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