arch/arm/mm/physaddr.c

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