1 /* 2 * QEMU PC APM controller Emulation 3 * This is split out from acpi.c 4 * 5 * Copyright (c) 2006 Fabrice Bellard 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License version 2 as published by the Free Software Foundation. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/> 18 * 19 * Contributions after 2012-01-13 are licensed under the terms of the 20 * GNU GPL, version 2 or (at your option) any later version. 21 */ 22 23 #include "apm.h" 24 #include "hw.h" 25 26 //#define DEBUG 27 28 #ifdef DEBUG 29 # define APM_DPRINTF(format, ...) printf(format, ## __VA_ARGS__) 30 #else 31 # define APM_DPRINTF(format, ...) do { } while (0) 32 #endif 33 34 /* fixed I/O location */ 35 #define APM_CNT_IOPORT 0xb2 36 #define APM_STS_IOPORT 0xb3 37 38 static void apm_ioport_writeb(void *opaque, uint32_t addr, uint32_t val) 39 { 40 APMState *apm = opaque; 41 addr &= 1; 42 APM_DPRINTF("apm_ioport_writeb addr=0x%x val=0x%02x\n", addr, val); 43 if (addr == 0) { 44 apm->apmc = val; 45 46 if (apm->callback) { 47 (apm->callback)(val, apm->arg); 48 } 49 } else { 50 apm->apms = val; 51 } 52 } 53 54 static uint32_t apm_ioport_readb(void *opaque, uint32_t addr) 55 { 56 APMState *apm = opaque; 57 uint32_t val; 58 59 addr &= 1; 60 if (addr == 0) { 61 val = apm->apmc; 62 } else { 63 val = apm->apms; 64 } 65 APM_DPRINTF("apm_ioport_readb addr=0x%x val=0x%02x\n", addr, val); 66 return val; 67 } 68 69 const VMStateDescription vmstate_apm = { 70 .name = "APM State", 71 .version_id = 1, 72 .minimum_version_id = 1, 73 .minimum_version_id_old = 1, 74 .fields = (VMStateField[]) { 75 VMSTATE_UINT8(apmc, APMState), 76 VMSTATE_UINT8(apms, APMState), 77 VMSTATE_END_OF_LIST() 78 } 79 }; 80 81 void apm_init(APMState *apm, apm_ctrl_changed_t callback, void *arg) 82 { 83 apm->callback = callback; 84 apm->arg = arg; 85 86 /* ioport 0xb2, 0xb3 */ 87 register_ioport_write(APM_CNT_IOPORT, 2, 1, apm_ioport_writeb, apm); 88 register_ioport_read(APM_CNT_IOPORT, 2, 1, apm_ioport_readb, apm); 89 } 90