377 lines
9.0 KiB
C
377 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*/
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/*
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* Linux x86 zImage and bzImage loading
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*
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* based on the procdure described in
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* linux/Documentation/i386/boot.txt
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*/
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#include <common.h>
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#include <env.h>
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#include <irq_func.h>
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#include <malloc.h>
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#include <asm/acpi_table.h>
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#include <asm/io.h>
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#include <asm/ptrace.h>
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#include <asm/zimage.h>
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#include <asm/byteorder.h>
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#include <asm/bootm.h>
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#include <asm/bootparam.h>
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#ifdef CONFIG_SYS_COREBOOT
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#include <asm/arch/timestamp.h>
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#endif
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#include <linux/compiler.h>
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#include <linux/libfdt.h>
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/*
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* Memory lay-out:
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*
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* relative to setup_base (which is 0x90000 currently)
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*
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* 0x0000-0x7FFF Real mode kernel
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* 0x8000-0x8FFF Stack and heap
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* 0x9000-0x90FF Kernel command line
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*/
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#define DEFAULT_SETUP_BASE 0x90000
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#define COMMAND_LINE_OFFSET 0x9000
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#define HEAP_END_OFFSET 0x8e00
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#define COMMAND_LINE_SIZE 2048
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static void build_command_line(char *command_line, int auto_boot)
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{
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char *env_command_line;
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command_line[0] = '\0';
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env_command_line = env_get("bootargs");
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/* set console= argument if we use a serial console */
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if (!strstr(env_command_line, "console=")) {
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if (!strcmp(env_get("stdout"), "serial")) {
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/* We seem to use serial console */
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sprintf(command_line, "console=ttyS0,%s ",
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env_get("baudrate"));
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}
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}
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if (auto_boot)
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strcat(command_line, "auto ");
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if (env_command_line)
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strcat(command_line, env_command_line);
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printf("Kernel command line: \"%s\"\n", command_line);
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}
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static int kernel_magic_ok(struct setup_header *hdr)
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{
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if (KERNEL_MAGIC != hdr->boot_flag) {
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printf("Error: Invalid Boot Flag "
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"(found 0x%04x, expected 0x%04x)\n",
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hdr->boot_flag, KERNEL_MAGIC);
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return 0;
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} else {
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printf("Valid Boot Flag\n");
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return 1;
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}
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}
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static int get_boot_protocol(struct setup_header *hdr)
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{
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if (hdr->header == KERNEL_V2_MAGIC) {
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printf("Magic signature found\n");
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return hdr->version;
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} else {
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/* Very old kernel */
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printf("Magic signature not found\n");
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return 0x0100;
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}
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}
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static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
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{
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int bootproto = get_boot_protocol(hdr);
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struct setup_data *sd;
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int size;
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if (bootproto < 0x0209)
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return -ENOTSUPP;
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if (!fdt_blob)
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return 0;
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size = fdt_totalsize(fdt_blob);
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if (size < 0)
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return -EINVAL;
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size += sizeof(struct setup_data);
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sd = (struct setup_data *)malloc(size);
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if (!sd) {
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printf("Not enough memory for DTB setup data\n");
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return -ENOMEM;
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}
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sd->next = hdr->setup_data;
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sd->type = SETUP_DTB;
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sd->len = fdt_totalsize(fdt_blob);
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memcpy(sd->data, fdt_blob, sd->len);
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hdr->setup_data = (unsigned long)sd;
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return 0;
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}
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struct boot_params *load_zimage(char *image, unsigned long kernel_size,
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ulong *load_addressp)
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{
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struct boot_params *setup_base;
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int setup_size;
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int bootproto;
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int big_image;
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struct boot_params *params = (struct boot_params *)image;
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struct setup_header *hdr = ¶ms->hdr;
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/* base address for real-mode segment */
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setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
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if (!kernel_magic_ok(hdr))
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return 0;
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/* determine size of setup */
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if (0 == hdr->setup_sects) {
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printf("Setup Sectors = 0 (defaulting to 4)\n");
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setup_size = 5 * 512;
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} else {
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setup_size = (hdr->setup_sects + 1) * 512;
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}
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printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
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if (setup_size > SETUP_MAX_SIZE)
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printf("Error: Setup is too large (%d bytes)\n", setup_size);
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/* determine boot protocol version */
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bootproto = get_boot_protocol(hdr);
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printf("Using boot protocol version %x.%02x\n",
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(bootproto & 0xff00) >> 8, bootproto & 0xff);
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if (bootproto >= 0x0200) {
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if (hdr->setup_sects >= 15) {
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printf("Linux kernel version %s\n",
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(char *)params +
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hdr->kernel_version + 0x200);
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} else {
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printf("Setup Sectors < 15 - "
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"Cannot print kernel version.\n");
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}
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}
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/* Determine image type */
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big_image = (bootproto >= 0x0200) &&
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(hdr->loadflags & BIG_KERNEL_FLAG);
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/* Determine load address */
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if (big_image)
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*load_addressp = BZIMAGE_LOAD_ADDR;
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else
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*load_addressp = ZIMAGE_LOAD_ADDR;
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printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
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memset(setup_base, 0, sizeof(*setup_base));
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setup_base->hdr = params->hdr;
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if (bootproto >= 0x0204)
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kernel_size = hdr->syssize * 16;
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else
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kernel_size -= setup_size;
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if (bootproto == 0x0100) {
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/*
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* A very old kernel MUST have its real-mode code
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* loaded at 0x90000
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*/
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if ((ulong)setup_base != 0x90000) {
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/* Copy the real-mode kernel */
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memmove((void *)0x90000, setup_base, setup_size);
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/* Copy the command line */
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memmove((void *)0x99000,
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(u8 *)setup_base + COMMAND_LINE_OFFSET,
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COMMAND_LINE_SIZE);
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/* Relocated */
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setup_base = (struct boot_params *)0x90000;
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}
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/* It is recommended to clear memory up to the 32K mark */
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memset((u8 *)0x90000 + setup_size, 0,
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SETUP_MAX_SIZE - setup_size);
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}
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if (big_image) {
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if (kernel_size > BZIMAGE_MAX_SIZE) {
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printf("Error: bzImage kernel too big! "
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"(size: %ld, max: %d)\n",
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kernel_size, BZIMAGE_MAX_SIZE);
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return 0;
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}
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} else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
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printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
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kernel_size, ZIMAGE_MAX_SIZE);
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return 0;
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}
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printf("Loading %s at address %lx (%ld bytes)\n",
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big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
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memmove((void *)*load_addressp, image + setup_size, kernel_size);
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return setup_base;
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}
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int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
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unsigned long initrd_addr, unsigned long initrd_size)
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{
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struct setup_header *hdr = &setup_base->hdr;
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int bootproto = get_boot_protocol(hdr);
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setup_base->e820_entries = install_e820_map(
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ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
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if (bootproto == 0x0100) {
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setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
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setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
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}
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if (bootproto >= 0x0200) {
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hdr->type_of_loader = 8;
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if (initrd_addr) {
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printf("Initial RAM disk at linear address "
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"0x%08lx, size %ld bytes\n",
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initrd_addr, initrd_size);
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hdr->ramdisk_image = initrd_addr;
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hdr->ramdisk_size = initrd_size;
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}
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}
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if (bootproto >= 0x0201) {
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hdr->heap_end_ptr = HEAP_END_OFFSET;
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hdr->loadflags |= HEAP_FLAG;
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}
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if (cmd_line) {
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if (bootproto >= 0x0202) {
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hdr->cmd_line_ptr = (uintptr_t)cmd_line;
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} else if (bootproto >= 0x0200) {
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setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
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setup_base->screen_info.cl_offset =
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(uintptr_t)cmd_line - (uintptr_t)setup_base;
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hdr->setup_move_size = 0x9100;
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}
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/* build command line at COMMAND_LINE_OFFSET */
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build_command_line(cmd_line, auto_boot);
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}
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#ifdef CONFIG_INTEL_MID
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if (bootproto >= 0x0207)
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hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
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#endif
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#ifdef CONFIG_GENERATE_ACPI_TABLE
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setup_base->acpi_rsdp_addr = acpi_get_rsdp_addr();
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#endif
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setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0));
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setup_video(&setup_base->screen_info);
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#ifdef CONFIG_EFI_STUB
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setup_efi_info(&setup_base->efi_info);
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#endif
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return 0;
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}
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void setup_pcat_compatibility(void)
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__attribute__((weak, alias("__setup_pcat_compatibility")));
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void __setup_pcat_compatibility(void)
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{
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}
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int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
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{
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struct boot_params *base_ptr;
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void *bzImage_addr = NULL;
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ulong load_address;
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char *s;
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ulong bzImage_size = 0;
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ulong initrd_addr = 0;
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ulong initrd_size = 0;
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disable_interrupts();
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/* Setup board for maximum PC/AT Compatibility */
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setup_pcat_compatibility();
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if (argc >= 2) {
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/* argv[1] holds the address of the bzImage */
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s = argv[1];
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} else {
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s = env_get("fileaddr");
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}
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if (s)
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bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
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if (argc >= 3) {
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/* argv[2] holds the size of the bzImage */
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bzImage_size = simple_strtoul(argv[2], NULL, 16);
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}
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if (argc >= 4)
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initrd_addr = simple_strtoul(argv[3], NULL, 16);
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if (argc >= 5)
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initrd_size = simple_strtoul(argv[4], NULL, 16);
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/* Lets look for */
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base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
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if (!base_ptr) {
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puts("## Kernel loading failed ...\n");
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return -1;
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}
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if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
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0, initrd_addr, initrd_size)) {
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puts("Setting up boot parameters failed ...\n");
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return -1;
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}
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/* we assume that the kernel is in place */
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return boot_linux_kernel((ulong)base_ptr, load_address, false);
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}
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U_BOOT_CMD(
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zboot, 5, 0, do_zboot,
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"Boot bzImage",
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"[addr] [size] [initrd addr] [initrd size]\n"
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" addr - The optional starting address of the bzimage.\n"
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" If not set it defaults to the environment\n"
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" variable \"fileaddr\".\n"
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" size - The optional size of the bzimage. Defaults to\n"
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" zero.\n"
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" initrd addr - The address of the initrd image to use, if any.\n"
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" initrd size - The size of the initrd image to use, if any.\n"
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);
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