From 109deee22dfe7c1694d12e3f07823607ecb55dbf 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 049/272] 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          | 18 +++++++++
 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 cba4da5a0..af3d844c0 100644
--- a/grub-core/kern/ieee1275/openfw.c
+++ b/grub-core/kern/ieee1275/openfw.c
@@ -593,6 +593,69 @@ 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: %" PRIxGRUB_SIZE ")\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;
+}
+
 char *
 grub_ieee1275_get_boot_dev (void)
 {
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index bd4431000..baa63b2ed 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 +279,21 @@ 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))
+        {
+          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 14ff09094..dab8fd2ae 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 362c8bece..a99bb210f 100644
--- a/include/grub/ieee1275/ieee1275.h
+++ b/include/grub/ieee1275/ieee1275.h
@@ -260,6 +260,8 @@ 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);
 
-- 
2.41.0