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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test_encl.c (1444B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*  Copyright(c) 2016-20 Intel Corporation. */
      3
      4#include <stddef.h>
      5#include "defines.h"
      6
      7/*
      8 * Data buffer spanning two pages that will be placed first in .data
      9 * segment. Even if not used internally the second page is needed by
     10 * external test manipulating page permissions.
     11 */
     12static uint8_t encl_buffer[8192] = { 1 };
     13
     14static void *memcpy(void *dest, const void *src, size_t n)
     15{
     16	size_t i;
     17
     18	for (i = 0; i < n; i++)
     19		((char *)dest)[i] = ((char *)src)[i];
     20
     21	return dest;
     22}
     23
     24static void do_encl_op_put_to_buf(void *op)
     25{
     26	struct encl_op_put_to_buf *op2 = op;
     27
     28	memcpy(&encl_buffer[0], &op2->value, 8);
     29}
     30
     31static void do_encl_op_get_from_buf(void *op)
     32{
     33	struct encl_op_get_from_buf *op2 = op;
     34
     35	memcpy(&op2->value, &encl_buffer[0], 8);
     36}
     37
     38static void do_encl_op_put_to_addr(void *_op)
     39{
     40	struct encl_op_put_to_addr *op = _op;
     41
     42	memcpy((void *)op->addr, &op->value, 8);
     43}
     44
     45static void do_encl_op_get_from_addr(void *_op)
     46{
     47	struct encl_op_get_from_addr *op = _op;
     48
     49	memcpy(&op->value, (void *)op->addr, 8);
     50}
     51
     52static void do_encl_op_nop(void *_op)
     53{
     54
     55}
     56
     57void encl_body(void *rdi,  void *rsi)
     58{
     59	const void (*encl_op_array[ENCL_OP_MAX])(void *) = {
     60		do_encl_op_put_to_buf,
     61		do_encl_op_get_from_buf,
     62		do_encl_op_put_to_addr,
     63		do_encl_op_get_from_addr,
     64		do_encl_op_nop,
     65	};
     66
     67	struct encl_op_header *op = (struct encl_op_header *)rdi;
     68
     69	if (op->type < ENCL_OP_MAX)
     70		(*encl_op_array[op->type])(op);
     71}