xref: /reactos/boot/environ/lib/io/blkcache.c (revision 845faec4) 
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 }
112