From a0103db268b36f4c772643afaf818d719143edda Mon Sep 17 00:00:00 2001 From: Paulo Flabiano Smorigo Date: Thu, 20 Sep 2012 18:07:39 -0300 Subject: [PATCH 051/176] 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 ddb778340..6db8b9865 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 78a70a8bf..249e19bc7 100644 --- a/grub-core/normal/main.c +++ b/grub-core/normal/main.c @@ -33,6 +33,9 @@ #include #include #include +#ifdef GRUB_MACHINE_IEEE1275 +#include +#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)) + 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 a8502d907..ab78ca87f 100644 --- a/grub-core/script/execute.c +++ b/grub-core/script/execute.c @@ -27,6 +27,9 @@ #include #include #include +#ifdef GRUB_MACHINE_IEEE1275 +#include +#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. */ @@ -877,6 +880,10 @@ 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 8e4251303..9f26c69a2 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));) -- 2.13.0