sm501: Add missing arbitration control register
[qemu.git] / hw / pci-host / pam.c
1 /*
2 * QEMU Smram/pam logic implementation
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.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 "qemu/osdep.h"
31 #include "qom/object.h"
32 #include "sysemu/sysemu.h"
33 #include "hw/pci-host/pam.h"
34
35 void init_pam(DeviceState *dev, MemoryRegion *ram_memory,
36 MemoryRegion *system_memory, MemoryRegion *pci_address_space,
37 PAMMemoryRegion *mem, uint32_t start, uint32_t size)
38 {
39 int i;
40
41 /* RAM */
42 memory_region_init_alias(&mem->alias[3], OBJECT(dev), "pam-ram", ram_memory,
43 start, size);
44 /* ROM (XXX: not quite correct) */
45 memory_region_init_alias(&mem->alias[1], OBJECT(dev), "pam-rom", ram_memory,
46 start, size);
47 memory_region_set_readonly(&mem->alias[1], true);
48
49 /* XXX: should distinguish read/write cases */
50 memory_region_init_alias(&mem->alias[0], OBJECT(dev), "pam-pci", pci_address_space,
51 start, size);
52 memory_region_init_alias(&mem->alias[2], OBJECT(dev), "pam-pci", ram_memory,
53 start, size);
54
55 for (i = 0; i < 4; ++i) {
56 memory_region_set_enabled(&mem->alias[i], false);
57 memory_region_add_subregion_overlap(system_memory, start,
58 &mem->alias[i], 1);
59 }
60 mem->current = 0;
61 }
62
63 void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
64 {
65 assert(0 <= idx && idx <= 12);
66
67 memory_region_set_enabled(&pam->alias[pam->current], false);
68 pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK;
69 memory_region_set_enabled(&pam->alias[pam->current], true);
70 }