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Implement PIIX SMI gate. Fixes some issues seen on Shuttle HOT-433

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when power management disabled in BIOS, which results in the BIOS
failing to initialise and relocate the SMI handler but still advertise
APM availability.
This commit is contained in:
SarahW 2020-11-09 19:29:21 +00:00
commit 4683d674b6
1 changed files with 4 additions and 1 deletions
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5
src/piix.c
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@ -29,9 +29,11 @@ static sff_busmaster_t piix_busmaster[2];
static uint8_t piix_rc = 0; static uint8_t piix_rc = 0;
static void (*piix_nb_reset)(); static void (*piix_nb_reset)();
#define REG_SMICNTL 0xa0
#define REG_SMIEN 0xa2 #define REG_SMIEN 0xa2
#define REG_SMIREQ 0xaa #define REG_SMIREQ 0xaa
#define SMICNTL_CSMIGATE (1 << 0)
#define SMIEN_APMC (1 << 7) #define SMIEN_APMC (1 << 7)
#define SMIREQ_RAPMC (1 << 7) #define SMIREQ_RAPMC (1 << 7)
@ -262,7 +264,8 @@ static void piix_apm_write(uint16_t port, uint8_t val, void *p)
{ {
card_piix[REG_SMIREQ] |= SMIREQ_RAPMC; card_piix[REG_SMIREQ] |= SMIREQ_RAPMC;
// pclog("APMC write causes SMI\n"); // pclog("APMC write causes SMI\n");
x86_smi_trigger(); if (card_piix[REG_SMICNTL] & SMICNTL_CSMIGATE)
x86_smi_trigger();
} }
break; break;