grub2/0007-IBM-client-architecture-CAS-reboot-support.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Date: Thu, 20 Sep 2012 18:07:39 -0300
Subject: [PATCH] IBM client architecture (CAS) reboot support

This is an implementation of IBM client architecture (CAS) reboot for GRUB.

There are cases where the POWER firmware must reboot in order to support
specific features requested by a kernel. The kernel calls
ibm,client-architecture-support and it may either return or reboot with
the new feature set. eg:

Calling ibm,client-architecture-support.../
Elapsed time since release of system processors: 70959 mins 50 secs
Welcome to GRUB!

Instead of return to the GRUB menu, it will check if the flag for CAS
reboot is set. If so, grub will automatically boot the last booted
kernel using the same parameters

Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
[rharwood@redhat.com: commit message rewrap]
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
---
 grub-core/kern/ieee1275/openfw.c | 63 ++++++++++++++++++++++++++++++++++++++++
 grub-core/normal/main.c          | 19 ++++++++++++
 grub-core/script/execute.c       |  7 +++++
 include/grub/ieee1275/ieee1275.h |  2 ++
 4 files changed, 91 insertions(+)

diff --git a/grub-core/kern/ieee1275/openfw.c b/grub-core/kern/ieee1275/openfw.c
index 11b2beb2ff2..e2ecc65d2d8 100644
--- a/grub-core/kern/ieee1275/openfw.c
+++ b/grub-core/kern/ieee1275/openfw.c
@@ -591,3 +591,66 @@ grub_ieee1275_get_boot_dev (void)
 
   return bootpath;
 }
+
+/* Check if it's a CAS reboot. If so, set the script to be executed.  */
+int
+grub_ieee1275_cas_reboot (char *script)
+{
+  grub_uint32_t ibm_ca_support_reboot;
+  grub_uint32_t ibm_fw_nbr_reboots;
+  char property_value[10];
+  grub_ssize_t actual;
+  grub_ieee1275_ihandle_t options;
+
+  if (grub_ieee1275_finddevice ("/options", &options) < 0)
+    return -1;
+
+  /* Check two properties, one is enough to get cas reboot value */
+  ibm_ca_support_reboot = 0;
+  if (grub_ieee1275_get_integer_property (grub_ieee1275_chosen,
+                                          "ibm,client-architecture-support-reboot",
+                                          &ibm_ca_support_reboot,
+                                          sizeof (ibm_ca_support_reboot),
+                                          &actual) >= 0)
+    grub_dprintf("ieee1275", "ibm,client-architecture-support-reboot: %u\n",
+                 ibm_ca_support_reboot);
+
+  ibm_fw_nbr_reboots = 0;
+  if (grub_ieee1275_get_property (options, "ibm,fw-nbr-reboots",
+                                  property_value, sizeof (property_value),
+                                  &actual) >= 0)
+    {
+      property_value[sizeof (property_value) - 1] = 0;
+      ibm_fw_nbr_reboots = (grub_uint8_t) grub_strtoul (property_value, 0, 10);
+      grub_dprintf("ieee1275", "ibm,fw-nbr-reboots: %u\n", ibm_fw_nbr_reboots);
+    }
+
+  if (ibm_ca_support_reboot || ibm_fw_nbr_reboots)
+    {
+      if (! grub_ieee1275_get_property_length (options, "boot-last-label", &actual))
+        {
+          if (actual > 1024)
+            script = grub_realloc (script, actual + 1);
+          grub_ieee1275_get_property (options, "boot-last-label", script, actual,
+                                      &actual);
+          return 0;
+        }
+    }
+
+  grub_ieee1275_set_boot_last_label ("");
+
+  return -1;
+}
+
+int grub_ieee1275_set_boot_last_label (const char *text)
+{
+  grub_ieee1275_ihandle_t options;
+  grub_ssize_t actual;
+
+  grub_dprintf("ieee1275", "set boot_last_label (size: %u)\n", grub_strlen(text));
+  if (! grub_ieee1275_finddevice ("/options", &options) &&
+      options != (grub_ieee1275_ihandle_t) -1)
+    grub_ieee1275_set_property (options, "boot-last-label", text,
+                                grub_strlen (text), &actual);
+  return 0;
+}
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index bd44310005d..d3f53d93d87 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -34,6 +34,9 @@
 #include <grub/charset.h>
 #include <grub/script_sh.h>
 #include <grub/bufio.h>
+#ifdef GRUB_MACHINE_IEEE1275
+#include <grub/ieee1275/ieee1275.h>
+#endif
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -276,6 +279,22 @@ grub_normal_execute (const char *config, int nested, int batch)
     {
       menu = read_config_file (config);
 
+#ifdef GRUB_MACHINE_IEEE1275
+      int boot;
+      boot = 0;
+      char *script;
+      script = grub_malloc (1024);
+      if (! grub_ieee1275_cas_reboot (script))
+        {
+          char *dummy[1] = { NULL };
+          if (! grub_script_execute_sourcecode (script))
+            boot = 1;
+        }
+      grub_free (script);
+      if (boot)
+        grub_command_execute ("boot", 0, 0);
+#endif
+
       /* Ignore any error.  */
       grub_errno = GRUB_ERR_NONE;
     }
diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index 14ff09094f0..dab8fd2aeb0 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -28,6 +28,9 @@
 #include <grub/extcmd.h>
 #include <grub/i18n.h>
 #include <grub/verify.h>
+#ifdef GRUB_MACHINE_IEEE1275
+#include <grub/ieee1275/ieee1275.h>
+#endif
 
 /* Max digits for a char is 3 (0xFF is 255), similarly for an int it
    is sizeof (int) * 3, and one extra for a possible -ve sign.  */
@@ -883,6 +886,10 @@ grub_script_execute_sourcecode (const char *source)
   grub_err_t ret = 0;
   struct grub_script *parsed_script;
 
+#ifdef GRUB_MACHINE_IEEE1275
+  grub_ieee1275_set_boot_last_label (source);
+#endif
+
   while (source)
     {
       char *line;
diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
index dddb385149e..4f6e6aaa098 100644
--- a/include/grub/ieee1275/ieee1275.h
+++ b/include/grub/ieee1275/ieee1275.h
@@ -251,6 +251,8 @@ int EXPORT_FUNC(grub_ieee1275_devalias_next) (struct grub_ieee1275_devalias *ali
 void EXPORT_FUNC(grub_ieee1275_children_peer) (struct grub_ieee1275_devalias *alias);
 void EXPORT_FUNC(grub_ieee1275_children_first) (const char *devpath,
 						struct grub_ieee1275_devalias *alias);
+int EXPORT_FUNC(grub_ieee1275_cas_reboot) (char *script);
+int EXPORT_FUNC(grub_ieee1275_set_boot_last_label) (const char *text);
 
 char *EXPORT_FUNC(grub_ieee1275_get_boot_dev) (void);