From 057b6211bfba83caa9af3276fbbf8902cd1082a2 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 354/364] 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 | 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 07c90f7..09e9e57 100644

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

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

@@ -561,3 +561,66 @@ 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 ea8cd53..1f14826 100644

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

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

@@ -32,6 +32,9 @@

 #include <grub/i18n.h>

 #include <grub/charset.h>

 #include <grub/script_sh.h>

+#ifdef GRUB_MACHINE_IEEE1275

+#include <grub/ieee1275/ieee1275.h>

+#endif

 GRUB_MOD_LICENSE ("GPLv3+");

@@ -302,6 +305,22 @@ 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 686e1fa..7dcdab7 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.  */

@@ -872,6 +875,10 @@ grub_script_execute_sourcecode (const char *source, int argc, char **args)

   old_scope = scope;

   scope = &new_scope;

+#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 1b240d3..eabbe9b 100644

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

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

@@ -227,6 +227,8 @@ 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));)

-- 

1.8.1.4