soc/amd/picasso/bootblock: Clear BSS section
We are currently relying on the assumption that the amdcompress tool will zero out the bss section. Instead of relying on this assumption, lets explicitly clear it. The implementation was copied from assembly_entry.S. BUG=b:147042464 TEST=Cold boot trembyle and also s3 resume trembyle Signed-off-by: Raul E Rangel <rrangel@chromium.org> Change-Id: Ifb4f4cc6932dd4c3c92d4e7647569f9a0c69ea4c Reviewed-on: https://review.coreboot.org/c/coreboot/+/42475 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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@ -23,6 +23,15 @@ bootblock_resume_entry:
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bootblock_pre_c_entry:
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post_code(0xa0)
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/* Clear .bss section */
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cld
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xor %eax, %eax
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movl $(_ebss), %ecx
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movl $(_bss), %edi
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sub %edi, %ecx
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shrl $2, %ecx
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rep stosl
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movl $_eearlyram_stack, %esp
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/* Align the stack and keep aligned for call to bootblock_c_entry() */
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