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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * bioscalls.c - the lowlevel layer of the PnPBIOS driver | |
1da177e4 LT |
4 | */ |
5 | ||
6 | #include <linux/types.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/linkage.h> | |
10 | #include <linux/kernel.h> | |
1da177e4 LT |
11 | #include <linux/device.h> |
12 | #include <linux/pnp.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/smp.h> | |
1da177e4 LT |
15 | #include <linux/kmod.h> |
16 | #include <linux/completion.h> | |
17 | #include <linux/spinlock.h> | |
18 | ||
19 | #include <asm/page.h> | |
20 | #include <asm/desc.h> | |
1da177e4 LT |
21 | #include <asm/byteorder.h> |
22 | ||
23 | #include "pnpbios.h" | |
24 | ||
a99aa42d | 25 | __visible struct { |
9dd78466 BH |
26 | u16 offset; |
27 | u16 segment; | |
1da177e4 LT |
28 | } pnp_bios_callpoint; |
29 | ||
1da177e4 LT |
30 | /* |
31 | * These are some opcodes for a "static asmlinkage" | |
32 | * As this code is *not* executed inside the linux kernel segment, but in a | |
33 | * alias at offset 0, we need a far return that can not be compiled by | |
34 | * default (please, prove me wrong! this is *really* ugly!) | |
35 | * This is the only way to get the bios to return into the kernel code, | |
36 | * because the bios code runs in 16 bit protected mode and therefore can only | |
37 | * return to the caller if the call is within the first 64kB, and the linux | |
38 | * kernel begins at offset 3GB... | |
39 | */ | |
40 | ||
722a9f92 | 41 | asmlinkage __visible void pnp_bios_callfunc(void); |
1da177e4 | 42 | |
9dd78466 | 43 | __asm__(".text \n" |
1da177e4 | 44 | __ALIGN_STR "\n" |
a99aa42d | 45 | ".globl pnp_bios_callfunc\n" |
1da177e4 LT |
46 | "pnp_bios_callfunc:\n" |
47 | " pushl %edx \n" | |
48 | " pushl %ecx \n" | |
49 | " pushl %ebx \n" | |
50 | " pushl %eax \n" | |
51 | " lcallw *pnp_bios_callpoint\n" | |
52 | " addl $16, %esp \n" | |
07d4e9af BH |
53 | " lret \n" |
54 | ".previous \n"); | |
1da177e4 | 55 | |
1da177e4 LT |
56 | #define Q2_SET_SEL(cpu, selname, address, size) \ |
57 | do { \ | |
69218e47 | 58 | struct desc_struct *gdt = get_cpu_gdt_rw((cpu)); \ |
57594742 AM |
59 | set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \ |
60 | set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \ | |
1da177e4 LT |
61 | } while(0) |
62 | ||
c7425314 AM |
63 | static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, |
64 | (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); | |
1da177e4 LT |
65 | |
66 | /* | |
67 | * At some point we want to use this stack frame pointer to unwind | |
68 | * after PnP BIOS oopses. | |
69 | */ | |
70 | ||
a99aa42d AK |
71 | __visible u32 pnp_bios_fault_esp; |
72 | __visible u32 pnp_bios_fault_eip; | |
73 | __visible u32 pnp_bios_is_utter_crap = 0; | |
1da177e4 LT |
74 | |
75 | static spinlock_t pnp_bios_lock; | |
76 | ||
1da177e4 LT |
77 | /* |
78 | * Support Functions | |
79 | */ | |
80 | ||
81 | static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, | |
82 | u16 arg4, u16 arg5, u16 arg6, u16 arg7, | |
83 | void *ts1_base, u32 ts1_size, | |
84 | void *ts2_base, u32 ts2_size) | |
85 | { | |
86 | unsigned long flags; | |
87 | u16 status; | |
88 | struct desc_struct save_desc_40; | |
89 | int cpu; | |
90 | ||
91 | /* | |
92 | * PnP BIOSes are generally not terribly re-entrant. | |
93 | * Also, don't rely on them to save everything correctly. | |
94 | */ | |
9dd78466 | 95 | if (pnp_bios_is_utter_crap) |
1da177e4 LT |
96 | return PNP_FUNCTION_NOT_SUPPORTED; |
97 | ||
98 | cpu = get_cpu(); | |
69218e47 TG |
99 | save_desc_40 = get_cpu_gdt_rw(cpu)[0x40 / 8]; |
100 | get_cpu_gdt_rw(cpu)[0x40 / 8] = bad_bios_desc; | |
1da177e4 LT |
101 | |
102 | /* On some boxes IRQ's during PnP BIOS calls are deadly. */ | |
103 | spin_lock_irqsave(&pnp_bios_lock, flags); | |
104 | ||
105 | /* The lock prevents us bouncing CPU here */ | |
106 | if (ts1_size) | |
107 | Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size); | |
108 | if (ts2_size) | |
109 | Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size); | |
110 | ||
9dd78466 BH |
111 | __asm__ __volatile__("pushl %%ebp\n\t" |
112 | "pushl %%edi\n\t" | |
113 | "pushl %%esi\n\t" | |
114 | "pushl %%ds\n\t" | |
115 | "pushl %%es\n\t" | |
116 | "pushl %%fs\n\t" | |
117 | "pushl %%gs\n\t" | |
118 | "pushfl\n\t" | |
119 | "movl %%esp, pnp_bios_fault_esp\n\t" | |
120 | "movl $1f, pnp_bios_fault_eip\n\t" | |
121 | "lcall %5,%6\n\t" | |
122 | "1:popfl\n\t" | |
123 | "popl %%gs\n\t" | |
124 | "popl %%fs\n\t" | |
125 | "popl %%es\n\t" | |
126 | "popl %%ds\n\t" | |
127 | "popl %%esi\n\t" | |
07d4e9af BH |
128 | "popl %%edi\n\t" |
129 | "popl %%ebp\n\t":"=a"(status) | |
9dd78466 BH |
130 | :"0"((func) | (((u32) arg1) << 16)), |
131 | "b"((arg2) | (((u32) arg3) << 16)), | |
132 | "c"((arg4) | (((u32) arg5) << 16)), | |
133 | "d"((arg6) | (((u32) arg7) << 16)), | |
134 | "i"(PNP_CS32), "i"(0) | |
135 | :"memory"); | |
1da177e4 LT |
136 | spin_unlock_irqrestore(&pnp_bios_lock, flags); |
137 | ||
69218e47 | 138 | get_cpu_gdt_rw(cpu)[0x40 / 8] = save_desc_40; |
1da177e4 LT |
139 | put_cpu(); |
140 | ||
141 | /* If we get here and this is set then the PnP BIOS faulted on us. */ | |
9dd78466 BH |
142 | if (pnp_bios_is_utter_crap) { |
143 | printk(KERN_ERR | |
144 | "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n"); | |
145 | printk(KERN_ERR | |
146 | "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n"); | |
147 | printk(KERN_ERR | |
148 | "PnPBIOS: Check with your vendor for an updated BIOS\n"); | |
1da177e4 LT |
149 | } |
150 | ||
151 | return status; | |
152 | } | |
153 | ||
9dd78466 | 154 | void pnpbios_print_status(const char *module, u16 status) |
1da177e4 | 155 | { |
9dd78466 | 156 | switch (status) { |
1da177e4 LT |
157 | case PNP_SUCCESS: |
158 | printk(KERN_ERR "PnPBIOS: %s: function successful\n", module); | |
159 | break; | |
160 | case PNP_NOT_SET_STATICALLY: | |
9dd78466 BH |
161 | printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", |
162 | module); | |
1da177e4 LT |
163 | break; |
164 | case PNP_UNKNOWN_FUNCTION: | |
9dd78466 BH |
165 | printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", |
166 | module); | |
1da177e4 LT |
167 | break; |
168 | case PNP_FUNCTION_NOT_SUPPORTED: | |
9dd78466 BH |
169 | printk(KERN_ERR |
170 | "PnPBIOS: %s: function not supported on this system\n", | |
171 | module); | |
1da177e4 LT |
172 | break; |
173 | case PNP_INVALID_HANDLE: | |
174 | printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module); | |
175 | break; | |
176 | case PNP_BAD_PARAMETER: | |
9dd78466 BH |
177 | printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", |
178 | module); | |
1da177e4 LT |
179 | break; |
180 | case PNP_SET_FAILED: | |
9dd78466 BH |
181 | printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", |
182 | module); | |
1da177e4 LT |
183 | break; |
184 | case PNP_EVENTS_NOT_PENDING: | |
185 | printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module); | |
186 | break; | |
187 | case PNP_SYSTEM_NOT_DOCKED: | |
9dd78466 BH |
188 | printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", |
189 | module); | |
1da177e4 LT |
190 | break; |
191 | case PNP_NO_ISA_PNP_CARDS: | |
9dd78466 BH |
192 | printk(KERN_ERR |
193 | "PnPBIOS: %s: no isapnp cards are installed on this system\n", | |
194 | module); | |
1da177e4 LT |
195 | break; |
196 | case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES: | |
9dd78466 BH |
197 | printk(KERN_ERR |
198 | "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", | |
199 | module); | |
1da177e4 LT |
200 | break; |
201 | case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY: | |
9dd78466 BH |
202 | printk(KERN_ERR |
203 | "PnPBIOS: %s: unable to undock, the system does not have a battery\n", | |
204 | module); | |
1da177e4 LT |
205 | break; |
206 | case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT: | |
9dd78466 BH |
207 | printk(KERN_ERR |
208 | "PnPBIOS: %s: could not dock due to resource conflicts\n", | |
209 | module); | |
1da177e4 LT |
210 | break; |
211 | case PNP_BUFFER_TOO_SMALL: | |
9dd78466 BH |
212 | printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", |
213 | module); | |
1da177e4 LT |
214 | break; |
215 | case PNP_USE_ESCD_SUPPORT: | |
216 | printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module); | |
217 | break; | |
218 | case PNP_MESSAGE_NOT_SUPPORTED: | |
9dd78466 BH |
219 | printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", |
220 | module); | |
1da177e4 LT |
221 | break; |
222 | case PNP_HARDWARE_ERROR: | |
25985edc | 223 | printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occurred\n", |
9dd78466 | 224 | module); |
1da177e4 LT |
225 | break; |
226 | default: | |
9dd78466 BH |
227 | printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, |
228 | status); | |
1da177e4 LT |
229 | break; |
230 | } | |
231 | } | |
232 | ||
1da177e4 LT |
233 | /* |
234 | * PnP BIOS Low Level Calls | |
235 | */ | |
236 | ||
237 | #define PNP_GET_NUM_SYS_DEV_NODES 0x00 | |
238 | #define PNP_GET_SYS_DEV_NODE 0x01 | |
239 | #define PNP_SET_SYS_DEV_NODE 0x02 | |
240 | #define PNP_GET_EVENT 0x03 | |
241 | #define PNP_SEND_MESSAGE 0x04 | |
242 | #define PNP_GET_DOCKING_STATION_INFORMATION 0x05 | |
243 | #define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09 | |
244 | #define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a | |
245 | #define PNP_GET_APM_ID_TABLE 0x0b | |
246 | #define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40 | |
247 | #define PNP_GET_ESCD_INFO 0x41 | |
248 | #define PNP_READ_ESCD 0x42 | |
249 | #define PNP_WRITE_ESCD 0x43 | |
250 | ||
251 | /* | |
252 | * Call PnP BIOS with function 0x00, "get number of system device nodes" | |
253 | */ | |
254 | static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data) | |
255 | { | |
256 | u16 status; | |
07d4e9af | 257 | |
1da177e4 LT |
258 | if (!pnp_bios_present()) |
259 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
260 | status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, |
261 | PNP_TS1, PNP_DS, 0, 0, data, | |
262 | sizeof(struct pnp_dev_node_info), NULL, 0); | |
1da177e4 LT |
263 | data->no_nodes &= 0xff; |
264 | return status; | |
265 | } | |
266 | ||
267 | int pnp_bios_dev_node_info(struct pnp_dev_node_info *data) | |
268 | { | |
9dd78466 | 269 | int status = __pnp_bios_dev_node_info(data); |
07d4e9af | 270 | |
9dd78466 BH |
271 | if (status) |
272 | pnpbios_print_status("dev_node_info", status); | |
1da177e4 LT |
273 | return status; |
274 | } | |
275 | ||
276 | /* | |
277 | * Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible | |
278 | * death if they are asked to access the "current" configuration. | |
279 | * Therefore, if it's a matter of indifference, it's better to call | |
280 | * get_dev_node() and set_dev_node() with boot=1 rather than with boot=0. | |
281 | */ | |
282 | ||
283 | /* | |
284 | * Call PnP BIOS with function 0x01, "get system device node" | |
285 | * Input: *nodenum = desired node, | |
286 | * boot = whether to get nonvolatile boot (!=0) | |
287 | * or volatile current (0) config | |
288 | * Output: *nodenum=next node or 0xff if no more nodes | |
289 | */ | |
07d4e9af | 290 | static int __pnp_bios_get_dev_node(u8 *nodenum, char boot, |
9dd78466 | 291 | struct pnp_bios_node *data) |
1da177e4 LT |
292 | { |
293 | u16 status; | |
5fe9fe3c | 294 | u16 tmp_nodenum; |
07d4e9af | 295 | |
1da177e4 LT |
296 | if (!pnp_bios_present()) |
297 | return PNP_FUNCTION_NOT_SUPPORTED; | |
9dd78466 | 298 | if (!boot && pnpbios_dont_use_current_config) |
1da177e4 | 299 | return PNP_FUNCTION_NOT_SUPPORTED; |
5fe9fe3c | 300 | tmp_nodenum = *nodenum; |
07d4e9af BH |
301 | status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, |
302 | boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum, | |
303 | sizeof(tmp_nodenum), data, 65536); | |
5fe9fe3c | 304 | *nodenum = tmp_nodenum; |
1da177e4 LT |
305 | return status; |
306 | } | |
307 | ||
07d4e9af | 308 | int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data) |
1da177e4 LT |
309 | { |
310 | int status; | |
07d4e9af | 311 | |
9dd78466 BH |
312 | status = __pnp_bios_get_dev_node(nodenum, boot, data); |
313 | if (status) | |
314 | pnpbios_print_status("get_dev_node", status); | |
1da177e4 LT |
315 | return status; |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Call PnP BIOS with function 0x02, "set system device node" | |
320 | * Input: *nodenum = desired node, | |
321 | * boot = whether to set nonvolatile boot (!=0) | |
322 | * or volatile current (0) config | |
323 | */ | |
9dd78466 BH |
324 | static int __pnp_bios_set_dev_node(u8 nodenum, char boot, |
325 | struct pnp_bios_node *data) | |
1da177e4 LT |
326 | { |
327 | u16 status; | |
07d4e9af | 328 | |
1da177e4 LT |
329 | if (!pnp_bios_present()) |
330 | return PNP_FUNCTION_NOT_SUPPORTED; | |
9dd78466 | 331 | if (!boot && pnpbios_dont_use_current_config) |
1da177e4 | 332 | return PNP_FUNCTION_NOT_SUPPORTED; |
07d4e9af BH |
333 | status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, |
334 | boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL, | |
335 | 0); | |
1da177e4 LT |
336 | return status; |
337 | } | |
338 | ||
339 | int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data) | |
340 | { | |
341 | int status; | |
07d4e9af | 342 | |
9dd78466 BH |
343 | status = __pnp_bios_set_dev_node(nodenum, boot, data); |
344 | if (status) { | |
345 | pnpbios_print_status("set_dev_node", status); | |
1da177e4 LT |
346 | return status; |
347 | } | |
9dd78466 BH |
348 | if (!boot) { /* Update devlist */ |
349 | status = pnp_bios_get_dev_node(&nodenum, boot, data); | |
350 | if (status) | |
1da177e4 LT |
351 | return status; |
352 | } | |
353 | return status; | |
354 | } | |
355 | ||
1da177e4 LT |
356 | /* |
357 | * Call PnP BIOS with function 0x05, "get docking station information" | |
358 | */ | |
359 | int pnp_bios_dock_station_info(struct pnp_docking_station_info *data) | |
360 | { | |
361 | u16 status; | |
1da177e4 | 362 | |
1da177e4 LT |
363 | if (!pnp_bios_present()) |
364 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
365 | status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, |
366 | PNP_DS, 0, 0, 0, 0, data, | |
367 | sizeof(struct pnp_docking_station_info), NULL, | |
368 | 0); | |
1da177e4 LT |
369 | return status; |
370 | } | |
1da177e4 LT |
371 | |
372 | /* | |
373 | * Call PnP BIOS with function 0x0a, "get statically allocated resource | |
374 | * information" | |
375 | */ | |
376 | static int __pnp_bios_get_stat_res(char *info) | |
377 | { | |
378 | u16 status; | |
07d4e9af | 379 | |
1da177e4 LT |
380 | if (!pnp_bios_present()) |
381 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
382 | status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, |
383 | PNP_DS, 0, 0, 0, 0, info, 65536, NULL, 0); | |
1da177e4 LT |
384 | return status; |
385 | } | |
386 | ||
387 | int pnp_bios_get_stat_res(char *info) | |
388 | { | |
389 | int status; | |
07d4e9af | 390 | |
9dd78466 BH |
391 | status = __pnp_bios_get_stat_res(info); |
392 | if (status) | |
393 | pnpbios_print_status("get_stat_res", status); | |
1da177e4 LT |
394 | return status; |
395 | } | |
396 | ||
1da177e4 LT |
397 | /* |
398 | * Call PnP BIOS with function 0x40, "get isa pnp configuration structure" | |
399 | */ | |
400 | static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data) | |
401 | { | |
402 | u16 status; | |
07d4e9af | 403 | |
1da177e4 LT |
404 | if (!pnp_bios_present()) |
405 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
406 | status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, |
407 | 0, 0, 0, 0, data, | |
408 | sizeof(struct pnp_isa_config_struc), NULL, 0); | |
1da177e4 LT |
409 | return status; |
410 | } | |
411 | ||
412 | int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data) | |
413 | { | |
414 | int status; | |
07d4e9af | 415 | |
9dd78466 BH |
416 | status = __pnp_bios_isapnp_config(data); |
417 | if (status) | |
418 | pnpbios_print_status("isapnp_config", status); | |
1da177e4 LT |
419 | return status; |
420 | } | |
421 | ||
422 | /* | |
423 | * Call PnP BIOS with function 0x41, "get ESCD info" | |
424 | */ | |
425 | static int __pnp_bios_escd_info(struct escd_info_struc *data) | |
426 | { | |
427 | u16 status; | |
07d4e9af | 428 | |
1da177e4 LT |
429 | if (!pnp_bios_present()) |
430 | return ESCD_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
431 | status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, |
432 | PNP_TS1, PNP_DS, data, | |
433 | sizeof(struct escd_info_struc), NULL, 0); | |
1da177e4 LT |
434 | return status; |
435 | } | |
436 | ||
437 | int pnp_bios_escd_info(struct escd_info_struc *data) | |
438 | { | |
439 | int status; | |
07d4e9af | 440 | |
9dd78466 BH |
441 | status = __pnp_bios_escd_info(data); |
442 | if (status) | |
443 | pnpbios_print_status("escd_info", status); | |
1da177e4 LT |
444 | return status; |
445 | } | |
446 | ||
447 | /* | |
448 | * Call PnP BIOS function 0x42, "read ESCD" | |
449 | * nvram_base is determined by calling escd_info | |
450 | */ | |
451 | static int __pnp_bios_read_escd(char *data, u32 nvram_base) | |
452 | { | |
453 | u16 status; | |
07d4e9af | 454 | |
1da177e4 LT |
455 | if (!pnp_bios_present()) |
456 | return ESCD_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
457 | status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, |
458 | 0, data, 65536, __va(nvram_base), 65536); | |
1da177e4 LT |
459 | return status; |
460 | } | |
461 | ||
462 | int pnp_bios_read_escd(char *data, u32 nvram_base) | |
463 | { | |
464 | int status; | |
07d4e9af | 465 | |
9dd78466 BH |
466 | status = __pnp_bios_read_escd(data, nvram_base); |
467 | if (status) | |
468 | pnpbios_print_status("read_escd", status); | |
1da177e4 LT |
469 | return status; |
470 | } | |
471 | ||
1da177e4 LT |
472 | void pnpbios_calls_init(union pnp_bios_install_struct *header) |
473 | { | |
474 | int i; | |
07d4e9af | 475 | |
1da177e4 LT |
476 | spin_lock_init(&pnp_bios_lock); |
477 | pnp_bios_callpoint.offset = header->fields.pm16offset; | |
478 | pnp_bios_callpoint.segment = PNP_CS16; | |
479 | ||
6aaa8ce5 | 480 | for_each_possible_cpu(i) { |
69218e47 | 481 | struct desc_struct *gdt = get_cpu_gdt_rw(i); |
9dd78466 BH |
482 | if (!gdt) |
483 | continue; | |
57594742 AM |
484 | set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32], |
485 | (unsigned long)&pnp_bios_callfunc); | |
486 | set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16], | |
487 | (unsigned long)__va(header->fields.pm16cseg)); | |
488 | set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS], | |
489 | (unsigned long)__va(header->fields.pm16dseg)); | |
9dd78466 | 490 | } |
1da177e4 | 491 | } |