cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cacheflush.c (1344B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
      3
      4#include <linux/kernel.h>
      5#include <linux/mm.h>
      6#include <linux/fs.h>
      7#include <linux/pagemap.h>
      8#include <linux/syscalls.h>
      9#include <linux/spinlock.h>
     10#include <asm/page.h>
     11#include <asm/cache.h>
     12#include <asm/cacheflush.h>
     13#include <asm/cachectl.h>
     14
     15#define PG_dcache_clean		PG_arch_1
     16
     17void flush_dcache_page(struct page *page)
     18{
     19	struct address_space *mapping;
     20
     21	if (page == ZERO_PAGE(0))
     22		return;
     23
     24	mapping = page_mapping_file(page);
     25
     26	if (mapping && !page_mapcount(page))
     27		clear_bit(PG_dcache_clean, &page->flags);
     28	else {
     29		dcache_wbinv_all();
     30		if (mapping)
     31			icache_inv_all();
     32		set_bit(PG_dcache_clean, &page->flags);
     33	}
     34}
     35EXPORT_SYMBOL(flush_dcache_page);
     36
     37void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
     38	pte_t *ptep)
     39{
     40	unsigned long pfn = pte_pfn(*ptep);
     41	struct page *page;
     42
     43	if (!pfn_valid(pfn))
     44		return;
     45
     46	page = pfn_to_page(pfn);
     47	if (page == ZERO_PAGE(0))
     48		return;
     49
     50	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
     51		dcache_wbinv_all();
     52
     53	if (page_mapping_file(page)) {
     54		if (vma->vm_flags & VM_EXEC)
     55			icache_inv_all();
     56	}
     57}
     58
     59void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
     60	unsigned long end)
     61{
     62	dcache_wbinv_all();
     63
     64	if (vma->vm_flags & VM_EXEC)
     65		icache_inv_all();
     66}