diff options
Diffstat (limited to 'src/soc/amd/common/block')
| -rw-r--r-- | src/soc/amd/common/block/cpu/noncar/memmap.c | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/src/soc/amd/common/block/cpu/noncar/memmap.c b/src/soc/amd/common/block/cpu/noncar/memmap.c index 9efe959d4d..470b51785e 100644 --- a/src/soc/amd/common/block/cpu/noncar/memmap.c +++ b/src/soc/amd/common/block/cpu/noncar/memmap.c @@ -1,9 +1,14 @@ /* SPDX-License-Identifier: GPL-2.0-only */ -#include <stdint.h> +#include <amdblocks/memmap.h> #include <console/console.h> #include <cbmem.h> -#include <amdblocks/memmap.h> +#include <cpu/amd/msr.h> +#include <cpu/x86/smm.h> +#include <fsp/util.h> +#include <FspGuids.h> +#include <memrange.h> +#include <stdint.h> void memmap_stash_early_dram_usage(void) { @@ -27,3 +32,50 @@ const struct memmap_early_dram *memmap_get_early_dram_usage(void) return e; } + +/* + * For data stored in TSEG, ensure TValid is clear so R/W access can reach + * the DRAM when not in SMM. + */ +static void clear_tvalid(void) +{ + msr_t hwcr = rdmsr(HWCR_MSR); + msr_t mask = rdmsr(SMM_MASK_MSR); + int tvalid = !!(mask.lo & SMM_TSEG_VALID); + + if (hwcr.lo & SMM_LOCK) { + if (!tvalid) /* not valid but locked means still accessible */ + return; + + printk(BIOS_ERR, "Error: can't clear TValid, already locked\n"); + return; + } + + mask.lo &= ~SMM_TSEG_VALID; + wrmsr(SMM_MASK_MSR, mask); +} + +void smm_region(uintptr_t *start, size_t *size) +{ + static int once; + struct range_entry tseg; + int status; + + *start = 0; + *size = 0; + + status = fsp_find_range_hob(&tseg, AMD_FSP_TSEG_HOB_GUID.b); + + if (status < 0) { + printk(BIOS_ERR, "Error: unable to find TSEG HOB\n"); + return; + } + + *start = (uintptr_t)range_entry_base(&tseg); + *size = range_entry_size(&tseg); + + if (!once) { + clear_tvalid(); + once = 1; + } +} |