492 lines
13 KiB
C
492 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bioscalls.c - the lowlevel layer of the PnPBIOS driver
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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/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/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/byteorder.h>
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#include "pnpbios.h"
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__visible struct {
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u16 offset;
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u16 segment;
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} pnp_bios_callpoint;
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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 __visible void pnp_bios_callfunc(void);
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__asm__(".text \n"
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__ALIGN_STR "\n"
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".globl pnp_bios_callfunc\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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#define Q2_SET_SEL(cpu, selname, address, size) \
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do { \
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struct desc_struct *gdt = get_cpu_gdt_rw((cpu)); \
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set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
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set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
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} while(0)
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static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
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(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
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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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__visible u32 pnp_bios_fault_esp;
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__visible u32 pnp_bios_fault_eip;
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__visible 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 = get_cpu_gdt_rw(cpu)[0x40 / 8];
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get_cpu_gdt_rw(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__("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":"=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), "i"(0)
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:"memory");
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spin_unlock_irqrestore(&pnp_bios_lock, flags);
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get_cpu_gdt_rw(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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printk(KERN_ERR
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"PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
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printk(KERN_ERR
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"PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
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printk(KERN_ERR
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"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",
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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",
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module);
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break;
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case PNP_FUNCTION_NOT_SUPPORTED:
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printk(KERN_ERR
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"PnPBIOS: %s: function not supported on this system\n",
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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",
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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",
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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",
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module);
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break;
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case PNP_NO_ISA_PNP_CARDS:
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printk(KERN_ERR
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"PnPBIOS: %s: no isapnp cards are installed on this system\n",
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module);
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break;
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case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
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printk(KERN_ERR
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"PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
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module);
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break;
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case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
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printk(KERN_ERR
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"PnPBIOS: %s: unable to undock, the system does not have a battery\n",
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module);
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break;
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case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
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printk(KERN_ERR
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"PnPBIOS: %s: could not dock due to resource conflicts\n",
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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",
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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",
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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 occurred\n",
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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,
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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,
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PNP_TS1, PNP_DS, 0, 0, data,
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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,
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struct pnp_bios_node *data)
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{
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u16 status;
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u16 tmp_nodenum;
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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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tmp_nodenum = *nodenum;
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status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2,
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boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum,
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sizeof(tmp_nodenum), data, 65536);
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*nodenum = tmp_nodenum;
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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,
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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,
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boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL,
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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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/*
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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,
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PNP_DS, 0, 0, 0, 0, data,
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sizeof(struct pnp_docking_station_info), NULL,
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0);
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return status;
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}
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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,
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PNP_DS, 0, 0, 0, 0, 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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/*
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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;
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status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS,
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0, 0, 0, 0, data,
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sizeof(struct pnp_isa_config_struc), NULL, 0);
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return status;
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}
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int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
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{
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int status;
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status = __pnp_bios_isapnp_config(data);
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if (status)
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pnpbios_print_status("isapnp_config", status);
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return status;
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}
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/*
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* Call PnP BIOS with function 0x41, "get ESCD info"
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*/
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static int __pnp_bios_escd_info(struct escd_info_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 ESCD_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4,
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PNP_TS1, PNP_DS, data,
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sizeof(struct escd_info_struc), NULL, 0);
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return status;
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}
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int pnp_bios_escd_info(struct escd_info_struc *data)
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{
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int status;
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status = __pnp_bios_escd_info(data);
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if (status)
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pnpbios_print_status("escd_info", status);
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return status;
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}
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/*
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* Call PnP BIOS function 0x42, "read ESCD"
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* nvram_base is determined by calling escd_info
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*/
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static int __pnp_bios_read_escd(char *data, u32 nvram_base)
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{
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u16 status;
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if (!pnp_bios_present())
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return ESCD_FUNCTION_NOT_SUPPORTED;
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status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0,
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0, data, 65536, __va(nvram_base), 65536);
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return status;
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}
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int pnp_bios_read_escd(char *data, u32 nvram_base)
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{
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int status;
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status = __pnp_bios_read_escd(data, nvram_base);
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if (status)
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pnpbios_print_status("read_escd", status);
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return status;
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}
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void pnpbios_calls_init(union pnp_bios_install_struct *header)
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{
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int i;
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spin_lock_init(&pnp_bios_lock);
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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_rw(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));
|
|
}
|
|
}
|