1/* $OpenBSD: apmprobe.c,v 1.19 2016/06/10 18:36:06 jcs Exp $ */ 2 3/* 4 * Copyright (c) 1997-2000 Michael Shalayeff 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 26 * THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28/* 29 * APM derived from: apm_init.S, LP (Laptop Package) 30 * which contained this: 31 * Copyright (C) 1994 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp> 32 * 33 */ 34/* 35 * If you want to know the specification of APM BIOS, see the following 36 * documentations, 37 * 38 * [1] Intel Corporation and Microsoft Corporation, "Advanced Power 39 * Management, The Next Generation, Version 1.0", Feb.,1992. 40 * 41 * [2] Intel Corporation and Microsoft Corporation, "Advanced Power 42 * Management (APM) BIOS Interface Specification Revision 1.1", 43 * Sep.,1993, Intel Order Number: 241704-001, Microsoft Part 44 * Number: 781-110-X01 45 * 46 * or contact 47 * 48 * APM Support Desk (Intel Corporation, US) 49 * TEL: (800)628-8686 50 * FAX: (916)356-6100. 51 */ 52 53#include <sys/param.h> 54#include "libsa.h" 55#include <stand/boot/bootarg.h> 56 57#include <dev/isa/isareg.h> 58 59#include <machine/apmvar.h> 60#include <machine/biosvar.h> 61 62#include "debug.h" 63 64extern int debug; 65 66static __inline u_int 67apm_check(void) 68{ 69 register u_int detail; 70 register u_int8_t f; 71 72 __asm volatile(DOINT(0x15) "\n\t" 73 "setc %b1\n\t" 74 "movzwl %%ax, %0\n\t" 75 "shll $16, %%ecx\n\t" 76 "orl %%ecx, %0" 77 : "=a" (detail), "=b" (f) 78 : "0" (APM_INSTCHECK), "1" (APM_DEV_APM_BIOS) 79 : "%ecx", "cc"); 80 81 if (f || BIOS_regs.biosr_bx != 0x504d /* "PM" */ ) { 82#ifdef DEBUG 83 if (debug) 84 printf("apm_check: %x, %x, %x\n", 85 f, BIOS_regs.biosr_bx, detail); 86#endif 87 return 0; 88 } else 89 return detail; 90} 91 92static __inline int 93apm_disconnect(void) 94{ 95 register u_int16_t rv; 96 97 __asm volatile(DOINT(0x15) "\n\t" 98 "setc %b0" 99 : "=a" (rv) 100 : "0" (APM_DISCONNECT), "b" (APM_DEV_APM_BIOS) 101 : "%ecx", "%edx", "cc"); 102 103 return ((rv & 0xff)? rv >> 8 : 0); 104} 105 106static __inline int 107apm_connect(bios_apminfo_t *ai) 108{ 109 register u_int16_t f; 110 111 __asm volatile (DOINT(0x15) "\n\t" 112 "setc %b1\n\t" 113 "movb %%ah, %h1\n\t" 114 "movzwl %%ax, %%eax\n\tshll $4, %0\n\t" 115 "movzwl %%cx, %%ecx\n\tshll $4, %2\n\t" 116 "movzwl %%dx, %%edx\n\tshll $4, %3\n\t" 117 : "=a" (ai->apm_code32_base), 118 "=b" (f), 119 "=c" (ai->apm_code16_base), 120 "=d" (ai->apm_data_base) 121 : "0" (APM_PROT32_CONNECT), "1" (APM_DEV_APM_BIOS) 122 : "cc"); 123 124 if (f & 0xff) 125 return (f >> 8); 126 127 ai->apm_entry = BIOS_regs.biosr_bx; 128#if 0 129 ai->apm_code_len = BIOS_regs.biosr_si & 0xffff; 130 ai->apm_code16_len = BIOS_regs.biosr_si & 0xffff; 131 ai->apm_data_len = BIOS_regs.biosr_di & 0xffff; 132#else 133 ai->apm_code_len = 0xffff - (ai->apm_code32_base & 0xffff); 134 ai->apm_code16_len = 0xffff - (ai->apm_code16_base & 0xffff); 135 ai->apm_data_len = 0xffff - (ai->apm_data_base & 0xffff); 136#endif 137 if (ai->apm_data_base < BOOTARG_OFF) 138 ai->apm_data_len = PAGE_SIZE - (ai->apm_data_base & PAGE_MASK) - 1; 139 140#ifdef DEBUG 141 if (debug) 142 printf("cs=%x:%x/%x:%x, ds=%x:%x\n", 143 ai->apm_code32_base, ai->apm_code_len, 144 ai->apm_code16_base, ai->apm_code16_len, 145 ai->apm_data_base, ai->apm_data_len); 146#endif 147 /* inform apm bios about our driver version */ 148 __asm volatile (DOINT(0x15) "\n\t" 149 "setc %b1\n\t" 150 "movb %%ah, %h1" 151 : "=b" (f) 152 : "a" (APM_DRIVER_VERSION), 153 "0" (APM_DEV_APM_BIOS), 154 "c" (APM_VERSION) 155 : "cc"); 156 157 return 0; 158} 159 160static bios_apminfo_t ai; 161 162void 163apmprobe(void) 164{ 165 if ((ai.apm_detail = apm_check())) { 166 167 apm_disconnect(); 168 169 if (apm_connect(&ai) != 0) { 170#ifdef DEBUG 171 printf("\napm: connect error\n"); 172#endif 173 return; 174 } 175#ifdef DEBUG 176 if (debug) 177 printf("apm[%x cs=%x[%x]/%x[%x] ds=%x[%x] @ %x]", 178 ai.apm_detail, 179 ai.apm_code32_base, ai.apm_code_len, 180 ai.apm_code16_base, ai.apm_code16_len, 181 ai.apm_data_base, ai.apm_data_len, 182 ai.apm_entry); 183 else 184 printf(" apm"); 185#else 186 printf(" apm"); 187#endif 188 addbootarg(BOOTARG_APMINFO, sizeof(ai), &ai); 189 } 190} 191 192#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 193#define trunc_page(x) ((x) & ~PAGE_MASK) 194 195void 196apmfixmem(void) 197{ 198#ifdef DEBUG 199 printf("apmremove (%d)", ai.apm_detail); 200#endif 201 if (ai.apm_detail) 202 mem_delete(trunc_page(ai.apm_data_base), 203 round_page(ai.apm_data_base + ai.apm_data_len)); 204} 205