cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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tcg-gvec-desc.h (2103B)

      1/*
      2 * Generic vector operation descriptor
      3 *
      4 * Copyright (c) 2018 Linaro
      5 *
      6 * This library is free software; you can redistribute it and/or
      7 * modify it under the terms of the GNU Lesser General Public
      8 * License as published by the Free Software Foundation; either
      9 * version 2.1 of the License, or (at your option) any later version.
     10 *
     11 * This library is distributed in the hope that it will be useful,
     12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14 * Lesser General Public License for more details.
     15 *
     16 * You should have received a copy of the GNU Lesser General Public
     17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
     18 */
     19
     20#ifndef TCG_TCG_GVEC_DESC_H
     21#define TCG_TCG_GVEC_DESC_H
     22
     23/*
     24 * This configuration allows MAXSZ to represent 2048 bytes, and
     25 * OPRSZ to match MAXSZ, or represent the smaller values 8, 16, or 32.
     26 *
     27 * Encode this with:
     28 *   0, 1, 3 -> 8, 16, 32
     29 *   2       -> maxsz
     30 *
     31 * This steals the input that would otherwise map to 24 to match maxsz.
     32 */
     33#define SIMD_MAXSZ_SHIFT   0
     34#define SIMD_MAXSZ_BITS    8
     35
     36#define SIMD_OPRSZ_SHIFT   (SIMD_MAXSZ_SHIFT + SIMD_MAXSZ_BITS)
     37#define SIMD_OPRSZ_BITS    2
     38
     39#define SIMD_DATA_SHIFT    (SIMD_OPRSZ_SHIFT + SIMD_OPRSZ_BITS)
     40#define SIMD_DATA_BITS     (32 - SIMD_DATA_SHIFT)
     41
     42/* Create a descriptor from components.  */
     43uint32_t simd_desc(uint32_t oprsz, uint32_t maxsz, int32_t data);
     44
     45/* Extract the max vector size from a descriptor.  */
     46static inline intptr_t simd_maxsz(uint32_t desc)
     47{
     48    return extract32(desc, SIMD_MAXSZ_SHIFT, SIMD_MAXSZ_BITS) * 8 + 8;
     49}
     50
     51/* Extract the operation size from a descriptor.  */
     52static inline intptr_t simd_oprsz(uint32_t desc)
     53{
     54    uint32_t f = extract32(desc, SIMD_OPRSZ_SHIFT, SIMD_OPRSZ_BITS);
     55    intptr_t o = f * 8 + 8;
     56    intptr_t m = simd_maxsz(desc);
     57    return f == 2 ? m : o;
     58}
     59
     60/* Extract the operation-specific data from a descriptor.  */
     61static inline int32_t simd_data(uint32_t desc)
     62{
     63    return sextract32(desc, SIMD_DATA_SHIFT, SIMD_DATA_BITS);
     64}
     65
     66#endif