1 /* 2 * QEMU i440FX/PIIX3 PCI Bridge Emulation 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_pci.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 "qom/object.h" 31 #include "sysemu/sysemu.h" 32 #include "hw/pci-host/pam.h" 33 34 void smram_update(MemoryRegion *smram_region, uint8_t smram, 35 uint8_t smm_enabled) 36 { 37 bool smram_enabled; 38 39 smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) || 40 (smram & SMRAM_D_OPEN)); 41 memory_region_set_enabled(smram_region, !smram_enabled); 42 } 43 44 void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram, 45 MemoryRegion *smram_region) 46 { 47 uint8_t smm_enabled = (smm != 0); 48 if (*host_smm_enabled != smm_enabled) { 49 *host_smm_enabled = smm_enabled; 50 smram_update(smram_region, smram, *host_smm_enabled); 51 } 52 } 53 54 void init_pam(DeviceState *dev, MemoryRegion *ram_memory, 55 MemoryRegion *system_memory, MemoryRegion *pci_address_space, 56 PAMMemoryRegion *mem, uint32_t start, uint32_t size) 57 { 58 int i; 59 60 /* RAM */ 61 memory_region_init_alias(&mem->alias[3], OBJECT(dev), "pam-ram", ram_memory, 62 start, size); 63 /* ROM (XXX: not quite correct) */ 64 memory_region_init_alias(&mem->alias[1], OBJECT(dev), "pam-rom", ram_memory, 65 start, size); 66 memory_region_set_readonly(&mem->alias[1], true); 67 68 /* XXX: should distinguish read/write cases */ 69 memory_region_init_alias(&mem->alias[0], OBJECT(dev), "pam-pci", pci_address_space, 70 start, size); 71 memory_region_init_alias(&mem->alias[2], OBJECT(dev), "pam-pci", ram_memory, 72 start, size); 73 74 for (i = 0; i < 4; ++i) { 75 memory_region_set_enabled(&mem->alias[i], false); 76 memory_region_add_subregion_overlap(system_memory, start, 77 &mem->alias[i], 1); 78 } 79 mem->current = 0; 80 } 81 82 void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val) 83 { 84 assert(0 <= idx && idx <= 12); 85 86 memory_region_set_enabled(&pam->alias[pam->current], false); 87 pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK; 88 memory_region_set_enabled(&pam->alias[pam->current], true); 89 } 90