arch/x86/lib/bootm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2002
   4  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   5  * Marius Groeger <mgroeger@sysgo.de>
   6  *
   7  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
   8  */
   9
  10 #include <common.h>
  11 #include <bootstage.h>
  12 #include <command.h>
  13 #include <hang.h>
  14 #include <log.h>
  15 #include <asm/global_data.h>
  16 #include <dm/device.h>
  17 #include <dm/root.h>
  18 #include <errno.h>
  19 #include <fdt_support.h>
  20 #include <image.h>
  21 #include <u-boot/zlib.h>
  22 #include <asm/bootparam.h>
  23 #include <asm/cpu.h>
  24 #include <asm/byteorder.h>
  25 #include <asm/zimage.h>
  26 #ifdef CONFIG_SYS_COREBOOT
  27 #include <asm/arch/timestamp.h>
  28 #endif
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 #define COMMAND_LINE_OFFSET 0x9000
  33
  34 void bootm_announce_and_cleanup(void)
  35 {
  36         printf("\nStarting kernel ...\n\n");
  37
  38 #ifdef CONFIG_SYS_COREBOOT
  39         timestamp_add_now(TS_U_BOOT_START_KERNEL);
  40 #endif
  41         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  42 #if CONFIG_IS_ENABLED(BOOTSTAGE_REPORT)
  43         bootstage_report();
  44 #endif
  45
  46         /*
  47          * Call remove function of all devices with a removal flag set.
  48          * This may be useful for last-stage operations, like cancelling
  49          * of DMA operation or releasing device internal buffers.
  50          */
  51         dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
  52 }
  53
  54 #if defined(CONFIG_OF_LIBFDT) && !defined(CONFIG_OF_NO_KERNEL)
  55 int arch_fixup_memory_node(void *blob)
  56 {
  57         struct bd_info  *bd = gd->bd;
  58         int bank;
  59         u64 start[CONFIG_NR_DRAM_BANKS];
  60         u64 size[CONFIG_NR_DRAM_BANKS];
  61
  62         for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
  63                 start[bank] = bd->bi_dram[bank].start;
  64                 size[bank] = bd->bi_dram[bank].size;
  65         }
  66
  67         return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);
  68 }
  69 #endif
  70
  71 /* Subcommand: PREP */
  72 static int boot_prep_linux(bootm_headers_t *images)
  73 {
  74         char *cmd_line_dest = NULL;
  75         image_header_t *hdr;
  76         int is_zimage = 0;
  77         void *data = NULL;
  78         size_t len;
  79         int ret;
  80
  81 #ifdef CONFIG_OF_LIBFDT
  82         if (images->ft_len) {
  83                 debug("using: FDT\n");
  84                 if (image_setup_linux(images)) {
  85                         puts("FDT creation failed! hanging...");
  86                         hang();
  87                 }
  88         }
  89 #endif
  90         if (images->legacy_hdr_valid) {
  91                 hdr = images->legacy_hdr_os;
  92                 if (image_check_type(hdr, IH_TYPE_MULTI)) {
  93                         ulong os_data, os_len;
  94
  95                         /* if multi-part image, we need to get first subimage */
  96                         image_multi_getimg(hdr, 0, &os_data, &os_len);
  97                         data = (void *)os_data;
  98                         len = os_len;
  99                 } else {
 100                         /* otherwise get image data */
 101                         data = (void *)image_get_data(hdr);
 102                         len = image_get_data_size(hdr);
 103                 }
 104                 is_zimage = 1;
 105 #if defined(CONFIG_FIT)
 106         } else if (images->fit_uname_os && is_zimage) {
 107                 ret = fit_image_get_data(images->fit_hdr_os,
 108                                 images->fit_noffset_os,
 109                                 (const void **)&data, &len);
 110                 if (ret) {
 111                         puts("Can't get image data/size!\n");
 112                         goto error;
 113                 }
 114                 is_zimage = 1;
 115 #endif
 116         }
 117
 118         if (is_zimage) {
 119                 ulong load_address;
 120                 char *base_ptr;
 121
 122                 base_ptr = (char *)load_zimage(data, len, &load_address);
 123                 if (!base_ptr) {
 124                         puts("## Kernel loading failed ...\n");
 125                         goto error;
 126                 }
 127                 images->os.load = load_address;
 128                 cmd_line_dest = base_ptr + COMMAND_LINE_OFFSET;
 129                 images->ep = (ulong)base_ptr;
 130         } else if (images->ep) {
 131                 cmd_line_dest = (void *)images->ep + COMMAND_LINE_OFFSET;
 132         } else {
 133                 printf("## Kernel loading failed (missing x86 kernel setup) ...\n");
 134                 goto error;
 135         }
 136
 137         printf("Setup at %#08lx\n", images->ep);
 138         ret = setup_zimage((void *)images->ep, cmd_line_dest,
 139                         0, images->rd_start,
 140                         images->rd_end - images->rd_start, 0);
 141
 142         if (ret) {
 143                 printf("## Setting up boot parameters failed ...\n");
 144                 return 1;
 145         }
 146
 147         return 0;
 148
 149 error:
 150         return 1;
 151 }
 152
 153 int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit)
 154 {
 155         bootm_announce_and_cleanup();
 156
 157 #ifdef CONFIG_SYS_COREBOOT
 158         timestamp_add_now(TS_U_BOOT_START_KERNEL);
 159 #endif
 160         if (image_64bit) {
 161                 if (!cpu_has_64bit()) {
 162                         puts("Cannot boot 64-bit kernel on 32-bit machine\n");
 163                         return -EFAULT;
 164                 }
 165                 /* At present 64-bit U-Boot does not support booting a
 166                  * kernel.
 167                  * TODO(sjg@chromium.org): Support booting both 32-bit and
 168                  * 64-bit kernels from 64-bit U-Boot.
 169                  */
 170 #if !CONFIG_IS_ENABLED(X86_64)
 171                 return cpu_jump_to_64bit(setup_base, load_address);
 172 #endif
 173         } else {
 174                 /*
 175                 * Set %ebx, %ebp, and %edi to 0, %esi to point to the
 176                 * boot_params structure, and then jump to the kernel. We
 177                 * assume that %cs is 0x10, 4GB flat, and read/execute, and
 178                 * the data segments are 0x18, 4GB flat, and read/write.
 179                 * U-Boot is setting them up that way for itself in
 180                 * arch/i386/cpu/cpu.c.
 181                 *
 182                 * Note that we cannot currently boot a kernel while running as
 183                 * an EFI application. Please use the payload option for that.
 184                 */
 185 #ifndef CONFIG_EFI_APP
 186                 __asm__ __volatile__ (
 187                 "movl $0, %%ebp\n"
 188                 "cli\n"
 189                 "jmp *%[kernel_entry]\n"
 190                 :: [kernel_entry]"a"(load_address),
 191                 [boot_params] "S"(setup_base),
 192                 "b"(0), "D"(0)
 193                 );
 194 #endif
 195         }
 196
 197         /* We can't get to here */
 198         return -EFAULT;
 199 }
 200
 201 /* Subcommand: GO */
 202 static int boot_jump_linux(bootm_headers_t *images)
 203 {
 204         debug("## Transferring control to Linux (at address %08lx, kernel %08lx) ...\n",
 205               images->ep, images->os.load);
 206
 207         return boot_linux_kernel(images->ep, images->os.load,
 208                                  images->os.arch == IH_ARCH_X86_64);
 209 }
 210
 211 int do_bootm_linux(int flag, int argc, char *const argv[],
 212                    bootm_headers_t *images)
 213 {
 214         /* No need for those on x86 */
 215         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 216                 return -1;
 217
 218         if (flag & BOOTM_STATE_OS_PREP)
 219                 return boot_prep_linux(images);
 220
 221         if (flag & BOOTM_STATE_OS_GO)
 222                 return boot_jump_linux(images);
 223
 224         return boot_jump_linux(images);
 225 }