diff options
Diffstat (limited to 'arch/openrisc/mm/cache.c')
| -rw-r--r-- | arch/openrisc/mm/cache.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/openrisc/mm/cache.c b/arch/openrisc/mm/cache.c new file mode 100644 index 000000000000..b747bf1fc1b6 --- /dev/null +++ b/arch/openrisc/mm/cache.c @@ -0,0 +1,61 @@ +/* + * 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 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); +} + |