fef
27c516b896
We will only work in raw character mode for now, it's probably gonna take a *lot* of time until we have an actual VGA driver qwq
124 lines
2.8 KiB
ArmAsm
124 lines
2.8 KiB
ArmAsm
/* See the end of this file for copyright and license terms. */
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#include <asm/common.h>
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#include <gay/config.h>
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#include <multiboot.h>
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/* see arch/x86/config/kernel.ld */
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.extern _kernel_end
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.extern _image_end
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.extern _stack_end
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.extern _boot
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.section .multiboot
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mb2_load_start:
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.align MB2_HEADER_ALIGN
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header_start: /* struct mb2_header */
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/* magic */
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.long MB2_HEADER_MAGIC
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/* architecture */
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.long MB2_ARCHITECTURE_I386
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/* heaer_length */
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.long header_end - header_start
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/* checksum */
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.long (1 << 33) - MB2_HEADER_MAGIC - MB2_ARCHITECTURE_I386 - (header_end - header_start)
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.align MB2_TAG_ALIGN
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address_tag_start: /* struct mb2_header_tag_address */
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/* type */
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.short MB2_HEADER_TAG_ADDRESS
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/* flags */
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.short MB2_HEADER_TAG_OPTIONAL
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/* size */
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.long address_tag_end - address_tag_start
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/* header_addr */
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.long header_start
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/* load_addr */
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.long mb2_load_start
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/* load_end_addr */
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.long _kernel_end
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/* bss_end_addr */
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.long _image_end
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address_tag_end:
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.align MB2_TAG_ALIGN
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entry_address_tag_start: /* struct mb2_header_tag_entry_address */
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/* type */
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.short MB2_HEADER_TAG_ENTRY_ADDRESS
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/* flags */
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.short MB2_HEADER_TAG_OPTIONAL
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/* size */
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.long entry_address_tag_end - entry_address_tag_start
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/* entry_addr */
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.long _start
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entry_address_tag_end:
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#if 0 /* TODO: implement graphics */
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.align MB2_TAG_ALIGN
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framebuffer_tag_start: /* struct mb2_header_tag_framebuffer */
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/* type */
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.short MB2_HEADER_TAG_FRAMEBUFFER
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/* flags */
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.short MB2_HEADER_TAG_OPTIONAL
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/* size */
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.long framebuffer_tag_end - framebuffer_tag_start
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/* width */
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.long 1024
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/* height */
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.long 768
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/* depth */
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.long 32
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framebuffer_tag_end:
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#endif /* framebuffer disabled */
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.align MB2_TAG_ALIGN
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end_tag_start: /* struct mb2_header_tag */
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/* type */
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.short MB2_HEADER_TAG_END
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/* flags */
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.short 0
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/* size */
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.long end_tag_end - end_tag_start
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end_tag_end:
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header_end:
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.text
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asmfn_begin(_start)
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mov $_stack_end, %esp
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/* reset EFLAGS */
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pushl $0
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popf
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/* parameter 2 for _boot() is header address */
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push %ebx
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/* parameter 1 for _boot() is MB2_BOOTLOADER_MAGIC */
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push %eax
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/* call _boot() from boot.c */
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call _boot
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/* this should never(TM) be reached */
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halt_loop:
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hlt
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jmp halt_loop
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asmfn_end(_start)
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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