mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-30 15:44:13 +08:00
2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* OpenRISC cache.c
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* Modifications for the OpenRISC architecture:
|
|
* Copyright (C) 2015 Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
|
|
*/
|
|
|
|
#include <asm/spr.h>
|
|
#include <asm/spr_defs.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
static void cache_loop(struct page *page, const unsigned int reg)
|
|
{
|
|
unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT;
|
|
unsigned long line = paddr & ~(L1_CACHE_BYTES - 1);
|
|
|
|
while (line < paddr + PAGE_SIZE) {
|
|
mtspr(reg, line);
|
|
line += L1_CACHE_BYTES;
|
|
}
|
|
}
|
|
|
|
void local_dcache_page_flush(struct page *page)
|
|
{
|
|
cache_loop(page, SPR_DCBFR);
|
|
}
|
|
EXPORT_SYMBOL(local_dcache_page_flush);
|
|
|
|
void local_icache_page_inv(struct page *page)
|
|
{
|
|
cache_loop(page, SPR_ICBIR);
|
|
}
|
|
EXPORT_SYMBOL(local_icache_page_inv);
|
|
|
|
void update_cache(struct vm_area_struct *vma, unsigned long address,
|
|
pte_t *pte)
|
|
{
|
|
unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT;
|
|
struct page *page = pfn_to_page(pfn);
|
|
int dirty = !test_and_set_bit(PG_dc_clean, &page->flags);
|
|
|
|
/*
|
|
* Since icaches do not snoop for updated data on OpenRISC, we
|
|
* must write back and invalidate any dirty pages manually. We
|
|
* can skip data pages, since they will not end up in icaches.
|
|
*/
|
|
if ((vma->vm_flags & VM_EXEC) && dirty)
|
|
sync_icache_dcache(page);
|
|
}
|
|
|