arch/microblaze/lib/bootm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2007 Michal Simek
   4  * (C) Copyright 2004 Atmark Techno, Inc.
   5  *
   6  * Michal  SIMEK <monstr@monstr.eu>
   7  * Yasushi SHOJI <yashi@atmark-techno.com>
   8  */
   9
  10 #include <common.h>
  11 #include <bootstage.h>
  12 #include <command.h>
  13 #include <cpu_func.h>
  14 #include <env.h>
  15 #include <fdt_support.h>
  16 #include <hang.h>
  17 #include <image.h>
  18 #include <lmb.h>
  19 #include <log.h>
  20 #include <asm/cache.h>
  21 #include <u-boot/zlib.h>
  22 #include <asm/byteorder.h>
  23
  24 DECLARE_GLOBAL_DATA_PTR;
  25
  26 static ulong get_sp(void)
  27 {
  28         ulong ret;
  29
  30         asm("addik %0, r1, 0" : "=r"(ret) : );
  31         return ret;
  32 }
  33
  34 void arch_lmb_reserve(struct lmb *lmb)
  35 {
  36         ulong sp, bank_end;
  37         int bank;
  38
  39         /*
  40          * Booting a (Linux) kernel image
  41          *
  42          * Allocate space for command line and board info - the
  43          * address should be as high as possible within the reach of
  44          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  45          * memory, which means far enough below the current stack
  46          * pointer.
  47          */
  48         sp = get_sp();
  49         debug("## Current stack ends at 0x%08lx ", sp);
  50
  51         /* adjust sp by 4K to be safe */
  52         sp -= 4096;
  53         for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  54                 if (sp < gd->bd->bi_dram[bank].start)
  55                         continue;
  56                 bank_end = gd->bd->bi_dram[bank].start +
  57                         gd->bd->bi_dram[bank].size;
  58                 if (sp >= bank_end)
  59                         continue;
  60                 lmb_reserve(lmb, sp, bank_end - sp);
  61                 break;
  62         }
  63 }
  64
  65 static void boot_jump_linux(bootm_headers_t *images, int flag)
  66 {
  67         void (*thekernel)(char *cmdline, ulong rd, ulong dt);
  68         ulong dt = (ulong)images->ft_addr;
  69         ulong rd_start = images->initrd_start;
  70         ulong cmdline = images->cmdline_start;
  71         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  72
  73         thekernel = (void (*)(char *, ulong, ulong))images->ep;
  74
  75         debug("## Transferring control to Linux (at address 0x%08lx) ",
  76               (ulong)thekernel);
  77         debug("cmdline 0x%08lx, ramdisk 0x%08lx, FDT 0x%08lx...\n",
  78               cmdline, rd_start, dt);
  79         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  80
  81         printf("\nStarting kernel ...%s\n\n", fake ?
  82                "(fake run for tracing)" : "");
  83         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  84
  85 #ifdef XILINX_USE_DCACHE
  86         flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
  87 #endif
  88
  89         if (!fake) {
  90                 /*
  91                  * Linux Kernel Parameters (passing device tree):
  92                  * r5: pointer to command line
  93                  * r6: pointer to ramdisk
  94                  * r7: pointer to the fdt, followed by the board info data
  95                  */
  96                 thekernel((char *)cmdline, rd_start, dt);
  97                 /* does not return */
  98         }
  99 }
 100
 101 static void boot_prep_linux(bootm_headers_t *images)
 102 {
 103         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 104                 debug("using: FDT\n");
 105                 if (image_setup_linux(images)) {
 106                         printf("FDT creation failed! hanging...");
 107                         hang();
 108                 }
 109         }
 110 }
 111
 112 int do_bootm_linux(int flag, int argc, char *const argv[],
 113                    bootm_headers_t *images)
 114 {
 115         images->cmdline_start = (ulong)env_get("bootargs");
 116
 117         /* cmdline init is the part of 'prep' and nothing to do for 'bdt' */
 118         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 119                 return -1;
 120
 121         if (flag & BOOTM_STATE_OS_PREP) {
 122                 boot_prep_linux(images);
 123                 return 0;
 124         }
 125
 126         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 127                 boot_jump_linux(images, flag);
 128                 return 0;
 129         }
 130
 131         boot_prep_linux(images);
 132         boot_jump_linux(images, flag);
 133         return 1;
 134 }