213 lines
5.2 KiB
ArmAsm
213 lines
5.2 KiB
ArmAsm
/*
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* APM (Advanced Power Management) BIOS Device Driver
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*
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* Copyright (c) 1994-1995 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
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*
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* This software may be used, modified, copied, and distributed, in
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* both source and binary form provided that the above copyright and
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* these terms are retained. Under no circumstances is the author
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* responsible for the proper functioning of this software, nor does
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* the author assume any responsibility for damages incurred with its
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* use.
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*
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* Sep., 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
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*
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* $Id: apm_init.S,v 1.6 1996/03/12 21:23:56 nate Exp $
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*/
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/*
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* If you want to know the specification of APM BIOS, see the following
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* documentations,
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*
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* [1] Intel Corporation and Microsoft Corporation, "Advanced Power
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* Management, The Next Generation, Version 1.0", Feb.,1992.
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*
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* [2] Intel Corporation and Microsoft Corporation, "Advanced Power
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* Management (APM) BIOS Interface Specification Revision 1.1",
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* Sep.,1993, Intel Order Number: 241704-001, Microsoft Part
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* Number: 781-110-X01
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*
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* or contact
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*
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* APM Support Desk (Intel Corporation, US)
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* TEL: (800)628-8686
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* FAX: (916)356-6100.
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*/
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.file "apm_init.S"
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#define ASM
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#include "real_prot.h"
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#include "apm_bios.h"
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#include "apm_segments.h"
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/*
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* APM BIOS initializer
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*
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* Return value:
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* %eax 0xffffffff Can't find APM BIOS
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* 0xfffffffe Don't support 32bit connection
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* 0xfffffffd Connection error
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* otherwise APM version (16bit BCD format)
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* %ebx APM cs entry offset (32bit)
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* %ecx lower 16bit APM 16bit cs base (real mode segment)
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* upper 16bit APM 32bit cs base (real mode segment)
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* %edx lower 16bit APM ds limit (real mode segment)
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* upper 16bit [Reserved]
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* %esi lower 16bit APM cs limit (APM 1.1 or later)
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* upper 16bit APM ds limit (APM 1.1 or later)
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* %edi bit0 = 1 16bit protected mode interface supported
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* bit1 = 1 32bit protected mode interface supported
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* bit2 = 1 "CPU idle" call slows processor clock speed
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* bit3 = 1 APM BIOS Power Management disabled
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* bit4 = 1 APM BIOS Power Management disengaged
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*/
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.text
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ENTRY(apm_init)
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cli /* disable interrupt */
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pushl %ebp /* save original base pointer */
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/* ebp is used as a register variable */
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/*
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* save old data segments: We assume that %ds == %es && %ds == %ss
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*/
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pushl %fs
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movw %ds, %ax
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movw %ax, %fs
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movw $(APM_INIT_DS_SEL), %ax /* initializer data segment */
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movl %esp, old_esp /* save original stack pointer */
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movl $0x10000, %esp /* setup temporary stack */
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/* (note that it isn't 0x00000000) */
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sidt EXT(Idtr_prot) /* save current IDT */
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call EXT(prot_to_real) /* return to real mode */
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/*
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* APM installation check
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*/
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movb $(APM_BIOS), %ah
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movb $(APM_INSTCHECK), %al
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data32
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movl $(PMDV_APMBIOS), %ebx
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sti
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int $(SYSTEM_BIOS) /* call system BIOS */
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cli
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jnc 1f /* if found, goto 1f */
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data32
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call EXT(real_to_prot) /* come back again to protected mode */
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movl $(APMINI_CANTFIND), apm_version
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/* can't find APM BIOS */
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jmp finish
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1:
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movl %eax, %edx /* actually, movw %ax, %dx */
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/* save the value of %ax */
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data32
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call EXT(real_to_prot) /* come back again to protected mode */
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cmpw $0x504d, %bx /* "PM" signature? */
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jz 1f
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movl $(APMINI_CANTFIND), apm_version
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/* can't find APM BIOS */
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jmp finish
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1:
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testl $(APM_32BIT_SUPPORT), %ecx
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/* supports 32bit connection? */
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jnz 1f
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movl $(APMINI_NOT32BIT), apm_version
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/* don't support 32bit connection */
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jmp finish
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1:
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andl $0x0000ffff, %edx
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movl %edx, apm_version
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andl $0x0000ffff, %ecx
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movl %ecx, apm_flags
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/*
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* APM Protected Mode 32-bit Interface Connect
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*/
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call EXT(prot_to_real) /* return to real mode */
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/* Disconnect, just in case */
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movb $(APM_BIOS), %ah
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movb $(APM_DISCONNECT), %al
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data32
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movl $(PMDV_APMBIOS), %ebx
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sti
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int $(SYSTEM_BIOS)
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cli
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/* Ignore return code, but we can now connect safely */
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movb $(APM_BIOS), %ah
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movb $(APM_PROT32CONNECT), %al
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data32
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movl $(PMDV_APMBIOS), %ebx
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sti
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int $(SYSTEM_BIOS)
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cli
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jnc 1f /* if successed, go to 1f */
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data32
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call EXT(real_to_prot)
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movl $(APMINI_CONNECTERR), apm_version
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/* connection error */
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jmp finish
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1:
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/* save PM 32bit code segment into %bp */
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movl %eax, %ebp /* actually, movw %ax, %bp */
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data32
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call EXT(real_to_prot)
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movl $0x0000ffff, %eax
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andl %eax, %ebp /* 32bit cs base */
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andl %eax, %ecx /* 16bit cs base */
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andl %eax, %edx /* ds base */
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andl %eax, %esi /* cs length (APM 1.1 or later) */
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andl %eax, %edi /* ds length (APM 1.1 or later) */
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/* %ebx is code offset */
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/* pack 32bit cs and 16bit cs into %ecx */
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shll $16, %ebp
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orl %ebp, %ecx
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/* pack cs length and ds length into %esi */
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shll $16, %edi
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orl %edi, %esi
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finish:
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cli
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lidt EXT(Idtr_prot) /* restore old IDTR */
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movl old_esp, %esp /* restore old stack pointer */
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movl apm_version, %ebp /* stored to %eax later */
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movl apm_flags, %edi
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movw %fs, %ax
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movw %ax, %ss
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movw %ax, %es
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movw %ax, %ds
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movl %ebp, %eax
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popl %fs
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popl %ebp /* restore old base pointer */
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lret /* restore old code segment */
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.data
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.globl EXT(ouraddr)
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LEXT(ouraddr)
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.long APM_OURADDR
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old_esp:
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.long 0
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apm_version:
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.long 0
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apm_flags:
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.long 0
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old_ds:
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.word 0
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old_es:
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.word 0
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old_ss:
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.word 0
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