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

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Yi Li 2008-03-26 07:08:12 +08:00 committed by Bryan Wu
parent 9df7a8f622
commit 2e8d7965e6
1 changed files with 45 additions and 7 deletions
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52
arch/blackfin/kernel/setup.c
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@ -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) static __init void setup_bootmem_allocator(void)
{ {
int bootmap_size; int bootmap_size;
int i; int i;
unsigned long min_pfn, max_pfn; unsigned long start_pfn, end_pfn;
unsigned long curr_pfn, last_pfn, size; unsigned long curr_pfn, last_pfn, size;
/* mark memory between memory_start and memory_end usable */ /* 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); sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
print_memory_map("boot memmap"); print_memory_map("boot memmap");
min_pfn = PAGE_OFFSET >> PAGE_SHIFT; /* intialize globals in linux/bootmem.h */
max_pfn = memory_end >> PAGE_SHIFT; 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 * 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), bootmap_size = init_bootmem_node(NODE_DATA(0),
memory_start >> PAGE_SHIFT, /* map goes here */ memory_start >> PAGE_SHIFT, /* map goes here */
min_pfn, max_pfn); start_pfn, end_pfn);
/* register the memmap regions with the bootmem allocator */ /* register the memmap regions with the bootmem allocator */
for (i = 0; i < bfin_memmap.nr_map; i++) { 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: * We are rounding up the start address of usable memory:
*/ */
curr_pfn = PFN_UP(bfin_memmap.map[i].addr); curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
if (curr_pfn >= max_pfn) if (curr_pfn >= end_pfn)
continue; continue;
/* /*
* ... and at the end of the usable range downwards: * ... 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 + last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
bfin_memmap.map[i].size); bfin_memmap.map[i].size);
if (last_pfn > max_pfn) if (last_pfn > end_pfn)
last_pfn = max_pfn; last_pfn = end_pfn;
/* /*
* .. finally, did all the rounding and playing * .. finally, did all the rounding and playing