u-boot/arch/mips/lib/bootm_qemu_mips.c

/*
 * (C) Copyright 2008
 * Jean-Christophe PLAGNIOL-VILLARD <jcplagniol@jcrosoft.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>

DECLARE_GLOBAL_DATA_PTR;

int do_bootm_linux(int flag, int argc, char * const argv[],
			bootm_headers_t *images)
{
	void (*theKernel) (int, char **, char **, int *);
	char *bootargs = getenv("bootargs");
	char *start;
	uint len;

	/* find kernel entry point */
	theKernel = (void (*)(int, char **, char **, int *))images->ep;

	bootstage_mark(BOOTSTAGE_ID_RUN_OS);

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

	gd->bd->bi_boot_params = gd->bd->bi_memstart + (16 << 20) - 256;
	debug("%-12s= 0x%08lX\n", "boot_params", (ulong)gd->bd->bi_boot_params);

	/* set Magic */
	*(int32_t *)(gd->bd->bi_boot_params - 4) = 0x12345678;
	/* set ram_size */
	*(int32_t *)(gd->bd->bi_boot_params - 8) = gd->ram_size;

	start = (char *)gd->bd->bi_boot_params;

	len = strlen(bootargs);

	strncpy(start, bootargs, len + 1);

	start += len;

	len = images->rd_end - images->rd_start;
	if (len > 0) {
		start += sprintf(start, " rd_start=0x%08X rd_size=0x%0X",
		(uint) UNCACHED_SDRAM(images->rd_start),
		(uint) len);
	}

	/* we assume that the kernel is in place */
	printf("\nStarting kernel ...\n\n");

	theKernel(0, NULL, NULL, 0);

	/* does not return */
	return 1;
}