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Commit 2e8d7965 authored by Yi Li's avatar Yi Li Committed by Bryan Wu
Browse files

[Blackfin] arch: add code to initialize globals declared in linux/bootmem.h:... 


[Blackfin] arch: add code to initialize globals declared in linux/bootmem.h: max_pfn, max_low_pfn, min_low_pfn.

Signed-off-by: default avatarYi Li <yi.li@analog.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent 9df7a8f6

arch/blackfin/kernel/setup.c

+45 −7
Original line number Diff line number Diff line
@@ -547,11 +547,38 @@ static __init void memory_setup(void) 
		);

}



/*

 * Find the lowest, highest page frame number we have available

 */

void __init find_min_max_pfn(void)

{

	int i;



	max_pfn = 0;

	min_low_pfn = memory_end;



	for (i = 0; i < bfin_memmap.nr_map; i++) {

		unsigned long start, end;

		/* RAM? */

		if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)

			continue;

		start = PFN_UP(bfin_memmap.map[i].addr);

		end = PFN_DOWN(bfin_memmap.map[i].addr +

				bfin_memmap.map[i].size);

		if (start >= end)

			continue;

		if (end > max_pfn)

			max_pfn = end;

		if (start < min_low_pfn)

			min_low_pfn = start;

	}

}



static __init void setup_bootmem_allocator(void)

{

	int bootmap_size;

	int i;

	unsigned long min_pfn, max_pfn;

	unsigned long start_pfn, end_pfn;

	unsigned long curr_pfn, last_pfn, size;



	/* mark memory between memory_start and memory_end usable */
@@ -561,8 +588,19 @@ static __init void setup_bootmem_allocator(void) 
	sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);

	print_memory_map("boot memmap");



	min_pfn = PAGE_OFFSET >> PAGE_SHIFT;

	/* intialize globals in linux/bootmem.h */

	find_min_max_pfn();

	/* pfn of the last usable page frame */

	if (max_pfn > memory_end >> PAGE_SHIFT)

		max_pfn = memory_end >> PAGE_SHIFT;

	/* pfn of last page frame directly mapped by kernel */

	max_low_pfn = max_pfn;

	/* pfn of the first usable page frame after kernel image*/

	if (min_low_pfn < memory_start >> PAGE_SHIFT)

		min_low_pfn = memory_start >> PAGE_SHIFT;



	start_pfn = PAGE_OFFSET >> PAGE_SHIFT;

	end_pfn = memory_end >> PAGE_SHIFT;



	/*

	 * give all the memory to the bootmap allocator,  tell it to put the
@@ -570,7 +608,7 @@ static __init void setup_bootmem_allocator(void) 
	 */

	bootmap_size = init_bootmem_node(NODE_DATA(0),

			memory_start >> PAGE_SHIFT,	/* map goes here */

			min_pfn, max_pfn);

			start_pfn, end_pfn);



	/* register the memmap regions with the bootmem allocator */

	for (i = 0; i < bfin_memmap.nr_map; i++) {
@@ -583,7 +621,7 @@ static __init void setup_bootmem_allocator(void) 
		 * We are rounding up the start address of usable memory:

		 */

		curr_pfn = PFN_UP(bfin_memmap.map[i].addr);

		if (curr_pfn >= max_pfn)

		if (curr_pfn >= end_pfn)

			continue;

		/*

		 * ... and at the end of the usable range downwards:
@@ -591,8 +629,8 @@ static __init void setup_bootmem_allocator(void) 
		last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +

					 bfin_memmap.map[i].size);



		if (last_pfn > max_pfn)

			last_pfn = max_pfn;

		if (last_pfn > end_pfn)

			last_pfn = end_pfn;



		/*

		 * .. finally, did all the rounding and playing