[mirror_ubuntu-kernels.git] / arch / x86 / include / asm / page_32_types.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PAGE_32_DEFS_H
#define _ASM_X86_PAGE_32_DEFS_H

#include <linux/const.h>

/*
 * This handles the memory map.
 *
 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
 * a virtual address space of one gigabyte, which limits the
 * amount of physical memory you can use to about 950MB.
 *
 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
 * and CONFIG_HIGHMEM64G options in the kernel configuration.
 */
#define __PAGE_OFFSET_BASE	_AC(CONFIG_PAGE_OFFSET, UL)
#define __PAGE_OFFSET		__PAGE_OFFSET_BASE

#define __START_KERNEL_map	__PAGE_OFFSET

#define THREAD_SIZE_ORDER	1
#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)

#define DOUBLEFAULT_STACK 1
#define NMI_STACK 0
#define DEBUG_STACK 0
#define MCE_STACK 0
#define N_EXCEPTION_STACKS 1

#ifdef CONFIG_X86_PAE
/* 44=32+12, the limit we can fit into an unsigned long pfn */
#define __PHYSICAL_MASK_SHIFT	44
#define __VIRTUAL_MASK_SHIFT	32

#else  /* !CONFIG_X86_PAE */
#define __PHYSICAL_MASK_SHIFT	32
#define __VIRTUAL_MASK_SHIFT	32
#endif	/* CONFIG_X86_PAE */

/*
 * Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
 */
#define KERNEL_IMAGE_SIZE	(512 * 1024 * 1024)

#ifndef __ASSEMBLY__

/*
 * This much address space is reserved for vmalloc() and iomap()
 * as well as fixmap mappings.
 */
extern unsigned int __VMALLOC_RESERVE;
extern int sysctl_legacy_va_layout;

extern void find_low_pfn_range(void);
extern void setup_bootmem_allocator(void);

#endif	/* !__ASSEMBLY__ */

#endif /* _ASM_X86_PAGE_32_DEFS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
51c78eb3 JF	2	#ifndef _ASM_X86_PAGE_32_DEFS_H
	3	#define _ASM_X86_PAGE_32_DEFS_H
	4
	5	#include <linux/const.h>
	6
	7	/*
	8	* This handles the memory map.
	9	*
	10	* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
	11	* a virtual address space of one gigabyte, which limits the
	12	* amount of physical memory you can use to about 950MB.
	13	*
	14	* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
	15	* and CONFIG_HIGHMEM64G options in the kernel configuration.
	16	*/
4a1a8e1b BP	17	#define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL)
4a1a8e1b BP	18	#define __PAGE_OFFSET __PAGE_OFFSET_BASE
51c78eb3	19
a0215061 KC	20	#define __START_KERNEL_map __PAGE_OFFSET
a0215061 KC	21
38e7c572 TG	22	#define THREAD_SIZE_ORDER 1
38e7c572 TG	23	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
51c78eb3	24
51c78eb3 JF	25	#define DOUBLEFAULT_STACK 1
	26	#define NMI_STACK 0
	27	#define DEBUG_STACK 0
	28	#define MCE_STACK 0
	29	#define N_EXCEPTION_STACKS 1
	30
	31	#ifdef CONFIG_X86_PAE
	32	/* 44=32+12, the limit we can fit into an unsigned long pfn */
	33	#define __PHYSICAL_MASK_SHIFT 44
	34	#define __VIRTUAL_MASK_SHIFT 32
51c78eb3 JF	35
	36	#else /* !CONFIG_X86_PAE */
	37	#define __PHYSICAL_MASK_SHIFT 32
	38	#define __VIRTUAL_MASK_SHIFT 32
51c78eb3 JF	39	#endif /* CONFIG_X86_PAE */
51c78eb3 JF	40
7543c1de YL	41	/*
	42	* Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
	43	*/
	44	#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
	45
51c78eb3 JF	46	#ifndef __ASSEMBLY__
51c78eb3 JF	47
51c78eb3 JF	48	/*
	49	* This much address space is reserved for vmalloc() and iomap()
	50	* as well as fixmap mappings.
	51	*/
	52	extern unsigned int __VMALLOC_RESERVE;
	53	extern int sysctl_legacy_va_layout;
	54
	55	extern void find_low_pfn_range(void);
51c78eb3 JF	56	extern void setup_bootmem_allocator(void);
	57
	58	#endif /* !__ASSEMBLY__ */
	59
	60	#endif /* _ASM_X86_PAGE_32_DEFS_H */