arch/x86/lib/bootm.c

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