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 "hw/pci-host/pam.h" |
33 | |
34 | void init_pam(DeviceState *dev, MemoryRegion *ram_memory, |
35 | MemoryRegion *system_memory, MemoryRegion *pci_address_space, |
36 | PAMMemoryRegion *mem, uint32_t start, uint32_t size) |
37 | { |
38 | int i; |
39 | |
40 | /* RAM */ |
41 | memory_region_init_alias(&mem->alias[3], OBJECT(dev), "pam-ram" , ram_memory, |
42 | start, size); |
43 | /* ROM (XXX: not quite correct) */ |
44 | memory_region_init_alias(&mem->alias[1], OBJECT(dev), "pam-rom" , ram_memory, |
45 | start, size); |
46 | memory_region_set_readonly(&mem->alias[1], true); |
47 | |
48 | /* XXX: should distinguish read/write cases */ |
49 | memory_region_init_alias(&mem->alias[0], OBJECT(dev), "pam-pci" , pci_address_space, |
50 | start, size); |
51 | memory_region_init_alias(&mem->alias[2], OBJECT(dev), "pam-pci" , ram_memory, |
52 | start, size); |
53 | |
54 | memory_region_transaction_begin(); |
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 | memory_region_transaction_commit(); |
61 | mem->current = 0; |
62 | } |
63 | |
64 | void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val) |
65 | { |
66 | assert(0 <= idx && idx <= 12); |
67 | |
68 | memory_region_set_enabled(&pam->alias[pam->current], false); |
69 | pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK; |
70 | memory_region_set_enabled(&pam->alias[pam->current], true); |
71 | } |
72 | |