From 410edd922d2a90c79cd92b086c0e53650ea52c02 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Wed, 14 Nov 2012 15:54:02 -0500 Subject: pc/piix_pci: factor out smram/pam logic Factor out smram/pam logic for use by other chipsets, namely q35 at this point. Note: Should be factored out into a generic North Bridge Class. [jbaron@redhat.com: changes for updated memory API] Signed-off-by: Isaku Yamahata Signed-off-by: Jason Baron Signed-off-by: Anthony Liguori --- hw/pam.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 hw/pam.c (limited to 'hw/pam.c') diff --git a/hw/pam.c b/hw/pam.c new file mode 100644 index 0000000..a95e2cf --- /dev/null +++ b/hw/pam.c @@ -0,0 +1,87 @@ +/* + * QEMU i440FX/PIIX3 PCI Bridge Emulation + * + * Copyright (c) 2006 Fabrice Bellard + * Copyright (c) 2011 Isaku Yamahata + * VA Linux Systems Japan K.K. + * Copyright (c) 2012 Jason Baron + * + * Split out from piix_pci.c + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "sysemu.h" +#include "pam.h" + +void smram_update(MemoryRegion *smram_region, uint8_t smram, + uint8_t smm_enabled) +{ + bool smram_enabled; + + smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) || + (smram & SMRAM_D_OPEN)); + memory_region_set_enabled(smram_region, !smram_enabled); +} + +void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram, + MemoryRegion *smram_region) +{ + uint8_t smm_enabled = (smm != 0); + if (*host_smm_enabled != smm_enabled) { + *host_smm_enabled = smm_enabled; + smram_update(smram_region, smram, *host_smm_enabled); + } +} + +void init_pam(MemoryRegion *ram_memory, MemoryRegion *system_memory, + MemoryRegion *pci_address_space, PAMMemoryRegion *mem, + uint32_t start, uint32_t size) +{ + int i; + + /* RAM */ + memory_region_init_alias(&mem->alias[3], "pam-ram", ram_memory, + start, size); + /* ROM (XXX: not quite correct) */ + memory_region_init_alias(&mem->alias[1], "pam-rom", ram_memory, + start, size); + memory_region_set_readonly(&mem->alias[1], true); + + /* XXX: should distinguish read/write cases */ + memory_region_init_alias(&mem->alias[0], "pam-pci", pci_address_space, + start, size); + memory_region_init_alias(&mem->alias[2], "pam-pci", pci_address_space, + start, size); + + for (i = 0; i < 4; ++i) { + memory_region_set_enabled(&mem->alias[i], false); + memory_region_add_subregion_overlap(system_memory, start, + &mem->alias[i], 1); + } + mem->current = 0; +} + +void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val) +{ + assert(0 <= idx && idx <= 12); + + memory_region_set_enabled(&pam->alias[pam->current], false); + pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK; + memory_region_set_enabled(&pam->alias[pam->current], true); +} -- cgit v1.1