[PATCH 6/7] sparc64: #blocks disk node method

[Eric Snowberg]

Return the number of blocks of storage associated with the device or
instance. Where a "block" is a unit of storage consisting of the number
of bytes returned by the package's "block-size" method. If the size cannot
be determined, the #blocks method returns the maximum unsigned integer
(which, because of Open Firmware's assumption of two's complement arithmetic,
is equivalent to the signed number -1). If the number of blocks exceeds
the range of an unsigned number, return 0 to alert the caller to try
the #blocks64 command.

Signed-off-by: Eric Snowberg <address@hidden>
---
 grub-core/kern/sparc64/ieee1275/ieee1275.c |   29 ++++++++++++++++++++++++++++
 include/grub/sparc64/ieee1275/ieee1275.h   |    1 +
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/grub-core/kern/sparc64/ieee1275/ieee1275.c 
b/grub-core/kern/sparc64/ieee1275/ieee1275.c
index 53be692..ed68d61 100644
--- a/grub-core/kern/sparc64/ieee1275/ieee1275.c
+++ b/grub-core/kern/sparc64/ieee1275/ieee1275.c
@@ -89,3 +89,32 @@ grub_ieee1275_alloc_physmem (grub_addr_t *paddr, grub_size_t 
size,
 
   return args.catch_result;
 }
+
+grub_uint64_t
+grub_ieee1275_num_blocks (grub_ieee1275_ihandle_t ihandle)
+{
+  struct nblocks_args_ieee1275
+  {
+    struct grub_ieee1275_common_hdr common;
+    grub_ieee1275_cell_t method;
+    grub_ieee1275_cell_t ihandle;
+    grub_ieee1275_cell_t catch_result;
+    grub_ieee1275_cell_t blocks;
+  }
+  args;
+
+  INIT_IEEE1275_COMMON (&args.common, "call-method", 2, 2);
+  args.method = (grub_ieee1275_cell_t) "#blocks";
+  args.ihandle = ihandle;
+  args.catch_result = 1;
+
+  if ((IEEE1275_CALL_ENTRY_FN (&args) == -1) || (args.catch_result != 0))
+    return -1;
+
+  /* If the number of blocks exceeds the range of an unsigned number,
+     return 0 to alert the caller to try the #blocks64 command. */
+  if (args.blocks >= 0xffffffffULL)
+    return 0;
+
+  return args.blocks;
+}
diff --git a/include/grub/sparc64/ieee1275/ieee1275.h 
b/include/grub/sparc64/ieee1275/ieee1275.h
index 32c77f8..2ddf44d 100644
--- a/include/grub/sparc64/ieee1275/ieee1275.h
+++ b/include/grub/sparc64/ieee1275/ieee1275.h
@@ -42,6 +42,7 @@ extern int EXPORT_FUNC(grub_ieee1275_claim_vaddr) 
(grub_addr_t vaddr,
 extern int EXPORT_FUNC(grub_ieee1275_alloc_physmem) (grub_addr_t *paddr,
                                                     grub_size_t size,
                                                     grub_uint32_t align);
+extern grub_uint64_t EXPORT_FUNC(grub_ieee1275_num_blocks) (grub_uint32_t 
ihandle);
 
 extern grub_addr_t EXPORT_VAR (grub_ieee1275_original_stack);
 
-- 
1.7.1