MdePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdePkg / Library / BaseCacheMaintenanceLib / X86Cache.c

/** @file\r
  Cache Maintenance Functions.\r
\r
  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
\r
**/\r
\r
#include <Base.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
\r
/**\r
  Invalidates the entire instruction cache in cache coherency domain of the\r
  calling CPU.\r
\r
**/\r
VOID\r
EFIAPI\r
InvalidateInstructionCache (\r
  VOID\r
  )\r
{\r
}\r
\r
/**\r
  Invalidates a range of instruction cache lines in the cache coherency domain\r
  of the calling CPU.\r
\r
  Invalidates the instruction cache lines specified by Address and Length. If\r
  Address is not aligned on a cache line boundary, then entire instruction\r
  cache line containing Address is invalidated. If Address + Length is not\r
  aligned on a cache line boundary, then the entire instruction cache line\r
  containing Address + Length -1 is invalidated. This function may choose to\r
  invalidate the entire instruction cache if that is more efficient than\r
  invalidating the specified range. If Length is 0, then no instruction cache\r
  lines are invalidated. Address is returned.\r
\r
  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().\r
\r
  @param  Address The base address of the instruction cache lines to\r
                  invalidate. If the CPU is in a physical addressing mode, then\r
                  Address is a physical address. If the CPU is in a virtual\r
                  addressing mode, then Address is a virtual address.\r
\r
  @param  Length  The number of bytes to invalidate from the instruction cache.\r
\r
  @return Address.\r
\r
**/\r
VOID *\r
EFIAPI\r
InvalidateInstructionCacheRange (\r
  IN      VOID                      *Address,\r
  IN      UINTN                     Length\r
  )\r
{\r
  if (Length == 0) {\r
    return Address;\r
  }\r
\r
  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Address));\r
  return Address;\r
}\r
\r
/**\r
  Writes back and invalidates the entire data cache in cache coherency domain\r
  of the calling CPU.\r
\r
  Writes back and invalidates the entire data cache in cache coherency domain\r
  of the calling CPU. This function guarantees that all dirty cache lines are\r
  written back to system memory, and also invalidates all the data cache lines\r
  in the cache coherency domain of the calling CPU.\r
\r
**/\r
VOID\r
EFIAPI\r
WriteBackInvalidateDataCache (\r
  VOID\r
  )\r
{\r
  AsmWbinvd ();\r
}\r
\r
/**\r
  Writes back and invalidates a range of data cache lines in the cache\r
  coherency domain of the calling CPU.\r
\r
  Writes back and invalidates the data cache lines specified by Address and\r
  Length. If Address is not aligned on a cache line boundary, then entire data\r
  cache line containing Address is written back and invalidated. If Address +\r
  Length is not aligned on a cache line boundary, then the entire data cache\r
  line containing Address + Length -1 is written back and invalidated. This\r
  function may choose to write back and invalidate the entire data cache if\r
  that is more efficient than writing back and invalidating the specified\r
  range. If Length is 0, then no data cache lines are written back and\r
  invalidated. Address is returned.\r
\r
  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().\r
\r
  @param  Address The base address of the data cache lines to write back and\r
                  invalidate. If the CPU is in a physical addressing mode, then\r
                  Address is a physical address. If the CPU is in a virtual\r
                  addressing mode, then Address is a virtual address.\r
  @param  Length  The number of bytes to write back and invalidate from the\r
                  data cache.\r
\r
  @return Address of cache invalidation.\r
\r
**/\r
VOID *\r
EFIAPI\r
WriteBackInvalidateDataCacheRange (\r
  IN      VOID                      *Address,\r
  IN      UINTN                     Length\r
  )\r
{\r
  UINT32                            RegEbx;\r
  UINT32                            RegEdx;\r
  UINTN                             CacheLineSize;\r
  UINTN                             Start;\r
  UINTN                             End;\r
\r
  if (Length == 0) {\r
    return Address;\r
  }\r
\r
  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Address));\r
\r
  //\r
  // If the CPU does not support CLFLUSH instruction,\r
  // then promote flush range to flush entire cache.\r
  //\r
  AsmCpuid (0x01, NULL, &RegEbx, NULL, &RegEdx);\r
  if ((RegEdx & BIT19) == 0) {\r
    AsmWbinvd ();\r
    return Address;\r
  }\r
\r
  //\r
  // Cache line size is 8 * Bits 15-08 of EBX returned from CPUID 01H\r
  //\r
  CacheLineSize = (RegEbx & 0xff00) >> 5;\r
\r
  Start = (UINTN)Address;\r
  //\r
  // Calculate the cache line alignment\r
  //\r
  End = (Start + Length + (CacheLineSize - 1)) & ~(CacheLineSize - 1);\r
  Start &= ~((UINTN)CacheLineSize - 1);\r
\r
  do {\r
    Start = (UINTN)AsmFlushCacheLine ((VOID*)Start) + CacheLineSize;\r
  } while (Start != End);\r
  return Address;\r
}\r
\r
/**\r
  Writes back the entire data cache in cache coherency domain of the calling\r
  CPU.\r
\r
  Writes back the entire data cache in cache coherency domain of the calling\r
  CPU. This function guarantees that all dirty cache lines are written back to\r
  system memory. This function may also invalidate all the data cache lines in\r
  the cache coherency domain of the calling CPU.\r
\r
**/\r
VOID\r
EFIAPI\r
WriteBackDataCache (\r
  VOID\r
  )\r
{\r
  WriteBackInvalidateDataCache ();\r
}\r
\r
/**\r
  Writes back a range of data cache lines in the cache coherency domain of the\r
  calling CPU.\r
\r
  Writes back the data cache lines specified by Address and Length. If Address\r
  is not aligned on a cache line boundary, then entire data cache line\r
  containing Address is written back. If Address + Length is not aligned on a\r
  cache line boundary, then the entire data cache line containing Address +\r
  Length -1 is written back. This function may choose to write back the entire\r
  data cache if that is more efficient than writing back the specified range.\r
  If Length is 0, then no data cache lines are written back. This function may\r
  also invalidate all the data cache lines in the specified range of the cache\r
  coherency domain of the calling CPU. Address is returned.\r
\r
  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().\r
\r
  @param  Address The base address of the data cache lines to write back. If\r
                  the CPU is in a physical addressing mode, then Address is a\r
                  physical address. If the CPU is in a virtual addressing\r
                  mode, then Address is a virtual address.\r
  @param  Length  The number of bytes to write back from the data cache.\r
\r
  @return Address of cache written in main memory.\r
\r
**/\r
VOID *\r
EFIAPI\r
WriteBackDataCacheRange (\r
  IN      VOID                      *Address,\r
  IN      UINTN                     Length\r
  )\r
{\r
  return WriteBackInvalidateDataCacheRange (Address, Length);\r
}\r
\r
/**\r
  Invalidates the entire data cache in cache coherency domain of the calling\r
  CPU.\r
\r
  Invalidates the entire data cache in cache coherency domain of the calling\r
  CPU. This function must be used with care because dirty cache lines are not\r
  written back to system memory. It is typically used for cache diagnostics. If\r
  the CPU does not support invalidation of the entire data cache, then a write\r
  back and invalidate operation should be performed on the entire data cache.\r
\r
**/\r
VOID\r
EFIAPI\r
InvalidateDataCache (\r
  VOID\r
  )\r
{\r
  AsmInvd ();\r
}\r
\r
/**\r
  Invalidates a range of data cache lines in the cache coherency domain of the\r
  calling CPU.\r
\r
  Invalidates the data cache lines specified by Address and Length. If Address\r
  is not aligned on a cache line boundary, then entire data cache line\r
  containing Address is invalidated. If Address + Length is not aligned on a\r
  cache line boundary, then the entire data cache line containing Address +\r
  Length -1 is invalidated. This function must never invalidate any cache lines\r
  outside the specified range. If Length is 0, then no data cache lines are\r
  invalidated. Address is returned. This function must be used with care\r
  because dirty cache lines are not written back to system memory. It is\r
  typically used for cache diagnostics. If the CPU does not support\r
  invalidation of a data cache range, then a write back and invalidate\r
  operation should be performed on the data cache range.\r
\r
  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().\r
\r
  @param  Address The base address of the data cache lines to invalidate. If\r
                  the CPU is in a physical addressing mode, then Address is a\r
                  physical address. If the CPU is in a virtual addressing mode,\r
                  then Address is a virtual address.\r
  @param  Length  The number of bytes to invalidate from the data cache.\r
\r
  @return Address.\r
\r
**/\r
VOID *\r
EFIAPI\r
InvalidateDataCacheRange (\r
  IN      VOID                      *Address,\r
  IN      UINTN                     Length\r
  )\r
{\r
  //\r
  // Invalidation of a data cache range without writing back is not supported on\r
  // x86 architecture, so write back and invalidate operation is performed.\r
  //\r
  return WriteBackInvalidateDataCacheRange (Address, Length);\r
}\r