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 <asm/global_data.h>
  22 #include <u-boot/zlib.h>
  23 #include <asm/byteorder.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 static ulong get_sp(void)
  28 {
  29         ulong ret;
  30
  31         asm("addik %0, r1, 0" : "=r"(ret) : );
  32         return ret;
  33 }
  34
  35 void arch_lmb_reserve(struct lmb *lmb)
  36 {
  37         arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
  38 }
  39
  40 static void boot_jump_linux(bootm_headers_t *images, int flag)
  41 {
  42         void (*thekernel)(char *cmdline, ulong rd, ulong dt);
  43         ulong dt = (ulong)images->ft_addr;
  44         ulong rd_start = images->initrd_start;
  45         ulong cmdline = images->cmdline_start;
  46         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  47
  48         thekernel = (void (*)(char *, ulong, ulong))images->ep;
  49
  50         debug("## Transferring control to Linux (at address 0x%08lx) ",
  51               (ulong)thekernel);
  52         debug("cmdline 0x%08lx, ramdisk 0x%08lx, FDT 0x%08lx...\n",
  53               cmdline, rd_start, dt);
  54         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  55
  56         printf("\nStarting kernel ...%s\n\n", fake ?
  57                "(fake run for tracing)" : "");
  58         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  59
  60 #ifdef XILINX_USE_DCACHE
  61         flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
  62 #endif
  63
  64         if (!fake) {
  65                 /*
  66                  * Linux Kernel Parameters (passing device tree):
  67                  * r5: pointer to command line
  68                  * r6: pointer to ramdisk
  69                  * r7: pointer to the fdt, followed by the board info data
  70                  */
  71                 thekernel((char *)cmdline, rd_start, dt);
  72                 /* does not return */
  73         }
  74 }
  75
  76 static void boot_prep_linux(bootm_headers_t *images)
  77 {
  78         if (CONFIG_IS_ENABLED(OF_LIBFDT) && images->ft_len) {
  79                 debug("using: FDT\n");
  80                 if (image_setup_linux(images)) {
  81                         printf("FDT creation failed! hanging...");
  82                         hang();
  83                 }
  84         }
  85 }
  86
  87 int do_bootm_linux(int flag, int argc, char *const argv[],
  88                    bootm_headers_t *images)
  89 {
  90         images->cmdline_start = (ulong)env_get("bootargs");
  91
  92         /* cmdline init is the part of 'prep' and nothing to do for 'bdt' */
  93         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
  94                 return -1;
  95
  96         if (flag & BOOTM_STATE_OS_PREP) {
  97                 boot_prep_linux(images);
  98                 return 0;
  99         }
 100
 101         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 102                 boot_jump_linux(images, flag);
 103                 return 0;
 104         }
 105
 106         boot_prep_linux(images);
 107         boot_jump_linux(images, flag);
 108         return 1;
 109 }