLAGS, MB_FLAG_PAGE_ALIGN | MB_FLAG_MEMORY_INFO | MB_FLAG_GRAPHICS
|
||
|
|
.set MB_CHECKSUM, -(MB_MAGIC + MB_FLAGS)
|
||
|
|
|
||
|
|
.section .multiboot
|
||
|
|
.align 4
|
||
|
|
|
||
|
|
/* Multiboot section */
|
||
|
|
.long MB_MAGIC
|
||
|
|
.long MB_FLAGS
|
||
|
|
.long MB_CHECKSUM
|
||
|
|
.long 0x00000000 /* header_addr */
|
||
|
|
.long 0x00000000 /* load_addr */
|
||
|
|
.long 0x00000000 /* load_end_addr */
|
||
|
|
.long 0x00000000 /* bss_end_addr */
|
||
|
|
.long 0x00000000 /* entry_addr */
|
||
|
|
|
||
|
|
/* Request linear graphics mode */
|
||
|
|
.long 0x00000000
|
||
|
|
.long 0
|
||
|
|
.long 0
|
||
|
|
.long 32
|
||
|
|
|
||
|
|
/* .stack resides in .bss */
|
||
|
|
.section .stack, "aw", @nobits
|
||
|
|
stack_bottom:
|
||
|
|
.skip 32768 /* 32KiB */
|
||
|
|
stack_top:
|
||
|
|
|
||
|
|
.section .text
|
||
|
|
|
||
|
|
.global start
|
||
|
|
.type start, @function
|
||
|
|
|
||
|
|
.extern kmain
|
||
|
|
.type kmain, @function
|
||
|
|
|
||
|
|
start:
|
||
|
|
/* Setup our stack */
|
||
|
|
mov $stack_top, %esp
|
||
|
|
|
||
|
|
/* Make sure our stack is 16-byte aligned */
|
||
|
|
and $-16, %esp
|
||
|
|
|
||
|
|
pushl %esp
|
||
|
|
pushl %eax /* Multiboot header magic */
|
||
|
|
pushl %ebx /* Multiboot header pointer */
|
||
|
|
|
||
|
|
/* Disable interrupts and call kernel proper */
|
||
|
|
cli
|
||
|
|
call kmain
|
||
|
|
|
||
|
|
/* Clear interrupts and hang if we return from kmain */
|
||
|
|
cli
|
||
|
|
hang:
|
||
|
|
hlt
|
||
|
|
jmp hang
|