tests/libqos/fw_cfg.c

   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 "libqos/fw_cfg.h"
  17 #include "libqtest.h"
  18 #include "qemu/bswap.h"
  19 #include "hw/nvram/fw_cfg.h"
  20
  21 void qfw_cfg_select(QFWCFG *fw_cfg, uint16_t key)
  22 {
  23     fw_cfg->select(fw_cfg, key);
  24 }
  25
  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
  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
  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
  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
  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
  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  */
  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
 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
 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
 129 void mm_fw_cfg_uninit(QFWCFG *fw_cfg)
 130 {
 131     g_free(fw_cfg);
 132 }
 133
 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
 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
 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
 161 void io_fw_cfg_uninit(QFWCFG *fw_cfg)
 162 {
 163     g_free(fw_cfg);
 164 }