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