49 lines
1.1 KiB
PHP
49 lines
1.1 KiB
PHP
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#include <arch/rom_segs.h>
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#include <cpu/x86/post_code.h>
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#include <arch/x86/gdt_init.S>
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.code32
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/*
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* When we come here we are in protected mode. We expand
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* the stack and copies the data segment from ROM to the
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* memory.
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*
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* After that, we call the chipset bootstrap routine that
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* does what is left of the chipset initialization.
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*
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* NOTE aligned to 4 so that we are sure that the prefetch
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* cache will be reloaded.
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*
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* In the bootblock there is already a ljmp to __protected_start and
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* the reset vector jumps to symbol _start16bit in entry16.inc from
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* the reset vectors's symbol which is _start. Therefore, don't
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* expose the _start symbol for bootblock.
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*/
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.align 4
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#if !ENV_BOOTBLOCK
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.globl _start
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_start:
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#endif
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lgdt %cs:gdtptr
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ljmp $ROM_CODE_SEG, $__protected_start
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__protected_start:
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/* Save the BIST value */
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movl %eax, %ebp
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#if !CONFIG(NO_EARLY_BOOTBLOCK_POSTCODES)
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post_code(POST_ENTER_PROTECTED_MODE)
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#endif
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movw $ROM_DATA_SEG, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movw %ax, %fs
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movw %ax, %gs
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/* Restore the BIST value to %eax */
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movl %ebp, %eax
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