// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*/
/*
* Linux x86 zImage and bzImage loading
*
* based on the procdure described in
* linux/Documentation/i386/boot.txt
*/
#include <common.h>
#include <malloc.h>
#include <asm/acpi_table.h>
#include <asm/io.h>
#include <asm/ptrace.h>
#include <asm/zimage.h>
#include <asm/byteorder.h>
#include <asm/bootm.h>
#include <asm/bootparam.h>
#ifdef CONFIG_SYS_COREBOOT
#include <asm/arch/timestamp.h>
#endif
#include <linux/compiler.h>
#include <linux/libfdt.h>
/*
* Memory lay-out:
*
* relative to setup_base (which is 0x90000 currently)
*
* 0x0000-0x7FFF Real mode kernel
* 0x8000-0x8FFF Stack and heap
* 0x9000-0x90FF Kernel command line
*/
#define DEFAULT_SETUP_BASE 0x90000
#define COMMAND_LINE_OFFSET 0x9000
#define HEAP_END_OFFSET 0x8e00
#define COMMAND_LINE_SIZE 2048
static void build_command_line(char *command_line, int auto_boot)
{
char *env_command_line;
command_line[0] = '\0';
env_command_line = env_get("bootargs");
/* set console= argument if we use a serial console */
if (!strstr(env_command_line, "console=")) {
if (!strcmp(env_get("stdout"), "serial")) {
/* We seem to use serial console */
sprintf(command_line, "console=ttyS0,%s ",
env_get("baudrate"));
}
}
if (auto_boot)
strcat(command_line, "auto ");
if (env_command_line)
strcat(command_line, env_command_line);
printf("Kernel command line: \"%s\"\n", command_line);
}
static int kernel_magic_ok(struct setup_header *hdr)
{
if (KERNEL_MAGIC != hdr->boot_flag) {
printf("Error: Invalid Boot Flag "
"(found 0x%04x, expected 0x%04x)\n",
hdr->boot_flag, KERNEL_MAGIC);
return 0;
} else {
printf("Valid Boot Flag\n");
return 1;
}
}
static int get_boot_protocol(struct setup_header *hdr)
{
if (hdr->header == KERNEL_V2_MAGIC) {
printf("Magic signature found\n");
return hdr->version;
} else {
/* Very old kernel */
printf("Magic signature not found\n");
return 0x0100;
}
}
static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
{
int bootproto = get_boot_protocol(hdr);
struct setup_data *sd;
int size;
if (bootproto < 0x0209)
return -ENOTSUPP;
if (!fdt_blob)
return 0;
size = fdt_totalsize(fdt_blob);
if (size < 0)
return -EINVAL;
size += sizeof(struct setup_data);
sd = (struct setup_data *)malloc(size);
if (!sd) {
printf("Not enough memory for DTB setup data\n");
return -ENOMEM;
}
sd->next = hdr->setup_data;
sd->type = SETUP_DTB;
sd->len = fdt_totalsize(fdt_blob);
memcpy(sd->data, fdt_blob, sd->len);
hdr->setup_data = (unsigned long)sd;
return 0;
}
struct boot_params *load_zimage(char *image, unsigned long kernel_size,
ulong *load_addressp)
{
struct boot_params *setup_base;
int setup_size;
int bootproto;
int big_image;
struct boot_params *params = (struct boot_params *)image;
struct setup_header *hdr = ¶ms->hdr;
/* base address for real-mode segment */
setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
if (!kernel_magic_ok(hdr))
return 0;
/* determine size of setup */
if (0 == hdr->setup_sects) {
printf("Setup Sectors = 0 (defaulting to 4)\n");
setup_size = 5 * 512;
} else {
setup_size = (hdr->setup_sects + 1) * 512;
}
printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
if (setup_size > SETUP_MAX_SIZE)
printf("Error: Setup is too large (%d bytes)\n", setup_size);
/* determine boot protocol version */
bootproto = get_boot_protocol(hdr);
printf("Using boot protocol version %x.%02x\n",
(bootproto & 0xff00) >> 8, bootproto & 0xff);
if (bootproto >= 0x0200) {
if (hdr->setup_sects >= 15) {
printf("Linux kernel version %s\n",
(char *)params +
hdr->kernel_version + 0x200);
} else {
printf("Setup Sectors < 15 - "
"Cannot print kernel version.\n");
}
}
/* Determine image type */
big_image = (bootproto >= 0x0200) &&
(hdr->loadflags & BIG_KERNEL_FLAG);
/* Determine load address */
if (big_image)
*load_addressp = BZIMAGE_LOAD_ADDR;
else
*load_addressp = ZIMAGE_LOAD_ADDR;
printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
memset(setup_base, 0, sizeof(*setup_base));
setup_base->hdr = params->hdr;
if (bootproto >= 0x0204)
kernel_size = hdr->syssize * 16;
else
kernel_size -= setup_size;
if (bootproto == 0x0100) {
/*
* A very old kernel MUST have its real-mode code
* loaded at 0x90000
*/
if ((ulong)setup_base != 0x90000) {
/* Copy the real-mode kernel */
memmove((void *)0x90000, setup_base, setup_size);
/* Copy the command line */
memmove((void *)0x99000,
(u8 *)setup_base + COMMAND_LINE_OFFSET,
COMMAND_LINE_SIZE);
/* Relocated */
setup_base = (struct boot_params *)0x90000;
}
/* It is recommended to clear memory up to the 32K mark */
memset((u8 *)0x90000 + setup_size, 0,
SETUP_MAX_SIZE - setup_size);
}
if (big_image) {
if (kernel_size > BZIMAGE_MAX_SIZE) {
printf("Error: bzImage kernel too big! "
"(size: %ld, max: %d)\n",
kernel_size, BZIMAGE_MAX_SIZE);
return 0;
}
} else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
kernel_size, ZIMAGE_MAX_SIZE);
return 0;
}
printf("Loading %s at address %lx (%ld bytes)\n",
big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
memmove((void *)*load_addressp, image + setup_size, kernel_size);
return setup_base;
}
int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
unsigned long initrd_addr, unsigned long initrd_size)
{
struct setup_header *hdr = &setup_base->hdr;
int bootproto = get_boot_protocol(hdr);
setup_base->e820_entries = install_e820_map(
ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
if (bootproto == 0x0100) {
setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
}
if (bootproto >= 0x0200) {
hdr->type_of_loader = 8;
if (initrd_addr) {
printf("Initial RAM disk at linear address "
"0x%08lx, size %ld bytes\n",
initrd_addr, initrd_size);
hdr->ramdisk_image = initrd_addr;
hdr->ramdisk_size = initrd_size;
}
}
if (bootproto >= 0x0201) {
hdr->heap_end_ptr = HEAP_END_OFFSET;
hdr->loadflags |= HEAP_FLAG;
}
if (cmd_line) {
if (bootproto >= 0x0202) {
hdr->cmd_line_ptr = (uintptr_t)cmd_line;
} else if (bootproto >= 0x0200) {
setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
setup_base->screen_info.cl_offset =
(uintptr_t)cmd_line - (uintptr_t)setup_base;
hdr->setup_move_size = 0x9100;
}
/* build command line at COMMAND_LINE_OFFSET */
build_command_line(cmd_line, auto_boot);
}
#ifdef CONFIG_INTEL_MID
if (bootproto >= 0x0207)
hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
#endif
#ifdef CONFIG_GENERATE_ACPI_TABLE
if (bootproto >= 0x020e)
hdr->acpi_rsdp_addr = acpi_get_rsdp_addr();
#endif
setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0));
setup_video(&setup_base->screen_info);
return 0;
}
void setup_pcat_compatibility(void)
__attribute__((weak, alias("__setup_pcat_compatibility")));
void __setup_pcat_compatibility(void)
{
}
int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
struct boot_params *base_ptr;
void *bzImage_addr = NULL;
ulong load_address;
char *s;
ulong bzImage_size = 0;
ulong initrd_addr = 0;
ulong initrd_size = 0;
disable_interrupts();
/* Setup board for maximum PC/AT Compatibility */
setup_pcat_compatibility();
if (argc >= 2) {
/* argv[1] holds the address of the bzImage */
s = argv[1];
} else {
s = env_get("fileaddr");
}
if (s)
bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
if (argc >= 3) {
/* argv[2] holds the size of the bzImage */
bzImage_size = simple_strtoul(argv[2], NULL, 16);
}
if (argc >= 4)
initrd_addr = simple_strtoul(argv[3], NULL, 16);
if (argc >= 5)
initrd_size = simple_strtoul(argv[4], NULL, 16);
/* Lets look for */
base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
if (!base_ptr) {
puts("## Kernel loading failed ...\n");
return -1;
}
if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
0, initrd_addr, initrd_size)) {
puts("Setting up boot parameters failed ...\n");
return -1;
}
/* we assume that the kernel is in place */
return boot_linux_kernel((ulong)base_ptr, load_address, false);
}
U_BOOT_CMD(
zboot, 5, 0, do_zboot,
"Boot bzImage",
"[addr] [size] [initrd addr] [initrd size]\n"
" addr - The optional starting address of the bzimage.\n"
" If not set it defaults to the environment\n"
" variable \"fileaddr\".\n"
" size - The optional size of the bzimage. Defaults to\n"
" zero.\n"
" initrd addr - The address of the initrd image to use, if any.\n"
" initrd size - The size of the initrd image to use, if any.\n"
);