platforms/powerpc: Add support for OPAL sysparams

[petitboot] / discover / platform-powerpc.c

diff --git a/discover/platform-powerpc.c b/discover/platform-powerpc.c
index 776176956a8c9df777948728a9fcc15660998e2e..4eb28057c9fb6c7513a05c315cda8599c71cdc7c 100644 (file)
--- a/discover/platform-powerpc.c
+++ b/discover/platform-powerpc.c
@@ -1,9 +1,11 @@
 
+#include <assert.h>
 #include <string.h>
 #include <stdlib.h>
 #include <limits.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <sys/fcntl.h>
 #include <sys/stat.h>
 
 #include <talloc/talloc.h>
@@ -14,6 +16,7 @@
 #include "platform.h"
 
 static const char *partition = "common";
+static const char *sysparams_dir = "/sys/firmware/opal/sysparams";
 
 struct param {
        char                    *name;
@@ -504,6 +507,103 @@ static int update_config(struct platform_powerpc *platform,
        return write_nvram(platform);
 }
 
+static void set_exclusive_devtype(struct config *config,
+               enum device_type devtype)
+{
+       config->n_boot_priorities = 2;
+       config->boot_priorities = talloc_realloc(config,
+                       config->boot_priorities, struct boot_priority,
+                       config->n_boot_priorities);
+       config->boot_priorities[0].type = devtype;
+       config->boot_priorities[0].priority = 0;
+       config->boot_priorities[1].type = DEVICE_TYPE_ANY;
+       config->boot_priorities[1].priority = -1;
+}
+
+/* bootdev options that we recognise */
+enum ipmi_bootdev {
+       IPMI_BOOTDEV_NONE = 0x00,
+       IPMI_BOOTDEV_NETWORK = 0x01,
+       IPMI_BOOTDEV_DISK = 0x2,
+       IPMI_BOOTDEV_CDROM = 0x5,
+       IPMI_BOOTDEV_SETUP = 0x6,
+};
+
+static int read_bootdev_sysparam(const char *name, uint8_t *val)
+{
+       uint8_t buf[2];
+       char path[50];
+       int fd, rc;
+
+       strcpy(path, sysparams_dir);
+       assert(strlen(name) < sizeof(path) - strlen(path));
+       strcat(path, name);
+
+       fd = open(path, O_RDONLY);
+       if (fd < 0)
+               return -1;
+
+       rc = read(fd, buf, sizeof(buf));
+
+       close(fd);
+
+       /* bootdev definitions should only be one byte in size */
+       if (rc != 1)
+               return -1;
+
+       switch (buf[0]) {
+       default:
+               return -1;
+       case IPMI_BOOTDEV_NONE:
+       case IPMI_BOOTDEV_NETWORK:
+       case IPMI_BOOTDEV_DISK:
+       case IPMI_BOOTDEV_CDROM:
+       case IPMI_BOOTDEV_SETUP:
+               *val = buf[0];
+       }
+
+       return 0;
+}
+
+static void parse_opal_sysparams(struct config *config)
+{
+       uint8_t next_bootdev, default_bootdev;
+       bool next_valid, default_valid;
+       int rc;
+
+       rc = read_bootdev_sysparam("next-boot-device", &next_bootdev);
+       next_valid = rc == 0;
+
+       rc = read_bootdev_sysparam("default-boot-device", &default_bootdev);
+       default_valid = rc == 0;
+
+       /* nothing valid? no need to change the config */
+       if (!next_valid && !default_valid)
+               return;
+
+       if (!next_valid)
+               next_bootdev = default_bootdev;
+
+       /* todo: copy default to next */
+
+       switch (next_bootdev) {
+       case IPMI_BOOTDEV_NONE:
+               return;
+       case IPMI_BOOTDEV_DISK:
+               set_exclusive_devtype(config, DEVICE_TYPE_DISK);
+               break;
+       case IPMI_BOOTDEV_NETWORK:
+               set_exclusive_devtype(config, DEVICE_TYPE_NETWORK);
+               break;
+       case IPMI_BOOTDEV_CDROM:
+               set_exclusive_devtype(config, DEVICE_TYPE_OPTICAL);
+               break;
+       case IPMI_BOOTDEV_SETUP:
+               config->autoboot_enabled = false;
+               break;
+       }
+}
+
 static int load_config(struct platform *p, struct config *config)
 {
        struct platform_powerpc *platform = to_platform_powerpc(p);
@@ -515,6 +615,8 @@ static int load_config(struct platform *p, struct config *config)
 
        populate_config(platform, config);
 
+       parse_opal_sysparams(config);
+
        return 0;
 }
 
@@ -560,6 +662,7 @@ static bool probe(struct platform *p, void *ctx)
 
 static struct platform platform_powerpc = {
        .name           = "powerpc",
+       .dhcp_arch_id   = 0x000e,
        .probe          = probe,
        .load_config    = load_config,
        .save_config    = save_config,