LXR uboot/arch/nios2/lib/bootm.c

   1/*
   2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
   3 * Scott McNutt <smcnutt@psyent.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9
  10#define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
  11
  12int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  13{
  14        void (*kernel)(int, int, int, char *) = (void *)images->ep;
  15        char *commandline = getenv("bootargs");
  16        ulong initrd_start = images->rd_start;
  17        ulong initrd_end = images->rd_end;
  18        char *of_flat_tree = NULL;
  19#if defined(CONFIG_OF_LIBFDT)
  20        /* did generic code already find a device tree? */
  21        if (images->ft_len)
  22                of_flat_tree = images->ft_addr;
  23#endif
  24        if (!of_flat_tree && argc > 1)
  25                of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
  26        if (of_flat_tree)
  27                initrd_end = (ulong)of_flat_tree;
  28
  29        /*
  30         * allow the PREP bootm subcommand, it is required for bootm to work
  31         */
  32        if (flag & BOOTM_STATE_OS_PREP)
  33                return 0;
  34
  35        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  36                return 1;
  37
  38        /* flushes data and instruction caches before calling the kernel */
  39        disable_interrupts();
  40        flush_dcache_all();
  41
  42        debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
  43        debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
  44        /* kernel parameters passing
  45         * r4 : NIOS magic
  46         * r5 : initrd start
  47         * r6 : initrd end or fdt
  48         * r7 : kernel command line
  49         * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
  50         * verified with fdt magic. when both initrd and fdt are used at the
  51         * same time, fdt must follow immediately after initrd.
  52         */
  53        kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
  54        /* does not return */
  55
  56        return 1;
  57}
  58