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