diff options
Diffstat (limited to 'MdePkg')
| -rw-r--r-- | MdePkg/Include/Library/BaseLib.h | 28 | ||||
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/DisableCache.c | 6 | ||||
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/EnableCache.c | 6 |
3 files changed, 34 insertions, 6 deletions
diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h index 4ffddfd5f6..3cb2cdb154 100644 --- a/MdePkg/Include/Library/BaseLib.h +++ b/MdePkg/Include/Library/BaseLib.h @@ -5213,6 +5213,34 @@ AsmCpuidEx ( /**
+ Set CD bit and clear NW bit of CR0 followed by a WBINVD.
+
+ Disables the caches by setting the CD bit of CR0 to 1, clearing the NW bit of CR0 to 0,
+ and executing a WBINVD instruction. This function is only available on IA-32 and x64.
+
+**/
+VOID
+EFIAPI
+AsmDisableCache (
+ VOID
+ );
+
+
+/**
+ Perform a WBINVD and clear both the CD and NW bits of CR0.
+
+ Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
+ bits of CR0 to 0. This function is only available on IA-32 and x64.
+
+**/
+VOID
+EFIAPI
+AsmEnableCache (
+ VOID
+ );
+
+
+/**
Returns the lower 32-bits of a Machine Specific Register(MSR).
Reads and returns the lower 32-bits of the MSR specified by Index.
diff --git a/MdePkg/Library/BaseLib/Ia32/DisableCache.c b/MdePkg/Library/BaseLib/Ia32/DisableCache.c index d2d028a93d..4ee3b88fdc 100644 --- a/MdePkg/Library/BaseLib/Ia32/DisableCache.c +++ b/MdePkg/Library/BaseLib/Ia32/DisableCache.c @@ -13,10 +13,10 @@ **/
/**
- Disables caches.
+ Set CD bit and clear NW bit of CR0 followed by a WBINVD.
- Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a
- WBINVD instruction.
+ Disables the caches by setting the CD bit of CR0 to 1, clearing the NW bit of CR0 to 0,
+ and executing a WBINVD instruction. This function is only available on IA-32 and x64.
**/
VOID
diff --git a/MdePkg/Library/BaseLib/Ia32/EnableCache.c b/MdePkg/Library/BaseLib/Ia32/EnableCache.c index 59e2b43213..dab89039f0 100644 --- a/MdePkg/Library/BaseLib/Ia32/EnableCache.c +++ b/MdePkg/Library/BaseLib/Ia32/EnableCache.c @@ -13,10 +13,10 @@ **/
/**
- Enabled caches.
+ Perform a WBINVD and clear both the CD and NW bits of CR0.
- Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear
- the NW bit of CR0 to 0
+ Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
+ bits of CR0 to 0. This function is only available on IA-32 and x64.
**/
VOID
|