2 * bioscalls.c - the lowlevel layer of the PnPBIOS driver
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>
11 #include <linux/pnpbios.h>
12 #include <linux/device.h>
13 #include <linux/pnp.h>
15 #include <linux/smp.h>
16 #include <linux/slab.h>
17 #include <linux/kmod.h>
18 #include <linux/completion.h>
19 #include <linux/spinlock.h>
23 #include <asm/system.h>
24 #include <asm/byteorder.h>
34 /* The PnP BIOS entries in the GDT */
35 #define PNP_GDT (GDT_ENTRY_PNPBIOS_BASE * 8)
37 #define PNP_CS32 (PNP_GDT+0x00) /* segment for calling fn */
38 #define PNP_CS16 (PNP_GDT+0x08) /* code segment for BIOS */
39 #define PNP_DS (PNP_GDT+0x10) /* data segment for BIOS */
40 #define PNP_TS1 (PNP_GDT+0x18) /* transfer data segment */
41 #define PNP_TS2 (PNP_GDT+0x20) /* another data segment */
44 * These are some opcodes for a "static asmlinkage"
45 * As this code is *not* executed inside the linux kernel segment, but in a
46 * alias at offset 0, we need a far return that can not be compiled by
47 * default (please, prove me wrong! this is *really* ugly!)
48 * This is the only way to get the bios to return into the kernel code,
49 * because the bios code runs in 16 bit protected mode and therefore can only
50 * return to the caller if the call is within the first 64kB, and the linux
51 * kernel begins at offset 3GB...
54 asmlinkage void pnp_bios_callfunc(void);
59 "pnp_bios_callfunc:\n"
64 " lcallw *pnp_bios_callpoint\n"
70 #define Q_SET_SEL(cpu, selname, address, size) \
72 set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], __va((u32)(address))); \
73 set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \
76 #define Q2_SET_SEL(cpu, selname, address, size) \
78 set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], (u32)(address)); \
79 set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \
82 static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
85 * At some point we want to use this stack frame pointer to unwind
86 * after PnP BIOS oopses.
89 u32 pnp_bios_fault_esp;
90 u32 pnp_bios_fault_eip;
91 u32 pnp_bios_is_utter_crap = 0;
93 static spinlock_t pnp_bios_lock;
100 static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
101 u16 arg4, u16 arg5, u16 arg6, u16 arg7,
102 void *ts1_base, u32 ts1_size,
103 void *ts2_base, u32 ts2_size)
107 struct desc_struct save_desc_40;
111 * PnP BIOSes are generally not terribly re-entrant.
112 * Also, don't rely on them to save everything correctly.
114 if(pnp_bios_is_utter_crap)
115 return PNP_FUNCTION_NOT_SUPPORTED;
118 save_desc_40 = per_cpu(cpu_gdt_table,cpu)[0x40 / 8];
119 per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = bad_bios_desc;
121 /* On some boxes IRQ's during PnP BIOS calls are deadly. */
122 spin_lock_irqsave(&pnp_bios_lock, flags);
124 /* The lock prevents us bouncing CPU here */
126 Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
128 Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
130 __asm__ __volatile__(
139 "movl %%esp, pnp_bios_fault_esp\n\t"
140 "movl $1f, pnp_bios_fault_eip\n\t"
151 : "0" ((func) | (((u32)arg1) << 16)),
152 "b" ((arg2) | (((u32)arg3) << 16)),
153 "c" ((arg4) | (((u32)arg5) << 16)),
154 "d" ((arg6) | (((u32)arg7) << 16)),
159 spin_unlock_irqrestore(&pnp_bios_lock, flags);
161 per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = save_desc_40;
164 /* If we get here and this is set then the PnP BIOS faulted on us. */
165 if(pnp_bios_is_utter_crap)
167 printk(KERN_ERR "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
168 printk(KERN_ERR "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
169 printk(KERN_ERR "PnPBIOS: Check with your vendor for an updated BIOS\n");
175 void pnpbios_print_status(const char * module, u16 status)
179 printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
181 case PNP_NOT_SET_STATICALLY:
182 printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", module);
184 case PNP_UNKNOWN_FUNCTION:
185 printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", module);
187 case PNP_FUNCTION_NOT_SUPPORTED:
188 printk(KERN_ERR "PnPBIOS: %s: function not supported on this system\n", module);
190 case PNP_INVALID_HANDLE:
191 printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
193 case PNP_BAD_PARAMETER:
194 printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", module);
197 printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", module);
199 case PNP_EVENTS_NOT_PENDING:
200 printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
202 case PNP_SYSTEM_NOT_DOCKED:
203 printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", module);
205 case PNP_NO_ISA_PNP_CARDS:
206 printk(KERN_ERR "PnPBIOS: %s: no isapnp cards are installed on this system\n", module);
208 case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
209 printk(KERN_ERR "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", module);
211 case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
212 printk(KERN_ERR "PnPBIOS: %s: unable to undock, the system does not have a battery\n", module);
214 case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
215 printk(KERN_ERR "PnPBIOS: %s: could not dock due to resource conflicts\n", module);
217 case PNP_BUFFER_TOO_SMALL:
218 printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", module);
220 case PNP_USE_ESCD_SUPPORT:
221 printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
223 case PNP_MESSAGE_NOT_SUPPORTED:
224 printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", module);
226 case PNP_HARDWARE_ERROR:
227 printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n", module);
230 printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, status);
237 * PnP BIOS Low Level Calls
240 #define PNP_GET_NUM_SYS_DEV_NODES 0x00
241 #define PNP_GET_SYS_DEV_NODE 0x01
242 #define PNP_SET_SYS_DEV_NODE 0x02
243 #define PNP_GET_EVENT 0x03
244 #define PNP_SEND_MESSAGE 0x04
245 #define PNP_GET_DOCKING_STATION_INFORMATION 0x05
246 #define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
247 #define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
248 #define PNP_GET_APM_ID_TABLE 0x0b
249 #define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
250 #define PNP_GET_ESCD_INFO 0x41
251 #define PNP_READ_ESCD 0x42
252 #define PNP_WRITE_ESCD 0x43
255 * Call PnP BIOS with function 0x00, "get number of system device nodes"
257 static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
260 if (!pnp_bios_present())
261 return PNP_FUNCTION_NOT_SUPPORTED;
262 status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1, PNP_DS, 0, 0,
263 data, sizeof(struct pnp_dev_node_info), NULL, 0);
264 data->no_nodes &= 0xff;
268 int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
270 int status = __pnp_bios_dev_node_info( data );
272 pnpbios_print_status( "dev_node_info", status );
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.
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
290 static int __pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
293 if (!pnp_bios_present())
294 return PNP_FUNCTION_NOT_SUPPORTED;
295 if ( !boot && pnpbios_dont_use_current_config )
296 return PNP_FUNCTION_NOT_SUPPORTED;
297 status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, boot ? 2 : 1, PNP_DS, 0,
298 nodenum, sizeof(char), data, 65536);
302 int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
305 status = __pnp_bios_get_dev_node( nodenum, boot, data );
307 pnpbios_print_status( "get_dev_node", status );
313 * Call PnP BIOS with function 0x02, "set system device node"
314 * Input: *nodenum = desired node,
315 * boot = whether to set nonvolatile boot (!=0)
316 * or volatile current (0) config
318 static int __pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
321 if (!pnp_bios_present())
322 return PNP_FUNCTION_NOT_SUPPORTED;
323 if ( !boot && pnpbios_dont_use_current_config )
324 return PNP_FUNCTION_NOT_SUPPORTED;
325 status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, boot ? 2 : 1, PNP_DS, 0, 0,
326 data, 65536, NULL, 0);
330 int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
333 status = __pnp_bios_set_dev_node( nodenum, boot, data );
335 pnpbios_print_status( "set_dev_node", status );
338 if ( !boot ) { /* Update devlist */
339 status = pnp_bios_get_dev_node( &nodenum, boot, data );
348 * Call PnP BIOS with function 0x03, "get event"
350 static int pnp_bios_get_event(u16 *event)
353 if (!pnp_bios_present())
354 return PNP_FUNCTION_NOT_SUPPORTED;
355 status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0 ,0 ,0,
356 event, sizeof(u16), NULL, 0);
363 * Call PnP BIOS with function 0x04, "send message"
365 static int pnp_bios_send_message(u16 message)
368 if (!pnp_bios_present())
369 return PNP_FUNCTION_NOT_SUPPORTED;
370 status = call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0, 0, 0, 0);
376 * Call PnP BIOS with function 0x05, "get docking station information"
378 int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
381 if (!pnp_bios_present())
382 return PNP_FUNCTION_NOT_SUPPORTED;
383 status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
384 data, sizeof(struct pnp_docking_station_info), NULL, 0);
390 * Call PnP BIOS with function 0x09, "set statically allocated resource
393 static int pnp_bios_set_stat_res(char *info)
396 if (!pnp_bios_present())
397 return PNP_FUNCTION_NOT_SUPPORTED;
398 status = call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
399 info, *((u16 *) info), 0, 0);
405 * Call PnP BIOS with function 0x0a, "get statically allocated resource
408 static int __pnp_bios_get_stat_res(char *info)
411 if (!pnp_bios_present())
412 return PNP_FUNCTION_NOT_SUPPORTED;
413 status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
414 info, 65536, NULL, 0);
418 int pnp_bios_get_stat_res(char *info)
421 status = __pnp_bios_get_stat_res( info );
423 pnpbios_print_status( "get_stat_res", status );
429 * Call PnP BIOS with function 0x0b, "get APM id table"
431 static int pnp_bios_apm_id_table(char *table, u16 *size)
434 if (!pnp_bios_present())
435 return PNP_FUNCTION_NOT_SUPPORTED;
436 status = call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS, 0, 0,
437 table, *size, size, sizeof(u16));
443 * Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
445 static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
448 if (!pnp_bios_present())
449 return PNP_FUNCTION_NOT_SUPPORTED;
450 status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
451 data, sizeof(struct pnp_isa_config_struc), NULL, 0);
455 int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
458 status = __pnp_bios_isapnp_config( data );
460 pnpbios_print_status( "isapnp_config", status );
465 * Call PnP BIOS with function 0x41, "get ESCD info"
467 static int __pnp_bios_escd_info(struct escd_info_struc *data)
470 if (!pnp_bios_present())
471 return ESCD_FUNCTION_NOT_SUPPORTED;
472 status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, PNP_TS1, PNP_DS,
473 data, sizeof(struct escd_info_struc), NULL, 0);
477 int pnp_bios_escd_info(struct escd_info_struc *data)
480 status = __pnp_bios_escd_info( data );
482 pnpbios_print_status( "escd_info", status );
487 * Call PnP BIOS function 0x42, "read ESCD"
488 * nvram_base is determined by calling escd_info
490 static int __pnp_bios_read_escd(char *data, u32 nvram_base)
493 if (!pnp_bios_present())
494 return ESCD_FUNCTION_NOT_SUPPORTED;
495 status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
496 data, 65536, __va(nvram_base), 65536);
500 int pnp_bios_read_escd(char *data, u32 nvram_base)
503 status = __pnp_bios_read_escd( data, nvram_base );
505 pnpbios_print_status( "read_escd", status );
511 * Call PnP BIOS function 0x43, "write ESCD"
513 static int pnp_bios_write_escd(char *data, u32 nvram_base)
516 if (!pnp_bios_present())
517 return ESCD_FUNCTION_NOT_SUPPORTED;
518 status = call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
519 data, 65536, __va(nvram_base), 65536);
529 void pnpbios_calls_init(union pnp_bios_install_struct *header)
532 spin_lock_init(&pnp_bios_lock);
533 pnp_bios_callpoint.offset = header->fields.pm16offset;
534 pnp_bios_callpoint.segment = PNP_CS16;
536 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
537 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
538 for(i=0; i < NR_CPUS; i++)
540 Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024);
541 Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024);
542 Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024);