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Commit 0a93ebef authored by Sam Ravnborg's avatar Sam Ravnborg Committed by Linus Torvalds
Browse files

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: default avatarSam Ravnborg <sam@ravnborg.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Yinghai Lu <yinghai@kernel.org>
Acked-by: default avatarTejun Heo <tj@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f5252e00

include/linux/memblock.h

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ extern phys_addr_t __memblock_alloc_base(phys_addr_t size, 
					   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);

mm/memblock.c

+6 −0
Original line number Diff line number Diff line
@@ -626,6 +626,12 @@ phys_addr_t __init memblock_phys_mem_size(void) 
	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;