Raul E Rangel | 899be1b | 2021-02-05 15:50:20 -0700 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
Felix Held | 6e2f5f2 | 2021-02-08 18:16:07 +0100 | [diff] [blame^] | 3 | #include <amdblocks/memmap.h> |
Raul E Rangel | 899be1b | 2021-02-05 15:50:20 -0700 | [diff] [blame] | 4 | #include <console/console.h> |
| 5 | #include <cbmem.h> |
Felix Held | 6e2f5f2 | 2021-02-08 18:16:07 +0100 | [diff] [blame^] | 6 | #include <cpu/amd/msr.h> |
| 7 | #include <cpu/x86/smm.h> |
| 8 | #include <fsp/util.h> |
| 9 | #include <FspGuids.h> |
| 10 | #include <memrange.h> |
| 11 | #include <stdint.h> |
Raul E Rangel | 899be1b | 2021-02-05 15:50:20 -0700 | [diff] [blame] | 12 | |
| 13 | void memmap_stash_early_dram_usage(void) |
| 14 | { |
| 15 | struct memmap_early_dram *e; |
| 16 | |
| 17 | e = cbmem_add(CBMEM_ID_CB_EARLY_DRAM, sizeof(*e)); |
| 18 | |
| 19 | if (!e) |
| 20 | die("ERROR: Failed to stash early dram usage!\n"); |
| 21 | |
| 22 | e->base = (uint32_t)(uintptr_t)_early_reserved_dram; |
| 23 | e->size = REGION_SIZE(early_reserved_dram); |
| 24 | } |
| 25 | |
| 26 | const struct memmap_early_dram *memmap_get_early_dram_usage(void) |
| 27 | { |
| 28 | struct memmap_early_dram *e = cbmem_find(CBMEM_ID_CB_EARLY_DRAM); |
| 29 | |
| 30 | if (!e) |
| 31 | die("ERROR: Failed to read early dram usage!\n"); |
| 32 | |
| 33 | return e; |
| 34 | } |
Felix Held | 6e2f5f2 | 2021-02-08 18:16:07 +0100 | [diff] [blame^] | 35 | |
| 36 | /* |
| 37 | * For data stored in TSEG, ensure TValid is clear so R/W access can reach |
| 38 | * the DRAM when not in SMM. |
| 39 | */ |
| 40 | static void clear_tvalid(void) |
| 41 | { |
| 42 | msr_t hwcr = rdmsr(HWCR_MSR); |
| 43 | msr_t mask = rdmsr(SMM_MASK_MSR); |
| 44 | int tvalid = !!(mask.lo & SMM_TSEG_VALID); |
| 45 | |
| 46 | if (hwcr.lo & SMM_LOCK) { |
| 47 | if (!tvalid) /* not valid but locked means still accessible */ |
| 48 | return; |
| 49 | |
| 50 | printk(BIOS_ERR, "Error: can't clear TValid, already locked\n"); |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | mask.lo &= ~SMM_TSEG_VALID; |
| 55 | wrmsr(SMM_MASK_MSR, mask); |
| 56 | } |
| 57 | |
| 58 | void smm_region(uintptr_t *start, size_t *size) |
| 59 | { |
| 60 | static int once; |
| 61 | struct range_entry tseg; |
| 62 | int status; |
| 63 | |
| 64 | *start = 0; |
| 65 | *size = 0; |
| 66 | |
| 67 | status = fsp_find_range_hob(&tseg, AMD_FSP_TSEG_HOB_GUID.b); |
| 68 | |
| 69 | if (status < 0) { |
| 70 | printk(BIOS_ERR, "Error: unable to find TSEG HOB\n"); |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | *start = (uintptr_t)range_entry_base(&tseg); |
| 75 | *size = range_entry_size(&tseg); |
| 76 | |
| 77 | if (!once) { |
| 78 | clear_tvalid(); |
| 79 | once = 1; |
| 80 | } |
| 81 | } |