diff options
Diffstat (limited to 'drivers/pnp/pnpbios/bioscalls.c')
| -rw-r--r-- | drivers/pnp/pnpbios/bioscalls.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c new file mode 100644 index 000000000000..6b7583f497d0 --- /dev/null +++ b/drivers/pnp/pnpbios/bioscalls.c @@ -0,0 +1,544 @@ +/* + * bioscalls.c - the lowlevel layer of the PnPBIOS driver + * + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/linkage.h> +#include <linux/kernel.h> +#include <linux/pnpbios.h> +#include <linux/device.h> +#include <linux/pnp.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/slab.h> +#include <linux/kmod.h> +#include <linux/completion.h> +#include <linux/spinlock.h> + +#include <asm/page.h> +#include <asm/desc.h> +#include <asm/system.h> +#include <asm/byteorder.h> + +#include "pnpbios.h" + +static struct { + u16 offset; + u16 segment; +} pnp_bios_callpoint; + + +/* The PnP BIOS entries in the GDT */ +#define PNP_GDT (GDT_ENTRY_PNPBIOS_BASE * 8) + +#define PNP_CS32 (PNP_GDT+0x00) /* segment for calling fn */ +#define PNP_CS16 (PNP_GDT+0x08) /* code segment for BIOS */ +#define PNP_DS (PNP_GDT+0x10) /* data segment for BIOS */ +#define PNP_TS1 (PNP_GDT+0x18) /* transfer data segment */ +#define PNP_TS2 (PNP_GDT+0x20) /* another data segment */ + +/* + * These are some opcodes for a "static asmlinkage" + * As this code is *not* executed inside the linux kernel segment, but in a + * alias at offset 0, we need a far return that can not be compiled by + * default (please, prove me wrong! this is *really* ugly!) + * This is the only way to get the bios to return into the kernel code, + * because the bios code runs in 16 bit protected mode and therefore can only + * return to the caller if the call is within the first 64kB, and the linux + * kernel begins at offset 3GB... + */ + +asmlinkage void pnp_bios_callfunc(void); + +__asm__( + ".text \n" + __ALIGN_STR "\n" + "pnp_bios_callfunc:\n" + " pushl %edx \n" + " pushl %ecx \n" + " pushl %ebx \n" + " pushl %eax \n" + " lcallw *pnp_bios_callpoint\n" + " addl $16, %esp \n" + " lret \n" + ".previous \n" +); + +#define Q_SET_SEL(cpu, selname, address, size) \ +do { \ +set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], __va((u32)(address))); \ +set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \ +} while(0) + +#define Q2_SET_SEL(cpu, selname, address, size) \ +do { \ +set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], (u32)(address)); \ +set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \ +} while(0) + +static struct desc_struct bad_bios_desc = { 0, 0x00409200 }; + +/* + * At some point we want to use this stack frame pointer to unwind + * after PnP BIOS oopses. + */ + +u32 pnp_bios_fault_esp; +u32 pnp_bios_fault_eip; +u32 pnp_bios_is_utter_crap = 0; + +static spinlock_t pnp_bios_lock; + + +/* + * Support Functions + */ + +static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, + u16 arg4, u16 arg5, u16 arg6, u16 arg7, + void *ts1_base, u32 ts1_size, + void *ts2_base, u32 ts2_size) +{ + unsigned long flags; + u16 status; + struct desc_struct save_desc_40; + int cpu; + + /* + * PnP BIOSes are generally not terribly re-entrant. + * Also, don't rely on them to save everything correctly. + */ + if(pnp_bios_is_utter_crap) + return PNP_FUNCTION_NOT_SUPPORTED; + + cpu = get_cpu(); + save_desc_40 = per_cpu(cpu_gdt_table,cpu)[0x40 / 8]; + per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = bad_bios_desc; + + /* On some boxes IRQ's during PnP BIOS calls are deadly. */ + spin_lock_irqsave(&pnp_bios_lock, flags); + + /* The lock prevents us bouncing CPU here */ + if (ts1_size) + Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size); + if (ts2_size) + Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size); + + __asm__ __volatile__( + "pushl %%ebp\n\t" + "pushl %%edi\n\t" + "pushl %%esi\n\t" + "pushl %%ds\n\t" + "pushl %%es\n\t" + "pushl %%fs\n\t" + "pushl %%gs\n\t" + "pushfl\n\t" + "movl %%esp, pnp_bios_fault_esp\n\t" + "movl $1f, pnp_bios_fault_eip\n\t" + "lcall %5,%6\n\t" + "1:popfl\n\t" + "popl %%gs\n\t" + "popl %%fs\n\t" + "popl %%es\n\t" + "popl %%ds\n\t" + "popl %%esi\n\t" + "popl %%edi\n\t" + "popl %%ebp\n\t" + : "=a" (status) + : "0" ((func) | (((u32)arg1) << 16)), + "b" ((arg2) | (((u32)arg3) << 16)), + "c" ((arg4) | (((u32)arg5) << 16)), + "d" ((arg6) | (((u32)arg7) << 16)), + "i" (PNP_CS32), + "i" (0) + : "memory" + ); + spin_unlock_irqrestore(&pnp_bios_lock, flags); + + per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = save_desc_40; + put_cpu(); + + /* If we get here and this is set then the PnP BIOS faulted on us. */ + if(pnp_bios_is_utter_crap) + { + printk(KERN_ERR "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n"); + printk(KERN_ERR "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n"); + printk(KERN_ERR "PnPBIOS: Check with your vendor for an updated BIOS\n"); + } + + return status; +} + +void pnpbios_print_status(const char * module, u16 status) +{ + switch(status) { + case PNP_SUCCESS: + printk(KERN_ERR "PnPBIOS: %s: function successful\n", module); + break; + case PNP_NOT_SET_STATICALLY: + printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", module); + break; + case PNP_UNKNOWN_FUNCTION: + printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", module); + break; + case PNP_FUNCTION_NOT_SUPPORTED: + printk(KERN_ERR "PnPBIOS: %s: function not supported on this system\n", module); + break; + case PNP_INVALID_HANDLE: + printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module); + break; + case PNP_BAD_PARAMETER: + printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", module); + break; + case PNP_SET_FAILED: + printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", module); + break; + case PNP_EVENTS_NOT_PENDING: + printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module); + break; + case PNP_SYSTEM_NOT_DOCKED: + printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", module); + break; + case PNP_NO_ISA_PNP_CARDS: + printk(KERN_ERR "PnPBIOS: %s: no isapnp cards are installed on this system\n", module); + break; + case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES: + printk(KERN_ERR "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", module); + break; + case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY: + printk(KERN_ERR "PnPBIOS: %s: unable to undock, the system does not have a battery\n", module); + break; + case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT: + printk(KERN_ERR "PnPBIOS: %s: could not dock due to resource conflicts\n", module); + break; + case PNP_BUFFER_TOO_SMALL: + printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", module); + break; + case PNP_USE_ESCD_SUPPORT: + printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module); + break; + case PNP_MESSAGE_NOT_SUPPORTED: + printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", module); + break; + case PNP_HARDWARE_ERROR: + printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n", module); + break; + default: + printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, status); + break; + } +} + + +/* + * PnP BIOS Low Level Calls + */ + +#define PNP_GET_NUM_SYS_DEV_NODES 0x00 +#define PNP_GET_SYS_DEV_NODE 0x01 +#define PNP_SET_SYS_DEV_NODE 0x02 +#define PNP_GET_EVENT 0x03 +#define PNP_SEND_MESSAGE 0x04 +#define PNP_GET_DOCKING_STATION_INFORMATION 0x05 +#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09 +#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a +#define PNP_GET_APM_ID_TABLE 0x0b +#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40 +#define PNP_GET_ESCD_INFO 0x41 +#define PNP_READ_ESCD 0x42 +#define PNP_WRITE_ESCD 0x43 + +/* + * Call PnP BIOS with function 0x00, "get number of system device nodes" + */ +static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1, PNP_DS, 0, 0, + data, sizeof(struct pnp_dev_node_info), NULL, 0); + data->no_nodes &= 0xff; + return status; +} + +int pnp_bios_dev_node_info(struct pnp_dev_node_info *data) +{ + int status = __pnp_bios_dev_node_info( data ); + if ( status ) + pnpbios_print_status( "dev_node_info", status ); + return status; +} + +/* + * Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible + * death if they are asked to access the "current" configuration. + * Therefore, if it's a matter of indifference, it's better to call + * get_dev_node() and set_dev_node() with boot=1 rather than with boot=0. + */ + +/* + * Call PnP BIOS with function 0x01, "get system device node" + * Input: *nodenum = desired node, + * boot = whether to get nonvolatile boot (!=0) + * or volatile current (0) config + * Output: *nodenum=next node or 0xff if no more nodes + */ +static int __pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + if ( !boot && pnpbios_dont_use_current_config ) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, boot ? 2 : 1, PNP_DS, 0, + nodenum, sizeof(char), data, 65536); + return status; +} + +int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data) +{ + int status; + status = __pnp_bios_get_dev_node( nodenum, boot, data ); + if ( status ) + pnpbios_print_status( "get_dev_node", status ); + return status; +} + + +/* + * Call PnP BIOS with function 0x02, "set system device node" + * Input: *nodenum = desired node, + * boot = whether to set nonvolatile boot (!=0) + * or volatile current (0) config + */ +static int __pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + if ( !boot && pnpbios_dont_use_current_config ) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, boot ? 2 : 1, PNP_DS, 0, 0, + data, 65536, NULL, 0); + return status; +} + +int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data) +{ + int status; + status = __pnp_bios_set_dev_node( nodenum, boot, data ); + if ( status ) { + pnpbios_print_status( "set_dev_node", status ); + return status; + } + if ( !boot ) { /* Update devlist */ + status = pnp_bios_get_dev_node( &nodenum, boot, data ); + if ( status ) + return status; + } + return status; +} + +#if needed +/* + * Call PnP BIOS with function 0x03, "get event" + */ +static int pnp_bios_get_event(u16 *event) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0 ,0 ,0, + event, sizeof(u16), NULL, 0); + return status; +} +#endif + +#if needed +/* + * Call PnP BIOS with function 0x04, "send message" + */ +static int pnp_bios_send_message(u16 message) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0, 0, 0, 0); + return status; +} +#endif + +/* + * Call PnP BIOS with function 0x05, "get docking station information" + */ +int pnp_bios_dock_station_info(struct pnp_docking_station_info *data) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0, + data, sizeof(struct pnp_docking_station_info), NULL, 0); + return status; +} + +#if needed +/* + * Call PnP BIOS with function 0x09, "set statically allocated resource + * information" + */ +static int pnp_bios_set_stat_res(char *info) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0, + info, *((u16 *) info), 0, 0); + return status; +} +#endif + +/* + * Call PnP BIOS with function 0x0a, "get statically allocated resource + * information" + */ +static int __pnp_bios_get_stat_res(char *info) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0, + info, 65536, NULL, 0); + return status; +} + +int pnp_bios_get_stat_res(char *info) +{ + int status; + status = __pnp_bios_get_stat_res( info ); + if ( status ) + pnpbios_print_status( "get_stat_res", status ); + return status; +} + +#if needed +/* + * Call PnP BIOS with function 0x0b, "get APM id table" + */ +static int pnp_bios_apm_id_table(char *table, u16 *size) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS, 0, 0, + table, *size, size, sizeof(u16)); + return status; +} +#endif + +/* + * Call PnP BIOS with function 0x40, "get isa pnp configuration structure" + */ +static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data) +{ + u16 status; + if (!pnp_bios_present()) + return PNP_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0, + data, sizeof(struct pnp_isa_config_struc), NULL, 0); + return status; +} + +int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data) +{ + int status; + status = __pnp_bios_isapnp_config( data ); + if ( status ) + pnpbios_print_status( "isapnp_config", status ); + return status; +} + +/* + * Call PnP BIOS with function 0x41, "get ESCD info" + */ +static int __pnp_bios_escd_info(struct escd_info_struc *data) +{ + u16 status; + if (!pnp_bios_present()) + return ESCD_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, PNP_TS1, PNP_DS, + data, sizeof(struct escd_info_struc), NULL, 0); + return status; +} + +int pnp_bios_escd_info(struct escd_info_struc *data) +{ + int status; + status = __pnp_bios_escd_info( data ); + if ( status ) + pnpbios_print_status( "escd_info", status ); + return status; +} + +/* + * Call PnP BIOS function 0x42, "read ESCD" + * nvram_base is determined by calling escd_info + */ +static int __pnp_bios_read_escd(char *data, u32 nvram_base) +{ + u16 status; + if (!pnp_bios_present()) + return ESCD_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0, + data, 65536, __va(nvram_base), 65536); + return status; +} + +int pnp_bios_read_escd(char *data, u32 nvram_base) +{ + int status; + status = __pnp_bios_read_escd( data, nvram_base ); + if ( status ) + pnpbios_print_status( "read_escd", status ); + return status; +} + +#if needed +/* + * Call PnP BIOS function 0x43, "write ESCD" + */ +static int pnp_bios_write_escd(char *data, u32 nvram_base) +{ + u16 status; + if (!pnp_bios_present()) + return ESCD_FUNCTION_NOT_SUPPORTED; + status = call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0, + data, 65536, __va(nvram_base), 65536); + return status; +} +#endif + + +/* + * Initialization + */ + +void pnpbios_calls_init(union pnp_bios_install_struct *header) +{ + int i; + spin_lock_init(&pnp_bios_lock); + pnp_bios_callpoint.offset = header->fields.pm16offset; + pnp_bios_callpoint.segment = PNP_CS16; + + set_base(bad_bios_desc, __va((unsigned long)0x40 << 4)); + _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4)); + for(i=0; i < NR_CPUS; i++) + { + Q2_SET_SEL(i, PNP_CS32, &pnp_bios_callfunc, 64 * 1024); + Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024); + Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024); + } +} |
