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
BcpDestroy(VOID)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
BcpCompareKey(_In_ PBL_HASH_ENTRY Entry1,_In_ PBL_HASH_ENTRY Entry2)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
BcpHashFunction(_In_ PBL_HASH_ENTRY Entry,_In_ ULONG TableSize)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
BcInitialize(VOID)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 }
112