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

   1/*
   2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6
   7#include <common.h>
   8
   9DECLARE_GLOBAL_DATA_PTR;
  10
  11static ulong get_sp(void)
  12{
  13        ulong ret;
  14
  15        asm("mov %0, sp" : "=r"(ret) : );
  16        return ret;
  17}
  18
  19void arch_lmb_reserve(struct lmb *lmb)
  20{
  21        ulong sp;
  22
  23        /*
  24         * Booting a (Linux) kernel image
  25         *
  26         * Allocate space for command line and board info - the
  27         * address should be as high as possible within the reach of
  28         * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  29         * memory, which means far enough below the current stack
  30         * pointer.
  31         */
  32        sp = get_sp();
  33        debug("## Current stack ends at 0x%08lx ", sp);
  34
  35        /* adjust sp by 4K to be safe */
  36        sp -= 4096;
  37        lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  38}
  39
  40static int cleanup_before_linux(void)
  41{
  42        disable_interrupts();
  43        flush_dcache_all();
  44        invalidate_icache_all();
  45
  46        return 0;
  47}
  48
  49/* Subcommand: PREP */
  50static void boot_prep_linux(bootm_headers_t *images)
  51{
  52        if (image_setup_linux(images))
  53                hang();
  54}
  55
  56/* Subcommand: GO */
  57static void boot_jump_linux(bootm_headers_t *images, int flag)
  58{
  59        void (*kernel_entry)(int zero, int arch, uint params);
  60        unsigned int r0, r2;
  61        int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  62
  63        kernel_entry = (void (*)(int, int, uint))images->ep;
  64
  65        debug("## Transferring control to Linux (at address %08lx)...\n",
  66              (ulong) kernel_entry);
  67        bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  68
  69        printf("\nStarting kernel ...%s\n\n", fake ?
  70               "(fake run for tracing)" : "");
  71        bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  72
  73        cleanup_before_linux();
  74
  75        if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
  76                r0 = 2;
  77                r2 = (unsigned int)images->ft_addr;
  78        } else {
  79                r0 = 1;
  80                r2 = (unsigned int)getenv("bootargs");
  81        }
  82
  83        if (!fake)
  84                kernel_entry(r0, 0, r2);
  85}
  86
  87int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  88{
  89        /* No need for those on ARC */
  90        if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
  91                return -1;
  92
  93        if (flag & BOOTM_STATE_OS_PREP) {
  94                boot_prep_linux(images);
  95                return 0;
  96        }
  97
  98        if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
  99                boot_jump_linux(images, flag);
 100                return 0;
 101        }
 102
 103        boot_prep_linux(images);
 104        boot_jump_linux(images, flag);
 105        return 0;
 106}
 107