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