88 lines
3.3 KiB
C
88 lines
3.3 KiB
C
/*
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* QEMU i440FX/PIIX3 PCI Bridge Emulation
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*
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* Copyright (c) 2006 Fabrice Bellard
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* Copyright (c) 2011 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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* Copyright (c) 2012 Jason Baron <jbaron@redhat.com>
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*
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* Split out from piix_pci.c
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "sysemu/sysemu.h"
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#include "pam.h"
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void smram_update(MemoryRegion *smram_region, uint8_t smram,
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uint8_t smm_enabled)
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{
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bool smram_enabled;
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smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) ||
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(smram & SMRAM_D_OPEN));
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memory_region_set_enabled(smram_region, !smram_enabled);
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}
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void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram,
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MemoryRegion *smram_region)
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{
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uint8_t smm_enabled = (smm != 0);
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if (*host_smm_enabled != smm_enabled) {
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*host_smm_enabled = smm_enabled;
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smram_update(smram_region, smram, *host_smm_enabled);
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}
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}
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void init_pam(MemoryRegion *ram_memory, MemoryRegion *system_memory,
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MemoryRegion *pci_address_space, PAMMemoryRegion *mem,
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uint32_t start, uint32_t size)
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{
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int i;
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/* RAM */
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memory_region_init_alias(&mem->alias[3], "pam-ram", ram_memory,
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start, size);
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/* ROM (XXX: not quite correct) */
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memory_region_init_alias(&mem->alias[1], "pam-rom", ram_memory,
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start, size);
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memory_region_set_readonly(&mem->alias[1], true);
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/* XXX: should distinguish read/write cases */
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memory_region_init_alias(&mem->alias[0], "pam-pci", pci_address_space,
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start, size);
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memory_region_init_alias(&mem->alias[2], "pam-pci", pci_address_space,
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start, size);
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for (i = 0; i < 4; ++i) {
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memory_region_set_enabled(&mem->alias[i], false);
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memory_region_add_subregion_overlap(system_memory, start,
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&mem->alias[i], 1);
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}
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mem->current = 0;
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}
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void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
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{
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assert(0 <= idx && idx <= 12);
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memory_region_set_enabled(&pam->alias[pam->current], false);
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pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK;
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memory_region_set_enabled(&pam->alias[pam->current], true);
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}
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