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1da177e4 LT |
1 | /* |
2 | * | |
3 | * This file is subject to the terms and conditions of the GNU General Public | |
4 | * License. See the file "COPYING" in the main directory of this archive | |
5 | * for more details. | |
6 | * | |
7 | * Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com) | |
8 | * | |
9 | */ | |
1da177e4 | 10 | #include <asm/psw.h> |
896a3756 | 11 | #include <asm/assembly.h> |
1da177e4 LT |
12 | |
13 | .section .bss | |
14 | .export real_stack | |
15 | .export real32_stack | |
16 | .export real64_stack | |
17 | .align 64 | |
18 | real_stack: | |
19 | real32_stack: | |
20 | real64_stack: | |
21 | .block 8192 | |
22 | ||
23 | #ifdef __LP64__ | |
24 | # define REG_SZ 8 | |
25 | #else | |
26 | # define REG_SZ 4 | |
27 | #endif | |
28 | ||
29 | #define N_SAVED_REGS 9 | |
30 | ||
31 | save_cr_space: | |
32 | .block REG_SZ * N_SAVED_REGS | |
33 | save_cr_end: | |
34 | ||
35 | ||
36 | /************************ 32-bit real-mode calls ***********************/ | |
37 | /* This can be called in both narrow and wide kernels */ | |
38 | ||
39 | .text | |
40 | ||
41 | .export real32_call_asm | |
42 | ||
43 | /* unsigned long real32_call_asm(unsigned int *sp, | |
44 | * unsigned int *arg0p, | |
45 | * unsigned int iodc_fn) | |
46 | * sp is value of stack pointer to adopt before calling PDC (virt) | |
47 | * arg0p points to where saved arg values may be found | |
48 | * iodc_fn is the IODC function to call | |
49 | */ | |
50 | ||
51 | real32_call_asm: | |
52 | STREG %rp, -RP_OFFSET(%sp) /* save RP */ | |
53 | #ifdef __LP64__ | |
54 | callee_save | |
55 | ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */ | |
56 | STREG %r27, -1*REG_SZ(%sp) | |
57 | STREG %r29, -2*REG_SZ(%sp) | |
58 | #endif | |
59 | STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */ | |
60 | copy %arg0, %sp /* adopt the real-mode SP */ | |
61 | ||
62 | /* save iodc_fn */ | |
63 | copy %arg2, %r31 | |
64 | ||
65 | /* load up the arg registers from the saved arg area */ | |
66 | /* 32-bit calling convention passes first 4 args in registers */ | |
67 | ldw 0(%arg1), %arg0 /* note overwriting arg0 */ | |
68 | ldw -8(%arg1), %arg2 | |
69 | ldw -12(%arg1), %arg3 | |
70 | ldw -4(%arg1), %arg1 /* obviously must do this one last! */ | |
71 | ||
72 | tophys_r1 %sp | |
73 | ||
74 | b,l rfi_virt2real,%r2 | |
75 | nop | |
76 | ||
77 | b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ | |
78 | nop | |
79 | ||
80 | #ifdef __LP64__ | |
81 | rsm PSW_SM_W, %r0 /* go narrow */ | |
82 | #endif | |
83 | ||
84 | load32 PA(ric_ret), %r2 | |
85 | bv 0(%r31) | |
86 | nop | |
87 | ric_ret: | |
88 | #ifdef __LP64__ | |
89 | ssm PSW_SM_W, %r0 /* go wide */ | |
90 | #endif | |
91 | /* restore CRs before going virtual in case we page fault */ | |
92 | b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ | |
93 | nop | |
94 | ||
95 | b,l rfi_real2virt,%r2 | |
96 | nop | |
97 | ||
98 | tovirt_r1 %sp | |
99 | LDREG -REG_SZ(%sp), %sp /* restore SP */ | |
100 | #ifdef __LP64__ | |
101 | LDREG -1*REG_SZ(%sp), %r27 | |
102 | LDREG -2*REG_SZ(%sp), %r29 | |
103 | ldo -2*REG_SZ(%sp), %sp | |
104 | callee_rest | |
105 | #endif | |
106 | LDREG -RP_OFFSET(%sp), %rp /* restore RP */ | |
107 | bv 0(%rp) | |
108 | nop | |
109 | ||
110 | ||
111 | # define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where) | |
112 | # define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r | |
113 | ||
114 | .text | |
115 | save_control_regs: | |
116 | load32 PA(save_cr_space), %r28 | |
117 | PUSH_CR(%cr24, %r28) | |
118 | PUSH_CR(%cr25, %r28) | |
119 | PUSH_CR(%cr26, %r28) | |
120 | PUSH_CR(%cr27, %r28) | |
121 | PUSH_CR(%cr28, %r28) | |
122 | PUSH_CR(%cr29, %r28) | |
123 | PUSH_CR(%cr30, %r28) | |
124 | PUSH_CR(%cr31, %r28) | |
125 | PUSH_CR(%cr15, %r28) | |
126 | bv 0(%r2) | |
127 | nop | |
128 | ||
129 | restore_control_regs: | |
130 | load32 PA(save_cr_end), %r26 | |
131 | POP_CR(%cr15, %r26) | |
132 | POP_CR(%cr31, %r26) | |
133 | POP_CR(%cr30, %r26) | |
134 | POP_CR(%cr29, %r26) | |
135 | POP_CR(%cr28, %r26) | |
136 | POP_CR(%cr27, %r26) | |
137 | POP_CR(%cr26, %r26) | |
138 | POP_CR(%cr25, %r26) | |
139 | POP_CR(%cr24, %r26) | |
140 | bv 0(%r2) | |
141 | nop | |
142 | ||
143 | /* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for | |
144 | * more general-purpose use by the several places which need RFIs | |
145 | */ | |
146 | .align 128 | |
147 | .text | |
148 | rfi_virt2real: | |
149 | /* switch to real mode... */ | |
896a3756 GG |
150 | rsm PSW_SM_I,%r0 |
151 | load32 PA(rfi_v2r_1), %r1 | |
1da177e4 LT |
152 | nop |
153 | nop | |
154 | nop | |
155 | nop | |
156 | nop | |
157 | ||
896a3756 | 158 | rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */ |
1da177e4 LT |
159 | mtctl %r0, %cr17 /* Clear IIASQ tail */ |
160 | mtctl %r0, %cr17 /* Clear IIASQ head */ | |
1da177e4 LT |
161 | mtctl %r1, %cr18 /* IIAOQ head */ |
162 | ldo 4(%r1), %r1 | |
163 | mtctl %r1, %cr18 /* IIAOQ tail */ | |
164 | load32 REAL_MODE_PSW, %r1 | |
165 | mtctl %r1, %cr22 | |
166 | rfi | |
167 | ||
168 | nop | |
169 | nop | |
170 | nop | |
171 | nop | |
172 | nop | |
173 | nop | |
174 | nop | |
175 | nop | |
176 | rfi_v2r_1: | |
177 | tophys_r1 %r2 | |
178 | bv 0(%r2) | |
179 | nop | |
180 | ||
181 | .text | |
182 | .align 128 | |
183 | rfi_real2virt: | |
896a3756 GG |
184 | rsm PSW_SM_I,%r0 |
185 | load32 (rfi_r2v_1), %r1 | |
1da177e4 LT |
186 | nop |
187 | nop | |
188 | nop | |
189 | nop | |
190 | nop | |
191 | ||
192 | rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */ | |
193 | mtctl %r0, %cr17 /* Clear IIASQ tail */ | |
194 | mtctl %r0, %cr17 /* Clear IIASQ head */ | |
1da177e4 LT |
195 | mtctl %r1, %cr18 /* IIAOQ head */ |
196 | ldo 4(%r1), %r1 | |
197 | mtctl %r1, %cr18 /* IIAOQ tail */ | |
198 | load32 KERNEL_PSW, %r1 | |
199 | mtctl %r1, %cr22 | |
200 | rfi | |
201 | ||
202 | nop | |
203 | nop | |
204 | nop | |
205 | nop | |
206 | nop | |
207 | nop | |
208 | nop | |
209 | nop | |
210 | rfi_r2v_1: | |
211 | tovirt_r1 %r2 | |
212 | bv 0(%r2) | |
213 | nop | |
214 | ||
215 | #ifdef __LP64__ | |
216 | ||
217 | /************************ 64-bit real-mode calls ***********************/ | |
218 | /* This is only usable in wide kernels right now and will probably stay so */ | |
219 | .text | |
220 | .export real64_call_asm | |
221 | /* unsigned long real64_call_asm(unsigned long *sp, | |
222 | * unsigned long *arg0p, | |
223 | * unsigned long fn) | |
224 | * sp is value of stack pointer to adopt before calling PDC (virt) | |
225 | * arg0p points to where saved arg values may be found | |
226 | * iodc_fn is the IODC function to call | |
227 | */ | |
228 | real64_call_asm: | |
229 | std %rp, -0x10(%sp) /* save RP */ | |
230 | std %sp, -8(%arg0) /* save SP on real-mode stack */ | |
231 | copy %arg0, %sp /* adopt the real-mode SP */ | |
232 | ||
233 | /* save fn */ | |
234 | copy %arg2, %r31 | |
235 | ||
236 | /* set up the new ap */ | |
237 | ldo 64(%arg1), %r29 | |
238 | ||
239 | /* load up the arg registers from the saved arg area */ | |
240 | /* 32-bit calling convention passes first 4 args in registers */ | |
241 | ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */ | |
242 | ldd 2*REG_SZ(%arg1), %arg2 | |
243 | ldd 3*REG_SZ(%arg1), %arg3 | |
244 | ldd 4*REG_SZ(%arg1), %r22 | |
245 | ldd 5*REG_SZ(%arg1), %r21 | |
246 | ldd 6*REG_SZ(%arg1), %r20 | |
247 | ldd 7*REG_SZ(%arg1), %r19 | |
248 | ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */ | |
249 | ||
250 | tophys_r1 %sp | |
251 | ||
252 | b,l rfi_virt2real,%r2 | |
253 | nop | |
254 | ||
255 | b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ | |
256 | nop | |
257 | ||
258 | load32 PA(r64_ret), %r2 | |
259 | bv 0(%r31) | |
260 | nop | |
261 | r64_ret: | |
262 | /* restore CRs before going virtual in case we page fault */ | |
263 | b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ | |
264 | nop | |
265 | ||
266 | b,l rfi_real2virt,%r2 | |
267 | nop | |
268 | ||
269 | tovirt_r1 %sp | |
270 | ldd -8(%sp), %sp /* restore SP */ | |
271 | ldd -0x10(%sp), %rp /* restore RP */ | |
272 | bv 0(%rp) | |
273 | nop | |
274 | ||
275 | #endif | |
276 | ||
277 | .export pc_in_user_space | |
278 | .text | |
279 | /* Doesn't belong here but I couldn't find a nicer spot. */ | |
280 | /* Should never get called, only used by profile stuff in time.c */ | |
281 | pc_in_user_space: | |
282 | bv,n 0(%rp) | |
283 | nop | |
284 | ||
285 | ||
286 | .export __canonicalize_funcptr_for_compare | |
287 | .text | |
288 | /* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html | |
289 | ** GCC 3.3 and later has a new function in libgcc.a for | |
290 | ** comparing function pointers. | |
291 | */ | |
292 | __canonicalize_funcptr_for_compare: | |
293 | #ifdef __LP64__ | |
294 | bve (%r2) | |
295 | #else | |
296 | bv %r0(%r2) | |
297 | #endif | |
298 | copy %r26,%r28 |