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/device.h>
11 #include <linux/pnp.h>
13 #include <linux/smp.h>
14 #include <linux/kmod.h>
15 #include <linux/completion.h>
16 #include <linux/spinlock.h>
20 #include <asm/byteorder.h>
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...
40 asmlinkage void pnp_bios_callfunc(void);
44 "pnp_bios_callfunc:\n"
49 " lcallw *pnp_bios_callpoint\n"
54 #define Q2_SET_SEL(cpu, selname, address, size) \
56 struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
57 set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
58 set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
61 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
62 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
65 * At some point we want to use this stack frame pointer to unwind
66 * after PnP BIOS oopses.
69 u32 pnp_bios_fault_esp;
70 u32 pnp_bios_fault_eip;
71 u32 pnp_bios_is_utter_crap = 0;
73 static spinlock_t pnp_bios_lock;
79 static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
80 u16 arg4, u16 arg5, u16 arg6, u16 arg7,
81 void *ts1_base, u32 ts1_size,
82 void *ts2_base, u32 ts2_size)
86 struct desc_struct save_desc_40;
90 * PnP BIOSes are generally not terribly re-entrant.
91 * Also, don't rely on them to save everything correctly.
93 if (pnp_bios_is_utter_crap)
94 return PNP_FUNCTION_NOT_SUPPORTED;
97 save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
98 get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
100 /* On some boxes IRQ's during PnP BIOS calls are deadly. */
101 spin_lock_irqsave(&pnp_bios_lock, flags);
103 /* The lock prevents us bouncing CPU here */
105 Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
107 Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
109 __asm__ __volatile__("pushl %%ebp\n\t"
117 "movl %%esp, pnp_bios_fault_esp\n\t"
118 "movl $1f, pnp_bios_fault_eip\n\t"
127 "popl %%ebp\n\t":"=a"(status)
128 :"0"((func) | (((u32) arg1) << 16)),
129 "b"((arg2) | (((u32) arg3) << 16)),
130 "c"((arg4) | (((u32) arg5) << 16)),
131 "d"((arg6) | (((u32) arg7) << 16)),
132 "i"(PNP_CS32), "i"(0)
134 spin_unlock_irqrestore(&pnp_bios_lock, flags);
136 get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
139 /* If we get here and this is set then the PnP BIOS faulted on us. */
140 if (pnp_bios_is_utter_crap) {
142 "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
144 "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
146 "PnPBIOS: Check with your vendor for an updated BIOS\n");
152 void pnpbios_print_status(const char *module, u16 status)
156 printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
158 case PNP_NOT_SET_STATICALLY:
159 printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n",
162 case PNP_UNKNOWN_FUNCTION:
163 printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n",
166 case PNP_FUNCTION_NOT_SUPPORTED:
168 "PnPBIOS: %s: function not supported on this system\n",
171 case PNP_INVALID_HANDLE:
172 printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
174 case PNP_BAD_PARAMETER:
175 printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n",
179 printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n",
182 case PNP_EVENTS_NOT_PENDING:
183 printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
185 case PNP_SYSTEM_NOT_DOCKED:
186 printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n",
189 case PNP_NO_ISA_PNP_CARDS:
191 "PnPBIOS: %s: no isapnp cards are installed on this system\n",
194 case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
196 "PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
199 case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
201 "PnPBIOS: %s: unable to undock, the system does not have a battery\n",
204 case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
206 "PnPBIOS: %s: could not dock due to resource conflicts\n",
209 case PNP_BUFFER_TOO_SMALL:
210 printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n",
213 case PNP_USE_ESCD_SUPPORT:
214 printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
216 case PNP_MESSAGE_NOT_SUPPORTED:
217 printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n",
220 case PNP_HARDWARE_ERROR:
221 printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occurred\n",
225 printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module,
232 * PnP BIOS Low Level Calls
235 #define PNP_GET_NUM_SYS_DEV_NODES 0x00
236 #define PNP_GET_SYS_DEV_NODE 0x01
237 #define PNP_SET_SYS_DEV_NODE 0x02
238 #define PNP_GET_EVENT 0x03
239 #define PNP_SEND_MESSAGE 0x04
240 #define PNP_GET_DOCKING_STATION_INFORMATION 0x05
241 #define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
242 #define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
243 #define PNP_GET_APM_ID_TABLE 0x0b
244 #define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
245 #define PNP_GET_ESCD_INFO 0x41
246 #define PNP_READ_ESCD 0x42
247 #define PNP_WRITE_ESCD 0x43
250 * Call PnP BIOS with function 0x00, "get number of system device nodes"
252 static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
256 if (!pnp_bios_present())
257 return PNP_FUNCTION_NOT_SUPPORTED;
258 status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2,
259 PNP_TS1, PNP_DS, 0, 0, data,
260 sizeof(struct pnp_dev_node_info), NULL, 0);
261 data->no_nodes &= 0xff;
265 int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
267 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)
294 if (!pnp_bios_present())
295 return PNP_FUNCTION_NOT_SUPPORTED;
296 if (!boot && pnpbios_dont_use_current_config)
297 return PNP_FUNCTION_NOT_SUPPORTED;
298 tmp_nodenum = *nodenum;
299 status = 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)
310 status = __pnp_bios_get_dev_node(nodenum, boot, data);
312 pnpbios_print_status("get_dev_node", status);
317 * Call PnP BIOS with function 0x02, "set system device node"
318 * Input: *nodenum = desired node,
319 * boot = whether to set nonvolatile boot (!=0)
320 * or volatile current (0) config
322 static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
323 struct pnp_bios_node *data)
327 if (!pnp_bios_present())
328 return PNP_FUNCTION_NOT_SUPPORTED;
329 if (!boot && pnpbios_dont_use_current_config)
330 return PNP_FUNCTION_NOT_SUPPORTED;
331 status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1,
332 boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL,
337 int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
341 status = __pnp_bios_set_dev_node(nodenum, boot, data);
343 pnpbios_print_status("set_dev_node", status);
346 if (!boot) { /* Update devlist */
347 status = pnp_bios_get_dev_node(&nodenum, boot, data);
355 * Call PnP BIOS with function 0x05, "get docking station information"
357 int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
361 if (!pnp_bios_present())
362 return PNP_FUNCTION_NOT_SUPPORTED;
363 status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1,
364 PNP_DS, 0, 0, 0, 0, data,
365 sizeof(struct pnp_docking_station_info), NULL,
371 * Call PnP BIOS with function 0x0a, "get statically allocated resource
374 static int __pnp_bios_get_stat_res(char *info)
378 if (!pnp_bios_present())
379 return PNP_FUNCTION_NOT_SUPPORTED;
380 status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1,
381 PNP_DS, 0, 0, 0, 0, info, 65536, NULL, 0);
385 int pnp_bios_get_stat_res(char *info)
389 status = __pnp_bios_get_stat_res(info);
391 pnpbios_print_status("get_stat_res", status);
396 * Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
398 static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
402 if (!pnp_bios_present())
403 return PNP_FUNCTION_NOT_SUPPORTED;
404 status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS,
406 sizeof(struct pnp_isa_config_struc), NULL, 0);
410 int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
414 status = __pnp_bios_isapnp_config(data);
416 pnpbios_print_status("isapnp_config", status);
421 * Call PnP BIOS with function 0x41, "get ESCD info"
423 static int __pnp_bios_escd_info(struct escd_info_struc *data)
427 if (!pnp_bios_present())
428 return ESCD_FUNCTION_NOT_SUPPORTED;
429 status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4,
430 PNP_TS1, PNP_DS, data,
431 sizeof(struct escd_info_struc), NULL, 0);
435 int pnp_bios_escd_info(struct escd_info_struc *data)
439 status = __pnp_bios_escd_info(data);
441 pnpbios_print_status("escd_info", status);
446 * Call PnP BIOS function 0x42, "read ESCD"
447 * nvram_base is determined by calling escd_info
449 static int __pnp_bios_read_escd(char *data, u32 nvram_base)
453 if (!pnp_bios_present())
454 return ESCD_FUNCTION_NOT_SUPPORTED;
455 status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0,
456 0, data, 65536, __va(nvram_base), 65536);
460 int pnp_bios_read_escd(char *data, u32 nvram_base)
464 status = __pnp_bios_read_escd(data, nvram_base);
466 pnpbios_print_status("read_escd", status);
470 void pnpbios_calls_init(union pnp_bios_install_struct *header)
474 spin_lock_init(&pnp_bios_lock);
475 pnp_bios_callpoint.offset = header->fields.pm16offset;
476 pnp_bios_callpoint.segment = PNP_CS16;
478 for_each_possible_cpu(i) {
479 struct desc_struct *gdt = get_cpu_gdt_table(i);
482 set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32],
483 (unsigned long)&pnp_bios_callfunc);
484 set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16],
485 (unsigned long)__va(header->fields.pm16cseg));
486 set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS],
487 (unsigned long)__va(header->fields.pm16dseg));