physaddr.c

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#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 */