[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / page_64_types.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PAGE_64_DEFS_H
#define _ASM_X86_PAGE_64_DEFS_H

#ifndef __ASSEMBLY__
#include <asm/kaslr.h>
#endif

#ifdef CONFIG_KASAN
#define KASAN_STACK_ORDER 1
#else
#define KASAN_STACK_ORDER 0
#endif

#define THREAD_SIZE_ORDER	(2 + KASAN_STACK_ORDER)
#define THREAD_SIZE  (PAGE_SIZE << THREAD_SIZE_ORDER)
#define CURRENT_MASK (~(THREAD_SIZE - 1))

#define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)

#define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
#define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)

#define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
#define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)

#define DOUBLEFAULT_STACK 1
#define NMI_STACK 2
#define DEBUG_STACK 3
#define MCE_STACK 4
#define N_EXCEPTION_STACKS 4  /* hw limit: 7 */

/*
 * Set __PAGE_OFFSET to the most negative possible address +
 * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a
 * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's
 * what Xen requires.
 */
#ifdef CONFIG_X86_5LEVEL
#define __PAGE_OFFSET_BASE      _AC(0xff10000000000000, UL)
#else
#define __PAGE_OFFSET_BASE      _AC(0xffff880000000000, UL)
#endif

#ifdef CONFIG_RANDOMIZE_MEMORY
#define __PAGE_OFFSET           page_offset_base
#else
#define __PAGE_OFFSET           __PAGE_OFFSET_BASE
#endif /* CONFIG_RANDOMIZE_MEMORY */

#define __START_KERNEL_map	_AC(0xffffffff80000000, UL)

/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
#ifdef CONFIG_X86_5LEVEL
#define __PHYSICAL_MASK_SHIFT	52
#define __VIRTUAL_MASK_SHIFT	56
#else
#define __PHYSICAL_MASK_SHIFT	46
#define __VIRTUAL_MASK_SHIFT	47
#endif

/*
 * Kernel image size is limited to 1GiB due to the fixmap living in the
 * next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
 * 512MiB by default, leaving 1.5GiB for modules once the page tables
 * are fully set up. If kernel ASLR is configured, it can extend the
 * kernel page table mapping, reducing the size of the modules area.
 */
#if defined(CONFIG_RANDOMIZE_BASE)
#define KERNEL_IMAGE_SIZE	(1024 * 1024 * 1024)
#else
#define KERNEL_IMAGE_SIZE	(512 * 1024 * 1024)
#endif

#endif /* _ASM_X86_PAGE_64_DEFS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
51c78eb3 JF	2	#ifndef _ASM_X86_PAGE_64_DEFS_H
	3	#define _ASM_X86_PAGE_64_DEFS_H
	4
021182e5 TG	5	#ifndef __ASSEMBLY__
	6	#include <asm/kaslr.h>
	7	#endif
	8
c420f167 AR	9	#ifdef CONFIG_KASAN
	10	#define KASAN_STACK_ORDER 1
	11	#else
	12	#define KASAN_STACK_ORDER 0
	13	#endif
	14
	15	#define THREAD_SIZE_ORDER (2 + KASAN_STACK_ORDER)
38e7c572	16	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
51c78eb3 JF	17	#define CURRENT_MASK (~(THREAD_SIZE - 1))
51c78eb3 JF	18
c420f167	19	#define EXCEPTION_STACK_ORDER (0 + KASAN_STACK_ORDER)
51c78eb3 JF	20	#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
	21
	22	#define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
	23	#define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
	24
c420f167	25	#define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER)
51c78eb3 JF	26	#define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)
51c78eb3 JF	27
6f442be2 AL	28	#define DOUBLEFAULT_STACK 1
	29	#define NMI_STACK 2
	30	#define DEBUG_STACK 3
	31	#define MCE_STACK 4
	32	#define N_EXCEPTION_STACKS 4 /* hw limit: 7 */
51c78eb3	33
51c78eb3 JF	34	/*
	35	* Set __PAGE_OFFSET to the most negative possible address +
	36	* PGDIR_SIZE*16 (pgd slot 272). The gap is to allow a space for a
	37	* hypervisor to fit. Choosing 16 slots here is arbitrary, but it's
	38	* what Xen requires.
	39	*/
4c7c4483 KS	40	#ifdef CONFIG_X86_5LEVEL
	41	#define __PAGE_OFFSET_BASE _AC(0xff10000000000000, UL)
	42	#else
021182e5	43	#define __PAGE_OFFSET_BASE _AC(0xffff880000000000, UL)
4c7c4483 KS	44	#endif
4c7c4483 KS	45
021182e5 TG	46	#ifdef CONFIG_RANDOMIZE_MEMORY
	47	#define __PAGE_OFFSET page_offset_base
	48	#else
	49	#define __PAGE_OFFSET __PAGE_OFFSET_BASE
	50	#endif /* CONFIG_RANDOMIZE_MEMORY */
51c78eb3	51
51c78eb3 JF	52	#define __START_KERNEL_map _AC(0xffffffff80000000, UL)
51c78eb3 JF	53
c898faf9	54	/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
4c7c4483 KS	55	#ifdef CONFIG_X86_5LEVEL
	56	#define __PHYSICAL_MASK_SHIFT 52
	57	#define __VIRTUAL_MASK_SHIFT 56
	58	#else
51c78eb3	59	#define __PHYSICAL_MASK_SHIFT 46
9063c61f	60	#define __VIRTUAL_MASK_SHIFT 47
4c7c4483	61	#endif
51c78eb3 JF	62
51c78eb3 JF	63	/*
6145cfe3 KC	64	* Kernel image size is limited to 1GiB due to the fixmap living in the
	65	* next 1GiB (see level2_kernel_pgt in arch/x86/kernel/head_64.S). Use
	66	* 512MiB by default, leaving 1.5GiB for modules once the page tables
	67	* are fully set up. If kernel ASLR is configured, it can extend the
	68	* kernel page table mapping, reducing the size of the modules area.
51c78eb3	69	*/
e8581e3d BH	70	#if defined(CONFIG_RANDOMIZE_BASE)
e8581e3d BH	71	#define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024)
6145cfe3	72	#else
e8581e3d	73	#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
6145cfe3	74	#endif
51c78eb3	75
51c78eb3	76	#endif /* _ASM_X86_PAGE_64_DEFS_H */