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Commit db84dc61 authored by Franck Bui-Huu's avatar Franck Bui-Huu Committed by Ralf Baechle
Browse files

[MIPS] Setup min_low_pfn/max_low_pfn correctly 



This patch makes a better usage of these two globals.
'min_low_pfn' is now correctly setup for all configs, which
allow us to rely on it in boot memory code init.

Signed-off-by: default avatarFranck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent a583158c

arch/mips/kernel/setup.c

+27 −9
Original line number Diff line number Diff line
@@ -271,8 +271,7 @@ static void __init bootmem_init(void) 
static void __init bootmem_init(void)

{

	unsigned long reserved_end;

	unsigned long highest = 0;

	unsigned long mapstart = -1UL;

	unsigned long mapstart = ~0UL;

	unsigned long bootmap_size;

	int i;
@@ -283,6 +282,13 @@ static void __init bootmem_init(void) 
	 */

	reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));



	/*

	 * max_low_pfn is not a number of pages. The number of pages

	 * of the system is given by 'max_low_pfn - min_low_pfn'.

	 */

	min_low_pfn = ~0UL;

	max_low_pfn = 0;



	/*

	 * Find the highest page frame number we have available.

	 */
@@ -296,8 +302,10 @@ static void __init bootmem_init(void) 
		end = PFN_DOWN(boot_mem_map.map[i].addr

				+ boot_mem_map.map[i].size);



		if (end > highest)

			highest = end;

		if (end > max_low_pfn)

			max_low_pfn = end;

		if (start < min_low_pfn)

			min_low_pfn = start;

		if (end <= reserved_end)

			continue;

		if (start >= mapstart)
@@ -305,22 +313,32 @@ static void __init bootmem_init(void) 
		mapstart = max(reserved_end, start);

	}



	if (min_low_pfn >= max_low_pfn)

		panic("Incorrect memory mapping !!!");

	if (min_low_pfn > 0) {

		printk(KERN_INFO

		       "Wasting %lu bytes for tracking %lu unused pages\n",

		       min_low_pfn * sizeof(struct page),

		       min_low_pfn);

		min_low_pfn = 0;

	}



	/*

	 * Determine low and high memory ranges

	 */

	if (highest > PFN_DOWN(HIGHMEM_START)) {

	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {

#ifdef CONFIG_HIGHMEM

		highstart_pfn = PFN_DOWN(HIGHMEM_START);

		highend_pfn = highest;

		highend_pfn = max_low_pfn;

#endif

		highest = PFN_DOWN(HIGHMEM_START);

		max_low_pfn = PFN_DOWN(HIGHMEM_START);

	}



	/*

	 * Initialize the boot-time allocator with low memory only.

	 */

	bootmap_size = init_bootmem(mapstart, highest);



	bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,

					 min_low_pfn, max_low_pfn);

	/*

	 * Register fully available low RAM pages with the bootmem allocator.

	 */

arch/mips/mm/init.c

+11 −12
Original line number Diff line number Diff line
@@ -341,7 +341,6 @@ static int __init page_is_ram(unsigned long pagenr) 
void __init paging_init(void)

{

	unsigned long zones_size[MAX_NR_ZONES] = { 0, };

	unsigned long max_dma, low;

#ifndef CONFIG_FLATMEM

	unsigned long zholes_size[MAX_NR_ZONES] = { 0, };

	unsigned long i, j, pfn;
@@ -354,19 +353,19 @@ void __init paging_init(void) 
#endif

	kmap_coherent_init();



	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;

	low = max_low_pfn;



#ifdef CONFIG_ISA

	if (low < max_dma)

		zones_size[ZONE_DMA] = low;

	else {

		zones_size[ZONE_DMA] = max_dma;

		zones_size[ZONE_NORMAL] = low - max_dma;

	if (max_low_pfn >= MAX_DMA_PFN)

		if (min_low_pfn >= MAX_DMA_PFN) {

			zones_size[ZONE_DMA] = 0;

			zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;

		} else {

			zones_size[ZONE_DMA] = MAX_DMA_PFN - min_low_pfn;

			zones_size[ZONE_NORMAL] = max_low_pfn - MAX_DMA_PFN;

		}

#else

	zones_size[ZONE_DMA] = low;

	else

#endif

	zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;



#ifdef CONFIG_HIGHMEM

	zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn;

include/asm-mips/dma.h

+1 −0
Original line number Diff line number Diff line
@@ -91,6 +91,7 @@ 
#else

#define MAX_DMA_ADDRESS		(PAGE_OFFSET + 0x01000000)

#endif

#define MAX_DMA_PFN		PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))



/* 8237 DMA controllers */

#define IO_DMA1_BASE	0x00	/* 8 bit slave DMA, channels 0..3 */