x86: qemu: split qfw command interface and qfw core

This patch splits qfw command interface and qfw core function into two
files, and introduces a new Kconfig option (CONFIG_QFW) for qfw core.

Now when qfw command interface is enabled, it will automatically select
qfw core. This patch also makes the ACPI table generation select
CONFIG_QFW.

Signed-off-by: Miao Yan <yanmiaobest@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 181 insertions, 0 deletions

diff --git a/cmd/qfw.c b/cmd/qfw.c
new file mode 100644
index 0000000000..37f1aa6fc7
--- /dev/null
+++ b/cmd/qfw.c
@@ -0,0 +1,181 @@
+/*
+ * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <qemu_fw_cfg.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 (setenv("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 = getenv("loadaddr");
+	load_addr = env ?
+		(void *)simple_strtoul(env, NULL, 16) :
+		(void *)CONFIG_LOADADDR;
+
+	env = getenv("ramdiskaddr");
+	initrd_addr = env ?
+		(void *)simple_strtoul(env, NULL, 16) :
+		(void *)CONFIG_RAMDISK_ADDR;
+
+	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);
+	}
+
+	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"
+)