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);
|
||
|
|
}
|
||
|
|
|