Commit 59acc08f authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by H. Peter Anvin

[x86 setup] video setup: Fix VBE DDC reading

Add memory operand constraint and write-only modifier to the inline
assembly to effect the writing of the EDID block to boot_params.edid_info.

Without this, gcc would think the EDID query was dead code and would
eliminate it.
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 1ed43950
...@@ -268,7 +268,7 @@ void vesa_store_edid(void) ...@@ -268,7 +268,7 @@ void vesa_store_edid(void)
dx = 0; /* EDID block number */ dx = 0; /* EDID block number */
di =(size_t) &boot_params.edid_info; /* (ES:)Pointer to block */ di =(size_t) &boot_params.edid_info; /* (ES:)Pointer to block */
asm(INT10 asm(INT10
: "+a" (ax), "+b" (bx), "+d" (dx) : "+a" (ax), "+b" (bx), "+d" (dx), "=m" (boot_params.edid_info)
: "c" (cx), "D" (di) : "c" (cx), "D" (di)
: "esi"); : "esi");
#endif /* CONFIG_FIRMWARE_EDID */ #endif /* CONFIG_FIRMWARE_EDID */
......
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