[linux-2.6-block.git] / arch / x86 / include / asm / boot.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_BOOT_H
#define _ASM_X86_BOOT_H


#include <asm/pgtable_types.h>
#include <uapi/asm/boot.h>

/* Physical address where kernel should be loaded. */
#define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \
				+ (CONFIG_PHYSICAL_ALIGN - 1)) \
				& ~(CONFIG_PHYSICAL_ALIGN - 1))

/* Minimum kernel alignment, as a power of two */
#ifdef CONFIG_X86_64
# define MIN_KERNEL_ALIGN_LG2	PMD_SHIFT
#else
# define MIN_KERNEL_ALIGN_LG2	(PAGE_SHIFT + THREAD_SIZE_ORDER)
#endif
#define MIN_KERNEL_ALIGN	(_AC(1, UL) << MIN_KERNEL_ALIGN_LG2)

#if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \
	(CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN)
# error "Invalid value for CONFIG_PHYSICAL_ALIGN"
#endif

#if defined(CONFIG_KERNEL_BZIP2)
# define BOOT_HEAP_SIZE		0x400000
#elif defined(CONFIG_KERNEL_ZSTD)
/*
 * Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel.
 * The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a
 * round number and to allow some slack.
 */
# define BOOT_HEAP_SIZE		 0x30000
#else
# define BOOT_HEAP_SIZE		 0x10000
#endif

#ifdef CONFIG_X86_64
# define BOOT_STACK_SIZE	0x4000

/*
 * Used by decompressor's startup_32() to allocate page tables for identity
 * mapping of the 4G of RAM in 4-level paging mode:
 * - 1 level4 table;
 * - 1 level3 table;
 * - 4 level2 table that maps everything with 2M pages;
 *
 * The additional level5 table needed for 5-level paging is allocated from
 * trampoline_32bit memory.
 */
# define BOOT_INIT_PGT_SIZE	(6*4096)

/*
 * Total number of page tables kernel_add_identity_map() can allocate,
 * including page tables consumed by startup_32().
 *
 * Worst-case scenario:
 *  - 5-level paging needs 1 level5 table;
 *  - KASLR needs to map kernel, boot_params, cmdline and randomized kernel,
 *    assuming all of them cross 256T boundary:
 *    + 4*2 level4 table;
 *    + 4*2 level3 table;
 *    + 4*2 level2 table;
 *  - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM):
 *    + 1 level4 table;
 *    + 1 level3 table;
 *    + 1 level2 table;
 * Total: 28 tables
 *
 * Add 4 spare table in case decompressor touches anything beyond what is
 * accounted above. Warn if it happens.
 */
# define BOOT_PGT_SIZE_WARN	(28*4096)
# define BOOT_PGT_SIZE		(32*4096)

#else /* !CONFIG_X86_64 */
# define BOOT_STACK_SIZE	0x1000
#endif

#ifndef __ASSEMBLY__
extern unsigned int output_len;
extern const unsigned long kernel_total_size;

unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr,
				void (*error)(char *x));

extern struct boot_params *boot_params_ptr;
#endif

#endif /* _ASM_X86_BOOT_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1965aae3 PA	2	#ifndef _ASM_X86_BOOT_H
1965aae3 PA	3	#define _ASM_X86_BOOT_H
1da177e4	4
95c4bff0	5
658dbfeb	6	#include <asm/pgtable_types.h>
af170c50	7	#include <uapi/asm/boot.h>
37ba7ab5	8
beb7dd86	9	/* Physical address where kernel should be loaded. */
dd0ec16f VG	10	#define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \
dd0ec16f VG	11	+ (CONFIG_PHYSICAL_ALIGN - 1)) \
e69f202d VG	12	& ~(CONFIG_PHYSICAL_ALIGN - 1))
e69f202d VG	13
37ba7ab5	14	/* Minimum kernel alignment, as a power of two */
22f4319d	15	#ifdef CONFIG_X86_64
8665e6ff	16	# define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT
37ba7ab5	17	#else
8665e6ff	18	# define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT + THREAD_SIZE_ORDER)
37ba7ab5 PA	19	#endif
	20	#define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2)
	21
	22	#if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) \|\| \
6fc108a0	23	(CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN)
8665e6ff	24	# error "Invalid value for CONFIG_PHYSICAL_ALIGN"
37ba7ab5 PA	25	#endif
37ba7ab5 PA	26
fb46d057	27	#if defined(CONFIG_KERNEL_BZIP2)
8665e6ff	28	# define BOOT_HEAP_SIZE 0x400000
fb46d057 NT	29	#elif defined(CONFIG_KERNEL_ZSTD)
	30	/*
	31	* Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel.
	32	* The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a
	33	* round number and to allow some slack.
	34	*/
	35	# define BOOT_HEAP_SIZE 0x30000
	36	#else
8665e6ff KC	37	# define BOOT_HEAP_SIZE 0x10000
8665e6ff KC	38	#endif
ae03c499 AK	39
ae03c499 AK	40	#ifdef CONFIG_X86_64
8665e6ff	41	# define BOOT_STACK_SIZE 0x4000
3a94707d	42
f530ee95 KS	43	/*
	44	* Used by decompressor's startup_32() to allocate page tables for identity
	45	* mapping of the 4G of RAM in 4-level paging mode:
	46	* - 1 level4 table;
	47	* - 1 level3 table;
	48	* - 4 level2 table that maps everything with 2M pages;
	49	*
	50	* The additional level5 table needed for 5-level paging is allocated from
	51	* trampoline_32bit memory.
	52	*/
3a94707d	53	# define BOOT_INIT_PGT_SIZE (6*4096)
f530ee95	54
3a94707d	55	/*
f530ee95 KS	56	* Total number of page tables kernel_add_identity_map() can allocate,
	57	* including page tables consumed by startup_32().
	58	*
	59	* Worst-case scenario:
	60	* - 5-level paging needs 1 level5 table;
	61	* - KASLR needs to map kernel, boot_params, cmdline and randomized kernel,
	62	* assuming all of them cross 256T boundary:
	63	* + 4*2 level4 table;
	64	* + 4*2 level3 table;
	65	* + 4*2 level2 table;
	66	* - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM):
	67	* + 1 level4 table;
	68	* + 1 level3 table;
	69	* + 1 level2 table;
	70	* Total: 28 tables
	71	*
	72	* Add 4 spare table in case decompressor touches anything beyond what is
	73	* accounted above. Warn if it happens.
3a94707d	74	*/
f530ee95 KS	75	# define BOOT_PGT_SIZE_WARN (28*4096)
f530ee95 KS	76	# define BOOT_PGT_SIZE (32*4096)
3a94707d	77
8665e6ff KC	78	#else /* !CONFIG_X86_64 */
8665e6ff KC	79	# define BOOT_STACK_SIZE 0x1000
7c539764 AH	80	#endif
7c539764 AH	81
83381519 AB	82	#ifndef __ASSEMBLY__
	83	extern unsigned int output_len;
	84	extern const unsigned long kernel_total_size;
	85
	86	unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr,
	87	void (error)(char x));
d55d5bc5 AB	88
d55d5bc5 AB	89	extern struct boot_params *boot_params_ptr;
83381519 AB	90	#endif
83381519 AB	91
1965aae3	92	#endif /* _ASM_X86_BOOT_H */