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sandbox: tpm: Track whether the state is valid

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Add checking as to whether the current TPM state is valid, so we can
implement reading/writing the state.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-07-18 14:18:02 -06:00
parent 46aed06cb7
commit 0c0ddada65
1 changed files with 8 additions and 2 deletions
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10
drivers/tpm/tpm2_tis_sandbox.c
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@ -49,6 +49,7 @@ static const u8 sandbox_extended_once_pcr[] = {
* Information about our TPM emulation. This is preserved in the sandbox
* state file if enabled.
*
* @valid: true if this is valid (only used in s_state)
* @init_done: true if open() has been called
* @startup_done: true if TPM2_CC_STARTUP has been processed
* @tests_done: true if TPM2_CC_SELF_TEST has be processed
@ -62,6 +63,7 @@ static const u8 sandbox_extended_once_pcr[] = {
* @nvdata: non-volatile data, used to store important things for the platform
*/
struct sandbox_tpm2 {
bool valid;
/* TPM internal states */
bool init_done;
bool startup_done;
@ -73,6 +75,8 @@ struct sandbox_tpm2 {
u32 pcr_extensions[SANDBOX_TPM_PCR_NB];
};
static struct sandbox_tpm2 s_state, *g_state;
/*
* Check the tag validity depending on the command (authentication required or
* not). If authentication is required, check it is valid. Update the auth
@ -606,11 +610,13 @@ static int sandbox_tpm2_probe(struct udevice *dev)
/* Use the TPM v2 stack */
priv->version = TPM_V2;
memset(tpm, 0, sizeof(*tpm));
priv->pcr_count = 32;
priv->pcr_select_min = 2;
if (s_state.valid)
memcpy(tpm, &s_state, sizeof(*tpm));
g_state = tpm;
return 0;
}