cmd/qfw.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2015 Miao Yan <[email protected]>
   4  */
   5
   6 #include <common.h>
   7 #include <command.h>
   8 #include <env.h>
   9 #include <errno.h>
  10 #include <qfw.h>
  11 #include <dm.h>
  12
  13 static struct udevice *qfw_dev;
  14
  15 /*
  16  * This function prepares kernel for zboot. It loads kernel data
  17  * to 'load_addr', initrd to 'initrd_addr' and kernel command
  18  * line using qemu fw_cfg interface.
  19  */
  20 static int qemu_fwcfg_cmd_setup_kernel(void *load_addr, void *initrd_addr)
  21 {
  22         char *data_addr;
  23         uint32_t setup_size, kernel_size, cmdline_size, initrd_size;
  24
  25         qfw_read_entry(qfw_dev, FW_CFG_SETUP_SIZE, 4, &setup_size);
  26         qfw_read_entry(qfw_dev, FW_CFG_KERNEL_SIZE, 4, &kernel_size);
  27
  28         if (kernel_size == 0) {
  29                 printf("fatal: no kernel available\n");
  30                 return CMD_RET_FAILURE;
  31         }
  32
  33         data_addr = load_addr;
  34         if (setup_size != 0) {
  35                 qfw_read_entry(qfw_dev, FW_CFG_SETUP_DATA,
  36                                le32_to_cpu(setup_size), data_addr);
  37                 data_addr += le32_to_cpu(setup_size);
  38         }
  39
  40         qfw_read_entry(qfw_dev, FW_CFG_KERNEL_DATA,
  41                        le32_to_cpu(kernel_size), data_addr);
  42         data_addr += le32_to_cpu(kernel_size);
  43         env_set_hex("filesize", le32_to_cpu(kernel_size));
  44
  45         data_addr = initrd_addr;
  46         qfw_read_entry(qfw_dev, FW_CFG_INITRD_SIZE, 4, &initrd_size);
  47         if (initrd_size == 0) {
  48                 printf("warning: no initrd available\n");
  49         } else {
  50                 qfw_read_entry(qfw_dev, FW_CFG_INITRD_DATA,
  51                                le32_to_cpu(initrd_size), data_addr);
  52                 data_addr += le32_to_cpu(initrd_size);
  53                 env_set_hex("filesize", le32_to_cpu(initrd_size));
  54         }
  55
  56         qfw_read_entry(qfw_dev, FW_CFG_CMDLINE_SIZE, 4, &cmdline_size);
  57         if (cmdline_size) {
  58                 qfw_read_entry(qfw_dev, FW_CFG_CMDLINE_DATA,
  59                                le32_to_cpu(cmdline_size), data_addr);
  60                 /*
  61                  * if kernel cmdline only contains '\0', (e.g. no -append
  62                  * when invoking qemu), do not update bootargs
  63                  */
  64                 if (*data_addr != '\0') {
  65                         if (env_set("bootargs", data_addr) < 0)
  66                                 printf("warning: unable to change bootargs\n");
  67                 }
  68         }
  69
  70         printf("loading kernel to address %p size %x", load_addr,
  71                le32_to_cpu(kernel_size));
  72         if (initrd_size)
  73                 printf(" initrd %p size %x\n",
  74                        initrd_addr,
  75                        le32_to_cpu(initrd_size));
  76         else
  77                 printf("\n");
  78
  79         return 0;
  80 }
  81
  82 static int qemu_fwcfg_cmd_list_firmware(void)
  83 {
  84         int ret;
  85         struct fw_cfg_file_iter iter;
  86         struct fw_file *file;
  87
  88         /* make sure fw_list is loaded */
  89         ret = qfw_read_firmware_list(qfw_dev);
  90         if (ret)
  91                 return ret;
  92
  93         for (file = qfw_file_iter_init(qfw_dev, &iter);
  94              !qfw_file_iter_end(&iter);
  95              file = qfw_file_iter_next(&iter)) {
  96                 printf("%-56s\n", file->cfg.name);
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int qemu_fwcfg_do_list(struct cmd_tbl *cmdtp, int flag,
 103                               int argc, char *const argv[])
 104 {
 105         if (qemu_fwcfg_cmd_list_firmware() < 0)
 106                 return CMD_RET_FAILURE;
 107
 108         return 0;
 109 }
 110
 111 static int qemu_fwcfg_do_cpus(struct cmd_tbl *cmdtp, int flag,
 112                               int argc, char *const argv[])
 113 {
 114         printf("%d cpu(s) online\n", qfw_online_cpus(qfw_dev));
 115         return 0;
 116 }
 117
 118 static int qemu_fwcfg_do_load(struct cmd_tbl *cmdtp, int flag,
 119                               int argc, char *const argv[])
 120 {
 121         char *env;
 122         void *load_addr;
 123         void *initrd_addr;
 124
 125         env = env_get("loadaddr");
 126         load_addr = env ?
 127                 (void *)hextoul(env, NULL) :
 128                 (void *)CONFIG_SYS_LOAD_ADDR;
 129
 130         env = env_get("ramdiskaddr");
 131         initrd_addr = env ?
 132                 (void *)hextoul(env, NULL) :
 133 #ifdef CFG_RAMDISK_ADDR
 134                 (void *)CFG_RAMDISK_ADDR;
 135 #else
 136                 NULL;
 137 #endif
 138
 139         if (argc == 2) {
 140                 load_addr = (void *)hextoul(argv[0], NULL);
 141                 initrd_addr = (void *)hextoul(argv[1], NULL);
 142         } else if (argc == 1) {
 143                 load_addr = (void *)hextoul(argv[0], NULL);
 144         }
 145
 146         if (!load_addr || !initrd_addr) {
 147                 printf("missing load or initrd address\n");
 148                 return CMD_RET_FAILURE;
 149         }
 150
 151         return qemu_fwcfg_cmd_setup_kernel(load_addr, initrd_addr);
 152 }
 153
 154 static struct cmd_tbl fwcfg_commands[] = {
 155         U_BOOT_CMD_MKENT(list, 0, 1, qemu_fwcfg_do_list, "", ""),
 156         U_BOOT_CMD_MKENT(cpus, 0, 1, qemu_fwcfg_do_cpus, "", ""),
 157         U_BOOT_CMD_MKENT(load, 2, 1, qemu_fwcfg_do_load, "", ""),
 158 };
 159
 160 static int do_qemu_fw(struct cmd_tbl *cmdtp, int flag, int argc,
 161                       char *const argv[])
 162 {
 163         int ret;
 164         struct cmd_tbl *fwcfg_cmd;
 165
 166         ret = qfw_get_dev(&qfw_dev);
 167         if (ret) {
 168                 printf("QEMU fw_cfg interface not found\n");
 169                 return CMD_RET_USAGE;
 170         }
 171
 172         fwcfg_cmd = find_cmd_tbl(argv[1], fwcfg_commands,
 173                                  ARRAY_SIZE(fwcfg_commands));
 174         argc -= 2;
 175         argv += 2;
 176         if (!fwcfg_cmd || argc > fwcfg_cmd->maxargs)
 177                 return CMD_RET_USAGE;
 178
 179         ret = fwcfg_cmd->cmd(fwcfg_cmd, flag, argc, argv);
 180
 181         return cmd_process_error(fwcfg_cmd, ret);
 182 }
 183
 184 U_BOOT_CMD(
 185         qfw,    4,      1,      do_qemu_fw,
 186         "QEMU firmware interface",
 187         "<command>\n"
 188         "    - list                             : print firmware(s) currently loaded\n"
 189         "    - cpus                             : print online cpu number\n"
 190         "    - load <kernel addr> <initrd addr> : load kernel and initrd (if any), and setup for zboot\n"
 191 )