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security/intel/txt: Add and use DPR register layout 

This simplifies operations with this register's bitfields, and can also
be used by TXT-enabled platforms on the register in PCI config space.

Change-Id: I10a26bc8f4457158dd09e91d666fb29ad16a2087
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46050
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Angel Pons 2020-10-05 13:58:16 +02:00 committed by Patrick Georgi
parent 52082be9d6
commit 463e44bedb
2 changed files with 27 additions and 21 deletions
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25
src/security/intel/txt/ramstage.c
View File

@ -64,16 +64,14 @@ void bootmem_platform_add_ranges(void)
TXT_PUBLIC_SPACE - TXT_PRIVATE_SPACE,
BM_MEM_RESERVED);
const uint32_t txt_dev_memory = read32((void *)TXT_DPR) &
(TXT_DPR_TOP_ADDR_MASK << TXT_DPR_TOP_ADDR_SHIFT);
const uint32_t txt_dev_size =
(read32((void *)TXT_DPR) >> TXT_DPR_LOCK_SIZE_SHIFT) &
TXT_DPR_LOCK_SIZE_MASK;
const union dpr_register dpr = {
.raw = read32((void *)TXT_DPR),
};
const uint32_t dpr_base = dpr.top - dpr.size * MiB;
/* Chapter 5.5.6 Intel TXT Device Memory */
bootmem_add_range(txt_dev_memory - txt_dev_size * MiB,
txt_dev_size * MiB,
BM_MEM_RESERVED);
bootmem_add_range(dpr_base, dpr.size * MiB, BM_MEM_RESERVED);
}
static bool get_wake_error_status(void)
@ -228,12 +226,15 @@ static void lockdown_intel_txt(void *unused)
const u8 dpr_capable = !!(read64((void *)TXT_CAPABILITIES) &
TXT_CAPABILITIES_DPR);
printk(BIOS_INFO, "TEE-TXT: DPR capable %x\n", dpr_capable);
if (dpr_capable) {
if (dpr_capable) {
/* Protect 3 MiB below TSEG and lock register */
write64((void *)TXT_DPR, (TXT_DPR_TOP_ADDR(tseg) |
TXT_DPR_LOCK_SIZE(3) |
TXT_DPR_LOCK_MASK));
union dpr_register dpr = {
.lock = 1,
.size = 3,
.top = tseg,
};
write64((void *)TXT_DPR, dpr.raw);
// DPR TODO: implement SA_ENABLE_DPR in the intelblocks

23
src/security/intel/txt/txt_register.h
View File

@ -91,15 +91,6 @@
#define TXT_BIOSACM_ERRORCODE (TXT_BASE + 0x328)
#define TXT_DPR (TXT_BASE + 0x330)
#define TXT_DPR_LOCK_SHIFT 0
#define TXT_DPR_LOCK_SIZE_SHIFT 4
#define TXT_DPR_LOCK_SIZE_MASK 0xff
#define TXT_DPR_TOP_ADDR_SHIFT 20
#define TXT_DPR_TOP_ADDR_MASK 0xfff
#define TXT_DPR_LOCK_MASK (1 << TXT_DPR_LOCK_SHIFT)
#define TXT_DPR_LOCK_SIZE(x) ((x) << TXT_DPR_LOCK_SIZE_SHIFT)
#define TXT_DPR_TOP_ADDR(x) ((x) << TXT_DPR_TOP_ADDR_SHIFT)
#define TXT_ACM_KEY_HASH (TXT_BASE + 0x400)
#define TXT_ACM_KEY_HASH_LEN 0x4
@ -160,6 +151,20 @@
/* MSRs */
#define IA32_MCG_STATUS 0x17a
/* DPR register layout, either in PCI config space or TXT MMIO space */
union dpr_register {
struct {
uint32_t lock : 1; /* [ 0.. 0] */
uint32_t prs : 1; /* [ 1.. 1] and only present on PCI config */
uint32_t epm : 1; /* [ 2.. 2] and only present on PCI config */
uint32_t : 1;
uint32_t size : 8; /* [11.. 4] */
uint32_t : 8;
uint32_t top : 12; /* [31..20] */
};
uint32_t raw;
};
typedef enum {
CHIPSET_ACM = 2,
} acm_module_type;