Add support for memory alignment requirements and adjust a candidate
address to it before checking whether the block is large enough. This
must be done in this order since the alignment adjustment can make a
block smaller than what was requested.
None of the current callers has memory alignment requirements but the
ieee1275 loader for kernel and initrd will use it to convey them.
Signed-off-by: stefan Berger <stef...@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com>
Cc: Hari Bathini <hbath...@linux.ibm.com>
Cc: Pavithra Prakash <pavra...@in.ibm.com>
Cc: Michael Ellerman <m...@ellerman.id.au>
Cc: Carolyn Scherrer <cpsch...@us.ibm.com>
Cc: Mahesh Salgaonkar <mah...@linux.ibm.com>
Cc: Sourabh Jain <sourabhj...@linux.ibm.com>
---
grub-core/kern/ieee1275/init.c | 14 ++++++++++++++
include/grub/powerpc/ieee1275/alloc.h | 1 +
2 files changed, 15 insertions(+)
diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index 6d5fb573a..d71d4b682 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -502,6 +502,20 @@ regions_claim (grub_uint64_t addr, grub_uint64_t len,
grub_memory_type_t type,
}
}
}
+
+ /* Honor alignment restrictions on candidate addr */
+ if (rcr->align)
+ {
+ grub_uint64_t align_addr = ALIGN_UP (addr, rcr->align);
+ grub_uint64_t d = align_addr - addr;
+
+ if (d > len)
+ return 0;
+
+ len -= d;
+ addr = align_addr;
+ }
+
if (rcr->flags & GRUB_MM_ADD_REGION_CONSECUTIVE && len < rcr->total)
return 0;
diff --git a/include/grub/powerpc/ieee1275/alloc.h
b/include/grub/powerpc/ieee1275/alloc.h
index 346d26429..f04738c2c 100644
--- a/include/grub/powerpc/ieee1275/alloc.h
+++ b/include/grub/powerpc/ieee1275/alloc.h
@@ -30,6 +30,7 @@ struct regions_claim_request {
grub_uint32_t total; /* number of requested bytes */
bool init_region; /* whether to add memory to the heap using
grub_mm_init_region() */
grub_uint64_t addr; /* result address */
+ grub_size_t align; /* alignment restrictions */
};
#endif /* GRUB_POWERPC_IEEE1275_ALLOC_HEADER */
--
2.25.1
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