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1 | # |
2 | # Copyright (c) 2004, Intel Corporation | |
3 | # All rights reserved. This program and the accompanying materials | |
4 | # are licensed and made available under the terms and conditions of the BSD License | |
5 | # which accompanies this distribution. The full text of the license may be found at | |
6 | # http://opensource.org/licenses/bsd-license.php | |
7 | # | |
8 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
9 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
10 | # | |
11 | # Module Name: | |
12 | # | |
13 | # ProcessorAsms.Asm | |
14 | # | |
15 | # | |
16 | # | |
17 | #include "EfiBind.h" | |
18 | #------------------------------------------------------------------------------ | |
19 | ||
20 | .686P: | |
21 | .MMX: | |
22 | #.MODEL SMALL | |
23 | .CODE: | |
24 | #------------------------------------------------------------------------------ | |
25 | ||
26 | .globl ASM_PFX(TransferControlSetJump) | |
27 | .globl ASM_PFX(TransferControlLongJump) | |
28 | .globl ASM_PFX(SwitchStacks) | |
29 | .globl ASM_PFX(SwitchIplStacks) | |
30 | ||
31 | #define EFI_SUCCESS 0 | |
32 | #define EFI_WARN_RETURN_FROM_LONG_JUMP 5 | |
33 | ||
34 | # | |
35 | # typedef struct { | |
36 | # UINT32 ebx; | |
37 | # UINT32 esi; | |
38 | # UINT32 edi; | |
39 | # UINT32 ebp; | |
40 | # UINT32 esp; | |
41 | # UINT32 eip; | |
42 | #} EFI_JUMP_BUFFER; | |
43 | # | |
44 | ||
45 | #typedef | |
46 | #EFI_STATUS | |
47 | #(EFIAPI *EFI_PEI_TRANSFER_CONTROL_SET_JUMP) ( | |
48 | # IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This, | |
49 | # OUT EFI_JUMP_BUFFER *Context | |
50 | # ); | |
51 | # | |
52 | #Routine Description: | |
53 | # | |
54 | # This routine implements the IA32 variant of the SetJump call. Its | |
55 | # responsibility is to store system state information for a possible | |
56 | # subsequent LongJump. | |
57 | # | |
58 | #Arguments: | |
59 | # | |
60 | # Pointer to CPU context save buffer. | |
61 | # | |
62 | #Returns: | |
63 | # | |
64 | # EFI_SUCCESS | |
65 | # | |
66 | ASM_PFX(TransferControlSetJump): | |
67 | push %ebp | |
68 | mov %esp,%ebp | |
69 | mov 0x8(%ebp),%eax | |
70 | mov 0xc(%ebp),%ecx | |
71 | mov %ebx,(%ecx) | |
72 | mov %esi,0x4(%ecx) | |
73 | mov %edi,0x8(%ecx) | |
74 | mov 0x0(%ebp),%eax | |
75 | mov %eax,0xc(%ecx) | |
76 | lea 0x4(%ebp),%eax | |
77 | mov %eax,0x10(%ecx) | |
78 | mov 0x4(%ebp),%eax | |
79 | mov %eax,0x14(%ecx) | |
80 | mov $0x0,%eax | |
81 | leave | |
82 | ret | |
83 | ||
84 | #typedef | |
85 | #EFI_STATUS | |
86 | #(EFIAPI *EFI_PEI_TRANSFER_CONTROL_LONG_JUMP) ( | |
87 | # IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This, | |
88 | # IN EFI_JUMP_BUFFER *Context | |
89 | # ); | |
90 | # | |
91 | # Routine Description: | |
92 | # | |
93 | # This routine implements the IA32 variant of the LongJump call. Its | |
94 | # responsibility is restore the system state to the Context Buffer and | |
95 | # pass control back. | |
96 | # | |
97 | # Arguments: | |
98 | # | |
99 | # Pointer to CPU context save buffer. | |
100 | # | |
101 | # Returns: | |
102 | # | |
103 | # EFI_WARN_RETURN_FROM_LONG_JUMP | |
104 | # | |
105 | ||
106 | ASM_PFX(TransferControlLongJump): | |
107 | push %ebp | |
108 | mov %esp,%ebp | |
109 | push %ebx | |
110 | push %esi | |
111 | push %edi | |
112 | mov 0x8(%ebp),%eax | |
113 | mov $0x5,%eax | |
114 | mov 0xc(%ebp),%ecx | |
115 | mov (%ecx),%ebx | |
116 | mov 0x4(%ecx),%esi | |
117 | mov 0x8(%ecx),%edi | |
118 | mov 0xc(%ecx),%ebp | |
119 | mov 0x10(%ecx),%esp | |
120 | add $0x4,%esp | |
121 | jmp *0x14(%ecx) | |
122 | mov $0x5,%eax | |
123 | pop %edi | |
124 | pop %esi | |
125 | pop %ebx | |
126 | leave | |
127 | ret | |
128 | ||
129 | # | |
130 | # Routine Description: | |
131 | # This allows the caller to switch the stack and goes to the new entry point | |
132 | # | |
133 | # Arguments: | |
134 | # EntryPoint - Pointer to the location to enter | |
135 | # Parameter - Parameter to pass in | |
136 | # NewStack - New Location of the stack | |
137 | # NewBsp - New BSP | |
138 | # | |
139 | # Returns: | |
140 | # | |
141 | # Nothing. Goes to the Entry Point passing in the new parameters | |
142 | # | |
143 | #SwitchStacks PROC C \ | |
144 | # EntryPoint:PTR DWORD, \ | |
145 | # Parameter:DWORD, \ | |
146 | # NewStack:PTR DWORD, \ | |
147 | # NewBsp:PTR DWORD | |
148 | ASM_PFX(SwitchStacks): | |
149 | push %ebp | |
150 | mov %esp,%ebp | |
151 | push %ebx | |
152 | mov 0x14(%ebp),%eax | |
153 | mov 0xc(%ebp),%ebx | |
154 | mov 0x8(%ebp),%ecx | |
155 | mov 0x10(%ebp),%eax | |
156 | mov %eax,%esp | |
157 | push %ebx | |
158 | push $0x0 | |
159 | jmp *%ecx | |
160 | pop %ebx | |
161 | leave | |
162 | ret | |
163 | ||
164 | ||
165 | ||
166 | ||
167 | # | |
168 | # Routine Description: | |
169 | # This allows the caller to switch the stack and goes to the new entry point | |
170 | # | |
171 | # Arguments: | |
172 | # EntryPoint - Pointer to the location to enter | |
173 | # Parameter1/Parameter2 - Parameter to pass in | |
174 | # NewStack - New Location of the stack | |
175 | # NewBsp - New BSP | |
176 | # | |
177 | # Returns: | |
178 | # | |
179 | # Nothing. Goes to the Entry Point passing in the new parameters | |
180 | # | |
181 | #SwitchIplStacks PROC C \ | |
182 | # EntryPoint:PTR DWORD, \ | |
183 | # Parameter1:DWORD, \ | |
184 | # Parameter2:DWORD, \ | |
185 | # NewStack:PTR DWORD, \ | |
186 | # NewBsp:PTR DWORD | |
187 | ASM_PFX(SwitchIplStacks): | |
188 | push %ebp | |
189 | mov %esp,%ebp | |
190 | push %ebx | |
191 | mov 0x18(%ebp),%eax | |
192 | mov 0xc(%ebp),%ebx | |
193 | mov 0x10(%ebp),%edx | |
194 | mov 0x8(%ebp),%ecx | |
195 | mov 0x14(%ebp),%eax | |
196 | mov %eax,%esp | |
197 | push %edx | |
198 | push %ebx | |
199 | call *%ecx | |
200 | pop %ebx | |
201 | leave | |
202 | ret | |
203 | ||
204 | #SwitchIplStacks ENDP | |
205 | ||
206 | ||
207 |