Unit Tests For NVRAM Checking/Reading

This change introduces the unit tests for testing the ported
NVRAM checking and reading logic. nvram_format was also ported
to be able to format the test NVRAM "partition" to then run
the tests on it.

Change-Id: Idca01dc84d43caf0e32ba556b6407c78d66f053a
RTC: 192411
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/68612
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Nicholas E. Bofferding <bofferdn@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Roland Veloz <rveloz@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

4 files changed, 206 insertions, 7 deletions

diff --git a/src/usr/nvram/import/nvram-format.C b/src/usr/nvram/import/nvram-format.C
index d57f9ab51..072fb8f4d 100644
--- a/src/usr/nvram/import/nvram-format.C
+++ b/src/usr/nvram/import/nvram-format.C
@@ -25,13 +25,6 @@
 #include <skiboot.h>
 #include <nvram.h>
 
-struct chrp_nvram_hdr {
-    uint8_t     sig;
-    uint8_t     cksum;
-    be16        len;
-    char        name[12];
-};
-
 static struct chrp_nvram_hdr *skiboot_part_hdr;
 
 static uint8_t chrp_nv_cksum(struct chrp_nvram_hdr *hdr)
@@ -54,10 +47,82 @@ static uint8_t chrp_nv_cksum(struct chrp_nvram_hdr *hdr)
 
 #define NVRAM_SIG_FW_PRIV   0x51
 #define NVRAM_SIG_SYSTEM    0x70
+#define NVRAM_SIG_FREE      0x7f
 #define NVRAM_NAME_COMMON   "common"
 #define NVRAM_NAME_FW_PRIV  "ibm,skiboot"
+#define NVRAM_NAME_FREE     "wwwwwwwwwwww"
+#define NVRAM_SIZE_COMMON   0x10000
 #define NVRAM_SIZE_FW_PRIV  0x1000
 
+int nvram_format(void *nvram_image, uint32_t nvram_size)
+{
+    struct chrp_nvram_hdr *h;
+    unsigned int offset = 0;
+
+    prerror("NVRAM: Re-initializing (size: 0x%08x)\n", nvram_size);
+    memset(nvram_image, 0, nvram_size);
+
+    /* Create private partition */
+    if (nvram_size - offset < NVRAM_SIZE_FW_PRIV)
+        return -1;
+    h =
+#ifdef __HOSTBOOT_MODULE
+        reinterpret_cast<chrp_nvram_hdr*>(
+            static_cast<uint8_t*>(nvram_image) + offset);
+#else
+        nvram_image + offset;
+#endif
+    h->sig = NVRAM_SIG_FW_PRIV;
+    h->len = cpu_to_be16(NVRAM_SIZE_FW_PRIV >> 4);
+    strcpy(h->name, NVRAM_NAME_FW_PRIV);
+    h->cksum = chrp_nv_cksum(h);
+    prlog(PR_DEBUG, "NVRAM: Created '%s' partition at 0x%08x"
+          " for size 0x%08x with cksum 0x%02x\n",
+          NVRAM_NAME_FW_PRIV, offset,
+          be16_to_cpu(h->len), h->cksum);
+    offset += NVRAM_SIZE_FW_PRIV;
+
+    /* Create common partition */
+    if (nvram_size - offset < NVRAM_SIZE_COMMON)
+        return -1;
+    h =
+#ifdef __HOSTBOOT_MODULE
+        reinterpret_cast<chrp_nvram_hdr*>(
+            static_cast<uint8_t*>(nvram_image) + offset);
+#else
+        nvram_image + offset;
+#endif
+    h->sig = NVRAM_SIG_SYSTEM;
+    h->len = cpu_to_be16(NVRAM_SIZE_COMMON >> 4);
+    strcpy(h->name, NVRAM_NAME_COMMON);
+    h->cksum = chrp_nv_cksum(h);
+    prlog(PR_DEBUG, "NVRAM: Created '%s' partition at 0x%08x"
+          " for size 0x%08x with cksum 0x%02x\n",
+          NVRAM_NAME_COMMON, offset,
+          be16_to_cpu(h->len), h->cksum);
+    offset += NVRAM_SIZE_COMMON;
+
+    /* Create free space partition */
+    if (nvram_size - offset < sizeof(struct chrp_nvram_hdr))
+        return -1;
+    h =
+#ifdef __HOSTBOOT_MODULE
+        reinterpret_cast<chrp_nvram_hdr*>(
+            static_cast<uint8_t*>(nvram_image) + offset);
+#else
+        nvram_image + offset;
+#endif
+    h->sig = NVRAM_SIG_FREE;
+    h->len = cpu_to_be16((nvram_size - offset) >> 4);
+    /* We have the full 12 bytes here */
+    memcpy(h->name, NVRAM_NAME_FREE, 12);
+    h->cksum = chrp_nv_cksum(h);
+    prlog(PR_DEBUG, "NVRAM: Created '%s' partition at 0x%08x"
+          " for size 0x%08x with cksum 0x%02x\n",
+          NVRAM_NAME_FREE, offset, be16_to_cpu(h->len), h->cksum);
+    return 0;
+}
+
 static const char *find_next_key(const char *start, const char *end)
 {
     /*
diff --git a/src/usr/nvram/makefile b/src/usr/nvram/makefile
index 672e85529..74fea325f 100644
--- a/src/usr/nvram/makefile
+++ b/src/usr/nvram/makefile
@@ -34,4 +34,6 @@ OBJS += nvram-format.o
 
 VPATH += import
 
+SUBDIRS += test.d
+
 include ${ROOTPATH}/config.mk
diff --git a/src/usr/nvram/test/makefile b/src/usr/nvram/test/makefile
new file mode 100644
index 000000000..8b951863e
--- /dev/null
+++ b/src/usr/nvram/test/makefile
@@ -0,0 +1,32 @@
+# IBM_PROLOG_BEGIN_TAG
+# This is an automatically generated prolog.
+#
+# $Source: src/usr/nvram/test/makefile $
+#
+# OpenPOWER HostBoot Project
+#
+# Contributors Listed Below - COPYRIGHT 2018
+# [+] International Business Machines Corp.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# permissions and limitations under the License.
+#
+# IBM_PROLOG_END_TAG
+ROOTPATH = ../../../..
+
+MODULE = testnvram
+
+TESTS = testnvram.H
+
+include ${ROOTPATH}/config.mk
+
diff --git a/src/usr/nvram/test/testnvram.H b/src/usr/nvram/test/testnvram.H
new file mode 100644
index 000000000..88016ce95
--- /dev/null
+++ b/src/usr/nvram/test/testnvram.H
@@ -0,0 +1,100 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/nvram/test/testnvram.H $                              */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2018                             */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+#ifndef __TEST_NVRAM_H
+#define __TEST_NVRAM_H
+
+#include <cxxtest/TestSuite.H>
+#include <nvram/import/nvram.h>
+#include <stdlib.h>
+#include <string.h>
+
+class NvramTestSuite : public CxxTest::TestSuite
+{
+public:
+
+    void testNvram() const
+    {
+        TS_INFO(ENTER_MRK"testNvram");
+
+        const uint32_t NVRAM_SIZE = 0x90000;
+        uint8_t* l_nvramImg = static_cast<uint8_t*>(malloc(NVRAM_SIZE));
+
+        // Unformatted NVRAM - the check should fail
+        int l_rc = nvram_check(l_nvramImg, NVRAM_SIZE);
+        if(l_rc == 0)
+        {
+            TS_FAIL("testNvram: nvram_check returned clean on unformatted NVRAM");
+        }
+
+        // Format the memory area to look like NVRAM from skiboot perspective
+        l_rc = nvram_format(l_nvramImg, NVRAM_SIZE);
+        if(l_rc)
+        {
+            TS_FAIL("testNvram: could not nvram_format; rc = %d", l_rc);
+        }
+
+        // Now check it
+        l_rc = nvram_check(l_nvramImg, NVRAM_SIZE);
+        if(l_rc)
+        {
+            TS_FAIL("testNvram: nvram_check failed; rc = %d", l_rc);
+        }
+
+        char l_test_kv[] = "test=val";
+
+        // Insert the test K/V right after the header
+        memcpy(l_nvramImg + sizeof(chrp_nvram_hdr), l_test_kv,
+               sizeof(l_test_kv)/sizeof(l_test_kv[0]));
+
+        const char* l_key = "test";
+        const char* l_expectedVal = "val";
+        const char* l_val = nvram_query(l_key);
+        if(!l_val)
+        {
+            TS_FAIL("testNvram: test key not found!");
+        }
+        else
+        {
+            if(strcmp(l_val, l_expectedVal))
+            {
+                TS_FAIL("testNvram: unexpected test value returned. Expected \"%s\", actual \"%s\"", l_expectedVal, l_val);
+            }
+        }
+
+        const char* l_notExistingKey = "key_dne";
+        l_val = nvram_query(l_notExistingKey);
+        if(l_val)
+        {
+            TS_FAIL("testNvram: non-existing key found!");
+        }
+
+        free(l_nvramImg);
+        l_nvramImg = nullptr;
+
+        TS_INFO(EXIT_MRK"testNvram");
+    }
+};
+
+#endif