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
   9 DECLARE_GLOBAL_DATA_PTR;
  10
  11 static ulong get_sp(void)
  12 {
  13         ulong ret;
  14
  15         asm("mov %0, sp" : "=r"(ret) : );
  16         return ret;
  17 }
  18
  19 void 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
  40 static 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 */
  51 static 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 */
  73 static 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
 103 int 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 }