mirror of
https://github.com/RGBCube/serenity
synced 2025-05-29 06:25:07 +00:00
b957c61e6f
This implements a very basic VGA device using the information provided to us by the bootloader in the multiboot header. This allows Serenity to boot to the desktop on basically any halfway modern system.
71 lines
1.3 KiB
ArmAsm
71 lines
1.3 KiB
ArmAsm
.set MULTIBOOT_MAGIC, 0x1badb002
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.set MULTIBOOT_PAGE_ALIGN, 0x1
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.set MULTIBOOT_MEMORY_INFO, 0x2
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.set MULTIBOOT_VIDEO_MODE, 0x4
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.set multiboot_flags, MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO | MULTIBOOT_VIDEO_MODE
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.set multiboot_checksum, -(MULTIBOOT_MAGIC + multiboot_flags)
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.section .multiboot
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.align 4
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.long MULTIBOOT_MAGIC
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.long multiboot_flags
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.long multiboot_checksum
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/* for MULTIBOOT_MEMORY_INFO */
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.long 0x00000000 /* header_addr */
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.long 0x00000000 /* load_addr */
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.long 0x00000000 /* load_end_addr */
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.long 0x00000000 /* bss_end_addr */
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.long 0x00000000 /* entry_addr */
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/* for MULTIBOOT_VIDEO_MODE */
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.long 0x00000000 /* mode_type */
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.long 1024 /* width */
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.long 768 /* height */
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.long 32 /* depth */
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.section .stack, "aw", @nobits
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stack_bottom:
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.skip 32768
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stack_top:
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.section .text
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.global start
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.type start, @function
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.extern init
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.type init, @function
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.extern multiboot_info_ptr
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.type multiboot_info_ptr, @object
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start:
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cli
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cld
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mov $stack_top, %esp
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and $-16, %esp
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pushl %esp
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pushl %eax /* Multiboot header magic */
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pushl %ebx /* Multiboot header pointer */
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mov %ebx, multiboot_info_ptr
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call init
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pushl $exit_message
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call kprintf
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cli
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loop:
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hlt
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jmp loop
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exit_message:
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.asciz "Kernel exited."
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