1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <assert.h>
4 #include <commonlib/helpers.h>
5 #include <console/console.h>
6 #include <cpu/x86/smm.h>
7 #include <stage_cache.h>
8 #include <types.h>
9 #include <inttypes.h>
10
11 /*
12 * Subregions within SMM
13 * +-------------------------+
14 * | IED | IED_REGION_SIZE
15 * +-------------------------+
16 * | External Stage Cache | SMM_RESERVED_SIZE
17 * +-------------------------+
18 * | code and data |
19 * | (TSEG) |
20 * +-------------------------+ TSEG
21 */
smm_subregion(int sub,uintptr_t * start,size_t * size)22 int smm_subregion(int sub, uintptr_t *start, size_t *size)
23 {
24 uintptr_t sub_base;
25 size_t sub_size;
26 const size_t ied_size = CONFIG_IED_REGION_SIZE;
27 const size_t cache_size = CONFIG_SMM_RESERVED_SIZE;
28
29 if (CONFIG(SMM_TSEG))
30 smm_region(&sub_base, &sub_size);
31 else if (CONFIG(SMM_ASEG))
32 aseg_region(&sub_base, &sub_size);
33 else
34 return -1;
35
36 ASSERT(IS_ALIGNED(sub_base, sub_size));
37 ASSERT(sub_size > (cache_size + ied_size));
38
39 switch (sub) {
40 case SMM_SUBREGION_HANDLER:
41 /* Handler starts at the base of TSEG. */
42 sub_size -= ied_size;
43 sub_size -= cache_size;
44 break;
45 case SMM_SUBREGION_CACHE:
46 /* External cache is in the middle of TSEG. */
47 sub_base += sub_size - (ied_size + cache_size);
48 sub_size = cache_size;
49 break;
50 case SMM_SUBREGION_CHIPSET:
51 /* IED is at the top. */
52 sub_base += sub_size - ied_size;
53 sub_size = ied_size;
54 break;
55 default:
56 *start = 0;
57 *size = 0;
58 return -1;
59 }
60
61 *start = sub_base;
62 *size = sub_size;
63 return 0;
64 }
65
stage_cache_external_region(void ** base,size_t * size)66 void stage_cache_external_region(void **base, size_t *size)
67 {
68 if (smm_subregion(SMM_SUBREGION_CACHE, (uintptr_t *)base, size)) {
69 printk(BIOS_ERR, "No cache SMM subregion.\n");
70 *base = NULL;
71 *size = 0;
72 }
73 }
74
smm_list_regions(void)75 void smm_list_regions(void)
76 {
77 uintptr_t base;
78 size_t size;
79 int i;
80
81 smm_region(&base, &size);
82 if (!size)
83 return;
84
85 printk(BIOS_DEBUG, "SMM Memory Map\n");
86 printk(BIOS_DEBUG, "SMRAM : 0x%" PRIxPTR " 0x%zx\n", base, size);
87
88 for (i = 0; i < SMM_SUBREGION_NUM; i++) {
89 if (smm_subregion(i, &base, &size))
90 continue;
91 printk(BIOS_DEBUG, " Subregion %d: 0x%" PRIxPTR " 0x%zx\n", i, base, size);
92 }
93 }
94