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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pmem.c (2512B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright(c) 2017 IBM Corporation. All rights reserved.
      4 */
      5
      6#include <linux/string.h>
      7#include <linux/export.h>
      8#include <linux/uaccess.h>
      9#include <linux/libnvdimm.h>
     10
     11#include <asm/cacheflush.h>
     12
     13static inline void __clean_pmem_range(unsigned long start, unsigned long stop)
     14{
     15	unsigned long shift = l1_dcache_shift();
     16	unsigned long bytes = l1_dcache_bytes();
     17	void *addr = (void *)(start & ~(bytes - 1));
     18	unsigned long size = stop - (unsigned long)addr + (bytes - 1);
     19	unsigned long i;
     20
     21	for (i = 0; i < size >> shift; i++, addr += bytes)
     22		asm volatile(PPC_DCBSTPS(%0, %1): :"i"(0), "r"(addr): "memory");
     23}
     24
     25static inline void __flush_pmem_range(unsigned long start, unsigned long stop)
     26{
     27	unsigned long shift = l1_dcache_shift();
     28	unsigned long bytes = l1_dcache_bytes();
     29	void *addr = (void *)(start & ~(bytes - 1));
     30	unsigned long size = stop - (unsigned long)addr + (bytes - 1);
     31	unsigned long i;
     32
     33	for (i = 0; i < size >> shift; i++, addr += bytes)
     34		asm volatile(PPC_DCBFPS(%0, %1): :"i"(0), "r"(addr): "memory");
     35}
     36
     37static inline void clean_pmem_range(unsigned long start, unsigned long stop)
     38{
     39	if (cpu_has_feature(CPU_FTR_ARCH_207S))
     40		return __clean_pmem_range(start, stop);
     41}
     42
     43static inline void flush_pmem_range(unsigned long start, unsigned long stop)
     44{
     45	if (cpu_has_feature(CPU_FTR_ARCH_207S))
     46		return __flush_pmem_range(start, stop);
     47}
     48
     49/*
     50 * CONFIG_ARCH_HAS_PMEM_API symbols
     51 */
     52void arch_wb_cache_pmem(void *addr, size_t size)
     53{
     54	unsigned long start = (unsigned long) addr;
     55	clean_pmem_range(start, start + size);
     56}
     57EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
     58
     59void arch_invalidate_pmem(void *addr, size_t size)
     60{
     61	unsigned long start = (unsigned long) addr;
     62	flush_pmem_range(start, start + size);
     63}
     64EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
     65
     66/*
     67 * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
     68 */
     69long __copy_from_user_flushcache(void *dest, const void __user *src,
     70		unsigned size)
     71{
     72	unsigned long copied, start = (unsigned long) dest;
     73
     74	copied = __copy_from_user(dest, src, size);
     75	clean_pmem_range(start, start + size);
     76
     77	return copied;
     78}
     79
     80void memcpy_flushcache(void *dest, const void *src, size_t size)
     81{
     82	unsigned long start = (unsigned long) dest;
     83
     84	memcpy(dest, src, size);
     85	clean_pmem_range(start, start + size);
     86}
     87EXPORT_SYMBOL(memcpy_flushcache);
     88
     89void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
     90	size_t len)
     91{
     92	memcpy_flushcache(to, page_to_virt(page) + offset, len);
     93}
     94EXPORT_SYMBOL(memcpy_page_flushcache);