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x86: move page_is_ram() function

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:34:06 +01:00 committed by Ingo Molnar
parent e1271f686a
commit 5f5192b9fe
4 changed files with 27 additions and 23 deletions
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22
arch/x86/mm/init_32.c
View file

@ -211,28 +211,6 @@ static inline int page_kills_ppro(unsigned long pagenr)
return 0;
}
int page_is_ram(unsigned long pagenr)
{
int i;
unsigned long addr, end;
for (i = 0; i < e820.nr_map; i++) {
if (e820.map[i].type != E820_RAM) /* not usable memory */
continue;
/*
* !!!FIXME!!! Some BIOSen report areas as RAM that
* are not. Notably the 640->1Mb area. We need a sanity
* check here.
*/
addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
if ((pagenr >= addr) && (pagenr < end))
return 1;
}
return 0;
}
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;

24
arch/x86/mm/ioremap.c
View file

@ -31,6 +31,30 @@ EXPORT_SYMBOL(__phys_addr);
#endif
int page_is_ram(unsigned long pagenr)
{
unsigned long addr, end;
int i;
for (i = 0; i < e820.nr_map; i++) {
/*
* Not usable memory:
*/
if (e820.map[i].type != E820_RAM)
continue;
/*
* !!!FIXME!!! Some BIOSen report areas as RAM that
* are not. Notably the 640->1Mb area. We need a sanity
* check here.
*/
addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT;
end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT;
if ((pagenr >= addr) && (pagenr < end))
return 1;
}
return 0;
}
/*
* Fix up the linear direct mapping of the kernel to avoid cache attribute
* conflicts.

3
include/asm-x86/page.h
View file

@ -47,6 +47,9 @@
#ifndef __ASSEMBLY__
extern int page_is_ram(unsigned long pagenr);
struct page;
static void inline clear_user_page(void *page, unsigned long vaddr,

1
include/asm-x86/page_32.h
View file

@ -73,7 +73,6 @@ extern int nx_enabled;
*/
extern unsigned int __VMALLOC_RESERVE;
extern int sysctl_legacy_va_layout;
extern int page_is_ram(unsigned long pagenr);
#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
#define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)