[x86 setup] APM: BX should be zero when disconnecting
For APM calls, BX contains the device index, which is zero for the system BIOS. Disconnect requres BX = 0. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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1 changed files with 3 additions and 2 deletions
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@ -45,9 +45,10 @@ int query_apm_bios(void)
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/* Disconnect first, just in case */
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ax = 0x5304;
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bx = 0;
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asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp"
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: "+a" (ax)
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: : "ebx", "ecx", "edx", "esi", "edi");
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: "+a" (ax), "+b" (bx)
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: : "ecx", "edx", "esi", "edi");
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/* Paranoia */
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ebx = esi = 0;
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