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