]>
Commit | Line | Data |
---|---|---|
478db76b | 1 | ;/*++\r |
2 | ;\r | |
4ea9375a HT |
3 | ;Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r |
4 | ;This program and the accompanying materials \r | |
478db76b | 5 | ;are licensed and made available under the terms and conditions of the BSD License \r |
6 | ;which accompanies this distribution. The full text of the license may be found at \r | |
7 | ;http://opensource.org/licenses/bsd-license.php \r | |
8 | ; \r | |
9 | ;THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | ;WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | ;\r | |
12 | ;Module Name:\r | |
13 | ;\r | |
14 | ; EfiSetMem.asm\r | |
15 | ;\r | |
16 | ;Abstract:\r | |
17 | ;\r | |
18 | ; This is the code that supports IA32-optimized SetMem service\r | |
19 | ;\r | |
20 | ;--*/\r | |
21 | ;---------------------------------------------------------------------------\r | |
22 | .686\r | |
23 | .model flat,C\r | |
24 | .mmx\r | |
25 | .code\r | |
26 | \r | |
27 | ;---------------------------------------------------------------------------\r | |
28 | ;VOID\r | |
29 | ;EfiCommonLibSetMem (\r | |
30 | ; IN VOID *Buffer,\r | |
31 | ; IN UINTN Count,\r | |
32 | ; IN UINT8 Value\r | |
33 | ; )\r | |
34 | ;/*++\r | |
35 | ;\r | |
36 | ;Input: VOID *Buffer - Pointer to buffer to write\r | |
37 | ; UINTN Count - Number of bytes to write\r | |
38 | ; UINT8 Value - Value to write\r | |
39 | ;\r | |
40 | ;Output: None.\r | |
41 | ;\r | |
42 | ;Saves:\r | |
43 | ;\r | |
44 | ;Modifies:\r | |
45 | ;\r | |
46 | ;Description: This function is an optimized set-memory function.\r | |
47 | ;\r | |
48 | ;Notes: This function tries to set memory 8 bytes at a time. As a result, \r | |
49 | ; it first picks up any misaligned bytes, then words, before getting \r | |
50 | ; in the main loop that does the 8-byte clears.\r | |
51 | ;\r | |
52 | ;--*/\r | |
53 | EfiCommonLibSetMem PROC\r | |
54 | \r | |
55 | push ebp\r | |
56 | mov ebp, esp\r | |
57 | sub esp, 10h; Reserve space for local variable UINT64 QWordValue @[ebp - 10H] & UINT64 MmxSave @[ebp - 18H]\r | |
58 | push ebx\r | |
59 | push edi\r | |
60 | \r | |
61 | mov edx, [ebp + 0Ch] ; Count\r | |
62 | test edx, edx\r | |
63 | je _SetMemDone\r | |
64 | \r | |
65 | push ebx\r | |
66 | \r | |
67 | mov eax, [ebp + 8] ; Buffer\r | |
68 | mov bl, [ebp + 10h] ; Value\r | |
69 | mov edi, eax\r | |
70 | mov bh, bl\r | |
71 | \r | |
72 | cmp edx, 256\r | |
73 | jb _SetRemindingByte\r | |
74 | \r | |
75 | and al, 07h\r | |
76 | test al, al\r | |
77 | je _SetBlock\r | |
78 | \r | |
79 | mov eax, edi\r | |
80 | shr eax, 3\r | |
81 | inc eax\r | |
82 | shl eax, 3\r | |
83 | sub eax, edi\r | |
84 | cmp eax, edx\r | |
85 | jnb _SetRemindingByte\r | |
86 | \r | |
87 | sub edx, eax\r | |
88 | mov ecx, eax\r | |
89 | \r | |
90 | mov al, bl\r | |
91 | rep stosb\r | |
92 | \r | |
93 | _SetBlock:\r | |
94 | mov eax, edx\r | |
95 | shr eax, 6\r | |
96 | test eax, eax\r | |
97 | je _SetRemindingByte\r | |
98 | \r | |
99 | shl eax, 6\r | |
100 | sub edx, eax\r | |
101 | shr eax, 6\r | |
102 | \r | |
103 | mov WORD PTR [ebp - 10H], bx ; QWordValue[0]\r | |
104 | mov WORD PTR [ebp - 10H + 2], bx ; QWordValue[2]\r | |
105 | mov WORD PTR [ebp - 10H + 4], bx ; QWordValue[4]\r | |
106 | mov WORD PTR [ebp - 10H + 6], bx ; QWordValue[6]\r | |
107 | \r | |
108 | \r | |
109 | movq [ebp - 8], mm0 ; Save mm0 to MmxSave\r | |
110 | movq mm0, [ebp - 10H] ; Load QWordValue to mm0\r | |
111 | \r | |
112 | _B:\r | |
113 | movq QWORD PTR ds:[edi], mm0\r | |
114 | movq QWORD PTR ds:[edi+8], mm0\r | |
115 | movq QWORD PTR ds:[edi+16], mm0\r | |
116 | movq QWORD PTR ds:[edi+24], mm0\r | |
117 | movq QWORD PTR ds:[edi+32], mm0\r | |
118 | movq QWORD PTR ds:[edi+40], mm0\r | |
119 | movq QWORD PTR ds:[edi+48], mm0\r | |
120 | movq QWORD PTR ds:[edi+56], mm0\r | |
121 | add edi, 64\r | |
122 | dec eax\r | |
123 | jnz _B\r | |
124 | \r | |
125 | ; Restore mm0\r | |
126 | movq mm0, [ebp - 8] ; Restore MmxSave to mm0\r | |
127 | emms ; Exit MMX Instruction\r | |
128 | \r | |
129 | _SetRemindingByte:\r | |
130 | mov ecx, edx\r | |
131 | \r | |
132 | mov eax, ebx\r | |
133 | shl eax, 16\r | |
134 | mov ax, bx\r | |
135 | shr ecx, 2\r | |
136 | rep stosd\r | |
137 | \r | |
138 | mov ecx, edx\r | |
139 | and ecx, 3\r | |
140 | rep stosb\r | |
141 | \r | |
142 | pop ebx\r | |
143 | \r | |
144 | _SetMemDone:\r | |
145 | \r | |
146 | pop edi\r | |
147 | pop ebx\r | |
148 | leave\r | |
149 | ret\r | |
150 | \r | |
151 | EfiCommonLibSetMem ENDP\r | |
152 | END\r |