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Re: grub2 code
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From: |
Vladimir 'φ-coder/phcoder' Serbinenko |
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Subject: |
Re: grub2 code |
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Date: |
Mon, 03 Feb 2014 17:51:18 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.2.0 |
On 03.02.2014 12:57, Colin Watson wrote:
> movw $(GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR + 0x17), %bx
> andb $3, (%bx)
andb $3, (%bx) is equivalent to C code:
*(grub_uint8_t *)bx &= 3;
andb modifies the value at (%bx). You probably meant to use testb which
has same flag semantics but doesn't change operands
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- grub2 code, Robert Parnell, 2014/02/02
- Re: grub2 code,
Vladimir 'φ-coder/phcoder' Serbinenko <=