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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cache-sh3.c (2552B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * arch/sh/mm/cache-sh3.c
      4 *
      5 * Copyright (C) 1999, 2000  Niibe Yutaka
      6 * Copyright (C) 2002 Paul Mundt
      7 */
      8
      9#include <linux/init.h>
     10#include <linux/mman.h>
     11#include <linux/mm.h>
     12#include <linux/threads.h>
     13#include <asm/addrspace.h>
     14#include <asm/page.h>
     15#include <asm/processor.h>
     16#include <asm/cache.h>
     17#include <asm/io.h>
     18#include <linux/uaccess.h>
     19#include <asm/mmu_context.h>
     20#include <asm/cacheflush.h>
     21
     22/*
     23 * Write back the dirty D-caches, but not invalidate them.
     24 *
     25 * Is this really worth it, or should we just alias this routine
     26 * to __flush_purge_region too?
     27 *
     28 * START: Virtual Address (U0, P1, or P3)
     29 * SIZE: Size of the region.
     30 */
     31
     32static void sh3__flush_wback_region(void *start, int size)
     33{
     34	unsigned long v, j;
     35	unsigned long begin, end;
     36	unsigned long flags;
     37
     38	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
     39	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
     40		& ~(L1_CACHE_BYTES-1);
     41
     42	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
     43		unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
     44		for (j = 0; j < current_cpu_data.dcache.ways; j++) {
     45			unsigned long data, addr, p;
     46
     47			p = __pa(v);
     48			addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
     49			local_irq_save(flags);
     50			data = __raw_readl(addr);
     51
     52			if ((data & CACHE_PHYSADDR_MASK) ==
     53			    (p & CACHE_PHYSADDR_MASK)) {
     54				data &= ~SH_CACHE_UPDATED;
     55				__raw_writel(data, addr);
     56				local_irq_restore(flags);
     57				break;
     58			}
     59			local_irq_restore(flags);
     60			addrstart += current_cpu_data.dcache.way_incr;
     61		}
     62	}
     63}
     64
     65/*
     66 * Write back the dirty D-caches and invalidate them.
     67 *
     68 * START: Virtual Address (U0, P1, or P3)
     69 * SIZE: Size of the region.
     70 */
     71static void sh3__flush_purge_region(void *start, int size)
     72{
     73	unsigned long v;
     74	unsigned long begin, end;
     75
     76	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
     77	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
     78		& ~(L1_CACHE_BYTES-1);
     79
     80	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
     81		unsigned long data, addr;
     82
     83		data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
     84		addr = CACHE_OC_ADDRESS_ARRAY |
     85			(v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
     86		__raw_writel(data, addr);
     87	}
     88}
     89
     90void __init sh3_cache_init(void)
     91{
     92	__flush_wback_region = sh3__flush_wback_region;
     93	__flush_purge_region = sh3__flush_purge_region;
     94
     95	/*
     96	 * No write back please
     97	 *
     98	 * Except I don't think there's any way to avoid the writeback.
     99	 * So we just alias it to sh3__flush_purge_region(). dwmw2.
    100	 */
    101	__flush_invalidate_region = sh3__flush_purge_region;
    102}