memblock: add memblock_start_of_DRAM()
SPARC32 require access to the start address. Add a new helper
memblock_start_of_DRAM() to give access to the address of the first
memblock - which contains the lowest address.
The awkward name was chosen to match the already present
memblock_end_of_DRAM().
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Yinghai Lu <yinghai@kernel.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 7525e38..e6b843e 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -80,6 +80,7 @@
phys_addr_t align,
phys_addr_t max_addr);
extern phys_addr_t memblock_phys_mem_size(void);
+extern phys_addr_t memblock_start_of_DRAM(void);
extern phys_addr_t memblock_end_of_DRAM(void);
extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
extern int memblock_is_memory(phys_addr_t addr);
diff --git a/mm/memblock.c b/mm/memblock.c
index ccbf973..b7ed636 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -626,6 +626,12 @@
return memblock.memory_size;
}
+/* lowest address */
+phys_addr_t __init_memblock memblock_start_of_DRAM(void)
+{
+ return memblock.memory.regions[0].base;
+}
+
phys_addr_t __init_memblock memblock_end_of_DRAM(void)
{
int idx = memblock.memory.cnt - 1;