2015-05-20 10:12:20 +03:00
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.set MB_MAGIC, 0x1BADB002
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.set MB_FLAG_PAGE_ALIGN, 1 << 0
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.set MB_FLAG_MEMORY_INFO, 1 << 1
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.set MB_FLAG_GRAPHICS, 1 << 2
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.set MB_FLAGS, MB_FLAG_PAGE_ALIGN | MB_FLAG_MEMORY_INFO | MB_FLAG_GRAPHICS
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.set MB_CHECKSUM, -(MB_MAGIC + MB_FLAGS)
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.section .multiboot
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.align 4
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/* Multiboot section */
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.long MB_MAGIC
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.long MB_FLAGS
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.long MB_CHECKSUM
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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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/* Request linear graphics mode */
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.long 0x00000000
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2015-09-19 06:00:58 +03:00
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.long 0
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.long 0
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.long 32
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2015-05-20 10:12:20 +03:00
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/* .stack resides in .bss */
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.section .stack, "aw", @nobits
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stack_bottom:
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2016-12-30 12:13:10 +03:00
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.skip 32768 /* 32KiB */
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2015-05-20 10:12:20 +03:00
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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 kmain
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.type kmain, @function
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start:
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/* Setup our stack */
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mov $stack_top, %esp
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2015-05-21 22:09:42 +03:00
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/* Make sure our stack is 16-byte aligned */
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and $-16, %esp
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pushl %esp
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2015-05-20 10:12:20 +03:00
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pushl %eax /* Multiboot header magic */
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pushl %ebx /* Multiboot header pointer */
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/* Disable interrupts and call kernel proper */
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cli
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call kmain
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/* Clear interrupts and hang if we return from kmain */
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cli
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hang:
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hlt
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jmp hang
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