2 * bioscalls.c - the lowlevel layer of the PnPBIOS driver
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>
10 #include <linux/pnpbios.h>
11 #include <linux/device.h>
12 #include <linux/pnp.h>
14 #include <linux/smp.h>
15 #include <linux/slab.h>
16 #include <linux/kmod.h>
17 #include <linux/completion.h>
18 #include <linux/spinlock.h>
22 #include <asm/system.h>
23 #include <asm/byteorder.h>
33 * These are some opcodes for a "static asmlinkage"
34 * As this code is *not* executed inside the linux kernel segment, but in a
35 * alias at offset 0, we need a far return that can not be compiled by
36 * default (please, prove me wrong! this is *really* ugly!)
37 * This is the only way to get the bios to return into the kernel code,
38 * because the bios code runs in 16 bit protected mode and therefore can only
39 * return to the caller if the call is within the first 64kB, and the linux
40 * kernel begins at offset 3GB...
43 asmlinkage void pnp_bios_callfunc(void);
47 "pnp_bios_callfunc:\n"
52 " lcallw *pnp_bios_callpoint\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"
129 "popl %%ebp\n\t":"=a"(status)
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)
136 spin_unlock_irqrestore(&pnp_bios_lock, flags);
138 get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
141 /* If we get here and this is set then the PnP BIOS faulted on us. */
142 if (pnp_bios_is_utter_crap) {
144 "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
146 "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
148 "PnPBIOS: Check with your vendor for an updated BIOS\n");
154 void pnpbios_print_status(const char *module, u16 status)
158 printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
160 case PNP_NOT_SET_STATICALLY:
161 printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n",
164 case PNP_UNKNOWN_FUNCTION:
165 printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n",
168 case PNP_FUNCTION_NOT_SUPPORTED:
170 "PnPBIOS: %s: function not supported on this system\n",
173 case PNP_INVALID_HANDLE:
174 printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
176 case PNP_BAD_PARAMETER:
177 printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n",
181 printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n",
184 case PNP_EVENTS_NOT_PENDING:
185 printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
187 case PNP_SYSTEM_NOT_DOCKED:
188 printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n",
191 case PNP_NO_ISA_PNP_CARDS:
193 "PnPBIOS: %s: no isapnp cards are installed on this system\n",
196 case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
198 "PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
201 case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
203 "PnPBIOS: %s: unable to undock, the system does not have a battery\n",
206 case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
208 "PnPBIOS: %s: could not dock due to resource conflicts\n",
211 case PNP_BUFFER_TOO_SMALL:
212 printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n",
215 case PNP_USE_ESCD_SUPPORT:
216 printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
218 case PNP_MESSAGE_NOT_SUPPORTED:
219 printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n",
222 case PNP_HARDWARE_ERROR:
223 printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n",
227 printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module,
234 * PnP BIOS Low Level Calls
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
252 * Call PnP BIOS with function 0x00, "get number of system device nodes"
254 static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
258 if (!pnp_bios_present())
259 return PNP_FUNCTION_NOT_SUPPORTED;
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);
263 data->no_nodes &= 0xff;
267 int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
269 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,
291 struct pnp_bios_node *data)
296 if (!pnp_bios_present())
297 return PNP_FUNCTION_NOT_SUPPORTED;
298 if (!boot && pnpbios_dont_use_current_config)
299 return PNP_FUNCTION_NOT_SUPPORTED;
300 tmp_nodenum = *nodenum;
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);
304 *nodenum = tmp_nodenum;
308 int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
312 status = __pnp_bios_get_dev_node(nodenum, boot, data);
314 pnpbios_print_status("get_dev_node", status);
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
324 static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
325 struct pnp_bios_node *data)
329 if (!pnp_bios_present())
330 return PNP_FUNCTION_NOT_SUPPORTED;
331 if (!boot && pnpbios_dont_use_current_config)
332 return PNP_FUNCTION_NOT_SUPPORTED;
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,
339 int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
343 status = __pnp_bios_set_dev_node(nodenum, boot, data);
345 pnpbios_print_status("set_dev_node", status);
348 if (!boot) { /* Update devlist */
349 status = pnp_bios_get_dev_node(&nodenum, boot, data);
357 * Call PnP BIOS with function 0x05, "get docking station information"
359 int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
363 if (!pnp_bios_present())
364 return PNP_FUNCTION_NOT_SUPPORTED;
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,
373 * Call PnP BIOS with function 0x0a, "get statically allocated resource
376 static int __pnp_bios_get_stat_res(char *info)
380 if (!pnp_bios_present())
381 return PNP_FUNCTION_NOT_SUPPORTED;
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);
387 int pnp_bios_get_stat_res(char *info)
391 status = __pnp_bios_get_stat_res(info);
393 pnpbios_print_status("get_stat_res", status);
398 * Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
400 static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
404 if (!pnp_bios_present())
405 return PNP_FUNCTION_NOT_SUPPORTED;
406 status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS,
408 sizeof(struct pnp_isa_config_struc), NULL, 0);
412 int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
416 status = __pnp_bios_isapnp_config(data);
418 pnpbios_print_status("isapnp_config", status);
423 * Call PnP BIOS with function 0x41, "get ESCD info"
425 static int __pnp_bios_escd_info(struct escd_info_struc *data)
429 if (!pnp_bios_present())
430 return ESCD_FUNCTION_NOT_SUPPORTED;
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);
437 int pnp_bios_escd_info(struct escd_info_struc *data)
441 status = __pnp_bios_escd_info(data);
443 pnpbios_print_status("escd_info", status);
448 * Call PnP BIOS function 0x42, "read ESCD"
449 * nvram_base is determined by calling escd_info
451 static int __pnp_bios_read_escd(char *data, u32 nvram_base)
455 if (!pnp_bios_present())
456 return ESCD_FUNCTION_NOT_SUPPORTED;
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);
462 int pnp_bios_read_escd(char *data, u32 nvram_base)
466 status = __pnp_bios_read_escd(data, nvram_base);
468 pnpbios_print_status("read_escd", status);
472 void pnpbios_calls_init(union pnp_bios_install_struct *header)
476 spin_lock_init(&pnp_bios_lock);
477 pnp_bios_callpoint.offset = header->fields.pm16offset;
478 pnp_bios_callpoint.segment = PNP_CS16;
480 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
481 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
482 for (i = 0; i < NR_CPUS; i++) {
483 struct desc_struct *gdt = get_cpu_gdt_table(i);
486 set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
487 set_base(gdt[GDT_ENTRY_PNPBIOS_CS16],
488 __va(header->fields.pm16cseg));
489 set_base(gdt[GDT_ENTRY_PNPBIOS_DS],
490 __va(header->fields.pm16dseg));