include/exec/cpu-defs.h

   1 /*
   2  * common defines for all CPUs
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   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 #ifndef CPU_DEFS_H
  20 #define CPU_DEFS_H
  21
  22 #ifndef NEED_CPU_H
  23 #error cpu.h included from common code
  24 #endif
  25
  26 #include "qemu/host-utils.h"
  27 #include "qemu/thread.h"
  28 #ifndef CONFIG_USER_ONLY
  29 #include "exec/hwaddr.h"
  30 #endif
  31 #include "exec/memattrs.h"
  32 #include "hw/core/cpu.h"
  33
  34 #include "cpu-param.h"
  35
  36 #ifndef TARGET_LONG_BITS
  37 # error TARGET_LONG_BITS must be defined in cpu-param.h
  38 #endif
  39 #ifndef TARGET_PHYS_ADDR_SPACE_BITS
  40 # error TARGET_PHYS_ADDR_SPACE_BITS must be defined in cpu-param.h
  41 #endif
  42 #ifndef TARGET_VIRT_ADDR_SPACE_BITS
  43 # error TARGET_VIRT_ADDR_SPACE_BITS must be defined in cpu-param.h
  44 #endif
  45 #ifndef TARGET_PAGE_BITS
  46 # ifdef TARGET_PAGE_BITS_VARY
  47 #  ifndef TARGET_PAGE_BITS_MIN
  48 #   error TARGET_PAGE_BITS_MIN must be defined in cpu-param.h
  49 #  endif
  50 # else
  51 #  error TARGET_PAGE_BITS must be defined in cpu-param.h
  52 # endif
  53 #endif
  54
  55 #include "exec/target_long.h"
  56
  57 #if defined(CONFIG_SOFTMMU) && defined(CONFIG_TCG)
  58 #define CPU_TLB_DYN_MIN_BITS 6
  59 #define CPU_TLB_DYN_DEFAULT_BITS 8
  60
  61 # if HOST_LONG_BITS == 32
  62 /* Make sure we do not require a double-word shift for the TLB load */
  63 #  define CPU_TLB_DYN_MAX_BITS (32 - TARGET_PAGE_BITS)
  64 # else /* HOST_LONG_BITS == 64 */
  65 /*
  66  * Assuming TARGET_PAGE_BITS==12, with 2**22 entries we can cover 2**(22+12) ==
  67  * 2**34 == 16G of address space. This is roughly what one would expect a
  68  * TLB to cover in a modern (as of 2018) x86_64 CPU. For instance, Intel
  69  * Skylake's Level-2 STLB has 16 1G entries.
  70  * Also, make sure we do not size the TLB past the guest's address space.
  71  */
  72 #  ifdef TARGET_PAGE_BITS_VARY
  73 #   define CPU_TLB_DYN_MAX_BITS                                  \
  74     MIN(22, TARGET_VIRT_ADDR_SPACE_BITS - TARGET_PAGE_BITS)
  75 #  else
  76 #   define CPU_TLB_DYN_MAX_BITS                                  \
  77     MIN_CONST(22, TARGET_VIRT_ADDR_SPACE_BITS - TARGET_PAGE_BITS)
  78 #  endif
  79 # endif
  80
  81 #endif /* CONFIG_SOFTMMU && CONFIG_TCG */
  82
  83 #endif