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SMM: add mainboard_apm_cnt() callback 

motherboards can use this hook to get notified if someone writes
to the APM_CNT port (0xb2). If the hook returns 1, the chipset
specific hook is also skipped.

Change-Id: I05f1a27cebf9d25db8064f2adfd2a0f5759e48b5
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/3
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)
This commit is contained in:
Sven Schnelle 2011-06-04 19:35:22 +02:00 committed by Patrick Georgi
parent 140a990a61
commit c21b054acc
2 changed files with 4 additions and 1 deletions
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2
src/include/cpu/x86/smm.h
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@ -263,4 +263,4 @@ void __attribute__((weak)) northbridge_smi_handler(unsigned int node, smm_state_
void __attribute__((weak)) southbridge_smi_handler(unsigned int node, smm_state_save_area_t *state_save); void __attribute__((weak)) southbridge_smi_handler(unsigned int node, smm_state_save_area_t *state_save);
void __attribute__((weak)) mainboard_smi_gpi(u16 gpi_sts); void __attribute__((weak)) mainboard_smi_gpi(u16 gpi_sts);
int __attribute__((weak)) mainboard_apm_cnt(u8 data);

3
src/southbridge/intel/i82801gx/smihandler.c
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@ -362,6 +362,9 @@ static void southbridge_smi_apmc(unsigned int node, smm_state_save_area_t *state
/* Emulate B2 register as the FADT / Linux expects it */ /* Emulate B2 register as the FADT / Linux expects it */
reg8 = inb(APM_CNT); reg8 = inb(APM_CNT);
if (mainboard_apm_cnt && mainboard_apm_cnt(reg8))
return;
switch (reg8) { switch (reg8) {
case CST_CONTROL: case CST_CONTROL:
/* Calling this function seems to cause /* Calling this function seems to cause