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/addrspace.h>
   9 #include <asm/sections.h>
  10 #include <asm/io.h>
  11 #include <asm/page.h>
  12 #include <asm/dma.h>
  13
  14 static inline bool __debug_virt_addr_valid(unsigned long x)
  15 {
  16         /*
  17          * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
  18          * actual physical address. Enough code relies on
  19          * virt_to_phys(MAX_DMA_ADDRESS) that we just need to work around it
  20          * and always return true.
  21          */
  22         if (x == MAX_DMA_ADDRESS)
  23                 return true;
  24
  25         return x >= PAGE_OFFSET && (KSEGX(x) < KSEG2 ||
  26                IS_ENABLED(CONFIG_EVA) ||
  27                !IS_ENABLED(CONFIG_HIGHMEM));
  28 }
  29
  30 phys_addr_t __virt_to_phys(volatile const void *x)
  31 {
  32         WARN(!__debug_virt_addr_valid((unsigned long)x),
  33              "virt_to_phys used for non-linear address: %pK (%pS)\n",
  34              x, x);
  35
  36         return __virt_to_phys_nodebug(x);
  37 }
  38 EXPORT_SYMBOL(__virt_to_phys);
  39
  40 phys_addr_t __phys_addr_symbol(unsigned long x)
  41 {
  42         /* This is bounds checking against the kernel image only.
  43          * __pa_symbol should only be used on kernel symbol addresses.
  44          */
  45         VIRTUAL_BUG_ON(x < (unsigned long)_text ||
  46                        x > (unsigned long)_end);
  47
  48         return __pa_symbol_nodebug(x);
  49 }
  50 EXPORT_SYMBOL(__phys_addr_symbol);