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/*
* 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>
*
* 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.
*/
#include <asm/spr.h>
#include <asm/spr_defs.h>
#include <asm/cache.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
static __always_inline 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);
}
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