/* SPDX-License-Identifier: GPL-2.0-only */ /* * arch/arm/include/asm/pgtable-nommu.h * * Copyright (C) 1995-2002 Russell King * Copyright (C) 2004 Hyok S. Choi */ #ifndef _ASMARM_PGTABLE_NOMMU_H #define _ASMARM_PGTABLE_NOMMU_H #ifndef __ASSEMBLY__ #include #include #include /* * Trivial page table functions. */ #define pgd_present(pgd) (1) #define pgd_none(pgd) (0) #define pgd_bad(pgd) (0) #define pgd_clear(pgdp) #define kern_addr_valid(addr) (1) /* FIXME */ /* * PMD_SHIFT determines the size of the area a second-level page table can map * PGDIR_SHIFT determines what a third-level page table entry can map */ #define PGDIR_SHIFT 21 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* FIXME */ #define PAGE_NONE __pgprot(0) #define PAGE_SHARED __pgprot(0) #define PAGE_COPY __pgprot(0) #define PAGE_READONLY __pgprot(0) #define PAGE_KERNEL __pgprot(0) #define swapper_pg_dir ((pgd_t *) 0) typedef pte_t *pte_addr_t; /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ #define ZERO_PAGE(vaddr) (virt_to_page(0)) /* * Mark the prot value as uncacheable and unbufferable. */ #define pgprot_noncached(prot) (prot) #define pgprot_writecombine(prot) (prot) #define pgprot_device(prot) (prot) /* * These would be in other places but having them here reduces the diffs. */ extern unsigned int kobjsize(const void *objp); /* * All 32bit addresses are effectively valid for vmalloc... * Sort of meaningless for non-VM targets. */ #define VMALLOC_START 0UL #define VMALLOC_END 0xffffffffUL #define FIRST_USER_ADDRESS 0UL #else /* * dummy tlb and user structures. */ #define v3_tlb_fns (0) #define v4_tlb_fns (0) #define v4wb_tlb_fns (0) #define v4wbi_tlb_fns (0) #define v6wbi_tlb_fns (0) #define v7wbi_tlb_fns (0) #define v3_user_fns (0) #define v4_user_fns (0) #define v4_mc_user_fns (0) #define v4wb_user_fns (0) #define v4wt_user_fns (0) #define v6_user_fns (0) #define xscale_mc_user_fns (0) #endif /*__ASSEMBLY__*/ #endif /* _ASMARM_PGTABLE_H */