mirror of
https://github.com/torvalds/linux.git
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1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
545 lines
15 KiB
C
545 lines
15 KiB
C
/*
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* bioscalls.c - the lowlevel layer of the PnPBIOS driver
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*
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/kernel.h>
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#include <linux/pnpbios.h>
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#include <linux/device.h>
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#include <linux/pnp.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/completion.h>
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#include <linux/spinlock.h>
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#include <asm/page.h>
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#include <asm/desc.h>
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#include <asm/system.h>
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#include <asm/byteorder.h>
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#include "pnpbios.h"
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static struct {
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u16 offset;
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u16 segment;
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} pnp_bios_callpoint;
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/* The PnP BIOS entries in the GDT */
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#define PNP_GDT (GDT_ENTRY_PNPBIOS_BASE * 8)
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#define PNP_CS32 (PNP_GDT+0x00) /* segment for calling fn */
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#define PNP_CS16 (PNP_GDT+0x08) /* code segment for BIOS */
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#define PNP_DS (PNP_GDT+0x10) /* data segment for BIOS */
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#define PNP_TS1 (PNP_GDT+0x18) /* transfer data segment */
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#define PNP_TS2 (PNP_GDT+0x20) /* another data segment */
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/*
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* These are some opcodes for a "static asmlinkage"
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* As this code is *not* executed inside the linux kernel segment, but in a
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* alias at offset 0, we need a far return that can not be compiled by
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* default (please, prove me wrong! this is *really* ugly!)
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* This is the only way to get the bios to return into the kernel code,
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* because the bios code runs in 16 bit protected mode and therefore can only
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* return to the caller if the call is within the first 64kB, and the linux
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* kernel begins at offset 3GB...
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*/
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asmlinkage void pnp_bios_callfunc(void);
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__asm__(
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".text \n"
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__ALIGN_STR "\n"
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"pnp_bios_callfunc:\n"
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" pushl %edx \n"
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" pushl %ecx \n"
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" pushl %ebx \n"
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" pushl %eax \n"
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" lcallw *pnp_bios_callpoint\n"
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" addl $16, %esp \n"
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" lret \n"
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".previous \n"
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);
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#define Q_SET_SEL(cpu, selname, address, size) \
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do { \
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set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], __va((u32)(address))); \
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set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \
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} while(0)
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#define Q2_SET_SEL(cpu, selname, address, size) \
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do { \
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set_base(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], (u32)(address)); \
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set_limit(per_cpu(cpu_gdt_table,cpu)[(selname) >> 3], size); \
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} while(0)
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static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
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/*
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* At some point we want to use this stack frame pointer to unwind
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* after PnP BIOS oopses.
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*/
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u32 pnp_bios_fault_esp;
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u32 pnp_bios_fault_eip;
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u32 pnp_bios_is_utter_crap = 0;
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static spinlock_t pnp_bios_lock;
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/*
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* Support Functions
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*/
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static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
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u16 arg4, u16 arg5, u16 arg6, u16 arg7,
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void *ts1_base, u32 ts1_size,
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void *ts2_base, u32 ts2_size)
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{
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unsigned long flags;
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u16 status;
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struct desc_struct save_desc_40;
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int cpu;
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/*
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* PnP BIOSes are generally not terribly re-entrant.
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* Also, don't rely on them to save everything correctly.
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*/
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if(pnp_bios_is_utter_crap)
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return PNP_FUNCTION_NOT_SUPPORTED;
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cpu = get_cpu();
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save_desc_40 = per_cpu(cpu_gdt_table,cpu)[0x40 / 8];
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per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = bad_bios_desc;
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/* On some boxes IRQ's during PnP BIOS calls are deadly. */
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spin_lock_irqsave(&pnp_bios_lock, flags);
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/* The lock prevents us bouncing CPU here */
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if (ts1_size)
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Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
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if (ts2_size)
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Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
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__asm__ __volatile__(
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"pushl %%ebp\n\t"
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"pushl %%edi\n\t"
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"pushl %%esi\n\t"
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"pushl %%ds\n\t"
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"pushl %%es\n\t"
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"pushl %%fs\n\t"
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"pushl %%gs\n\t"
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"pushfl\n\t"
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"movl %%esp, pnp_bios_fault_esp\n\t"
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"movl $1f, pnp_bios_fault_eip\n\t"
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"lcall %5,%6\n\t"
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"1:popfl\n\t"
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"popl %%gs\n\t"
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"popl %%fs\n\t"
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"popl %%es\n\t"
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"popl %%ds\n\t"
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"popl %%esi\n\t"
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"popl %%edi\n\t"
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"popl %%ebp\n\t"
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: "=a" (status)
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: "0" ((func) | (((u32)arg1) << 16)),
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"b" ((arg2) | (((u32)arg3) << 16)),
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"c" ((arg4) | (((u32)arg5) << 16)),
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"d" ((arg6) | (((u32)arg7) << 16)),
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"i" (PNP_CS32),
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"i" (0)
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: "memory"
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);
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spin_unlock_irqrestore(&pnp_bios_lock, flags);
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per_cpu(cpu_gdt_table,cpu)[0x40 / 8] = save_desc_40;
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put_cpu();
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/* If we get here and this is set then the PnP BIOS faulted on us. */
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if(pnp_bios_is_utter_crap)
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{
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printk(KERN_ERR "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
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printk(KERN_ERR "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
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printk(KERN_ERR "PnPBIOS: Check with your vendor for an updated BIOS\n");
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}
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return status;
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}
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void pnpbios_print_status(const char * module, u16 status)
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{
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switch(status) {
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case PNP_SUCCESS:
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printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
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break;
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case PNP_NOT_SET_STATICALLY:
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printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", module);
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break;
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case PNP_UNKNOWN_FUNCTION:
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printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", module);
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break;
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case PNP_FUNCTION_NOT_SUPPORTED:
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printk(KERN_ERR "PnPBIOS: %s: function not supported on this system\n", module);
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break;
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case PNP_INVALID_HANDLE:
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printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
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break;
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case PNP_BAD_PARAMETER:
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printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", module);
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break;
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case PNP_SET_FAILED:
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printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", module);
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break;
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case PNP_EVENTS_NOT_PENDING:
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printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
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break;
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case PNP_SYSTEM_NOT_DOCKED:
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printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", module);
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break;
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case PNP_NO_ISA_PNP_CARDS:
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printk(KERN_ERR "PnPBIOS: %s: no isapnp cards are installed on this system\n", module);
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break;
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case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
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printk(KERN_ERR "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", module);
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break;
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case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
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printk(KERN_ERR "PnPBIOS: %s: unable to undock, the system does not have a battery\n", module);
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break;
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case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
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printk(KERN_ERR "PnPBIOS: %s: could not dock due to resource conflicts\n", module);
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break;
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case PNP_BUFFER_TOO_SMALL:
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printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", module);
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break;
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case PNP_USE_ESCD_SUPPORT:
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printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
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break;
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case PNP_MESSAGE_NOT_SUPPORTED:
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printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", module);
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break;
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case PNP_HARDWARE_ERROR:
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printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n", module);
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break;
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default:
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printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, status);
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break;
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}
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}
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/*
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* PnP BIOS Low Level Calls
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*/
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#define PNP_GET_NUM_SYS_DEV_NODES 0x00
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#define PNP_GET_SYS_DEV_NODE 0x01
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#define PNP_SET_SYS_DEV_NODE 0x02
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#define PNP_GET_EVENT 0x03
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#define PNP_SEND_MESSAGE 0x04
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#define PNP_GET_DOCKING_STATION_INFORMATION 0x05
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#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
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#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
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#define PNP_GET_APM_ID_TABLE 0x0b
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#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
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#define PNP_GET_ESCD_INFO 0x41
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#define PNP_READ_ESCD 0x42
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#define PNP_WRITE_ESCD 0x43
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/*
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* Call PnP BIOS with function 0x00, "get number of system device nodes"
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*/
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static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1, PNP_DS, 0, 0,
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data, sizeof(struct pnp_dev_node_info), NULL, 0);
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data->no_nodes &= 0xff;
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return status;
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}
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int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
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{
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int status = __pnp_bios_dev_node_info( data );
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if ( status )
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pnpbios_print_status( "dev_node_info", status );
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return status;
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}
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/*
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* Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
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* death if they are asked to access the "current" configuration.
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* Therefore, if it's a matter of indifference, it's better to call
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* get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
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*/
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/*
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* Call PnP BIOS with function 0x01, "get system device node"
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* Input: *nodenum = desired node,
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* boot = whether to get nonvolatile boot (!=0)
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* or volatile current (0) config
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* Output: *nodenum=next node or 0xff if no more nodes
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*/
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static int __pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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if ( !boot && pnpbios_dont_use_current_config )
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, boot ? 2 : 1, PNP_DS, 0,
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nodenum, sizeof(char), data, 65536);
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return status;
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}
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int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
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{
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int status;
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status = __pnp_bios_get_dev_node( nodenum, boot, data );
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if ( status )
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pnpbios_print_status( "get_dev_node", status );
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return status;
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}
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/*
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* Call PnP BIOS with function 0x02, "set system device node"
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* Input: *nodenum = desired node,
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* boot = whether to set nonvolatile boot (!=0)
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* or volatile current (0) config
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*/
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static int __pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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if ( !boot && pnpbios_dont_use_current_config )
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, boot ? 2 : 1, PNP_DS, 0, 0,
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data, 65536, NULL, 0);
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return status;
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}
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int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
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{
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int status;
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status = __pnp_bios_set_dev_node( nodenum, boot, data );
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if ( status ) {
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pnpbios_print_status( "set_dev_node", status );
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return status;
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}
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if ( !boot ) { /* Update devlist */
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status = pnp_bios_get_dev_node( &nodenum, boot, data );
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if ( status )
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return status;
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}
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return status;
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}
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#if needed
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/*
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* Call PnP BIOS with function 0x03, "get event"
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*/
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static int pnp_bios_get_event(u16 *event)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0 ,0 ,0,
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event, sizeof(u16), NULL, 0);
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return status;
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}
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#endif
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#if needed
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/*
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* Call PnP BIOS with function 0x04, "send message"
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*/
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static int pnp_bios_send_message(u16 message)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0, 0, 0, 0);
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return status;
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}
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#endif
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/*
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* Call PnP BIOS with function 0x05, "get docking station information"
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*/
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int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
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data, sizeof(struct pnp_docking_station_info), NULL, 0);
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return status;
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}
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#if needed
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/*
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* Call PnP BIOS with function 0x09, "set statically allocated resource
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* information"
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*/
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static int pnp_bios_set_stat_res(char *info)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
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info, *((u16 *) info), 0, 0);
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return status;
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}
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#endif
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/*
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* Call PnP BIOS with function 0x0a, "get statically allocated resource
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* information"
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*/
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static int __pnp_bios_get_stat_res(char *info)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
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info, 65536, NULL, 0);
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return status;
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}
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int pnp_bios_get_stat_res(char *info)
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{
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int status;
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status = __pnp_bios_get_stat_res( info );
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if ( status )
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pnpbios_print_status( "get_stat_res", status );
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return status;
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}
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#if needed
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/*
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* Call PnP BIOS with function 0x0b, "get APM id table"
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*/
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static int pnp_bios_apm_id_table(char *table, u16 *size)
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{
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u16 status;
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if (!pnp_bios_present())
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return PNP_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS, 0, 0,
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table, *size, size, sizeof(u16));
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return status;
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}
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#endif
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/*
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* Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
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*/
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static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
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{
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u16 status;
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if (!pnp_bios_present())
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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);
|
|
}
|
|
}
|