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cr50: add vendor command to get wp setting

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When debugging HW write protect you can use the AP to tell what the
actual HW write protect setting is, but you can't tell what cr50 thinks
the HW write protect setting is. This change adds cr50 support for
getting the HW write protect using a vendor command.

This adds 98 bytes

BUG=b:77543904
BRANCH=cr50
TEST=none

Change-Id: I7410ecca557ad1fcf78e521623c4444b452fbc42
Signed-off-by: Mary Ruthven <mruthven@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1060641
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>
This commit is contained in:
Mary Ruthven
2018-05-15 19:02:38 -07:00
committed by chrome-bot
parent e04ee44c13
commit b67ef05de0
2 changed files with 44 additions and 0 deletions
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29
board/cr50/wp.c
View File

@@ -107,6 +107,35 @@ static void force_write_protect(int force, int wp_en)
set_wp_state(wp_en);
}
static enum vendor_cmd_rc vc_set_wp(enum vendor_cmd_cc code,
void *buf,
size_t input_size,
size_t *response_size)
{
uint8_t response = 0;
*response_size = 0;
/* There shouldn't be any args */
if (input_size)
return VENDOR_RC_BOGUS_ARGS;
/* Get current wp settings */
if (GREG32(PMU, LONG_LIFE_SCRATCH1) & BOARD_FORCING_WP)
response |= WPV_FORCE;
if (get_wp_state())
response |= WPV_ENABLE;
/* Get atboot wp settings */
if (ccd_get_flag(CCD_FLAG_OVERRIDE_WP_AT_BOOT)) {
response |= WPV_ATBOOT_SET;
if (ccd_get_flag(CCD_FLAG_OVERRIDE_WP_STATE_ENABLED))
response |= WPV_ATBOOT_ENABLE;
}
((uint8_t *)buf)[0] = response;
*response_size = sizeof(response);
return VENDOR_RC_SUCCESS;
}
DECLARE_VENDOR_COMMAND(VENDOR_CC_WP, vc_set_wp);
static int command_wp(int argc, char **argv)
{
int val = 1;

15
include/tpm_vendor_cmds.h
View File

@@ -63,6 +63,12 @@ enum vendor_cmd_cc {
* the 'ccd reset' console command is run.
*/
VENDOR_CC_RESET_FACTORY = 38,
/*
* Get the write protect setting. This will return a single byte with
* bits communicating the write protect setting as described by the
* WPV subcommands.
*/
VENDOR_CC_WP = 39,
LAST_VENDOR_COMMAND = 65535,
};
@@ -154,4 +160,13 @@ struct vendor_cc_spi_hash_request {
/* Maximum size of a response = SHA-256 hash or 1-32 bytes of data */
#define SPI_HASH_MAX_RESPONSE_BYTES 32
/*
* Subcommand code, used to set write protect.
*/
#define WPV_UPDATE (1 << 0)
#define WPV_ENABLE (1 << 1)
#define WPV_FORCE (1 << 2)
#define WPV_ATBOOT_SET (1 << 3)
#define WPV_ATBOOT_ENABLE (1 << 4)
#endif /* __INCLUDE_TPM_VENDOR_CMDS_H */