mirror of
https://gitee.com/bianbu-linux/linux-6.6
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e025ab842e
Most architectures (except arm64/x86/sparc) simply return 1 for kern_addr_valid(), which is only used in read_kcore(), and it calls copy_from_kernel_nofault() which could check whether the address is a valid kernel address. So as there is no need for kern_addr_valid(), let's remove it. Link: https://lkml.kernel.org/r/20221018074014.185687-1-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Heiko Carstens <hca@linux.ibm.com> [s390] Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Helge Deller <deller@gmx.de> [parisc] Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Acked-by: Guo Ren <guoren@kernel.org> [csky] Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arm64] Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: <aou@eecs.berkeley.edu> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Chris Zankel <chris@zankel.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Jonas Bonn <jonas@southpole.se> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@rivosinc.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Will Deacon <will@kernel.org> Cc: Xuerui Wang <kernel@xen0n.name> Cc: Yoshinori Sato <ysato@users.osdn.me> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
185 lines
5 KiB
C
185 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _M68K_PGTABLE_H
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#define _M68K_PGTABLE_H
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#if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE)
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#include <asm-generic/pgtable-nopmd.h>
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#else
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#include <asm-generic/pgtable-nopud.h>
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#endif
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#include <asm/setup.h>
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#include <linux/sched.h>
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#include <linux/threads.h>
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/*
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* This file contains the functions and defines necessary to modify and use
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* the m68k page table tree.
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*/
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#include <asm/virtconvert.h>
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/* Certain architectures need to do special things when pte's
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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#define set_pte(pteptr, pteval) \
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do{ \
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*(pteptr) = (pteval); \
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} while(0)
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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/* PMD_SHIFT determines the size of the area a second-level page table can map */
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#if CONFIG_PGTABLE_LEVELS == 3
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#define PMD_SHIFT 18
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#endif
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#ifdef CONFIG_SUN3
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#define PGDIR_SHIFT 17
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#elif defined(CONFIG_COLDFIRE)
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#define PGDIR_SHIFT 22
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#else
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#define PGDIR_SHIFT 25
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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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/*
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* entries per page directory level: the m68k is configured as three-level,
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* so we do have PMD level physically.
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*/
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#ifdef CONFIG_SUN3
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#define PTRS_PER_PTE 16
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#define __PAGETABLE_PMD_FOLDED 1
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PGD 2048
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#elif defined(CONFIG_COLDFIRE)
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#define PTRS_PER_PTE 512
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#define __PAGETABLE_PMD_FOLDED 1
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PGD 1024
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#else
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#define PTRS_PER_PTE 64
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#define PTRS_PER_PMD 128
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#define PTRS_PER_PGD 128
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#endif
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#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
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/* Virtual address region for use by kernel_map() */
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#ifdef CONFIG_SUN3
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#define KMAP_START 0x0dc00000
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#define KMAP_END 0x0e000000
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#elif defined(CONFIG_COLDFIRE)
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#define KMAP_START 0xe0000000
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#define KMAP_END 0xf0000000
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#elif defined(CONFIG_VIRT)
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#define KMAP_START 0xdf000000
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#define KMAP_END 0xff000000
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#else
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#define KMAP_START 0xd0000000
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#define KMAP_END 0xf0000000
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#endif
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#ifdef CONFIG_SUN3
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extern unsigned long m68k_vmalloc_end;
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#define VMALLOC_START 0x0f800000
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#define VMALLOC_END m68k_vmalloc_end
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#elif defined(CONFIG_COLDFIRE)
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#define VMALLOC_START 0xd0000000
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#define VMALLOC_END 0xe0000000
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#elif defined(CONFIG_VIRT)
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#define VMALLOC_OFFSET PAGE_SIZE
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#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
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#define VMALLOC_END KMAP_START
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#else
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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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#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
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#define VMALLOC_END KMAP_START
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#endif
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/* zero page used for uninitialized stuff */
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extern void *empty_zero_page;
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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/* number of bits that fit into a memory pointer */
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#define BITS_PER_PTR (8*sizeof(unsigned long))
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/* to align the pointer to a pointer address */
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#define PTR_MASK (~(sizeof(void*)-1))
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/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
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/* 64-bit machines, beware! SRB. */
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#define SIZEOF_PTR_LOG2 2
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extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
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/*
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* The m68k doesn't have any external MMU info: the kernel page
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* tables contain all the necessary information. The Sun3 does, but
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* they are updated on demand.
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*/
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static inline void update_mmu_cache(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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}
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#endif /* !__ASSEMBLY__ */
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/* MMU-specific headers */
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#ifdef CONFIG_SUN3
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#include <asm/sun3_pgtable.h>
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#elif defined(CONFIG_COLDFIRE)
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#include <asm/mcf_pgtable.h>
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#else
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#include <asm/motorola_pgtable.h>
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#endif
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#ifndef __ASSEMBLY__
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/*
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* Macro to mark a page protection value as "uncacheable".
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*/
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#ifdef CONFIG_COLDFIRE
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# define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE))
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#else
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#ifdef SUN3_PAGE_NOCACHE
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# define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE
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#else
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# define __SUN3_PAGE_NOCACHE 0
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#endif
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#define pgprot_noncached(prot) \
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(MMU_IS_SUN3 \
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? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \
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: ((MMU_IS_851 || MMU_IS_030) \
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? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \
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: (MMU_IS_040 || MMU_IS_060) \
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? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \
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: (prot)))
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pgprot_t pgprot_dmacoherent(pgprot_t prot);
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#define pgprot_dmacoherent(prot) pgprot_dmacoherent(prot)
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#endif /* CONFIG_COLDFIRE */
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#endif /* !__ASSEMBLY__ */
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#endif /* _M68K_PGTABLE_H */
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