<p>Joel Kitching has uploaded this change for <strong>review</strong>.</p><p><a href="https://review.coreboot.org/29026">View Change</a></p><pre style="font-family: monospace,monospace; white-space: pre-wrap;">tpm: clean up tpm_setup function flow<br><br>Introduce two helper functions for more readable code.<br><br>BUG=None<br>TEST=None<br><br>Change-Id: Ibea44880683a301e82ee2ba049003c36fcb44eba<br>Signed-off-by: Joel Kitching <kitching@google.com><br>---<br>M src/security/tpm/tspi/tspi.c<br>1 file changed, 37 insertions(+), 25 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">git pull ssh://review.coreboot.org:29418/coreboot refs/changes/26/29026/1</pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/src/security/tpm/tspi/tspi.c b/src/security/tpm/tspi/tspi.c</span><br><span>index e882857..73722bd 100644</span><br><span>--- a/src/security/tpm/tspi/tspi.c</span><br><span>+++ b/src/security/tpm/tspi/tspi.c</span><br><span>@@ -64,6 +64,41 @@</span><br><span> }</span><br><span> #endif</span><br><span> </span><br><span style="color: hsl(120, 100%, 40%);">+static uint32_t tpm_setup_epilogue(uint32_t result)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ if (result != TPM_SUCCESS)</span><br><span style="color: hsl(120, 100%, 40%);">+ post_code(POST_TPM_FAILURE);</span><br><span style="color: hsl(120, 100%, 40%);">+ else</span><br><span style="color: hsl(120, 100%, 40%);">+ printk(BIOS_INFO, "TPM: setup succeeded\n");</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ return result;</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+static uint32_t tpm_setup_s3_helper(void)</span><br><span style="color: hsl(120, 100%, 40%);">+{</span><br><span style="color: hsl(120, 100%, 40%);">+ result = tlcl_resume();</span><br><span style="color: hsl(120, 100%, 40%);">+ switch (result) {</span><br><span style="color: hsl(120, 100%, 40%);">+ case TPM_SUCCESS:</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ case TPM_E_INVALID_POSTINIT:</span><br><span style="color: hsl(120, 100%, 40%);">+ /*</span><br><span style="color: hsl(120, 100%, 40%);">+ * We're on a platform where the TPM maintains power</span><br><span style="color: hsl(120, 100%, 40%);">+ * in S3, so it's already initialized.</span><br><span style="color: hsl(120, 100%, 40%);">+ */</span><br><span style="color: hsl(120, 100%, 40%);">+ printk(BIOS_INFO, "TPM: Already initialized.\n");</span><br><span style="color: hsl(120, 100%, 40%);">+ result = TPM_SUCCESS;</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ default:</span><br><span style="color: hsl(120, 100%, 40%);">+ printk(BIOS_ERR, "TPM: Resume failed (%d).\n", result);</span><br><span style="color: hsl(120, 100%, 40%);">+ break;</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ }</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span style="color: hsl(120, 100%, 40%);">+ return result;</span><br><span style="color: hsl(120, 100%, 40%);">+}</span><br><span style="color: hsl(120, 100%, 40%);">+</span><br><span> /*</span><br><span> * tpm_setup starts the TPM and establishes the root of trust for the</span><br><span> * anti-rollback mechanism. SetupTPM can fail for three reasons. 1 A bug. 2 a</span><br><span>@@ -96,25 +131,7 @@</span><br><span> </span><br><span> /* Handle special init for S3 resume path */</span><br><span> if (s3flag) {</span><br><span style="color: hsl(0, 100%, 40%);">- result = tlcl_resume();</span><br><span style="color: hsl(0, 100%, 40%);">- switch (result) {</span><br><span style="color: hsl(0, 100%, 40%);">- case TPM_SUCCESS:</span><br><span style="color: hsl(0, 100%, 40%);">- break;</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- case TPM_E_INVALID_POSTINIT:</span><br><span style="color: hsl(0, 100%, 40%);">- /*</span><br><span style="color: hsl(0, 100%, 40%);">- * We're on a platform where the TPM maintains power</span><br><span style="color: hsl(0, 100%, 40%);">- * in S3, so it's already initialized.</span><br><span style="color: hsl(0, 100%, 40%);">- */</span><br><span style="color: hsl(0, 100%, 40%);">- printk(BIOS_INFO, "TPM: Already initialized.\n");</span><br><span style="color: hsl(0, 100%, 40%);">- result = TPM_SUCCESS;</span><br><span style="color: hsl(0, 100%, 40%);">- break;</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- default:</span><br><span style="color: hsl(0, 100%, 40%);">- printk(BIOS_ERR, "TPM: Resume failed.\n");</span><br><span style="color: hsl(0, 100%, 40%);">- break;</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- }</span><br><span style="color: hsl(120, 100%, 40%);">+ result = tpm_setup_s3_helper();</span><br><span> goto out;</span><br><span> }</span><br><span> </span><br><span>@@ -154,12 +171,7 @@</span><br><span> #endif</span><br><span> </span><br><span> out:</span><br><span style="color: hsl(0, 100%, 40%);">- if (result != TPM_SUCCESS)</span><br><span style="color: hsl(0, 100%, 40%);">- post_code(POST_TPM_FAILURE);</span><br><span style="color: hsl(0, 100%, 40%);">- else</span><br><span style="color: hsl(0, 100%, 40%);">- printk(BIOS_INFO, "TPM: setup succeeded\n");</span><br><span style="color: hsl(0, 100%, 40%);">-</span><br><span style="color: hsl(0, 100%, 40%);">- return result;</span><br><span style="color: hsl(120, 100%, 40%);">+ return tpm_setup_epilogue(result);</span><br><span> }</span><br><span> </span><br><span> uint32_t tpm_clear_and_reenable(void)</span><br><span></span><br></pre><p>To view, visit <a href="https://review.coreboot.org/29026">change 29026</a>. 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<div style="display:none"> Gerrit-Project: coreboot </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-MessageType: newchange </div>
<div style="display:none"> Gerrit-Change-Id: Ibea44880683a301e82ee2ba049003c36fcb44eba </div>
<div style="display:none"> Gerrit-Change-Number: 29026 </div>
<div style="display:none"> Gerrit-PatchSet: 1 </div>
<div style="display:none"> Gerrit-Owner: Joel Kitching <kitching@google.com> </div>