boot/environ/lib/io/blkcache.c

   1 /*
   2  * COPYRIGHT:       See COPYING.ARM in the top level directory
   3  * PROJECT:         ReactOS UEFI Boot Library
   4  * FILE:            boot/environ/lib/io/blkcache.c
   5  * PURPOSE:         Boot Library Block Cache Management Routines
   6  * PROGRAMMER:      Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include "bl.h"
  12
  13 /* DATA VARIABLES ************************************************************/
  14
  15 ULONG BcpBlockAllocatorHandle;
  16 ULONG BcpHashTableId;
  17
  18 /* FUNCTIONS *****************************************************************/
  19
  20 NTSTATUS
  21 BcpDestroy (
  22     VOID
  23     )
  24 {
  25     //BcpPurgeCacheEntries();
  26     //return BlpMmDeleteBlockAllocator(BcpBlockAllocatorHandle);
  27     EfiPrintf(L"Destructor for block cache not yet implemented\r\n");
  28     return STATUS_NOT_IMPLEMENTED;
  29 }
  30
  31 BOOLEAN
  32 BcpCompareKey (
  33     _In_ PBL_HASH_ENTRY Entry1,
  34     _In_ PBL_HASH_ENTRY Entry2
  35     )
  36 {
  37     PULONG Value1, Value2;
  38
  39     Value1 = Entry1->Value;
  40     Value2 = Entry2->Value;
  41     return Entry1->Size == Entry2->Size && Entry1->Flags == Entry2->Flags && *Value1 == *Value2 && Value1[1] == Value2[1] && Value1[2] == Value2[2];
  42 }
  43
  44 ULONG
  45 BcpHashFunction (
  46     _In_ PBL_HASH_ENTRY Entry,
  47     _In_ ULONG TableSize
  48     )
  49 {
  50     ULONG i, j, ValueHash;
  51     PUCHAR ValueBuffer;
  52
  53     j = 0;
  54     ValueHash = 0;
  55     i = 0;
  56
  57     ValueBuffer = Entry->Value;
  58
  59     do
  60     {
  61         ValueHash += ValueBuffer[i++];
  62     } while (i < 8);
  63
  64     do
  65     {
  66         ValueHash += ValueBuffer[j++ + 8];
  67     } while (j < 4);
  68
  69     return ValueHash % TableSize;
  70 }
  71
  72 NTSTATUS
  73 BcInitialize (
  74     VOID
  75     )
  76 {
  77     NTSTATUS Status;
  78
  79     Status = BlHtCreate(50, BcpHashFunction, BcpCompareKey, &BcpHashTableId);
  80     if (!NT_SUCCESS(Status))
  81     {
  82         goto Quickie;
  83     }
  84
  85     BcpBlockAllocatorHandle = BlpMmCreateBlockAllocator();
  86     if (BcpBlockAllocatorHandle == -1)
  87     {
  88         Status = STATUS_UNSUCCESSFUL;
  89         goto Quickie;
  90     }
  91
  92     Status = BlpIoRegisterDestroyRoutine(BcpDestroy);
  93     if (Status >= 0)
  94     {
  95         return Status;
  96     }
  97
  98 Quickie:
  99     EfiPrintf(L"Failure path not yet implemented\r\n");
 100 #if 0
 101     if (BcpHashTableId != -1)
 102     {
 103         BlHtDestroy(BcpHashTableId);
 104     }
 105     if (BcpBlockAllocatorHandle != -1)
 106     {
 107         BlpMmDeleteBlockAllocator(BcpBlockAllocatorHandle);
 108     }
 109 #endif
 110     return Status;
 111 }