arch/riscv/mm/physaddr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/types.h>
   4 #include <linux/mmdebug.h>
   5 #include <linux/mm.h>
   6 #include <asm/page.h>
   7 #include <asm/sections.h>
   8
   9 phys_addr_t __virt_to_phys(unsigned long x)
  10 {
  11         /*
  12          * Boundary checking aginst the kernel linear mapping space.
  13          */
  14         WARN(!is_linear_mapping(x) && !is_kernel_mapping(x),
  15              "virt_to_phys used for non-linear address: %pK (%pS)\n",
  16              (void *)x, (void *)x);
  17
  18         return __va_to_pa_nodebug(x);
  19 }
  20 EXPORT_SYMBOL(__virt_to_phys);
  21
  22 phys_addr_t __phys_addr_symbol(unsigned long x)
  23 {
  24         unsigned long kernel_start = kernel_map.virt_addr;
  25         unsigned long kernel_end = kernel_start + kernel_map.size;
  26
  27         /*
  28          * Boundary checking aginst the kernel image mapping.
  29          * __pa_symbol should only be used on kernel symbol addresses.
  30          */
  31         VIRTUAL_BUG_ON(x < kernel_start || x > kernel_end);
  32
  33         return __va_to_pa_nodebug(x);
  34 }
  35 EXPORT_SYMBOL(__phys_addr_symbol);
  36
  37 phys_addr_t linear_mapping_va_to_pa(unsigned long x)
  38 {
  39         BUG_ON(!kernel_map.va_pa_offset);
  40
  41         return ((unsigned long)(x) - kernel_map.va_pa_offset);
  42 }
  43 EXPORT_SYMBOL(linear_mapping_va_to_pa);
  44
  45 void *linear_mapping_pa_to_va(unsigned long x)
  46 {
  47         BUG_ON(!kernel_map.va_pa_offset);
  48
  49         return ((void *)((unsigned long)(x) + kernel_map.va_pa_offset));
  50 }
  51 EXPORT_SYMBOL(linear_mapping_pa_to_va);