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

---

 grub-core/kern/ieee1275/openfw.c | 62 ++++++++++++++++++++++++++++++++++++++++

 grub-core/normal/main.c          | 19 ++++++++++++

 grub-core/script/execute.c       |  7 +++++

 include/grub/ieee1275/ieee1275.h |  2 ++

 4 files changed, 90 insertions(+)

diff --git a/grub-core/kern/ieee1275/openfw.c b/grub-core/kern/ieee1275/openfw.c

index ddb778340e4..6db8b986551 100644

--- a/grub-core/kern/ieee1275/openfw.c

+++ b/grub-core/kern/ieee1275/openfw.c

@@ -561,3 +561,65 @@ grub_ieee1275_canonicalise_devname (const char *path)

   return NULL;

 }

+/* 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 6f4970f71c1..f72844c9f37 100644

--- a/grub-core/normal/main.c

+++ b/grub-core/normal/main.c

@@ -33,6 +33,9 @@

 #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+");

@@ -275,6 +278,22 @@ 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, 0, dummy))

+            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 8f01c1bbfa2..cec9539a47c 100644

--- a/grub-core/script/execute.c

+++ b/grub-core/script/execute.c

@@ -27,6 +27,9 @@

 #include <grub/normal.h>

 #include <grub/extcmd.h>

 #include <grub/i18n.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.  */

@@ -892,6 +895,10 @@ 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 8e425130327..9f26c69a2df 100644

--- a/include/grub/ieee1275/ieee1275.h

+++ b/include/grub/ieee1275/ieee1275.h

@@ -234,6 +234,8 @@ 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);

 #define FOR_IEEE1275_DEVALIASES(alias) for (grub_ieee1275_devalias_init_iterator (&(alias)); grub_ieee1275_devalias_next (&(alias));)