openslx/kernel-qcow2-linux.git - In-kernel qcow2 (Kernel part)

	Commit message (Expand)	Author	Age	Files	Lines
*	PNPBIOS: remove include/linux/pnpbios.h	Bjorn Helgaas	2008-04-29	1	-0/+136
*	PNP: remove more pnp_resource_table arguments	Bjorn Helgaas	2008-04-29	1	-2/+2
*	[PATCH] pnp: consolidate kmalloc wrappers	Bjorn Helgaas	2005-09-08	1	-1/+0
*	Linux-2.6.12-rc2	Linus Torvalds	2005-04-17	1	-0/+47

/* * 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/device.h> #include <linux/pnp.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/kmod.h> #include <linux/completion.h> #include <linux/spinlock.h> #include <asm/page.h> #include <asm/desc.h> #include <asm/byteorder.h> #include "pnpbios.h" static struct { u16 offset; u16 segment; } pnp_bios_callpoint; /* * 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 Q2_SET_SEL(cpu, selname, address, size) \ do { \ struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \ set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \ set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \ } while(0) static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); /* * 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 = get_cpu_gdt_table(cpu)[0x40 / 8]; get_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); get_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 occurred\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; u16 tmp_nodenum; if (!pnp_bios_present()) return PNP_FUNCTION_NOT_SUPPORTED; if (!boot && pnpbios_dont_use_current_config) return PNP_FUNCTION_NOT_SUPPORTED; tmp_nodenum = *nodenum; status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum, sizeof(tmp_nodenum), data, 65536); *nodenum = tmp_nodenum; 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; } /* * 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; } /* * 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; } /* * 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; } 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; for_each_possible_cpu(i) { struct desc_struct *gdt = get_cpu_gdt_table(i); if (!gdt) continue; set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32], (unsigned long)&pnp_bios_callfunc); set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16], (unsigned long)__va(header->fields.pm16cseg)); set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS], (unsigned long)__va(header->fields.pm16dseg)); } }