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