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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
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Date: Thu, 20 Sep 2012 18:07:39 -0300
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Subject: [PATCH] IBM client architecture (CAS) reboot support
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This is an implementation of IBM client architecture (CAS) reboot for GRUB.
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There are cases where the POWER firmware must reboot in order to support
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specific features requested by a kernel. The kernel calls
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ibm,client-architecture-support and it may either return or reboot with the new
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feature set. eg:
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Calling ibm,client-architecture-support.../
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Elapsed time since release of system processors: 70959 mins 50 secs
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Welcome to GRUB!
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Instead of return to the GRUB menu, it will check if the flag for CAS reboot is
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set. If so, grub will automatically boot the last booted kernel using the same
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parameters
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---
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 grub-core/kern/ieee1275/openfw.c | 63 ++++++++++++++++++++++++++++++++++++++++
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 grub-core/normal/main.c          | 19 ++++++++++++
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 grub-core/script/execute.c       |  7 +++++
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 include/grub/ieee1275/ieee1275.h |  2 ++
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 4 files changed, 91 insertions(+)
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diff --git a/grub-core/kern/ieee1275/openfw.c b/grub-core/kern/ieee1275/openfw.c
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index 62929d983bf..2d53c0e8608 100644
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--- a/grub-core/kern/ieee1275/openfw.c
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+++ b/grub-core/kern/ieee1275/openfw.c
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@@ -588,3 +588,66 @@ grub_ieee1275_get_boot_dev (void)
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   return bootpath;
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 }
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+
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+/* Check if it's a CAS reboot. If so, set the script to be executed.  */
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+int
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+grub_ieee1275_cas_reboot (char *script)
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+{
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+  grub_uint32_t ibm_ca_support_reboot;
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+  grub_uint32_t ibm_fw_nbr_reboots;
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+  char property_value[10];
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+  grub_ssize_t actual;
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+  grub_ieee1275_ihandle_t options;
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+
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+  if (grub_ieee1275_finddevice ("/options", &options) < 0)
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+    return -1;
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+
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+  /* Check two properties, one is enough to get cas reboot value */
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+  ibm_ca_support_reboot = 0;
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+  if (grub_ieee1275_get_integer_property (grub_ieee1275_chosen,
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+                                          "ibm,client-architecture-support-reboot",
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+                                          &ibm_ca_support_reboot,
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+                                          sizeof (ibm_ca_support_reboot),
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+                                          &actual) >= 0)
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+    grub_dprintf("ieee1275", "ibm,client-architecture-support-reboot: %u\n",
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+                 ibm_ca_support_reboot);
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+
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+  ibm_fw_nbr_reboots = 0;
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+  if (grub_ieee1275_get_property (options, "ibm,fw-nbr-reboots",
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+                                  property_value, sizeof (property_value),
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+                                  &actual) >= 0)
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+    {
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+      property_value[sizeof (property_value) - 1] = 0;
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+      ibm_fw_nbr_reboots = (grub_uint8_t) grub_strtoul (property_value, 0, 10);
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+      grub_dprintf("ieee1275", "ibm,fw-nbr-reboots: %u\n", ibm_fw_nbr_reboots);
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+    }
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+
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+  if (ibm_ca_support_reboot || ibm_fw_nbr_reboots)
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+    {
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+      if (! grub_ieee1275_get_property_length (options, "boot-last-label", &actual))
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+        {
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+          if (actual > 1024)
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+            script = grub_realloc (script, actual + 1);
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+          grub_ieee1275_get_property (options, "boot-last-label", script, actual,
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+                                      &actual);
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+          return 0;
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+        }
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+    }
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+
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+  grub_ieee1275_set_boot_last_label ("");
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+
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+  return -1;
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+}
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+
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+int grub_ieee1275_set_boot_last_label (const char *text)
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+{
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+  grub_ieee1275_ihandle_t options;
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+  grub_ssize_t actual;
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+
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+  grub_dprintf("ieee1275", "set boot_last_label (size: %u)\n", grub_strlen(text));
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+  if (! grub_ieee1275_finddevice ("/options", &options) &&
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+      options != (grub_ieee1275_ihandle_t) -1)
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+    grub_ieee1275_set_property (options, "boot-last-label", text,
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+                                grub_strlen (text), &actual);
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+  return 0;
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+}
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diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
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index 78a70a8bf47..249e19bc788 100644
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--- a/grub-core/normal/main.c
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+++ b/grub-core/normal/main.c
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@@ -33,6 +33,9 @@
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 #include <grub/charset.h>
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 #include <grub/script_sh.h>
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 #include <grub/bufio.h>
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+#ifdef GRUB_MACHINE_IEEE1275
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+#include <grub/ieee1275/ieee1275.h>
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+#endif
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 GRUB_MOD_LICENSE ("GPLv3+");
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@@ -275,6 +278,22 @@ grub_normal_execute (const char *config, int nested, int batch)
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     {
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       menu = read_config_file (config);
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+#ifdef GRUB_MACHINE_IEEE1275
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+      int boot;
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+      boot = 0;
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+      char *script;
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+      script = grub_malloc (1024);
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+      if (! grub_ieee1275_cas_reboot (script))
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+        {
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+          char *dummy[1] = { NULL };
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+          if (! grub_script_execute_sourcecode (script))
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+            boot = 1;
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+        }
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+      grub_free (script);
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+      if (boot)
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+        grub_command_execute ("boot", 0, 0);
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+#endif
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+
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       /* Ignore any error.  */
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       grub_errno = GRUB_ERR_NONE;
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     }
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diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
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index a8502d90711..ab78ca87f90 100644
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--- a/grub-core/script/execute.c
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+++ b/grub-core/script/execute.c
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@@ -27,6 +27,9 @@
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 #include <grub/normal.h>
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 #include <grub/extcmd.h>
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 #include <grub/i18n.h>
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+#ifdef GRUB_MACHINE_IEEE1275
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+#include <grub/ieee1275/ieee1275.h>
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+#endif
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 /* Max digits for a char is 3 (0xFF is 255), similarly for an int it
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    is sizeof (int) * 3, and one extra for a possible -ve sign.  */
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@@ -877,6 +880,10 @@ grub_script_execute_sourcecode (const char *source)
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   grub_err_t ret = 0;
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   struct grub_script *parsed_script;
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+#ifdef GRUB_MACHINE_IEEE1275
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+  grub_ieee1275_set_boot_last_label (source);
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+#endif
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+
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   while (source)
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     {
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       char *line;
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diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
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index 8868f3a756f..2310f33dbc2 100644
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--- a/include/grub/ieee1275/ieee1275.h
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+++ b/include/grub/ieee1275/ieee1275.h
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@@ -252,6 +252,8 @@ int EXPORT_FUNC(grub_ieee1275_devalias_next) (struct grub_ieee1275_devalias *ali
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 void EXPORT_FUNC(grub_ieee1275_children_peer) (struct grub_ieee1275_devalias *alias);
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 void EXPORT_FUNC(grub_ieee1275_children_first) (const char *devpath,
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 						struct grub_ieee1275_devalias *alias);
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+int EXPORT_FUNC(grub_ieee1275_cas_reboot) (char *script);
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+int EXPORT_FUNC(grub_ieee1275_set_boot_last_label) (const char *text);
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 char *EXPORT_FUNC(grub_ieee1275_get_boot_dev) (void);
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