kernel/include/arch-x64/addrs.h

   1 #ifndef _ARCH_ADDRS_H
   2 #define _ARCH_ADDRS_H
   3
   4 #define KERNEL_START  0xffffffff80000000
   5 #define PHYSMEM_START 0xffff800000000000
   6
   7 #ifdef __cplusplus
   8 #include <kern/types.h>
   9
  10 // GCC can't currently handle full 64-bit code relocations
  11 // on x64, so the code is mapped separately from the
  12 // all-of-RAM mapping.  This means that there are two different
  13 // kernel-virtual addresses for some physical addresses.
  14
  15 namespace Arch {
  16         static inline ulong kvirt_to_phys(void *addr)
  17         {
  18                 ulong ret = reinterpret_cast<ulong>(addr);
  19
  20                 if (ret > KERNEL_START)
  21                         return ret - KERNEL_START;
  22                 else
  23                         return ret - PHYSMEM_START;
  24         }
  25
  26         static inline void *phys_to_kvirt(ulong addr)
  27         {
  28                 return reinterpret_cast<void *>(addr + PHYSMEM_START);
  29         }
  30
  31         namespace Priv {
  32                 static const ulong max_ktext_map = 4 * 1024 * 1024;
  33
  34                 static inline void *phys_to_ktext(ulong addr)
  35                 {
  36                         return reinterpret_cast<void *>(addr + KERNEL_START);
  37                 }
  38         }
  39 };
  40
  41 #endif
  42 #endif