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 * These are some opcodes for a "static asmlinkage"
35 * As this code is *not* executed inside the linux kernel segment, but in a
36 * alias at offset 0, we need a far return that can not be compiled by
37 * default (please, prove me wrong! this is *really* ugly!)
38 * This is the only way to get the bios to return into the kernel code,
39 * because the bios code runs in 16 bit protected mode and therefore can only
40 * return to the caller if the call is within the first 64kB, and the linux
41 * kernel begins at offset 3GB...
44 asmlinkage void pnp_bios_callfunc(void);
48 "pnp_bios_callfunc:\n"
53 " lcallw *pnp_bios_callpoint\n"
55 " lret \n" ".previous \n");
57 #define Q2_SET_SEL(cpu, selname, address, size) \
59 struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
60 set_base(gdt[(selname) >> 3], (u32)(address)); \
61 set_limit(gdt[(selname) >> 3], size); \
64 static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
67 * At some point we want to use this stack frame pointer to unwind
68 * after PnP BIOS oopses.
71 u32 pnp_bios_fault_esp;
72 u32 pnp_bios_fault_eip;
73 u32 pnp_bios_is_utter_crap = 0;
75 static spinlock_t pnp_bios_lock;
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)
88 struct desc_struct save_desc_40;
92 * PnP BIOSes are generally not terribly re-entrant.
93 * Also, don't rely on them to save everything correctly.
95 if (pnp_bios_is_utter_crap)
96 return PNP_FUNCTION_NOT_SUPPORTED;
99 save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
100 get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
102 /* On some boxes IRQ's during PnP BIOS calls are deadly. */
103 spin_lock_irqsave(&pnp_bios_lock, flags);
105 /* The lock prevents us bouncing CPU here */
107 Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
109 Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
111 __asm__ __volatile__("pushl %%ebp\n\t"
119 "movl %%esp, pnp_bios_fault_esp\n\t"
120 "movl $1f, pnp_bios_fault_eip\n\t"
128 "popl %%edi\n\t" "popl %%ebp\n\t":"=a"(status)
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)
135 spin_unlock_irqrestore(&pnp_bios_lock, flags);
137 get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
140 /* If we get here and this is set then the PnP BIOS faulted on us. */
141 if (pnp_bios_is_utter_crap) {
143 "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
145 "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
147 "PnPBIOS: Check with your vendor for an updated BIOS\n");
153 void pnpbios_print_status(const char *module, u16 status)
157 printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
159 case PNP_NOT_SET_STATICALLY:
160 printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n",
163 case PNP_UNKNOWN_FUNCTION:
164 printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n",
167 case PNP_FUNCTION_NOT_SUPPORTED:
169 "PnPBIOS: %s: function not supported on this system\n",
172 case PNP_INVALID_HANDLE:
173 printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
175 case PNP_BAD_PARAMETER:
176 printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n",
180 printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n",
183 case PNP_EVENTS_NOT_PENDING:
184 printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
186 case PNP_SYSTEM_NOT_DOCKED:
187 printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n",
190 case PNP_NO_ISA_PNP_CARDS:
192 "PnPBIOS: %s: no isapnp cards are installed on this system\n",
195 case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
197 "PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
200 case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
202 "PnPBIOS: %s: unable to undock, the system does not have a battery\n",
205 case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
207 "PnPBIOS: %s: could not dock due to resource conflicts\n",
210 case PNP_BUFFER_TOO_SMALL:
211 printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n",
214 case PNP_USE_ESCD_SUPPORT:
215 printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
217 case PNP_MESSAGE_NOT_SUPPORTED:
218 printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n",
221 case PNP_HARDWARE_ERROR:
222 printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n",
226 printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module,
233 * PnP BIOS Low Level Calls
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
251 * Call PnP BIOS with function 0x00, "get number of system device nodes"
253 static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
256 if (!pnp_bios_present())
257 return PNP_FUNCTION_NOT_SUPPORTED;
259 call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1,
260 PNP_DS, 0, 0, data, sizeof(struct pnp_dev_node_info),
262 data->no_nodes &= 0xff;
266 int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
268 int status = __pnp_bios_dev_node_info(data);
270 pnpbios_print_status("dev_node_info", status);
275 * Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
276 * death if they are asked to access the "current" configuration.
277 * Therefore, if it's a matter of indifference, it's better to call
278 * get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
282 * Call PnP BIOS with function 0x01, "get system device node"
283 * Input: *nodenum = desired node,
284 * boot = whether to get nonvolatile boot (!=0)
285 * or volatile current (0) config
286 * Output: *nodenum=next node or 0xff if no more nodes
288 static int __pnp_bios_get_dev_node(u8 * nodenum, char boot,
289 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 tmp_nodenum = *nodenum;
299 call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2,
300 boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum,
301 sizeof(tmp_nodenum), data, 65536);
302 *nodenum = tmp_nodenum;
306 int pnp_bios_get_dev_node(u8 * nodenum, char boot, struct pnp_bios_node *data)
309 status = __pnp_bios_get_dev_node(nodenum, boot, data);
311 pnpbios_print_status("get_dev_node", status);
316 * Call PnP BIOS with function 0x02, "set system device node"
317 * Input: *nodenum = desired node,
318 * boot = whether to set nonvolatile boot (!=0)
319 * or volatile current (0) config
321 static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
322 struct pnp_bios_node *data)
325 if (!pnp_bios_present())
326 return PNP_FUNCTION_NOT_SUPPORTED;
327 if (!boot && pnpbios_dont_use_current_config)
328 return PNP_FUNCTION_NOT_SUPPORTED;
330 call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1,
331 boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL, 0);
335 int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
338 status = __pnp_bios_set_dev_node(nodenum, boot, data);
340 pnpbios_print_status("set_dev_node", status);
343 if (!boot) { /* Update devlist */
344 status = pnp_bios_get_dev_node(&nodenum, boot, data);
353 * Call PnP BIOS with function 0x03, "get event"
355 static int pnp_bios_get_event(u16 * event)
358 if (!pnp_bios_present())
359 return PNP_FUNCTION_NOT_SUPPORTED;
360 status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
361 event, sizeof(u16), NULL, 0);
368 * Call PnP BIOS with function 0x04, "send message"
370 static int pnp_bios_send_message(u16 message)
373 if (!pnp_bios_present())
374 return PNP_FUNCTION_NOT_SUPPORTED;
376 call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0,
383 * Call PnP BIOS with function 0x05, "get docking station information"
385 int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
388 if (!pnp_bios_present())
389 return PNP_FUNCTION_NOT_SUPPORTED;
391 call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1,
392 PNP_DS, 0, 0, 0, 0, data,
393 sizeof(struct pnp_docking_station_info), NULL, 0);
399 * Call PnP BIOS with function 0x09, "set statically allocated resource
402 static int pnp_bios_set_stat_res(char *info)
405 if (!pnp_bios_present())
406 return PNP_FUNCTION_NOT_SUPPORTED;
408 call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS,
409 0, 0, 0, 0, info, *((u16 *) info), 0, 0);
415 * Call PnP BIOS with function 0x0a, "get statically allocated resource
418 static int __pnp_bios_get_stat_res(char *info)
421 if (!pnp_bios_present())
422 return PNP_FUNCTION_NOT_SUPPORTED;
424 call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS,
425 0, 0, 0, 0, info, 65536, NULL, 0);
429 int pnp_bios_get_stat_res(char *info)
432 status = __pnp_bios_get_stat_res(info);
434 pnpbios_print_status("get_stat_res", status);
440 * Call PnP BIOS with function 0x0b, "get APM id table"
442 static int pnp_bios_apm_id_table(char *table, u16 * size)
445 if (!pnp_bios_present())
446 return PNP_FUNCTION_NOT_SUPPORTED;
448 call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS,
449 0, 0, table, *size, size, sizeof(u16));
455 * Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
457 static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
460 if (!pnp_bios_present())
461 return PNP_FUNCTION_NOT_SUPPORTED;
463 call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, 0,
464 0, 0, 0, data, sizeof(struct pnp_isa_config_struc),
469 int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
472 status = __pnp_bios_isapnp_config(data);
474 pnpbios_print_status("isapnp_config", status);
479 * Call PnP BIOS with function 0x41, "get ESCD info"
481 static int __pnp_bios_escd_info(struct escd_info_struc *data)
484 if (!pnp_bios_present())
485 return ESCD_FUNCTION_NOT_SUPPORTED;
487 call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, PNP_TS1,
488 PNP_DS, data, sizeof(struct escd_info_struc), NULL,
493 int pnp_bios_escd_info(struct escd_info_struc *data)
496 status = __pnp_bios_escd_info(data);
498 pnpbios_print_status("escd_info", status);
503 * Call PnP BIOS function 0x42, "read ESCD"
504 * nvram_base is determined by calling escd_info
506 static int __pnp_bios_read_escd(char *data, u32 nvram_base)
509 if (!pnp_bios_present())
510 return ESCD_FUNCTION_NOT_SUPPORTED;
512 call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
513 data, 65536, __va(nvram_base), 65536);
517 int pnp_bios_read_escd(char *data, u32 nvram_base)
520 status = __pnp_bios_read_escd(data, nvram_base);
522 pnpbios_print_status("read_escd", status);
528 * Call PnP BIOS function 0x43, "write ESCD"
530 static int pnp_bios_write_escd(char *data, u32 nvram_base)
533 if (!pnp_bios_present())
534 return ESCD_FUNCTION_NOT_SUPPORTED;
536 call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
537 data, 65536, __va(nvram_base), 65536);
546 void pnpbios_calls_init(union pnp_bios_install_struct *header)
549 spin_lock_init(&pnp_bios_lock);
550 pnp_bios_callpoint.offset = header->fields.pm16offset;
551 pnp_bios_callpoint.segment = PNP_CS16;
553 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
554 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
555 for (i = 0; i < NR_CPUS; i++) {
556 struct desc_struct *gdt = get_cpu_gdt_table(i);
559 set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
560 set_base(gdt[GDT_ENTRY_PNPBIOS_CS16],
561 __va(header->fields.pm16cseg));
562 set_base(gdt[GDT_ENTRY_PNPBIOS_DS],
563 __va(header->fields.pm16dseg));