/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PAGE_32_DEFS_H
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#define _ASM_X86_PAGE_32_DEFS_H
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#include <linux/const.h>
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/*
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* This handles the memory map.
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*
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* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
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* a virtual address space of one gigabyte, which limits the
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* amount of physical memory you can use to about 950MB.
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*
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* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
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* and CONFIG_HIGHMEM64G options in the kernel configuration.
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*/
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#define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL)
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#define __PAGE_OFFSET __PAGE_OFFSET_BASE
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#define __START_KERNEL_map __PAGE_OFFSET
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#define IRQ_STACK_SIZE THREAD_SIZE
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#define N_EXCEPTION_STACKS 1
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#ifdef CONFIG_X86_PAE
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/*
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* This is beyond the 44 bit limit imposed by the 32bit long pfns,
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* but we need the full mask to make sure inverted PROT_NONE
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* entries have all the host bits set in a guest.
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* The real limit is still 44 bits.
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*/
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#define __PHYSICAL_MASK_SHIFT 52
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#define __VIRTUAL_MASK_SHIFT 32
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#else /* !CONFIG_X86_PAE */
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#define __PHYSICAL_MASK_SHIFT 32
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#define __VIRTUAL_MASK_SHIFT 32
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#endif /* CONFIG_X86_PAE */
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/*
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* User space process size: 3GB (default).
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*/
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#define IA32_PAGE_OFFSET __PAGE_OFFSET
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#define TASK_SIZE __PAGE_OFFSET
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#define TASK_SIZE_LOW TASK_SIZE
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#define TASK_SIZE_MAX TASK_SIZE
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#define DEFAULT_MAP_WINDOW TASK_SIZE
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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/*
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* Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
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*/
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#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
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#ifndef __ASSEMBLY__
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/*
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* This much address space is reserved for vmalloc() and iomap()
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* as well as fixmap mappings.
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*/
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extern unsigned int __VMALLOC_RESERVE;
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extern int sysctl_legacy_va_layout;
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extern void find_low_pfn_range(void);
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extern void setup_bootmem_allocator(void);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_PAGE_32_DEFS_H */
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