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_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         if (CONFIG_IS_ENABLED(OF_LIBFDT) && CONFIG_IS_ENABLED(LMB) && images->ft_len) {
  82                 debug("using: FDT\n");
  83                 if (image_setup_linux(images)) {
  84                         puts("FDT creation failed! hanging...");
  85                         hang();
  86                 }
  87         }
  88
  89         if (images->legacy_hdr_valid) {
  90                 hdr = images->legacy_hdr_os;
  91                 if (image_check_type(hdr, IH_TYPE_MULTI)) {
  92                         ulong os_data, os_len;
  93
  94                         /* if multi-part image, we need to get first subimage */
  95                         image_multi_getimg(hdr, 0, &os_data, &os_len);
  96                         data = (void *)os_data;
  97                         len = os_len;
  98                 } else {
  99                         /* otherwise get image data */
 100                         data = (void *)image_get_data(hdr);
 101                         len = image_get_data_size(hdr);
 102                 }
 103                 is_zimage = 1;
 104 #if defined(CONFIG_FIT)
 105         } else if (images->fit_uname_os && is_zimage) {
 106                 ret = fit_image_get_data(images->fit_hdr_os,
 107                                 images->fit_noffset_os,
 108                                 (const void **)&data, &len);
 109                 if (ret) {
 110                         puts("Can't get image data/size!\n");
 111                         goto error;
 112                 }
 113                 is_zimage = 1;
 114 #endif
 115         }
 116
 117         if (is_zimage) {
 118                 ulong load_address;
 119                 char *base_ptr;
 120
 121                 base_ptr = (char *)load_zimage(data, len, &load_address);
 122                 if (!base_ptr) {
 123                         puts("## Kernel loading failed ...\n");
 124                         goto error;
 125                 }
 126                 images->os.load = load_address;
 127                 cmd_line_dest = base_ptr + COMMAND_LINE_OFFSET;
 128                 images->ep = (ulong)base_ptr;
 129         } else if (images->ep) {
 130                 cmd_line_dest = (void *)images->ep + COMMAND_LINE_OFFSET;
 131         } else {
 132                 printf("## Kernel loading failed (missing x86 kernel setup) ...\n");
 133                 goto error;
 134         }
 135
 136         printf("Setup at %#08lx\n", images->ep);
 137         ret = setup_zimage((void *)images->ep, cmd_line_dest,
 138                         0, images->rd_start,
 139                         images->rd_end - images->rd_start, 0);
 140
 141         if (ret) {
 142                 printf("## Setting up boot parameters failed ...\n");
 143                 return 1;
 144         }
 145
 146         return 0;
 147
 148 error:
 149         return 1;
 150 }
 151
 152 int boot_linux_kernel(ulong setup_base, ulong load_address, bool image_64bit)
 153 {
 154         bootm_announce_and_cleanup();
 155
 156 #ifdef CONFIG_SYS_COREBOOT
 157         timestamp_add_now(TS_U_BOOT_START_KERNEL);
 158 #endif
 159         if (image_64bit) {
 160                 if (!cpu_has_64bit()) {
 161                         puts("Cannot boot 64-bit kernel on 32-bit machine\n");
 162                         return -EFAULT;
 163                 }
 164                 /* At present 64-bit U-Boot does not support booting a
 165                  * kernel.
 166                  * TODO(sjg@chromium.org): Support booting both 32-bit and
 167                  * 64-bit kernels from 64-bit U-Boot.
 168                  */
 169 #if !CONFIG_IS_ENABLED(X86_64)
 170                 return cpu_jump_to_64bit(setup_base, load_address);
 171 #endif
 172         } else {
 173                 /*
 174                 * Set %ebx, %ebp, and %edi to 0, %esi to point to the
 175                 * boot_params structure, and then jump to the kernel. We
 176                 * assume that %cs is 0x10, 4GB flat, and read/execute, and
 177                 * the data segments are 0x18, 4GB flat, and read/write.
 178                 * U-Boot is setting them up that way for itself in
 179                 * arch/i386/cpu/cpu.c.
 180                 *
 181                 * Note: this is incomplete for EFI kernels!
 182                 *
 183                 * This can boot a kernel while running as an EFI application,
 184                 * but if the kernel requires EFI support then that support needs
 185                 * to be enabled first (see EFI_LOADER). Also the EFI information
 186                 * must enabled with setup_efi_info(). See setup_zimage() for
 187                 * how this is done with the stub.
 188                 */
 189                 __asm__ __volatile__ (
 190                 "movl $0, %%ebp\n"
 191                 "cli\n"
 192                 "jmp *%[kernel_entry]\n"
 193                 :: [kernel_entry]"a"(load_address),
 194                 [boot_params] "S"(setup_base),
 195                 "b"(0), "D"(0)
 196                 );
 197         }
 198
 199         /* We can't get to here */
 200         return -EFAULT;
 201 }
 202
 203 /* Subcommand: GO */
 204 static int boot_jump_linux(bootm_headers_t *images)
 205 {
 206         debug("## Transferring control to Linux (at address %08lx, kernel %08lx) ...\n",
 207               images->ep, images->os.load);
 208
 209         return boot_linux_kernel(images->ep, images->os.load,
 210                                  images->os.arch == IH_ARCH_X86_64);
 211 }
 212
 213 int do_bootm_linux(int flag, int argc, char *const argv[],
 214                    bootm_headers_t *images)
 215 {
 216         /* No need for those on x86 */
 217         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 218                 return -1;
 219
 220         if (flag & BOOTM_STATE_OS_PREP)
 221                 return boot_prep_linux(images);
 222
 223         if (flag & BOOTM_STATE_OS_GO)
 224                 return boot_jump_linux(images);
 225
 226         return boot_jump_linux(images);
 227 }
 228
 229 static ulong get_sp(void)
 230 {
 231         ulong ret;
 232
 233 #if CONFIG_IS_ENABLED(X86_64)
 234         ret = gd->start_addr_sp;
 235 #else
 236         asm("mov %%esp, %0" : "=r"(ret) : );
 237 #endif
 238
 239         return ret;
 240 }
 241
 242 void arch_lmb_reserve(struct lmb *lmb)
 243 {
 244         arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
 245 }