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[HALX86] Set the NMI disable flag when accessing CMOS registers

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An NMI while accessing the CMOS can leave it in an undefined state. NMIs are used on x64 SMP for CPU freeze in the debugger.
This commit is contained in:
Timo Kreuzer 2025-03-19 20:33:08 +02:00
parent 94fc56c038
commit 2c057d9bc1
1 changed files with 4 additions and 4 deletions
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8
hal/halx86/generic/cmos.c
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@ -24,8 +24,8 @@ UCHAR
NTAPI
HalpReadCmos(IN UCHAR Reg)
{
/* Select the register */
WRITE_PORT_UCHAR(CMOS_CONTROL_PORT, Reg);
/* Select the register (0x80 to disable NMIs) */
WRITE_PORT_UCHAR(CMOS_CONTROL_PORT, 0x80 | Reg);
/* Query the value */
return READ_PORT_UCHAR(CMOS_DATA_PORT);
@ -37,8 +37,8 @@ NTAPI
HalpWriteCmos(IN UCHAR Reg,
IN UCHAR Value)
{
/* Select the register */
WRITE_PORT_UCHAR(CMOS_CONTROL_PORT, Reg);
/* Select the register (0x80 to disable NMIs) */
WRITE_PORT_UCHAR(CMOS_CONTROL_PORT, 0x80 | Reg);
/* Write the value */
WRITE_PORT_UCHAR(CMOS_DATA_PORT, Value);