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mimisc.c File Reference

#include "mi.h"

Go to the source code of this file.

Classes

struct  _CACHE_ATTRIBUTE_DESCRIPTOR

Typedefs

typedef enum _MEM_TYPES MEM_TYPES
typedef _CACHE_ATTRIBUTE_DESCRIPTOR CACHE_ATTRIBUTE_DESCRIPTOR
typedef _CACHE_ATTRIBUTE_DESCRIPTOR * PCACHE_ATTRIBUTE_DESCRIPTOR

Enumerations

enum  _MEM_TYPES {
  RegularMemory, MemoryMappedIo, VideoDisplayBuffer, IoPort,
  RomMemory
}

Functions

ULONG MiCheckMemoryAttribute (IN PFN_NUMBER PageFrameNumber)
 MiDisableCaching (IN PMMPTE PointerPte;)

Variables

LIST_ENTRY MmCacheAttributeDescriptorListHead
ULONG MmDefaultCacheAttribute = MM_PTE_MA_WBU
UCHAR MmDisableCache [16]

Typedef Documentation

typedef struct _CACHE_ATTRIBUTE_DESCRIPTOR CACHE_ATTRIBUTE_DESCRIPTOR
 

typedef enum _MEM_TYPES MEM_TYPES
 

typedef struct _CACHE_ATTRIBUTE_DESCRIPTOR * PCACHE_ATTRIBUTE_DESCRIPTOR
 

Enumeration Type Documentation

enum _MEM_TYPES
 

Enumeration values:
RegularMemory 
MemoryMappedIo 
VideoDisplayBuffer 
IoPort 
RomMemory 

Definition at line 31 of file mimisc.c. 

00031                         {
00032     RegularMemory,
00033     MemoryMappedIo,
00034     VideoDisplayBuffer,
00035     IoPort,
00036     RomMemory
00037 } MEM_TYPES;

Function Documentation

ULONG MiCheckMemoryAttribute (  IN PFN_NUMBER  PageFrameNumber  ) 
 

Definition at line 60 of file mimisc.c.

References MmCacheAttributeDescriptorListHead, and MmDefaultCacheAttribute.

Referenced by MiDisableCaching(). 

00066                   :
00067 
00068     This function examines the physical address which is given 
00069     by the physical page frame number, and returns the cache 
00070     attributes type for that page. The returned value is used to specify 
00071     the MemoryAttribute field in the HARDWARE_PTE structure to map 
00072     that page.
00073      
00074     This function searches the cache descriptor attribute link 
00075     lists to see if the specific cache attribute is defined for 
00076     that physical address range.  
00077 
00078     If the physical address range is not defined in the cache 
00079     descriptor attribute link lists, returns the default memory 
00080     attribute.
00081 
00082 Arguments:
00083 
00084     PageFrameIndex - Supplies the physical page frame number to be
00085                      examined for the cache attribute.
00086 
00087 Return Value: 
00088 
00089     Returns a cache attribute type for the supplied physical page 
00090     frame number. 
00091  
00092 Environment:
00093 
00094     Kernel Mode Only.
00095 
00096 --*/
00097 
00098 {
00099    PLIST_ENTRY NextMd;
00100 
00101    NextMd = MmCacheAttributeDescriptorListHead.Flink;
00102 
00103    While (NextMd != MmCacheAttributeDescriptorListHead) {
00104 
00105        CacheAttributeDescriptor = CONTAINING_RECORD(NextMd,
00106                                                      CACHE_ATTRIBUTE_DESCRIPTOR,
00107                                                      ListEntry);
00108 
00109        if ((PageFrameNumber >= CacheAttributeDescriptor.BasePage) ||
00110            (PageFrameNumber < CacheAttributeDescriptor.PageCount)) {
00111 
00112            return (CacheAttributeDescriptor.CacheAttribute);
00113            
00114        }
00115 
00116        NextMd = CacheAttributeDescriptor->ListEntry.Flink;
00117    }
00118 
00119    //
00120    // if the cache memory descriptor is not found, 
00121    // return the default cache attribute, MmDefaultCacheAttribute.
00122    //
00123           
00124    return (MmDefaultCacheAttribute);
00125 
00126 }

MiDisableCaching (  IN PMMPTE PointerPte;   ) 
 

Definition at line 139 of file mimisc.c.

References MiCheckMemoryAttribute(), and MmDisableCache. 

00145                    :
00146 
00147     This macro takes a valid PTE and sets the caching state to be
00148     disabled.
00149 
00150 Argments
00151 
00152     PTE - Supplies a pointer to the valid PTE.
00153   
00154 Return Value:
00155 
00156     None.
00157 
00158 Environment:
00159 
00160     Kernel mode
00161 
00162 --*/
00163 
00164 {
00165     ULONG CacheAttribute;
00166 
00167     CacheAttribute = MiCheckMemoryAttribute(TempPte.u.Hard.PageFrameNumber);
00168 
00169     if (MmDisableCache[CacheAttribute]) {
00170         
00171         //
00172         // The returned CacheAttributes indicate uncachable.
00173         //
00174 
00175         PointerPte->u.Hard.MemAttribute = CacheAttribute;
00176 
00177     } else {
00178 
00179         //
00180         // Set the most conservative cache memory attribute,
00181         // UCO (Uncachable, Non-coalescing, Sequential & Non-
00182         // speculative and Ordered.
00183         //
00184         
00185         PointerPte->u.Hard.MemAttribute = MM_PTE_MA_UCO;
00186 
00187     }
00188 }

Variable Documentation

LIST_ENTRY MmCacheAttributeDescriptorListHead
 

Definition at line 49 of file mimisc.c.

Referenced by MiCheckMemoryAttribute().

ULONG MmDefaultCacheAttribute = MM_PTE_MA_WBU
 

Definition at line 55 of file mimisc.c.

Referenced by MiCheckMemoryAttribute().

UCHAR MmDisableCache[16]
 

Initial value:

 {0, 0, 0, 0, 0, 0, 0, 0
                           1, 1, 0, 1, 0, 1, 0, 0}

Definition at line 134 of file mimisc.c.

Referenced by MiDisableCaching().

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