qfw.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
*/
#include <common.h>
#include <command.h>
#include <errno.h>
#include <qfw.h>
/*
* This function prepares kernel for zboot. It loads kernel data
* to 'load_addr', initrd to 'initrd_addr' and kernel command
* line using qemu fw_cfg interface.
*/
static int qemu_fwcfg_setup_kernel(void *load_addr, void *initrd_addr)
{
char *data_addr;
uint32_t setup_size, kernel_size, cmdline_size, initrd_size;
qemu_fwcfg_read_entry(FW_CFG_SETUP_SIZE, 4, &setup_size);
qemu_fwcfg_read_entry(FW_CFG_KERNEL_SIZE, 4, &kernel_size);
if (setup_size == 0 || kernel_size == 0) {
printf("warning: no kernel available\n");
return -1;
}
data_addr = load_addr;
qemu_fwcfg_read_entry(FW_CFG_SETUP_DATA,
le32_to_cpu(setup_size), data_addr);
data_addr += le32_to_cpu(setup_size);
qemu_fwcfg_read_entry(FW_CFG_KERNEL_DATA,
le32_to_cpu(kernel_size), data_addr);
data_addr += le32_to_cpu(kernel_size);
data_addr = initrd_addr;
qemu_fwcfg_read_entry(FW_CFG_INITRD_SIZE, 4, &initrd_size);
if (initrd_size == 0) {
printf("warning: no initrd available\n");
} else {
qemu_fwcfg_read_entry(FW_CFG_INITRD_DATA,
le32_to_cpu(initrd_size), data_addr);
data_addr += le32_to_cpu(initrd_size);
}
qemu_fwcfg_read_entry(FW_CFG_CMDLINE_SIZE, 4, &cmdline_size);
if (cmdline_size) {
qemu_fwcfg_read_entry(FW_CFG_CMDLINE_DATA,
le32_to_cpu(cmdline_size), data_addr);
/*
* if kernel cmdline only contains '\0', (e.g. no -append
* when invoking qemu), do not update bootargs
*/
if (*data_addr != '\0') {
if (env_set("bootargs", data_addr) < 0)
printf("warning: unable to change bootargs\n");
}
}
printf("loading kernel to address %p size %x", load_addr,
le32_to_cpu(kernel_size));
if (initrd_size)
printf(" initrd %p size %x\n",
initrd_addr,
le32_to_cpu(initrd_size));
else
printf("\n");
return 0;
}
static int qemu_fwcfg_list_firmware(void)
{
int ret;
struct fw_cfg_file_iter iter;
struct fw_file *file;
/* make sure fw_list is loaded */
ret = qemu_fwcfg_read_firmware_list();
if (ret)
return ret;
for (file = qemu_fwcfg_file_iter_init(&iter);
!qemu_fwcfg_file_iter_end(&iter);
file = qemu_fwcfg_file_iter_next(&iter)) {
printf("%-56s\n", file->cfg.name);
}
return 0;
}
static int qemu_fwcfg_do_list(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
if (qemu_fwcfg_list_firmware() < 0)
return CMD_RET_FAILURE;
return 0;
}
static int qemu_fwcfg_do_cpus(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
int ret = qemu_fwcfg_online_cpus();
if (ret < 0) {
printf("QEMU fw_cfg interface not found\n");
return CMD_RET_FAILURE;
}
printf("%d cpu(s) online\n", qemu_fwcfg_online_cpus());
return 0;
}
static int qemu_fwcfg_do_load(cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[])
{
char *env;
void *load_addr;
void *initrd_addr;
env = env_get("loadaddr");
load_addr = env ?
(void *)simple_strtoul(env, NULL, 16) :
#ifdef CONFIG_LOADADDR
(void *)CONFIG_LOADADDR;
#else
NULL;
#endif
env = env_get("ramdiskaddr");
initrd_addr = env ?
(void *)simple_strtoul(env, NULL, 16) :
#ifdef CONFIG_RAMDISK_ADDR
(void *)CONFIG_RAMDISK_ADDR;
#else
NULL;
#endif
if (argc == 2) {
load_addr = (void *)simple_strtoul(argv[0], NULL, 16);
initrd_addr = (void *)simple_strtoul(argv[1], NULL, 16);
} else if (argc == 1) {
load_addr = (void *)simple_strtoul(argv[0], NULL, 16);
}
if (!load_addr || !initrd_addr) {
printf("missing load or initrd address\n");
return CMD_RET_FAILURE;
}
return qemu_fwcfg_setup_kernel(load_addr, initrd_addr);
}
static cmd_tbl_t fwcfg_commands[] = {
U_BOOT_CMD_MKENT(list, 0, 1, qemu_fwcfg_do_list, "", ""),
U_BOOT_CMD_MKENT(cpus, 0, 1, qemu_fwcfg_do_cpus, "", ""),
U_BOOT_CMD_MKENT(load, 2, 1, qemu_fwcfg_do_load, "", ""),
};
static int do_qemu_fw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int ret;
cmd_tbl_t *fwcfg_cmd;
if (!qemu_fwcfg_present()) {
printf("QEMU fw_cfg interface not found\n");
return CMD_RET_USAGE;
}
fwcfg_cmd = find_cmd_tbl(argv[1], fwcfg_commands,
ARRAY_SIZE(fwcfg_commands));
argc -= 2;
argv += 2;
if (!fwcfg_cmd || argc > fwcfg_cmd->maxargs)
return CMD_RET_USAGE;
ret = fwcfg_cmd->cmd(fwcfg_cmd, flag, argc, argv);
return cmd_process_error(fwcfg_cmd, ret);
}
U_BOOT_CMD(
qfw, 4, 1, do_qemu_fw,
"QEMU firmware interface",
"<command>\n"
" - list : print firmware(s) currently loaded\n"
" - cpus : print online cpu number\n"
" - load <kernel addr> <initrd addr> : load kernel and initrd (if any), and setup for zboot\n"
)