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/* $OpenBSD: apmprobe.c,v 1.5 1998/04/18 07:39:40 deraadt Exp $ */
/*
* Copyright (c) 1997 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Michael Shalayeff.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* APM derived from: apm_init.S, LP (Laptop Package)
* wich contained this:
* Copyright (C) 1994 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
*
*/
/*
* If you want to know the specification of APM BIOS, see the following
* documentations,
*
* [1] Intel Corporation and Microsoft Corporation, "Advanced Power
* Management, The Next Generation, Version 1.0", Feb.,1992.
*
* [2] Intel Corporation and Microsoft Corporation, "Advanced Power
* Management (APM) BIOS Interface Specification Revision 1.1",
* Sep.,1993, Intel Order Number: 241704-001, Microsoft Part
* Number: 781-110-X01
*
* or contact
*
* APM Support Desk (Intel Corporation, US)
* TEL: (800)628-8686
* FAX: (916)356-6100.
*/
#include "libsa.h"
#include <stand/boot/bootarg.h>
#include <machine/apmvar.h>
#include <machine/biosvar.h>
#include "debug.h"
extern int debug;
static __inline u_int
apm_check()
{
register u_int detail;
register u_int8_t f;
__asm __volatile(DOINT(0x15) "\n\t"
"setc %b1\n\t"
"movzwl %%ax, %0\n\t"
"shll $16, %%ecx\n\t"
"orl %%ecx, %0"
: "=a" (detail), "=b" (f)
: "0" (APM_INSTCHECK), "1" (APM_DEV_APM_BIOS)
: "%ecx", "cc");
if (f || BIOS_regs.biosr_bx != 0x504d /* "PM" */ ) {
#ifdef DEBUG
if (debug)
printf("apm_check: %x, %x, %x\n",
f, BIOS_regs.biosr_bx, detail);
#endif
return 0;
} else
return detail;
}
static __inline int
apm_disconnect()
{
register u_int16_t rv;
__asm __volatile(DOINT(0x15) "\n\t"
"setc %b0"
: "=a" (rv)
: "0" (APM_DISCONNECT), "b" (APM_DEV_APM_BIOS)
: "%ecx", "%edx", "cc");
return (rv & 0xff)? rv >> 8 : 0;
}
static __inline int
apm_connect(ai)
bios_apminfo_t *ai;
{
register u_int16_t f;
__asm __volatile (DOINT(0x15) "\n\t"
"setc %b1\n\t"
"movb %%ah, %h1\n\t"
"movzwl %%ax, %%eax\n\tshll $4, %0\n\t"
"movzwl %%cx, %%ecx\n\tshll $4, %2\n\t"
"movzwl %%dx, %%edx\n\tshll $4, %3\n\t"
: "=a" (ai->apm_code32_base),
"=b" (f),
"=c" (ai->apm_code16_base),
"=d" (ai->apm_data_base)
: "0" (APM_PROT32_CONNECT), "1" (APM_DEV_APM_BIOS)
: "cc");
ai->apm_entry = BIOS_regs.biosr_bx;
#if 0
ai->apm_code_len = BIOS_regs.biosr_si & 0xffff;
ai->apm_data_len = BIOS_regs.biosr_di & 0xffff;
#else
ai->apm_code_len = 0x10000;
ai->apm_data_len = 0x10000;
#endif
return (f & 0xff)? f >> 8 : 0;
}
void
apmprobe()
{
bios_apminfo_t ai;
if ((ai.apm_detail = apm_check())) {
apm_disconnect();
if (apm_connect(&ai) != 0)
printf(": connect error\n");
#ifdef DEBUG
if (debug)
printf(": %x text=%x/%x[%x] data=%x[%x] @ %x",
ai.apm_detail, ai.apm_code32_base,
ai.apm_code16_base, ai.apm_code_len,
ai.apm_data_base, ai.apm_data_len,
ai.apm_entry);
else
printf(" apm");
#else
printf(" apm");
#endif
addbootarg(BOOTARG_APMINFO, sizeof(ai), &ai);
}
}
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