LXR linux/arch/mips/mm/physaddr.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/bug.h>
   3#include <linux/export.h>
   4#include <linux/types.h>
   5#include <linux/mmdebug.h>
   6#include <linux/mm.h>
   7
   8#include <asm/sections.h>
   9#include <asm/io.h>
  10#include <asm/page.h>
  11#include <asm/dma.h>
  12
  13static inline bool __debug_virt_addr_valid(unsigned long x)
  14{
  15        /* high_memory does not get immediately defined, and there
  16         * are early callers of __pa() against PAGE_OFFSET
  17         */
  18        if (!high_memory && x >= PAGE_OFFSET)
  19                return true;
  20
  21        if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory)
  22                return true;
  23
  24        /*
  25         * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
  26         * actual physical address. Enough code relies on
  27         * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it
  28         * and always return true.
  29         */
  30        if (x == MAX_DMA_ADDRESS)
  31                return true;
  32
  33        return false;
  34}
  35
  36phys_addr_t __virt_to_phys(volatile const void *x)
  37{
  38        WARN(!__debug_virt_addr_valid((unsigned long)x),
  39             "virt_to_phys used for non-linear address: %pK (%pS)\n",
  40             x, x);
  41
  42        return __virt_to_phys_nodebug(x);
  43}
  44EXPORT_SYMBOL(__virt_to_phys);
  45
  46phys_addr_t __phys_addr_symbol(unsigned long x)
  47{
  48        /* This is bounds checking against the kernel image only.
  49         * __pa_symbol should only be used on kernel symbol addresses.
  50         */
  51        VIRTUAL_BUG_ON(x < (unsigned long)_text ||
  52                       x > (unsigned long)_end);
  53
  54        return __pa_symbol_nodebug(x);
  55}
  56EXPORT_SYMBOL(__phys_addr_symbol);
  57