1 /*
2 * libqos fw_cfg support
3 *
4 * Copyright IBM, Corp. 2012-2013
5 * Copyright (C) 2013 Red Hat Inc.
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Markus Armbruster <armbru@redhat.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
12 * See the COPYING file in the top-level directory.
13 */
14
15 #include "qemu/osdep.h"
16 #include "fw_cfg.h"
17 #include "../libqtest.h"
18 #include "qemu/bswap.h"
19 #include "hw/nvram/fw_cfg.h"
20
qfw_cfg_select(QFWCFG * fw_cfg,uint16_t key)21 void qfw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
22 {
23 fw_cfg->select(fw_cfg, key);
24 }
25
qfw_cfg_read_data(QFWCFG * fw_cfg,void * data,size_t len)26 void qfw_cfg_read_data(QFWCFG *fw_cfg, void *data, size_t len)
27 {
28 fw_cfg->read(fw_cfg, data, len);
29 }
30
qfw_cfg_get(QFWCFG * fw_cfg,uint16_t key,void * data,size_t len)31 void qfw_cfg_get(QFWCFG *fw_cfg, uint16_t key, void *data, size_t len)
32 {
33 qfw_cfg_select(fw_cfg, key);
34 qfw_cfg_read_data(fw_cfg, data, len);
35 }
36
qfw_cfg_get_u16(QFWCFG * fw_cfg,uint16_t key)37 uint16_t qfw_cfg_get_u16(QFWCFG *fw_cfg, uint16_t key)
38 {
39 uint16_t value;
40 qfw_cfg_get(fw_cfg, key, &value, sizeof(value));
41 return le16_to_cpu(value);
42 }
43
qfw_cfg_get_u32(QFWCFG * fw_cfg,uint16_t key)44 uint32_t qfw_cfg_get_u32(QFWCFG *fw_cfg, uint16_t key)
45 {
46 uint32_t value;
47 qfw_cfg_get(fw_cfg, key, &value, sizeof(value));
48 return le32_to_cpu(value);
49 }
50
qfw_cfg_get_u64(QFWCFG * fw_cfg,uint16_t key)51 uint64_t qfw_cfg_get_u64(QFWCFG *fw_cfg, uint16_t key)
52 {
53 uint64_t value;
54 qfw_cfg_get(fw_cfg, key, &value, sizeof(value));
55 return le64_to_cpu(value);
56 }
57
mm_fw_cfg_select(QFWCFG * fw_cfg,uint16_t key)58 static void mm_fw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
59 {
60 qtest_writew(fw_cfg->qts, fw_cfg->base, key);
61 }
62
63 /*
64 * The caller need check the return value. When the return value is
65 * nonzero, it means that some bytes have been transferred.
66 *
67 * If the fw_cfg file in question is smaller than the allocated & passed-in
68 * buffer, then the buffer has been populated only in part.
69 *
70 * If the fw_cfg file in question is larger than the passed-in
71 * buffer, then the return value explains how much room would have been
72 * necessary in total. And, while the caller's buffer has been fully
73 * populated, it has received only a starting slice of the fw_cfg file.
74 */
qfw_cfg_get_file(QFWCFG * fw_cfg,const char * filename,void * data,size_t buflen)75 size_t qfw_cfg_get_file(QFWCFG *fw_cfg, const char *filename,
76 void *data, size_t buflen)
77 {
78 uint32_t count;
79 uint32_t i;
80 unsigned char *filesbuf = NULL;
81 size_t dsize;
82 FWCfgFile *pdir_entry;
83 size_t filesize = 0;
84
85 qfw_cfg_get(fw_cfg, FW_CFG_FILE_DIR, &count, sizeof(count));
86 count = be32_to_cpu(count);
87 dsize = sizeof(uint32_t) + count * sizeof(struct fw_cfg_file);
88 filesbuf = g_malloc(dsize);
89 qfw_cfg_get(fw_cfg, FW_CFG_FILE_DIR, filesbuf, dsize);
90 pdir_entry = (FWCfgFile *)(filesbuf + sizeof(uint32_t));
91 for (i = 0; i < count; ++i, ++pdir_entry) {
92 if (!strcmp(pdir_entry->name, filename)) {
93 uint32_t len = be32_to_cpu(pdir_entry->size);
94 uint16_t sel = be16_to_cpu(pdir_entry->select);
95 filesize = len;
96 if (len > buflen) {
97 len = buflen;
98 }
99 qfw_cfg_get(fw_cfg, sel, data, len);
100 break;
101 }
102 }
103 g_free(filesbuf);
104 return filesize;
105 }
106
mm_fw_cfg_read(QFWCFG * fw_cfg,void * data,size_t len)107 static void mm_fw_cfg_read(QFWCFG *fw_cfg, void *data, size_t len)
108 {
109 uint8_t *ptr = data;
110 int i;
111
112 for (i = 0; i < len; i++) {
113 ptr[i] = qtest_readb(fw_cfg->qts, fw_cfg->base + 2);
114 }
115 }
116
mm_fw_cfg_init(QTestState * qts,uint64_t base)117 QFWCFG *mm_fw_cfg_init(QTestState *qts, uint64_t base)
118 {
119 QFWCFG *fw_cfg = g_malloc0(sizeof(*fw_cfg));
120
121 fw_cfg->base = base;
122 fw_cfg->qts = qts;
123 fw_cfg->select = mm_fw_cfg_select;
124 fw_cfg->read = mm_fw_cfg_read;
125
126 return fw_cfg;
127 }
128
mm_fw_cfg_uninit(QFWCFG * fw_cfg)129 void mm_fw_cfg_uninit(QFWCFG *fw_cfg)
130 {
131 g_free(fw_cfg);
132 }
133
io_fw_cfg_select(QFWCFG * fw_cfg,uint16_t key)134 static void io_fw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
135 {
136 qtest_outw(fw_cfg->qts, fw_cfg->base, key);
137 }
138
io_fw_cfg_read(QFWCFG * fw_cfg,void * data,size_t len)139 static void io_fw_cfg_read(QFWCFG *fw_cfg, void *data, size_t len)
140 {
141 uint8_t *ptr = data;
142 int i;
143
144 for (i = 0; i < len; i++) {
145 ptr[i] = qtest_inb(fw_cfg->qts, fw_cfg->base + 1);
146 }
147 }
148
io_fw_cfg_init(QTestState * qts,uint16_t base)149 QFWCFG *io_fw_cfg_init(QTestState *qts, uint16_t base)
150 {
151 QFWCFG *fw_cfg = g_malloc0(sizeof(*fw_cfg));
152
153 fw_cfg->base = base;
154 fw_cfg->qts = qts;
155 fw_cfg->select = io_fw_cfg_select;
156 fw_cfg->read = io_fw_cfg_read;
157
158 return fw_cfg;
159 }
160
io_fw_cfg_uninit(QFWCFG * fw_cfg)161 void io_fw_cfg_uninit(QFWCFG *fw_cfg)
162 {
163 g_free(fw_cfg);
164 }
165