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fac7757e1f
Currently most platforms define FIRST_USER_ADDRESS as 0UL duplication the same code all over. Instead just define a generic default value (i.e 0UL) for FIRST_USER_ADDRESS and let the platforms override when required. This makes it much cleaner with reduced code. The default FIRST_USER_ADDRESS here would be skipped in <linux/pgtable.h> when the given platform overrides its value via <asm/pgtable.h>. Link: https://lkml.kernel.org/r/1620615725-24623-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Guo Ren <guoren@kernel.org> [csky] Acked-by: Stafford Horne <shorne@gmail.com> [openrisc] Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arm64] Acked-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Palmer Dabbelt <palmerdabbelt@google.com> [RISC-V] Cc: Richard Henderson <rth@twiddle.net> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Guo Ren <guoren@kernel.org> Cc: Brian Cain <bcain@codeaurora.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Stafford Horne <shorne@gmail.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright 2003 PathScale Inc
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* Derived from include/asm-i386/pgtable.h
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*/
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#ifndef __UM_PGTABLE_3LEVEL_H
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#define __UM_PGTABLE_3LEVEL_H
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#include <asm-generic/pgtable-nopud.h>
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#ifdef CONFIG_64BIT
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#define PGDIR_SHIFT 30
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#else
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#define PGDIR_SHIFT 31
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#endif
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/* PMD_SHIFT determines the size of the area a second-level page table can
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* map
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*/
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#define PMD_SHIFT 21
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/*
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* entries per page directory level
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*/
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#define PTRS_PER_PTE 512
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#ifdef CONFIG_64BIT
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#define PTRS_PER_PMD 512
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#define PTRS_PER_PGD 512
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#else
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#define PTRS_PER_PMD 1024
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#define PTRS_PER_PGD 1024
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#endif
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#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
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pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
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pmd_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
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pgd_val(e))
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#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
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#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
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#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
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#define pud_populate(mm, pud, pmd) \
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set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
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#ifdef CONFIG_64BIT
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#define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
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#else
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#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
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#endif
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static inline int pgd_newpage(pgd_t pgd)
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{
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return(pgd_val(pgd) & _PAGE_NEWPAGE);
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}
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static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
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#ifdef CONFIG_64BIT
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#define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
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#else
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
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#endif
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static inline void pud_clear (pud_t *pud)
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{
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set_pud(pud, __pud(_PAGE_NEWPAGE));
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}
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#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
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#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
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static inline unsigned long pte_pfn(pte_t pte)
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{
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return phys_to_pfn(pte_val(pte));
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}
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static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
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{
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pte_t pte;
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phys_t phys = pfn_to_phys(page_nr);
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pte_set_val(pte, phys, pgprot);
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return pte;
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}
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static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
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{
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return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
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}
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#endif
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