pam.c (2927B)
1 /* 2 * QEMU Smram/pam logic implementation 3 * 4 * Copyright (c) 2006 Fabrice Bellard 5 * Copyright (c) 2011 Isaku Yamahata <yamahata at valinux co jp> 6 * VA Linux Systems Japan K.K. 7 * Copyright (c) 2012 Jason Baron <jbaron@redhat.com> 8 * 9 * Split out from piix.c 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a copy 12 * of this software and associated documentation files (the "Software"), to deal 13 * in the Software without restriction, including without limitation the rights 14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 15 * copies of the Software, and to permit persons to whom the Software is 16 * furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice shall be included in 19 * all copies or substantial portions of the Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 27 * THE SOFTWARE. 28 */ 29 30 #include "qemu/osdep.h" 31 #include "hw/pci-host/pam.h" 32 33 void init_pam(DeviceState *dev, MemoryRegion *ram_memory, 34 MemoryRegion *system_memory, MemoryRegion *pci_address_space, 35 PAMMemoryRegion *mem, uint32_t start, uint32_t size) 36 { 37 int i; 38 39 /* RAM */ 40 memory_region_init_alias(&mem->alias[3], OBJECT(dev), "pam-ram", ram_memory, 41 start, size); 42 /* ROM (XXX: not quite correct) */ 43 memory_region_init_alias(&mem->alias[1], OBJECT(dev), "pam-rom", ram_memory, 44 start, size); 45 memory_region_set_readonly(&mem->alias[1], true); 46 47 /* XXX: should distinguish read/write cases */ 48 memory_region_init_alias(&mem->alias[0], OBJECT(dev), "pam-pci", pci_address_space, 49 start, size); 50 memory_region_init_alias(&mem->alias[2], OBJECT(dev), "pam-pci", ram_memory, 51 start, size); 52 53 memory_region_transaction_begin(); 54 for (i = 0; i < 4; ++i) { 55 memory_region_set_enabled(&mem->alias[i], false); 56 memory_region_add_subregion_overlap(system_memory, start, 57 &mem->alias[i], 1); 58 } 59 memory_region_transaction_commit(); 60 mem->current = 0; 61 } 62 63 void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val) 64 { 65 assert(0 <= idx && idx < PAM_REGIONS_COUNT); 66 67 memory_region_set_enabled(&pam->alias[pam->current], false); 68 pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK; 69 memory_region_set_enabled(&pam->alias[pam->current], true); 70 }