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e05c7b1f2b
The powerpc 32-bit implementation of pgtable has nice shortcuts for accessing kernel PMD and PTE for a given virtual address. Make these helpers available for all architectures. [rppt@linux.ibm.com: microblaze: fix page table traversal in setup_rt_frame()] Link: http://lkml.kernel.org/r/20200518191511.GD1118872@kernel.org [akpm@linux-foundation.org: s/pmd_ptr_k/pmd_off_k/ in various powerpc places] Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> 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: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-9-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/arm/mm/highmem.c -- ARM highmem support
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*
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* Author: Nicolas Pitre
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* Created: september 8, 2008
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* Copyright: Marvell Semiconductors Inc.
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*/
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <linux/interrupt.h>
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#include <asm/fixmap.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include "mm.h"
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static inline void set_fixmap_pte(int idx, pte_t pte)
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{
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unsigned long vaddr = __fix_to_virt(idx);
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pte_t *ptep = virt_to_kpte(vaddr);
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set_pte_ext(ptep, pte, 0);
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local_flush_tlb_kernel_page(vaddr);
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}
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static inline pte_t get_fixmap_pte(unsigned long vaddr)
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{
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pte_t *ptep = virt_to_kpte(vaddr);
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return *ptep;
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}
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void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
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{
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unsigned int idx;
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unsigned long vaddr;
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void *kmap;
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int type;
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#ifdef CONFIG_DEBUG_HIGHMEM
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/*
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* There is no cache coherency issue when non VIVT, so force the
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* dedicated kmap usage for better debugging purposes in that case.
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*/
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if (!cache_is_vivt())
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kmap = NULL;
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else
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#endif
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kmap = kmap_high_get(page);
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if (kmap)
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return kmap;
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type = kmap_atomic_idx_push();
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idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
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vaddr = __fix_to_virt(idx);
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#ifdef CONFIG_DEBUG_HIGHMEM
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/*
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* With debugging enabled, kunmap_atomic forces that entry to 0.
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* Make sure it was indeed properly unmapped.
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*/
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BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
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#endif
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/*
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* When debugging is off, kunmap_atomic leaves the previous mapping
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* in place, so the contained TLB flush ensures the TLB is updated
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* with the new mapping.
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*/
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set_fixmap_pte(idx, mk_pte(page, prot));
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return (void *)vaddr;
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}
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EXPORT_SYMBOL(kmap_atomic_high_prot);
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void kunmap_atomic_high(void *kvaddr)
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{
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unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
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int idx, type;
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if (kvaddr >= (void *)FIXADDR_START) {
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type = kmap_atomic_idx();
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idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
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if (cache_is_vivt())
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__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
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#ifdef CONFIG_DEBUG_HIGHMEM
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BUG_ON(vaddr != __fix_to_virt(idx));
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set_fixmap_pte(idx, __pte(0));
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#else
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(void) idx; /* to kill a warning */
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#endif
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kmap_atomic_idx_pop();
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} else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
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/* this address was obtained through kmap_high_get() */
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kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
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}
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}
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EXPORT_SYMBOL(kunmap_atomic_high);
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void *kmap_atomic_pfn(unsigned long pfn)
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{
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unsigned long vaddr;
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int idx, type;
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struct page *page = pfn_to_page(pfn);
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preempt_disable();
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pagefault_disable();
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if (!PageHighMem(page))
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return page_address(page);
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type = kmap_atomic_idx_push();
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idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
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vaddr = __fix_to_virt(idx);
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#ifdef CONFIG_DEBUG_HIGHMEM
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BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
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#endif
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set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
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return (void *)vaddr;
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}
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