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Commit b2dff6a8 authored by bibo,mao's avatar bibo,mao Committed by Andi Kleen
Browse files

[PATCH] i386: Move find_max_pfn function to e820.c 



Move more code from setup.c into e820.c

Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 8e3342f7

arch/i386/kernel/e820.c

+52 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/module.h>

#include <linux/mm.h>

#include <linux/efi.h>

#include <linux/pfn.h>



#include <asm/pgtable.h>

#include <asm/page.h>
@@ -539,3 +540,54 @@ int __init copy_e820_map(struct e820entry * biosmap, int nr_map) 
	return 0;

}



/*

 * Callback for efi_memory_walk.

 */

static int __init

efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)

{

	unsigned long *max_pfn = arg, pfn;



	if (start < end) {

		pfn = PFN_UP(end -1);

		if (pfn > *max_pfn)

			*max_pfn = pfn;

	}

	return 0;

}



static int __init

efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)

{

	memory_present(0, PFN_UP(start), PFN_DOWN(end));

	return 0;

}



/*

 * Find the highest page frame number we have available

 */

void __init find_max_pfn(void)

{

	int i;



	max_pfn = 0;

	if (efi_enabled) {

		efi_memmap_walk(efi_find_max_pfn, &max_pfn);

		efi_memmap_walk(efi_memory_present_wrapper, NULL);

		return;

	}



	for (i = 0; i < e820.nr_map; i++) {

		unsigned long start, end;

		/* RAM? */

		if (e820.map[i].type != E820_RAM)

			continue;

		start = PFN_UP(e820.map[i].addr);

		end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);

		if (start >= end)

			continue;

		if (end > max_pfn)

			max_pfn = end;

		memory_present(0, start, end);

	}

}

arch/i386/kernel/setup.c

+0 −55
Original line number Diff line number Diff line
@@ -63,9 +63,6 @@ 
#include <setup_arch.h>

#include <bios_ebda.h>



/* Forward Declaration. */

void __init find_max_pfn(void);



/* This value is set up by the early boot code to point to the value

   immediately after the boot time page tables.  It contains a *physical*

   address, and must not be in the .bss segment! */
@@ -387,29 +384,6 @@ static int __init parse_reservetop(char *arg) 
}

early_param("reservetop", parse_reservetop);



/*

 * Callback for efi_memory_walk.

 */

static int __init

efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)

{

	unsigned long *max_pfn = arg, pfn;



	if (start < end) {

		pfn = PFN_UP(end -1);

		if (pfn > *max_pfn)

			*max_pfn = pfn;

	}

	return 0;

}



static int __init

efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)

{

	memory_present(0, PFN_UP(start), PFN_DOWN(end));

	return 0;

}



 /*

  * This function checks if the entire range <start,end> is mapped with type.

  *
@@ -442,35 +416,6 @@ e820_all_mapped(unsigned long s, unsigned long e, unsigned type) 
	return 0;

}



/*

 * Find the highest page frame number we have available

 */

void __init find_max_pfn(void)

{

	int i;



	max_pfn = 0;

	if (efi_enabled) {

		efi_memmap_walk(efi_find_max_pfn, &max_pfn);

		efi_memmap_walk(efi_memory_present_wrapper, NULL);

		return;

	}



	for (i = 0; i < e820.nr_map; i++) {

		unsigned long start, end;

		/* RAM? */

		if (e820.map[i].type != E820_RAM)

			continue;

		start = PFN_UP(e820.map[i].addr);

		end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);

		if (start >= end)

			continue;

		if (end > max_pfn)

			max_pfn = end;

		memory_present(0, start, end);

	}

}



/*

 * Determine low and high memory ranges:

 */

include/asm-i386/e820.h

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ extern struct e820map e820; 


extern int e820_all_mapped(unsigned long start, unsigned long end,

			   unsigned type);

extern void find_max_pfn(void);



#endif/*!__ASSEMBLY__*/