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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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31 lines
673 B
ArmAsm
31 lines
673 B
ArmAsm
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#include "ppc_asm.h"
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.text
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.global _zimage_start
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_zimage_start:
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/* PPC errata 213: needed by Virtex-4 FX */
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mfccr0 0
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oris 0,0,0x50000000@h
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mtccr0 0
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/*
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* Invalidate the data cache if the data cache is turned off.
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* - The 405 core does not invalidate the data cache on power-up
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* or reset but does turn off the data cache. We cannot assume
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* that the cache contents are valid.
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* - If the data cache is turned on this must have been done by
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* a bootloader and we assume that the cache contents are
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* valid.
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*/
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mfdccr r9
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cmplwi r9,0
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bne 2f
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lis r9,0
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li r8,256
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mtctr r8
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1: dccci r0,r9
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addi r9,r9,0x20
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bdnz 1b
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2: b _zimage_start_lib
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