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Re: [PATCH 02/15] sparc64: Add blocklist GPT support for SPARC

From: Vladimir 'phcoder' Serbinenko
Subject: Re: [PATCH 02/15] sparc64: Add blocklist GPT support for SPARC
Date: Wed, 10 May 2017 22:42:16 +0000

On Wed, Jun 29, 2016, 23:47 Eric Snowberg <address@hidden> wrote:
Add block-list GPT support for SPARC.  The OBP "load" and "boot" methods
are partition aware and neither command can see the partition table. Also
neither command can address the entire physical disk. When the install happens,
grub generates the block-list entries based on the beginning of the physical
disk, not the beginning of the parition. This patch fixes the block-list
entries so they match what OBP expects during boot for a GPT disk.

T5 and above now supports GPT as well as VTOC.

This patch has been tested on T5-2 and newer SPARC systems.

Signed-off-by: Eric Snowberg <address@hidden>
 grub-core/osdep/linux/blocklist.c |    5 +++++
 util/setup.c                      |   12 +++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/grub-core/osdep/linux/blocklist.c b/grub-core/osdep/linux/blocklist.c
index c77d608..caf8d4e 100644
--- a/grub-core/osdep/linux/blocklist.c
+++ b/grub-core/osdep/linux/blocklist.c
@@ -58,6 +58,11 @@ grub_install_get_blocklist (grub_device_t root_dev,
   struct fiemap fie1;
   int fd;

+#ifdef __sparc__
+  if (grub_strstr (container->partmap->name, "gpt"))
+    container_start = 0;
This makes ifdef conditional on platform of the tool, not of the binaries and they can be different. Also there are several implementations of blocklist retrieving for different platform. This condition needs to be detected and adjusted for in the caller (setup)
   /* Write the first two sectors of the core image onto the disk.  */
   grub_util_info ("opening the core image `%s'", core_path);
   fd = open (core_path, O_RDONLY);
diff --git a/util/setup.c b/util/setup.c
index 8aa5a39..5908498 100644
--- a/util/setup.c
+++ b/util/setup.c
@@ -721,15 +721,21 @@ unable_to_embed:
     char *buf, *ptr = core_img;
     size_t len = core_size;
-    grub_uint64_t blk;
+    grub_uint64_t blk, offset = 0;
     grub_partition_t container = core_dev->disk->partition;
     grub_err_t err;

     core_dev->disk->partition = 0;
+    {
+      if (grub_strstr (container->partmap->name, "gpt"))
+        offset = grub_partition_get_start (container);
+    }

     buf = xmalloc (core_size);
     blk = bl.first_sector;
-    err = grub_disk_read (core_dev->disk, blk, 0, GRUB_DISK_SECTOR_SIZE, buf);
+    err = grub_disk_read (core_dev->disk, blk + offset, 0, GRUB_DISK_SECTOR_SIZE, buf);
     if (err)
       grub_util_error (_("cannot read `%s': %s"), core_dev->disk->name,
@@ -748,7 +754,7 @@ unable_to_embed:
        if (cur > len)
          cur = len;

-       err = grub_disk_read (core_dev->disk, blk, 0, cur, buf);
+       err = grub_disk_read (core_dev->disk, blk + offset, 0, cur, buf);
        if (err)
          grub_util_error (_("cannot read `%s': %s"), core_dev->disk->name,

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