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
  13 static 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
  36 phys_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 }
  44 EXPORT_SYMBOL(__virt_to_phys);
  45
  46 phys_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 }
  56 EXPORT_SYMBOL(__phys_addr_symbol);