linux/arch/x86/mm/physaddr.c
Jeremy Fitzhardinge 78c86e5e56 x86: split __phys_addr out into separate file
Split __phys_addr out into its own file so we can disable
-fstack-protector in a fine-grained fashion.  Also it doesn't
have terribly much to do with the rest of ioremap.c.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2009-09-10 11:48:55 -07:00

71 lines
1.4 KiB
C

#include <linux/mmdebug.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/page.h>
#include "physaddr.h"
#ifdef CONFIG_X86_64
unsigned long __phys_addr(unsigned long x)
{
if (x >= __START_KERNEL_map) {
x -= __START_KERNEL_map;
VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE);
x += phys_base;
} else {
VIRTUAL_BUG_ON(x < PAGE_OFFSET);
x -= PAGE_OFFSET;
VIRTUAL_BUG_ON(!phys_addr_valid(x));
}
return x;
}
EXPORT_SYMBOL(__phys_addr);
bool __virt_addr_valid(unsigned long x)
{
if (x >= __START_KERNEL_map) {
x -= __START_KERNEL_map;
if (x >= KERNEL_IMAGE_SIZE)
return false;
x += phys_base;
} else {
if (x < PAGE_OFFSET)
return false;
x -= PAGE_OFFSET;
if (!phys_addr_valid(x))
return false;
}
return pfn_valid(x >> PAGE_SHIFT);
}
EXPORT_SYMBOL(__virt_addr_valid);
#else
#ifdef CONFIG_DEBUG_VIRTUAL
unsigned long __phys_addr(unsigned long x)
{
/* VMALLOC_* aren't constants */
VIRTUAL_BUG_ON(x < PAGE_OFFSET);
VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x));
return x - PAGE_OFFSET;
}
EXPORT_SYMBOL(__phys_addr);
#endif
bool __virt_addr_valid(unsigned long x)
{
if (x < PAGE_OFFSET)
return false;
if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
return false;
if (x >= FIXADDR_START)
return false;
return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
}
EXPORT_SYMBOL(__virt_addr_valid);
#endif /* CONFIG_X86_64 */