Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * bioscalls.c - the lowlevel layer of the PnPBIOS driver | |
1da177e4 LT |
3 | */ |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/linkage.h> | |
9 | #include <linux/kernel.h> | |
1da177e4 LT |
10 | #include <linux/device.h> |
11 | #include <linux/pnp.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/kmod.h> |
15 | #include <linux/completion.h> | |
16 | #include <linux/spinlock.h> | |
17 | ||
18 | #include <asm/page.h> | |
19 | #include <asm/desc.h> | |
1da177e4 LT |
20 | #include <asm/byteorder.h> |
21 | ||
22 | #include "pnpbios.h" | |
23 | ||
3f557d25 | 24 | __visible struct { |
9dd78466 BH |
25 | u16 offset; |
26 | u16 segment; | |
1da177e4 LT |
27 | } pnp_bios_callpoint; |
28 | ||
1da177e4 LT |
29 | /* |
30 | * These are some opcodes for a "static asmlinkage" | |
31 | * As this code is *not* executed inside the linux kernel segment, but in a | |
32 | * alias at offset 0, we need a far return that can not be compiled by | |
33 | * default (please, prove me wrong! this is *really* ugly!) | |
34 | * This is the only way to get the bios to return into the kernel code, | |
35 | * because the bios code runs in 16 bit protected mode and therefore can only | |
36 | * return to the caller if the call is within the first 64kB, and the linux | |
37 | * kernel begins at offset 3GB... | |
38 | */ | |
39 | ||
40 | asmlinkage void pnp_bios_callfunc(void); | |
41 | ||
9dd78466 | 42 | __asm__(".text \n" |
1da177e4 | 43 | __ALIGN_STR "\n" |
3f557d25 | 44 | ".globl pnp_bios_callfunc\n" |
1da177e4 LT |
45 | "pnp_bios_callfunc:\n" |
46 | " pushl %edx \n" | |
47 | " pushl %ecx \n" | |
48 | " pushl %ebx \n" | |
49 | " pushl %eax \n" | |
50 | " lcallw *pnp_bios_callpoint\n" | |
51 | " addl $16, %esp \n" | |
07d4e9af BH |
52 | " lret \n" |
53 | ".previous \n"); | |
1da177e4 | 54 | |
1da177e4 LT |
55 | #define Q2_SET_SEL(cpu, selname, address, size) \ |
56 | do { \ | |
57594742 AM |
57 | struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \ |
58 | set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \ | |
59 | set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \ | |
1da177e4 LT |
60 | } while(0) |
61 | ||
c7425314 AM |
62 | static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, |
63 | (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); | |
1da177e4 LT |
64 | |
65 | /* | |
66 | * At some point we want to use this stack frame pointer to unwind | |
67 | * after PnP BIOS oopses. | |
68 | */ | |
69 | ||
3f557d25 AK |
70 | __visible u32 pnp_bios_fault_esp; |
71 | __visible u32 pnp_bios_fault_eip; | |
72 | __visible u32 pnp_bios_is_utter_crap = 0; | |
1da177e4 LT |
73 | |
74 | static spinlock_t pnp_bios_lock; | |
75 | ||
1da177e4 LT |
76 | /* |
77 | * Support Functions | |
78 | */ | |
79 | ||
80 | static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, | |
81 | u16 arg4, u16 arg5, u16 arg6, u16 arg7, | |
82 | void *ts1_base, u32 ts1_size, | |
83 | void *ts2_base, u32 ts2_size) | |
84 | { | |
85 | unsigned long flags; | |
86 | u16 status; | |
87 | struct desc_struct save_desc_40; | |
88 | int cpu; | |
89 | ||
90 | /* | |
91 | * PnP BIOSes are generally not terribly re-entrant. | |
92 | * Also, don't rely on them to save everything correctly. | |
93 | */ | |
9dd78466 | 94 | if (pnp_bios_is_utter_crap) |
1da177e4 LT |
95 | return PNP_FUNCTION_NOT_SUPPORTED; |
96 | ||
97 | cpu = get_cpu(); | |
7c4cb60e ZA |
98 | save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8]; |
99 | get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc; | |
1da177e4 LT |
100 | |
101 | /* On some boxes IRQ's during PnP BIOS calls are deadly. */ | |
102 | spin_lock_irqsave(&pnp_bios_lock, flags); | |
103 | ||
104 | /* The lock prevents us bouncing CPU here */ | |
105 | if (ts1_size) | |
106 | Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size); | |
107 | if (ts2_size) | |
108 | Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size); | |
109 | ||
9dd78466 BH |
110 | __asm__ __volatile__("pushl %%ebp\n\t" |
111 | "pushl %%edi\n\t" | |
112 | "pushl %%esi\n\t" | |
113 | "pushl %%ds\n\t" | |
114 | "pushl %%es\n\t" | |
115 | "pushl %%fs\n\t" | |
116 | "pushl %%gs\n\t" | |
117 | "pushfl\n\t" | |
118 | "movl %%esp, pnp_bios_fault_esp\n\t" | |
119 | "movl $1f, pnp_bios_fault_eip\n\t" | |
120 | "lcall %5,%6\n\t" | |
121 | "1:popfl\n\t" | |
122 | "popl %%gs\n\t" | |
123 | "popl %%fs\n\t" | |
124 | "popl %%es\n\t" | |
125 | "popl %%ds\n\t" | |
126 | "popl %%esi\n\t" | |
07d4e9af BH |
127 | "popl %%edi\n\t" |
128 | "popl %%ebp\n\t":"=a"(status) | |
9dd78466 BH |
129 | :"0"((func) | (((u32) arg1) << 16)), |
130 | "b"((arg2) | (((u32) arg3) << 16)), | |
131 | "c"((arg4) | (((u32) arg5) << 16)), | |
132 | "d"((arg6) | (((u32) arg7) << 16)), | |
133 | "i"(PNP_CS32), "i"(0) | |
134 | :"memory"); | |
1da177e4 LT |
135 | spin_unlock_irqrestore(&pnp_bios_lock, flags); |
136 | ||
7c4cb60e | 137 | get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40; |
1da177e4 LT |
138 | put_cpu(); |
139 | ||
140 | /* If we get here and this is set then the PnP BIOS faulted on us. */ | |
9dd78466 BH |
141 | if (pnp_bios_is_utter_crap) { |
142 | printk(KERN_ERR | |
143 | "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n"); | |
144 | printk(KERN_ERR | |
145 | "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n"); | |
146 | printk(KERN_ERR | |
147 | "PnPBIOS: Check with your vendor for an updated BIOS\n"); | |
1da177e4 LT |
148 | } |
149 | ||
150 | return status; | |
151 | } | |
152 | ||
9dd78466 | 153 | void pnpbios_print_status(const char *module, u16 status) |
1da177e4 | 154 | { |
9dd78466 | 155 | switch (status) { |
1da177e4 LT |
156 | case PNP_SUCCESS: |
157 | printk(KERN_ERR "PnPBIOS: %s: function successful\n", module); | |
158 | break; | |
159 | case PNP_NOT_SET_STATICALLY: | |
9dd78466 BH |
160 | printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", |
161 | module); | |
1da177e4 LT |
162 | break; |
163 | case PNP_UNKNOWN_FUNCTION: | |
9dd78466 BH |
164 | printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", |
165 | module); | |
1da177e4 LT |
166 | break; |
167 | case PNP_FUNCTION_NOT_SUPPORTED: | |
9dd78466 BH |
168 | printk(KERN_ERR |
169 | "PnPBIOS: %s: function not supported on this system\n", | |
170 | module); | |
1da177e4 LT |
171 | break; |
172 | case PNP_INVALID_HANDLE: | |
173 | printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module); | |
174 | break; | |
175 | case PNP_BAD_PARAMETER: | |
9dd78466 BH |
176 | printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", |
177 | module); | |
1da177e4 LT |
178 | break; |
179 | case PNP_SET_FAILED: | |
9dd78466 BH |
180 | printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", |
181 | module); | |
1da177e4 LT |
182 | break; |
183 | case PNP_EVENTS_NOT_PENDING: | |
184 | printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module); | |
185 | break; | |
186 | case PNP_SYSTEM_NOT_DOCKED: | |
9dd78466 BH |
187 | printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", |
188 | module); | |
1da177e4 LT |
189 | break; |
190 | case PNP_NO_ISA_PNP_CARDS: | |
9dd78466 BH |
191 | printk(KERN_ERR |
192 | "PnPBIOS: %s: no isapnp cards are installed on this system\n", | |
193 | module); | |
1da177e4 LT |
194 | break; |
195 | case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES: | |
9dd78466 BH |
196 | printk(KERN_ERR |
197 | "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", | |
198 | module); | |
1da177e4 LT |
199 | break; |
200 | case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY: | |
9dd78466 BH |
201 | printk(KERN_ERR |
202 | "PnPBIOS: %s: unable to undock, the system does not have a battery\n", | |
203 | module); | |
1da177e4 LT |
204 | break; |
205 | case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT: | |
9dd78466 BH |
206 | printk(KERN_ERR |
207 | "PnPBIOS: %s: could not dock due to resource conflicts\n", | |
208 | module); | |
1da177e4 LT |
209 | break; |
210 | case PNP_BUFFER_TOO_SMALL: | |
9dd78466 BH |
211 | printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", |
212 | module); | |
1da177e4 LT |
213 | break; |
214 | case PNP_USE_ESCD_SUPPORT: | |
215 | printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module); | |
216 | break; | |
217 | case PNP_MESSAGE_NOT_SUPPORTED: | |
9dd78466 BH |
218 | printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", |
219 | module); | |
1da177e4 LT |
220 | break; |
221 | case PNP_HARDWARE_ERROR: | |
25985edc | 222 | printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occurred\n", |
9dd78466 | 223 | module); |
1da177e4 LT |
224 | break; |
225 | default: | |
9dd78466 BH |
226 | printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, |
227 | status); | |
1da177e4 LT |
228 | break; |
229 | } | |
230 | } | |
231 | ||
1da177e4 LT |
232 | /* |
233 | * PnP BIOS Low Level Calls | |
234 | */ | |
235 | ||
236 | #define PNP_GET_NUM_SYS_DEV_NODES 0x00 | |
237 | #define PNP_GET_SYS_DEV_NODE 0x01 | |
238 | #define PNP_SET_SYS_DEV_NODE 0x02 | |
239 | #define PNP_GET_EVENT 0x03 | |
240 | #define PNP_SEND_MESSAGE 0x04 | |
241 | #define PNP_GET_DOCKING_STATION_INFORMATION 0x05 | |
242 | #define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09 | |
243 | #define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a | |
244 | #define PNP_GET_APM_ID_TABLE 0x0b | |
245 | #define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40 | |
246 | #define PNP_GET_ESCD_INFO 0x41 | |
247 | #define PNP_READ_ESCD 0x42 | |
248 | #define PNP_WRITE_ESCD 0x43 | |
249 | ||
250 | /* | |
251 | * Call PnP BIOS with function 0x00, "get number of system device nodes" | |
252 | */ | |
253 | static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data) | |
254 | { | |
255 | u16 status; | |
07d4e9af | 256 | |
1da177e4 LT |
257 | if (!pnp_bios_present()) |
258 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
259 | status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, |
260 | PNP_TS1, PNP_DS, 0, 0, data, | |
261 | sizeof(struct pnp_dev_node_info), NULL, 0); | |
1da177e4 LT |
262 | data->no_nodes &= 0xff; |
263 | return status; | |
264 | } | |
265 | ||
266 | int pnp_bios_dev_node_info(struct pnp_dev_node_info *data) | |
267 | { | |
9dd78466 | 268 | int status = __pnp_bios_dev_node_info(data); |
07d4e9af | 269 | |
9dd78466 BH |
270 | if (status) |
271 | pnpbios_print_status("dev_node_info", status); | |
1da177e4 LT |
272 | return status; |
273 | } | |
274 | ||
275 | /* | |
276 | * Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible | |
277 | * death if they are asked to access the "current" configuration. | |
278 | * Therefore, if it's a matter of indifference, it's better to call | |
279 | * get_dev_node() and set_dev_node() with boot=1 rather than with boot=0. | |
280 | */ | |
281 | ||
282 | /* | |
283 | * Call PnP BIOS with function 0x01, "get system device node" | |
284 | * Input: *nodenum = desired node, | |
285 | * boot = whether to get nonvolatile boot (!=0) | |
286 | * or volatile current (0) config | |
287 | * Output: *nodenum=next node or 0xff if no more nodes | |
288 | */ | |
07d4e9af | 289 | static int __pnp_bios_get_dev_node(u8 *nodenum, char boot, |
9dd78466 | 290 | struct pnp_bios_node *data) |
1da177e4 LT |
291 | { |
292 | u16 status; | |
5fe9fe3c | 293 | u16 tmp_nodenum; |
07d4e9af | 294 | |
1da177e4 LT |
295 | if (!pnp_bios_present()) |
296 | return PNP_FUNCTION_NOT_SUPPORTED; | |
9dd78466 | 297 | if (!boot && pnpbios_dont_use_current_config) |
1da177e4 | 298 | return PNP_FUNCTION_NOT_SUPPORTED; |
5fe9fe3c | 299 | tmp_nodenum = *nodenum; |
07d4e9af BH |
300 | status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, |
301 | boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum, | |
302 | sizeof(tmp_nodenum), data, 65536); | |
5fe9fe3c | 303 | *nodenum = tmp_nodenum; |
1da177e4 LT |
304 | return status; |
305 | } | |
306 | ||
07d4e9af | 307 | int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data) |
1da177e4 LT |
308 | { |
309 | int status; | |
07d4e9af | 310 | |
9dd78466 BH |
311 | status = __pnp_bios_get_dev_node(nodenum, boot, data); |
312 | if (status) | |
313 | pnpbios_print_status("get_dev_node", status); | |
1da177e4 LT |
314 | return status; |
315 | } | |
316 | ||
1da177e4 LT |
317 | /* |
318 | * Call PnP BIOS with function 0x02, "set system device node" | |
319 | * Input: *nodenum = desired node, | |
320 | * boot = whether to set nonvolatile boot (!=0) | |
321 | * or volatile current (0) config | |
322 | */ | |
9dd78466 BH |
323 | static int __pnp_bios_set_dev_node(u8 nodenum, char boot, |
324 | struct pnp_bios_node *data) | |
1da177e4 LT |
325 | { |
326 | u16 status; | |
07d4e9af | 327 | |
1da177e4 LT |
328 | if (!pnp_bios_present()) |
329 | return PNP_FUNCTION_NOT_SUPPORTED; | |
9dd78466 | 330 | if (!boot && pnpbios_dont_use_current_config) |
1da177e4 | 331 | return PNP_FUNCTION_NOT_SUPPORTED; |
07d4e9af BH |
332 | status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, |
333 | boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL, | |
334 | 0); | |
1da177e4 LT |
335 | return status; |
336 | } | |
337 | ||
338 | int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data) | |
339 | { | |
340 | int status; | |
07d4e9af | 341 | |
9dd78466 BH |
342 | status = __pnp_bios_set_dev_node(nodenum, boot, data); |
343 | if (status) { | |
344 | pnpbios_print_status("set_dev_node", status); | |
1da177e4 LT |
345 | return status; |
346 | } | |
9dd78466 BH |
347 | if (!boot) { /* Update devlist */ |
348 | status = pnp_bios_get_dev_node(&nodenum, boot, data); | |
349 | if (status) | |
1da177e4 LT |
350 | return status; |
351 | } | |
352 | return status; | |
353 | } | |
354 | ||
1da177e4 LT |
355 | /* |
356 | * Call PnP BIOS with function 0x05, "get docking station information" | |
357 | */ | |
358 | int pnp_bios_dock_station_info(struct pnp_docking_station_info *data) | |
359 | { | |
360 | u16 status; | |
1da177e4 | 361 | |
1da177e4 LT |
362 | if (!pnp_bios_present()) |
363 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
364 | status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, |
365 | PNP_DS, 0, 0, 0, 0, data, | |
366 | sizeof(struct pnp_docking_station_info), NULL, | |
367 | 0); | |
1da177e4 LT |
368 | return status; |
369 | } | |
1da177e4 LT |
370 | |
371 | /* | |
372 | * Call PnP BIOS with function 0x0a, "get statically allocated resource | |
373 | * information" | |
374 | */ | |
375 | static int __pnp_bios_get_stat_res(char *info) | |
376 | { | |
377 | u16 status; | |
07d4e9af | 378 | |
1da177e4 LT |
379 | if (!pnp_bios_present()) |
380 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
381 | status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, |
382 | PNP_DS, 0, 0, 0, 0, info, 65536, NULL, 0); | |
1da177e4 LT |
383 | return status; |
384 | } | |
385 | ||
386 | int pnp_bios_get_stat_res(char *info) | |
387 | { | |
388 | int status; | |
07d4e9af | 389 | |
9dd78466 BH |
390 | status = __pnp_bios_get_stat_res(info); |
391 | if (status) | |
392 | pnpbios_print_status("get_stat_res", status); | |
1da177e4 LT |
393 | return status; |
394 | } | |
395 | ||
1da177e4 LT |
396 | /* |
397 | * Call PnP BIOS with function 0x40, "get isa pnp configuration structure" | |
398 | */ | |
399 | static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data) | |
400 | { | |
401 | u16 status; | |
07d4e9af | 402 | |
1da177e4 LT |
403 | if (!pnp_bios_present()) |
404 | return PNP_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
405 | status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, |
406 | 0, 0, 0, 0, data, | |
407 | sizeof(struct pnp_isa_config_struc), NULL, 0); | |
1da177e4 LT |
408 | return status; |
409 | } | |
410 | ||
411 | int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data) | |
412 | { | |
413 | int status; | |
07d4e9af | 414 | |
9dd78466 BH |
415 | status = __pnp_bios_isapnp_config(data); |
416 | if (status) | |
417 | pnpbios_print_status("isapnp_config", status); | |
1da177e4 LT |
418 | return status; |
419 | } | |
420 | ||
421 | /* | |
422 | * Call PnP BIOS with function 0x41, "get ESCD info" | |
423 | */ | |
424 | static int __pnp_bios_escd_info(struct escd_info_struc *data) | |
425 | { | |
426 | u16 status; | |
07d4e9af | 427 | |
1da177e4 LT |
428 | if (!pnp_bios_present()) |
429 | return ESCD_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
430 | status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, |
431 | PNP_TS1, PNP_DS, data, | |
432 | sizeof(struct escd_info_struc), NULL, 0); | |
1da177e4 LT |
433 | return status; |
434 | } | |
435 | ||
436 | int pnp_bios_escd_info(struct escd_info_struc *data) | |
437 | { | |
438 | int status; | |
07d4e9af | 439 | |
9dd78466 BH |
440 | status = __pnp_bios_escd_info(data); |
441 | if (status) | |
442 | pnpbios_print_status("escd_info", status); | |
1da177e4 LT |
443 | return status; |
444 | } | |
445 | ||
446 | /* | |
447 | * Call PnP BIOS function 0x42, "read ESCD" | |
448 | * nvram_base is determined by calling escd_info | |
449 | */ | |
450 | static int __pnp_bios_read_escd(char *data, u32 nvram_base) | |
451 | { | |
452 | u16 status; | |
07d4e9af | 453 | |
1da177e4 LT |
454 | if (!pnp_bios_present()) |
455 | return ESCD_FUNCTION_NOT_SUPPORTED; | |
07d4e9af BH |
456 | status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, |
457 | 0, data, 65536, __va(nvram_base), 65536); | |
1da177e4 LT |
458 | return status; |
459 | } | |
460 | ||
461 | int pnp_bios_read_escd(char *data, u32 nvram_base) | |
462 | { | |
463 | int status; | |
07d4e9af | 464 | |
9dd78466 BH |
465 | status = __pnp_bios_read_escd(data, nvram_base); |
466 | if (status) | |
467 | pnpbios_print_status("read_escd", status); | |
1da177e4 LT |
468 | return status; |
469 | } | |
470 | ||
1da177e4 LT |
471 | void pnpbios_calls_init(union pnp_bios_install_struct *header) |
472 | { | |
473 | int i; | |
07d4e9af | 474 | |
1da177e4 LT |
475 | spin_lock_init(&pnp_bios_lock); |
476 | pnp_bios_callpoint.offset = header->fields.pm16offset; | |
477 | pnp_bios_callpoint.segment = PNP_CS16; | |
478 | ||
6aaa8ce5 | 479 | for_each_possible_cpu(i) { |
9dd78466 BH |
480 | struct desc_struct *gdt = get_cpu_gdt_table(i); |
481 | if (!gdt) | |
482 | continue; | |
57594742 AM |
483 | set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32], |
484 | (unsigned long)&pnp_bios_callfunc); | |
485 | set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16], | |
486 | (unsigned long)__va(header->fields.pm16cseg)); | |
487 | set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS], | |
488 | (unsigned long)__va(header->fields.pm16dseg)); | |
9dd78466 | 489 | } |
1da177e4 | 490 | } |