/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PGTABLE_32_DEFS_H
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#define _ASM_X86_PGTABLE_32_DEFS_H
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/*
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* The Linux x86 paging architecture is 'compile-time dual-mode', it
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* implements both the traditional 2-level x86 page tables and the
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* newer 3-level PAE-mode page tables.
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*/
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#ifdef CONFIG_X86_PAE
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# include <asm/pgtable-3level_types.h>
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# define PMD_SIZE (1UL << PMD_SHIFT)
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# define PMD_MASK (~(PMD_SIZE - 1))
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#else
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# include <asm/pgtable-2level_types.h>
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#endif
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#define pgtable_l5_enabled() 0
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE - 1))
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/* Just any arbitrary offset to the start of the vmalloc VM area: the
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* current 8MB value just means that there will be a 8MB "hole" after the
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* physical memory until the kernel virtual memory starts. That means that
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* any out-of-bounds memory accesses will hopefully be caught.
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* The vmalloc() routines leaves a hole of 4kB between each vmalloced
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* area for the same reason. ;)
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*/
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#define VMALLOC_OFFSET (8 * 1024 * 1024)
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#ifndef __ASSEMBLY__
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extern bool __vmalloc_start_set; /* set once high_memory is set */
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#endif
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#define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET)
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#ifdef CONFIG_X86_PAE
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#define LAST_PKMAP 512
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#else
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#define LAST_PKMAP 1024
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#endif
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/*
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* Define this here and validate with BUILD_BUG_ON() in pgtable_32.c
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* to avoid include recursion hell
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*/
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#define CPU_ENTRY_AREA_PAGES (NR_CPUS * 40)
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#define CPU_ENTRY_AREA_BASE \
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((FIXADDR_TOT_START - PAGE_SIZE * (CPU_ENTRY_AREA_PAGES + 1)) \
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& PMD_MASK)
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#define LDT_BASE_ADDR \
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((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)
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#define LDT_END_ADDR (LDT_BASE_ADDR + PMD_SIZE)
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#define PKMAP_BASE \
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((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)
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#ifdef CONFIG_HIGHMEM
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# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE)
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#else
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# define VMALLOC_END (LDT_BASE_ADDR - 2 * PAGE_SIZE)
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#endif
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#define MODULES_VADDR VMALLOC_START
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#define MODULES_END VMALLOC_END
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#define MODULES_LEN (MODULES_VADDR - MODULES_END)
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#define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
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#endif /* _ASM_X86_PGTABLE_32_DEFS_H */
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