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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 | */ | |
413059f2 | 10 | |
6c86cb82 | 11 | #include <asm/pdc.h> |
1da177e4 | 12 | #include <asm/psw.h> |
896a3756 | 13 | #include <asm/assembly.h> |
6c86cb82 | 14 | #include <asm/asm-offsets.h> |
1da177e4 | 15 | |
8e9e9844 HD |
16 | #include <linux/linkage.h> |
17 | ||
1da177e4 | 18 | .export real_stack |
1da177e4 | 19 | .export real64_stack |
4add395b | 20 | __PAGE_ALIGNED_BSS |
1da177e4 | 21 | real_stack: |
1da177e4 LT |
22 | real64_stack: |
23 | .block 8192 | |
24 | ||
1da177e4 | 25 | #define N_SAVED_REGS 9 |
4add395b | 26 | .section .bss |
1da177e4 LT |
27 | save_cr_space: |
28 | .block REG_SZ * N_SAVED_REGS | |
29 | save_cr_end: | |
30 | ||
31 | ||
32 | /************************ 32-bit real-mode calls ***********************/ | |
33 | /* This can be called in both narrow and wide kernels */ | |
34 | ||
dfcf753b | 35 | .text |
1da177e4 | 36 | |
1da177e4 LT |
37 | /* unsigned long real32_call_asm(unsigned int *sp, |
38 | * unsigned int *arg0p, | |
39 | * unsigned int iodc_fn) | |
40 | * sp is value of stack pointer to adopt before calling PDC (virt) | |
41 | * arg0p points to where saved arg values may be found | |
42 | * iodc_fn is the IODC function to call | |
43 | */ | |
44 | ||
f39cce65 | 45 | ENTRY_CFI(real32_call_asm) |
1da177e4 | 46 | STREG %rp, -RP_OFFSET(%sp) /* save RP */ |
413059f2 | 47 | #ifdef CONFIG_64BIT |
1da177e4 LT |
48 | callee_save |
49 | ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */ | |
50 | STREG %r27, -1*REG_SZ(%sp) | |
51 | STREG %r29, -2*REG_SZ(%sp) | |
52 | #endif | |
53 | STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */ | |
54 | copy %arg0, %sp /* adopt the real-mode SP */ | |
55 | ||
56 | /* save iodc_fn */ | |
57 | copy %arg2, %r31 | |
58 | ||
59 | /* load up the arg registers from the saved arg area */ | |
60 | /* 32-bit calling convention passes first 4 args in registers */ | |
61 | ldw 0(%arg1), %arg0 /* note overwriting arg0 */ | |
62 | ldw -8(%arg1), %arg2 | |
63 | ldw -12(%arg1), %arg3 | |
64 | ldw -4(%arg1), %arg1 /* obviously must do this one last! */ | |
65 | ||
66 | tophys_r1 %sp | |
67 | ||
68 | b,l rfi_virt2real,%r2 | |
69 | nop | |
70 | ||
71 | b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ | |
72 | nop | |
73 | ||
413059f2 | 74 | #ifdef CONFIG_64BIT |
1da177e4 LT |
75 | rsm PSW_SM_W, %r0 /* go narrow */ |
76 | #endif | |
77 | ||
78 | load32 PA(ric_ret), %r2 | |
79 | bv 0(%r31) | |
80 | nop | |
81 | ric_ret: | |
413059f2 | 82 | #ifdef CONFIG_64BIT |
1da177e4 LT |
83 | ssm PSW_SM_W, %r0 /* go wide */ |
84 | #endif | |
85 | /* restore CRs before going virtual in case we page fault */ | |
86 | b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ | |
87 | nop | |
88 | ||
89 | b,l rfi_real2virt,%r2 | |
90 | nop | |
91 | ||
92 | tovirt_r1 %sp | |
93 | LDREG -REG_SZ(%sp), %sp /* restore SP */ | |
413059f2 | 94 | #ifdef CONFIG_64BIT |
1da177e4 LT |
95 | LDREG -1*REG_SZ(%sp), %r27 |
96 | LDREG -2*REG_SZ(%sp), %r29 | |
97 | ldo -2*REG_SZ(%sp), %sp | |
98 | callee_rest | |
99 | #endif | |
100 | LDREG -RP_OFFSET(%sp), %rp /* restore RP */ | |
101 | bv 0(%rp) | |
102 | nop | |
f39cce65 | 103 | ENDPROC_CFI(real32_call_asm) |
1da177e4 LT |
104 | |
105 | ||
106 | # define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where) | |
107 | # define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r | |
108 | ||
dfcf753b | 109 | .text |
f39cce65 | 110 | ENTRY_CFI(save_control_regs) |
1da177e4 LT |
111 | load32 PA(save_cr_space), %r28 |
112 | PUSH_CR(%cr24, %r28) | |
113 | PUSH_CR(%cr25, %r28) | |
114 | PUSH_CR(%cr26, %r28) | |
115 | PUSH_CR(%cr27, %r28) | |
116 | PUSH_CR(%cr28, %r28) | |
117 | PUSH_CR(%cr29, %r28) | |
118 | PUSH_CR(%cr30, %r28) | |
119 | PUSH_CR(%cr31, %r28) | |
120 | PUSH_CR(%cr15, %r28) | |
121 | bv 0(%r2) | |
122 | nop | |
f39cce65 | 123 | ENDPROC_CFI(save_control_regs) |
1da177e4 | 124 | |
f39cce65 | 125 | ENTRY_CFI(restore_control_regs) |
1da177e4 LT |
126 | load32 PA(save_cr_end), %r26 |
127 | POP_CR(%cr15, %r26) | |
128 | POP_CR(%cr31, %r26) | |
129 | POP_CR(%cr30, %r26) | |
130 | POP_CR(%cr29, %r26) | |
131 | POP_CR(%cr28, %r26) | |
132 | POP_CR(%cr27, %r26) | |
133 | POP_CR(%cr26, %r26) | |
134 | POP_CR(%cr25, %r26) | |
135 | POP_CR(%cr24, %r26) | |
136 | bv 0(%r2) | |
137 | nop | |
f39cce65 | 138 | ENDPROC_CFI(restore_control_regs) |
1da177e4 LT |
139 | |
140 | /* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for | |
141 | * more general-purpose use by the several places which need RFIs | |
142 | */ | |
dfcf753b | 143 | .text |
e55fb3e7 | 144 | .align 128 |
f39cce65 | 145 | ENTRY_CFI(rfi_virt2real) |
f5213b2c | 146 | #if !defined(BOOTLOADER) |
1da177e4 | 147 | /* switch to real mode... */ |
896a3756 GG |
148 | rsm PSW_SM_I,%r0 |
149 | load32 PA(rfi_v2r_1), %r1 | |
1da177e4 LT |
150 | nop |
151 | nop | |
152 | nop | |
153 | nop | |
154 | nop | |
155 | ||
896a3756 | 156 | rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */ |
1da177e4 LT |
157 | mtctl %r0, %cr17 /* Clear IIASQ tail */ |
158 | mtctl %r0, %cr17 /* Clear IIASQ head */ | |
1da177e4 LT |
159 | mtctl %r1, %cr18 /* IIAOQ head */ |
160 | ldo 4(%r1), %r1 | |
161 | mtctl %r1, %cr18 /* IIAOQ tail */ | |
162 | load32 REAL_MODE_PSW, %r1 | |
163 | mtctl %r1, %cr22 | |
164 | rfi | |
165 | ||
166 | nop | |
167 | nop | |
168 | nop | |
169 | nop | |
170 | nop | |
171 | nop | |
172 | nop | |
173 | nop | |
174 | rfi_v2r_1: | |
175 | tophys_r1 %r2 | |
f5213b2c | 176 | #endif /* defined(BOOTLOADER) */ |
1da177e4 LT |
177 | bv 0(%r2) |
178 | nop | |
f39cce65 | 179 | ENDPROC_CFI(rfi_virt2real) |
1da177e4 | 180 | |
dfcf753b | 181 | .text |
1da177e4 | 182 | .align 128 |
f39cce65 | 183 | ENTRY_CFI(rfi_real2virt) |
f5213b2c | 184 | #if !defined(BOOTLOADER) |
896a3756 GG |
185 | rsm PSW_SM_I,%r0 |
186 | load32 (rfi_r2v_1), %r1 | |
1da177e4 LT |
187 | nop |
188 | nop | |
189 | nop | |
190 | nop | |
191 | nop | |
192 | ||
193 | rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */ | |
194 | mtctl %r0, %cr17 /* Clear IIASQ tail */ | |
195 | mtctl %r0, %cr17 /* Clear IIASQ head */ | |
1da177e4 LT |
196 | mtctl %r1, %cr18 /* IIAOQ head */ |
197 | ldo 4(%r1), %r1 | |
198 | mtctl %r1, %cr18 /* IIAOQ tail */ | |
199 | load32 KERNEL_PSW, %r1 | |
200 | mtctl %r1, %cr22 | |
201 | rfi | |
202 | ||
203 | nop | |
204 | nop | |
205 | nop | |
206 | nop | |
207 | nop | |
208 | nop | |
209 | nop | |
210 | nop | |
211 | rfi_r2v_1: | |
212 | tovirt_r1 %r2 | |
f5213b2c | 213 | #endif /* defined(BOOTLOADER) */ |
1da177e4 LT |
214 | bv 0(%r2) |
215 | nop | |
f39cce65 | 216 | ENDPROC_CFI(rfi_real2virt) |
1da177e4 | 217 | |
413059f2 | 218 | #ifdef CONFIG_64BIT |
1da177e4 LT |
219 | |
220 | /************************ 64-bit real-mode calls ***********************/ | |
221 | /* This is only usable in wide kernels right now and will probably stay so */ | |
dfcf753b | 222 | .text |
1da177e4 LT |
223 | /* unsigned long real64_call_asm(unsigned long *sp, |
224 | * unsigned long *arg0p, | |
225 | * unsigned long fn) | |
226 | * sp is value of stack pointer to adopt before calling PDC (virt) | |
227 | * arg0p points to where saved arg values may be found | |
228 | * iodc_fn is the IODC function to call | |
229 | */ | |
f39cce65 | 230 | ENTRY_CFI(real64_call_asm) |
1da177e4 LT |
231 | std %rp, -0x10(%sp) /* save RP */ |
232 | std %sp, -8(%arg0) /* save SP on real-mode stack */ | |
233 | copy %arg0, %sp /* adopt the real-mode SP */ | |
234 | ||
235 | /* save fn */ | |
236 | copy %arg2, %r31 | |
237 | ||
1da177e4 LT |
238 | /* load up the arg registers from the saved arg area */ |
239 | /* 32-bit calling convention passes first 4 args in registers */ | |
240 | ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */ | |
241 | ldd 2*REG_SZ(%arg1), %arg2 | |
242 | ldd 3*REG_SZ(%arg1), %arg3 | |
243 | ldd 4*REG_SZ(%arg1), %r22 | |
244 | ldd 5*REG_SZ(%arg1), %r21 | |
245 | ldd 6*REG_SZ(%arg1), %r20 | |
246 | ldd 7*REG_SZ(%arg1), %r19 | |
247 | ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */ | |
248 | ||
6e3220ba | 249 | /* set up real-mode stack and real-mode ap */ |
1da177e4 | 250 | tophys_r1 %sp |
6e3220ba | 251 | ldo -16(%sp), %r29 /* Reference param save area */ |
1da177e4 LT |
252 | |
253 | b,l rfi_virt2real,%r2 | |
254 | nop | |
255 | ||
256 | b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ | |
257 | nop | |
258 | ||
259 | load32 PA(r64_ret), %r2 | |
260 | bv 0(%r31) | |
261 | nop | |
262 | r64_ret: | |
263 | /* restore CRs before going virtual in case we page fault */ | |
264 | b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ | |
265 | nop | |
266 | ||
267 | b,l rfi_real2virt,%r2 | |
268 | nop | |
269 | ||
270 | tovirt_r1 %sp | |
271 | ldd -8(%sp), %sp /* restore SP */ | |
272 | ldd -0x10(%sp), %rp /* restore RP */ | |
273 | bv 0(%rp) | |
274 | nop | |
f39cce65 | 275 | ENDPROC_CFI(real64_call_asm) |
1da177e4 LT |
276 | |
277 | #endif | |
278 | ||
dfcf753b | 279 | .text |
1da177e4 LT |
280 | /* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html |
281 | ** GCC 3.3 and later has a new function in libgcc.a for | |
282 | ** comparing function pointers. | |
283 | */ | |
f39cce65 | 284 | ENTRY_CFI(__canonicalize_funcptr_for_compare) |
413059f2 | 285 | #ifdef CONFIG_64BIT |
1da177e4 LT |
286 | bve (%r2) |
287 | #else | |
288 | bv %r0(%r2) | |
289 | #endif | |
290 | copy %r26,%r28 | |
f39cce65 | 291 | ENDPROC_CFI(__canonicalize_funcptr_for_compare) |
8e9e9844 | 292 |