u-boot/arch/riscv/lib/bootm.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2011 Andes Technology Corporation
 * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
 * Rick Chen, Andes Technology Corporation <rick@andestech.com>
 */

#include <common.h>
#include <command.h>
#include <dm.h>
#include <dm/root.h>
#include <image.h>
#include <asm/byteorder.h>
#include <asm/csr.h>
#include <dm/device.h>
#include <dm/root.h>
#include <u-boot/zlib.h>

DECLARE_GLOBAL_DATA_PTR;

__weak void board_quiesce_devices(void)
{
}

int arch_fixup_fdt(void *blob)
{
	return 0;
}

/**
 * announce_and_cleanup() - Print message and prepare for kernel boot
 *
 * @fake: non-zero to do everything except actually boot
 */
static void announce_and_cleanup(int fake)
{
	printf("\nStarting kernel ...%s\n\n", fake ?
		"(fake run for tracing)" : "");
	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
#ifdef CONFIG_BOOTSTAGE_FDT
	bootstage_fdt_add_report();
#endif
#ifdef CONFIG_BOOTSTAGE_REPORT
	bootstage_report();
#endif

#ifdef CONFIG_USB_DEVICE
	udc_disconnect();
#endif

	board_quiesce_devices();

	/*
	 * Call remove function of all devices with a removal flag set.
	 * This may be useful for last-stage operations, like cancelling
	 * of DMA operation or releasing device internal buffers.
	 */
	dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);

	cleanup_before_linux();
}

static void boot_prep_linux(bootm_headers_t *images)
{
	if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
#ifdef CONFIG_OF_LIBFDT
		debug("using: FDT\n");
		if (image_setup_linux(images)) {
			printf("FDT creation failed! hanging...");
			hang();
		}
#endif
	} else {
		printf("Device tree not found or missing FDT support\n");
		hang();
	}
}

static void boot_jump_linux(bootm_headers_t *images, int flag)
{
	void (*kernel)(ulong hart, void *dtb);
	int fake = (flag & BOOTM_STATE_OS_FAKE_GO);

	kernel = (void (*)(ulong, void *))images->ep;

	bootstage_mark(BOOTSTAGE_ID_RUN_OS);

	debug("## Transferring control to Linux (at address %08lx) ...\n",
	      (ulong)kernel);

	announce_and_cleanup(fake);

	if (!fake) {
		if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
			kernel(csr_read(mhartid), images->ft_addr);
	}
}

int do_bootm_linux(int flag, int argc, char * const argv[],
		   bootm_headers_t *images)
{
	/* No need for those on RISC-V */
	if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
		return -1;

	if (flag & BOOTM_STATE_OS_PREP) {
		boot_prep_linux(images);
		return 0;
	}

	if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
		boot_jump_linux(images, flag);
		return 0;
	}

	boot_prep_linux(images);
	boot_jump_linux(images, flag);
	return 0;
}