diff options
| -rw-r--r-- | src/stacks.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/stacks.c b/src/stacks.c index f4d15ce9..2fe1bfbd 100644 --- a/src/stacks.c +++ b/src/stacks.c @@ -66,8 +66,10 @@ call32_prep(u8 method) // Backup cmos index register and disable nmi u8 cmosindex = inb(PORT_CMOS_INDEX); - outb(cmosindex | NMI_DISABLE_BIT, PORT_CMOS_INDEX); - inb(PORT_CMOS_DATA); + if (!(cmosindex & NMI_DISABLE_BIT)) { + outb(cmosindex | NMI_DISABLE_BIT, PORT_CMOS_INDEX); + inb(PORT_CMOS_DATA); + } SET_LOW(Call16Data.cmosindex, cmosindex); SET_LOW(Call16Data.method, method); @@ -103,8 +105,11 @@ call32_post(void) } // Restore cmos index register - outb(GET_LOW(Call16Data.cmosindex), PORT_CMOS_INDEX); - inb(PORT_CMOS_DATA); + u8 cmosindex = GET_LOW(Call16Data.cmosindex); + if (!(cmosindex & NMI_DISABLE_BIT)) { + outb(cmosindex, PORT_CMOS_INDEX); + inb(PORT_CMOS_DATA); + } return method; } |