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

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
   4 */
   5
   6#include <asm/cache.h>
   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        sync_n_cleanup_cache_all();
  44
  45        return 0;
  46}
  47
  48__weak int board_prep_linux(bootm_headers_t *images) { return 0; }
  49
  50/* Subcommand: PREP */
  51static int boot_prep_linux(bootm_headers_t *images)
  52{
  53        int ret;
  54
  55        ret = image_setup_linux(images);
  56        if (ret)
  57                return ret;
  58
  59        return board_prep_linux(images);
  60}
  61
  62/* Generic implementation for single core CPU */
  63__weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
  64{
  65        void (*kernel_entry)(int zero, int arch, uint params);
  66
  67        kernel_entry = (void (*)(int, int, uint))entry;
  68
  69        kernel_entry(zero, arch, params);
  70}
  71
  72/* Subcommand: GO */
  73static void boot_jump_linux(bootm_headers_t *images, int flag)
  74{
  75        ulong kernel_entry;
  76        unsigned int r0, r2;
  77        int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  78
  79        kernel_entry = images->ep;
  80
  81        debug("## Transferring control to Linux (at address %08lx)...\n",
  82              kernel_entry);
  83        bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  84
  85        printf("\nStarting kernel ...%s\n\n", fake ?
  86               "(fake run for tracing)" : "");
  87        bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  88
  89        if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
  90                r0 = 2;
  91                r2 = (unsigned int)images->ft_addr;
  92        } else {
  93                r0 = 1;
  94                r2 = (unsigned int)env_get("bootargs");
  95        }
  96
  97        cleanup_before_linux();
  98
  99        if (!fake)
 100                board_jump_and_run(kernel_entry, r0, 0, r2);
 101}
 102
 103int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 104{
 105        /* No need for those on ARC */
 106        if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
 107                return -1;
 108
 109        if (flag & BOOTM_STATE_OS_PREP)
 110                return boot_prep_linux(images);
 111
 112        if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 113                boot_jump_linux(images, flag);
 114                return 0;
 115        }
 116
 117        return -1;
 118}
 119