X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseCacheMaintenanceLib%2Fx86Cache.c;h=3879cdfa2d2b05927f32e71324de2f8bfbd80005;hp=f86d9d62217e15f45c7a27f406b488cc8ff0343e;hb=9f84a60982db062161f0c70827f4d844fa87d472;hpb=98fc92fcbd2e63805ace94c908c6ffabe093db5c

diff --git a/MdePkg/Library/BaseCacheMaintenanceLib/x86Cache.c b/MdePkg/Library/BaseCacheMaintenanceLib/x86Cache.c
index f86d9d6221..3879cdfa2d 100644
--- a/MdePkg/Library/BaseCacheMaintenanceLib/x86Cache.c
+++ b/MdePkg/Library/BaseCacheMaintenanceLib/x86Cache.c
@@ -14,15 +14,47 @@
 
 **/
 
+/**
+  Invalidates the entire instruction cache in cache coherency domain of the
+  calling CPU.
+
+  Invalidates the entire instruction cache in cache coherency domain of the
+  calling CPU.
+
+**/
 VOID
 EFIAPI
 InvalidateInstructionCache (
   VOID
   )
 {
-  return;
 }
 
+/**
+  Invalidates a range of instruction cache lines in the cache coherency domain
+  of the calling CPU.
+
+  Invalidates the instruction cache lines specified by Address and Length. If
+  Address is not aligned on a cache line boundary, then entire instruction
+  cache line containing Address is invalidated. If Address + Length is not
+  aligned on a cache line boundary, then the entire instruction cache line
+  containing Address + Length -1 is invalidated. This function may choose to
+  invalidate the entire instruction cache if that is more efficient than
+  invalidating the specified range. If Length is 0, the no instruction cache
+  lines are invalidated. Address is returned.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the instruction cache lines to
+                  invalidate. If the CPU is in a physical addressing mode, then
+                  Address is a physical address. If the CPU is in a virtual
+                  addressing mode, then Address is a virtual address.
+
+  @param  Length  The number of bytes to invalidate from the instruction cache.
+
+  @return Address
+
+**/
 VOID *
 EFIAPI
 InvalidateInstructionCacheRange (
@@ -30,9 +62,20 @@ InvalidateInstructionCacheRange (
   IN      UINTN                     Length
   )
 {
+  ASSERT (Length <= MAX_ADDRESS - (UINTN)Address + 1);
   return Address;
 }
 
+/**
+  Writes Back and Invalidates the entire data cache in cache coherency domain
+  of the calling CPU.
+
+  Writes Back and Invalidates the entire data cache in cache coherency domain
+  of the calling CPU. This function guarantees that all dirty cache lines are
+  written back to system memory, and also invalidates all the data cache lines
+  in the cache coherency domain of the calling CPU.
+
+**/
 VOID
 EFIAPI
 WriteBackInvalidateDataCache (
@@ -42,6 +85,32 @@ WriteBackInvalidateDataCache (
   AsmWbinvd ();
 }
 
+/**
+  Writes Back and Invalidates a range of data cache lines in the cache
+  coherency domain of the calling CPU.
+
+  Writes Back and Invalidate the data cache lines specified by Address and
+  Length. If Address is not aligned on a cache line boundary, then entire data
+  cache line containing Address is written back and invalidated. If Address +
+  Length is not aligned on a cache line boundary, then the entire data cache
+  line containing Address + Length -1 is written back and invalidated. This
+  function may choose to write back and invalidate the entire data cache if
+  that is more efficient than writing back and invalidating the specified
+  range. If Length is 0, the no data cache lines are written back and
+  invalidated. Address is returned.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the data cache lines to write back and
+                  invalidate. If the CPU is in a physical addressing mode, then
+                  Address is a physical address. If the CPU is in a virtual
+                  addressing mode, then Address is a virtual address.
+  @param  Length  The number of bytes to write back and invalidate from the
+                  data cache.
+
+  @return Address
+
+**/
 VOID *
 EFIAPI
 WriteBackInvalidateDataCacheRange (
@@ -49,21 +118,66 @@ WriteBackInvalidateDataCacheRange (
   IN      UINTN                     Length
   )
 {
-  if (Length != 0) {
-    AsmWbinvd ();
+  UINT8                             (*Uint8Ptr)[32];
+
+  ASSERT (Length <= MAX_ADDRESS - (UINTN)Address + 1);
+
+  Uint8Ptr = Address;
+  while (Length > sizeof (*Uint8Ptr)) {
+    AsmFlushCacheLine (Uint8Ptr++);
+    Length -= sizeof (*Uint8Ptr);
+  }
+  if (Length > 0) {
+    AsmFlushCacheLine (Uint8Ptr);
+    AsmFlushCacheLine (&(*Uint8Ptr)[Length - 1]);
   }
   return Address;
 }
 
+/**
+  Writes Back the entire data cache in cache coherency domain of the calling
+  CPU.
+
+  Writes Back the entire data cache in cache coherency domain of the calling
+  CPU. This function guarantees that all dirty cache lines are written back to
+  system memory. This function may also invalidate all the data cache lines in
+  the cache coherency domain of the calling CPU.
+
+**/
 VOID
 EFIAPI
 WriteBackDataCache (
   VOID
   )
 {
-  AsmWbinvd ();
+  WriteBackInvalidateDataCache ();
 }
 
+/**
+  Writes Back a range of data cache lines in the cache coherency domain of the
+  calling CPU.
+
+  Writes Back the data cache lines specified by Address and Length. If Address
+  is not aligned on a cache line boundary, then entire data cache line
+  containing Address is written back. If Address + Length is not aligned on a
+  cache line boundary, then the entire data cache line containing Address +
+  Length -1 is written back. This function may choose to write back the entire
+  data cache if that is more efficient than writing back the specified range.
+  If Length is 0, the no data cache lines are written back. This function may
+  also invalidate all the data cache lines in the specified range of the cache
+  coherency domain of the calling CPU. Address is returned.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the data cache lines to write back. If
+                  the CPU is in a physical addressing mode, then Address is a
+                  physical address. If the CPU is in a virtual addressing
+                  mode, then Address is a virtual address.
+  @param  Length  The number of bytes to write back from the data cache.
+
+  @return Address
+
+**/
 VOID *
 EFIAPI
 WriteBackDataCacheRange (
@@ -71,10 +185,20 @@ WriteBackDataCacheRange (
   IN      UINTN                     Length
   )
 {
-  AsmWbinvd ();
-  return Address;
+  return WriteBackInvalidateDataCacheRange (Address, Length);
 }
 
+/**
+  Invalidates the entire data cache in cache coherency domain of the calling
+  CPU.
+
+  Invalidates the entire data cache in cache coherency domain of the calling
+  CPU. This function must be used with care because dirty cache lines are not
+  written back to system memory. It is typically used for cache diagnostics. If
+  the CPU does not support invalidation of the entire data cache, then a write
+  back and invalidate operation should be performed on the entire data cache.
+
+**/
 VOID
 EFIAPI
 InvalidateDataCache (
@@ -84,6 +208,33 @@ InvalidateDataCache (
   AsmInvd ();
 }
 
+/**
+  Invalidates a range of data cache lines in the cache coherency domain of the
+  calling CPU.
+
+  Invalidates the data cache lines specified by Address and Length. If Address
+  is not aligned on a cache line boundary, then entire data cache line
+  containing Address is invalidated. If Address + Length is not aligned on a
+  cache line boundary, then the entire data cache line containing Address +
+  Length -1 is invalidated. This function must never invalidate any cache lines
+  outside the specified range. If Length is 0, the no data cache lines are
+  invalidated. Address is returned. This function must be used with care
+  because dirty cache lines are not written back to system memory. It is
+  typically used for cache diagnostics. If the CPU does not support
+  invalidation of a data cache range, then a write back and invalidate
+  operation should be performed on the data cache range.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the data cache lines to invalidate. If
+                  the CPU is in a physical addressing mode, then Address is a
+                  physical address. If the CPU is in a virtual addressing mode,
+                  then Address is a virtual address.
+  @param  Length  The number of bytes to invalidate from the data cache.
+
+  @return Address
+
+**/
 VOID *
 EFIAPI
 InvalidateDataCacheRange (
@@ -91,5 +242,5 @@ InvalidateDataCacheRange (
   IN      UINTN                     Length
   )
 {
-  return Address;
+  return WriteBackInvalidateDataCacheRange (Address, Length);
 }