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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, daniel@omicron.se
*/
#ifndef _ASM_ZIMAGE_H_
#define _ASM_ZIMAGE_H_
#include <asm/bootparam.h>
#include <asm/e820.h>
/* linux i386 zImage/bzImage header. Offsets relative to
* the start of the image */
#define HEAP_FLAG 0x80
#define BIG_KERNEL_FLAG 0x01
/* magic numbers */
#define KERNEL_MAGIC 0xaa55
#define KERNEL_V2_MAGIC 0x53726448
#define COMMAND_LINE_MAGIC 0xA33F
/* limits */
#define BZIMAGE_MAX_SIZE 15*1024*1024 /* 15MB */
#define ZIMAGE_MAX_SIZE 512*1024 /* 512k */
#define SETUP_MAX_SIZE 32768
#define SETUP_START_OFFSET 0x200
#define BZIMAGE_LOAD_ADDR 0x100000
#define ZIMAGE_LOAD_ADDR 0x10000
enum {
ZBOOT_STATE_START = BIT(0),
ZBOOT_STATE_LOAD = BIT(1),
ZBOOT_STATE_SETUP = BIT(2),
ZBOOT_STATE_INFO = BIT(3),
ZBOOT_STATE_GO = BIT(4),
/* This one doesn't execute automatically, so stop the count before 5 */
ZBOOT_STATE_DUMP = BIT(5),
ZBOOT_STATE_COUNT = 5,
};
/**
* struct zboot_state - Current state of the boot
*
* @bzimage_addr: Address of the bzImage to boot, or 0 if the image has already
* been loaded and does not exist (as a cohesive whole) in memory
* @bzimage_size: Size of the bzImage, or 0 to detect this
* @initrd_addr: Address of the initial ramdisk, or 0 if none
* @initrd_size: Size of the initial ramdisk, or 0 if none
* @load_address: Address where the bzImage is moved before booting, either
* BZIMAGE_LOAD_ADDR or ZIMAGE_LOAD_ADDR
* This is set up when loading the zimage
* @base_ptr: Pointer to the boot parameters, typically at address
* DEFAULT_SETUP_BASE
* This is set up when loading the zimage
* @cmdline: Environment variable containing the 'override' command line, or
* NULL to use the one in the setup block
*/
struct zboot_state {
ulong bzimage_addr;
ulong bzimage_size;
ulong initrd_addr;
ulong initrd_size;
ulong load_address;
struct boot_params *base_ptr;
const char *cmdline;
};
extern struct zboot_state state;
/**
* zimage_dump() - Dump information about a zimage
*
* @base_ptr: Pointer to the boot parameters
* @show_cmdline: true to show the kernel command line
*/
void zimage_dump(struct boot_params *base_ptr, bool show_cmdline);
/**
* zboot_load() - Load a zimage
*
* Load the zimage into the correct place
*
* Return: 0 if OK, -ve on error
*/
int zboot_load(void);
/**
* zboot_setup() - Set up the zboot image reeady for booting
*
* Return: 0 if OK, -ve on error
*/
int zboot_setup(void);
/**
* zboot_go() - Start the image
*
* Return: 0 if OK, -ve on error
*/
int zboot_go(void);
/**
* load_zimage() - Load a zImage or bzImage
*
* This copies an image into the standard location ready for setup
*
* @image: Address of image to load
* @kernel_size: Size of kernel including setup block (or 0 if the kernel is
* new enough to have a 'syssize' value)
* @load_addressp: Returns the address where the kernel has been loaded
* Return: address of setup block, or NULL if something went wrong
*/
struct boot_params *load_zimage(char *image, unsigned long kernel_size,
ulong *load_addressp);
/**
* setup_zimage() - Set up a loaded zImage or bzImage ready for booting
*
* @setup_base: Pointer to the boot parameters, typically at address
* DEFAULT_SETUP_BASE
* @cmd_line: Place to put the command line, or NULL to use the one in the setup
* block
* @initrd_addr: Address of the initial ramdisk, or 0 if none
* @initrd_size: Size of the initial ramdisk, or 0 if none
* @load_address: Address where the bzImage is moved before booting, either
* BZIMAGE_LOAD_ADDR or ZIMAGE_LOAD_ADDR
* @cmdline_force: Address of 'override' command line, or 0 to use the one in
* the * setup block
* Return: 0 (always)
*/
int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
ulong initrd_addr, ulong initrd_size, ulong cmdline_force);
#endif
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