From 7f3d442abb2a8ff6f6728527ab7665fd79fd60cd Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Wed, 3 Oct 2012 19:01:57 -0700 Subject: SMM: Avoid use of global variables in SMI handler Using global variables with the TSEG is a bad idea because they are not relocated properly right now. Instead make the variables static and add accessor functions for the rest of SMM to use. At the same time drop the tcg/smi1 pointers as they are not setup or ever used. (the debug output is added back in a subsequent commit) Change-Id: If0b2d47df4e482ead71bf713c1ef748da840073b Signed-off-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/1764 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- src/southbridge/intel/bd82x6x/nvs.h | 4 ++++ src/southbridge/intel/bd82x6x/smihandler.c | 21 ++++++++++++--------- 2 files changed, 16 insertions(+), 9 deletions(-) (limited to 'src/southbridge') diff --git a/src/southbridge/intel/bd82x6x/nvs.h b/src/southbridge/intel/bd82x6x/nvs.h index 3fa0093992..b8506d4db4 100644 --- a/src/southbridge/intel/bd82x6x/nvs.h +++ b/src/southbridge/intel/bd82x6x/nvs.h @@ -152,3 +152,7 @@ typedef struct { chromeos_acpi_t chromeos; } __attribute__((packed)) global_nvs_t; +#ifdef __SMM__ +/* Used in SMM to find the ACPI GNVS address */ +global_nvs_t *smm_get_gnvs(void); +#endif diff --git a/src/southbridge/intel/bd82x6x/smihandler.c b/src/southbridge/intel/bd82x6x/smihandler.c index 250035c4c3..8fea33f5da 100644 --- a/src/southbridge/intel/bd82x6x/smihandler.c +++ b/src/southbridge/intel/bd82x6x/smihandler.c @@ -25,7 +25,6 @@ #include #include #include -#include #include #include #include @@ -44,15 +43,22 @@ /* While we read PMBASE dynamically in case it changed, let's * initialize it with a sane value */ -u16 pmbase = DEFAULT_PMBASE; -u8 smm_initialized = 0; +static u16 pmbase = DEFAULT_PMBASE; +u16 smm_get_pmbase(void) +{ + return pmbase; +} + +static u8 smm_initialized = 0; /* GNVS needs to be updated by an 0xEA PM Trap (B2) after it has been located * by coreboot. */ -global_nvs_t *gnvs = (global_nvs_t *)0x0; -void *tcg = (void *)0x0; -void *smi1 = (void *)0x0; +static global_nvs_t *gnvs = (global_nvs_t *)0x0; +global_nvs_t *smm_get_gnvs(void) +{ + return gnvs; +} #if CONFIG_SMM_TSEG static u32 tseg_base = 0; @@ -523,10 +529,7 @@ static void southbridge_smi_apmc(unsigned int node, smm_state_save_area_t *state return; } gnvs = *(global_nvs_t **)0x500; - tcg = *(void **)0x504; - smi1 = *(void **)0x508; smm_initialized = 1; - printk(BIOS_DEBUG, "SMI#: Setting up structures to %p, %p, %p\n", gnvs, tcg, smi1); break; #if CONFIG_ELOG_GSMI case ELOG_GSMI_APM_CNT: -- cgit v1.2.3