text: /*
   * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  static ulong get_sp(void)
  {
  	ulong ret;
  
  	asm("mov %0, sp" : "=r"(ret) : );
  	return ret;
  }
  
  void arch_lmb_reserve(struct lmb *lmb)
  {
  	ulong sp;
  
  	/*
  	 * Booting a (Linux) kernel image
  	 *
  	 * Allocate space for command line and board info - the
  	 * address should be as high as possible within the reach of
  	 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  	 * memory, which means far enough below the current stack
  	 * pointer.
  	 */
  	sp = get_sp();
  	debug("## Current stack ends at 0x%08lx ", sp);
  
  	/* adjust sp by 4K to be safe */
  	sp -= 4096;
  	lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  }
  
  static int cleanup_before_linux(void)
  {
  	disable_interrupts();
  	flush_dcache_all();
  	invalidate_icache_all();
  
  	return 0;
  }
  
  /* Subcommand: PREP */
  static void boot_prep_linux(bootm_headers_t *images)
  {
  	if (image_setup_linux(images))
  		hang();
  }
  
  /* Subcommand: GO */
  static void boot_jump_linux(bootm_headers_t *images, int flag)
  {
  	void (*kernel_entry)(int zero, int arch, uint params);
  	unsigned int r0, r2;
  	int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  
  	kernel_entry = (void (*)(int, int, uint))images->ep;
  
  	debug("## Transferring control to Linux (at address %08lx)...\n",
  	      (ulong) kernel_entry);
  	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  
  	printf("\nStarting kernel ...%s\n\n", fake ?
  	       "(fake run for tracing)" : "");
  	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  
  	cleanup_before_linux();
  
  	if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
  		r0 = 2;
  		r2 = (unsigned int)images->ft_addr;
  	} else {
  		r0 = 1;
  		r2 = (unsigned int)getenv("bootargs");
  	}
  
  	if (!fake)
  		kernel_entry(r0, 0, r2);
  }
  
  int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  {
  	/* No need for those on ARC */
  	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;
  }
  