pam: partly fix write-only mode
[qemu/ar7.git] / hw / pci-host / pam.c
blobe1e95aabcd7967c228bdefc3eab6d4c880112fd9
1 /*
2 * QEMU i440FX/PIIX3 PCI Bridge Emulation
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>
9 * Split out from piix_pci.c
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:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
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.
30 #include "qom/object.h"
31 #include "sysemu/sysemu.h"
32 #include "hw/pci-host/pam.h"
34 void smram_update(MemoryRegion *smram_region, uint8_t smram,
35 uint8_t smm_enabled)
37 bool smram_enabled;
39 smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) ||
40 (smram & SMRAM_D_OPEN));
41 memory_region_set_enabled(smram_region, !smram_enabled);
44 void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram,
45 MemoryRegion *smram_region)
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);
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)
58 int i;
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);
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);
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);
79 mem->current = 0;
82 void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
84 assert(0 <= idx && idx <= 12);
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);