mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-04 09:34:12 +08:00
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>
122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* arch/arm/mm/highmem.c -- ARM highmem support
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: september 8, 2008
|
|
* Copyright: Marvell Semiconductors Inc.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include "mm.h"
|
|
|
|
static inline void set_fixmap_pte(int idx, pte_t pte)
|
|
{
|
|
unsigned long vaddr = __fix_to_virt(idx);
|
|
pte_t *ptep = virt_to_kpte(vaddr);
|
|
|
|
set_pte_ext(ptep, pte, 0);
|
|
local_flush_tlb_kernel_page(vaddr);
|
|
}
|
|
|
|
static inline pte_t get_fixmap_pte(unsigned long vaddr)
|
|
{
|
|
pte_t *ptep = virt_to_kpte(vaddr);
|
|
|
|
return *ptep;
|
|
}
|
|
|
|
void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
|
|
{
|
|
unsigned int idx;
|
|
unsigned long vaddr;
|
|
void *kmap;
|
|
int type;
|
|
|
|
#ifdef CONFIG_DEBUG_HIGHMEM
|
|
/*
|
|
* There is no cache coherency issue when non VIVT, so force the
|
|
* dedicated kmap usage for better debugging purposes in that case.
|
|
*/
|
|
if (!cache_is_vivt())
|
|
kmap = NULL;
|
|
else
|
|
#endif
|
|
kmap = kmap_high_get(page);
|
|
if (kmap)
|
|
return kmap;
|
|
|
|
type = kmap_atomic_idx_push();
|
|
|
|
idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
|
|
vaddr = __fix_to_virt(idx);
|
|
#ifdef CONFIG_DEBUG_HIGHMEM
|
|
/*
|
|
* With debugging enabled, kunmap_atomic forces that entry to 0.
|
|
* Make sure it was indeed properly unmapped.
|
|
*/
|
|
BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
|
|
#endif
|
|
/*
|
|
* When debugging is off, kunmap_atomic leaves the previous mapping
|
|
* in place, so the contained TLB flush ensures the TLB is updated
|
|
* with the new mapping.
|
|
*/
|
|
set_fixmap_pte(idx, mk_pte(page, prot));
|
|
|
|
return (void *)vaddr;
|
|
}
|
|
EXPORT_SYMBOL(kmap_atomic_high_prot);
|
|
|
|
void kunmap_atomic_high(void *kvaddr)
|
|
{
|
|
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
|
|
int idx, type;
|
|
|
|
if (kvaddr >= (void *)FIXADDR_START) {
|
|
type = kmap_atomic_idx();
|
|
idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
|
|
|
|
if (cache_is_vivt())
|
|
__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
|
|
#ifdef CONFIG_DEBUG_HIGHMEM
|
|
BUG_ON(vaddr != __fix_to_virt(idx));
|
|
set_fixmap_pte(idx, __pte(0));
|
|
#else
|
|
(void) idx; /* to kill a warning */
|
|
#endif
|
|
kmap_atomic_idx_pop();
|
|
} else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
|
|
/* this address was obtained through kmap_high_get() */
|
|
kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(kunmap_atomic_high);
|
|
|
|
void *kmap_atomic_pfn(unsigned long pfn)
|
|
{
|
|
unsigned long vaddr;
|
|
int idx, type;
|
|
struct page *page = pfn_to_page(pfn);
|
|
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
if (!PageHighMem(page))
|
|
return page_address(page);
|
|
|
|
type = kmap_atomic_idx_push();
|
|
idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
|
|
vaddr = __fix_to_virt(idx);
|
|
#ifdef CONFIG_DEBUG_HIGHMEM
|
|
BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
|
|
#endif
|
|
set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
|
|
|
|
return (void *)vaddr;
|
|
}
|