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 #include "sysemu/sysemu.h" 30 #include "hw/pci-host/pam.h" 31 32 void smram_update(MemoryRegion *smram_region, uint8_t smram, 33 uint8_t smm_enabled) 34 { 35 bool smram_enabled; 36 37 smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) || 38 (smram & SMRAM_D_OPEN)); 39 memory_region_set_enabled(smram_region, !smram_enabled); 40 } 41 42 void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram, 43 MemoryRegion *smram_region) 44 { 45 uint8_t smm_enabled = (smm != 0); 46 if (*host_smm_enabled != smm_enabled) { 47 *host_smm_enabled = smm_enabled; 48 smram_update(smram_region, smram, *host_smm_enabled); 49 } 50 } 51 52 void init_pam(MemoryRegion *ram_memory, MemoryRegion *system_memory, 53 MemoryRegion *pci_address_space, PAMMemoryRegion *mem, 54 uint32_t start, uint32_t size) 55 { 56 int i; 57 58 /* RAM */ 59 memory_region_init_alias(&mem->alias[3], "pam-ram", ram_memory, 60 start, size); 61 /* ROM (XXX: not quite correct) */ 62 memory_region_init_alias(&mem->alias[1], "pam-rom", ram_memory, 63 start, size); 64 memory_region_set_readonly(&mem->alias[1], true); 65 66 /* XXX: should distinguish read/write cases */ 67 memory_region_init_alias(&mem->alias[0], "pam-pci", pci_address_space, 68 start, size); 69 memory_region_init_alias(&mem->alias[2], "pam-pci", pci_address_space, 70 start, size); 71 72 for (i = 0; i < 4; ++i) { 73 memory_region_set_enabled(&mem->alias[i], false); 74 memory_region_add_subregion_overlap(system_memory, start, 75 &mem->alias[i], 1); 76 } 77 mem->current = 0; 78 } 79 80 void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val) 81 { 82 assert(0 <= idx && idx <= 12); 83 84 memory_region_set_enabled(&pam->alias[pam->current], false); 85 pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK; 86 memory_region_set_enabled(&pam->alias[pam->current], true); 87 } 88