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