target/alpha/cpu-param.h

   1 /*
   2  * Alpha cpu parameters for qemu.
   3  *
   4  * Copyright (c) 2007 Jocelyn Mayer
   5  * SPDX-License-Identifier: LGPL-2.0+
   6  */
   7
   8 #ifndef ALPHA_CPU_PARAM_H
   9 #define ALPHA_CPU_PARAM_H 1
  10
  11 #define TARGET_LONG_BITS 64
  12 #define TARGET_PAGE_BITS 13
  13 #ifdef CONFIG_USER_ONLY
  14 /*
  15  * ??? The kernel likes to give addresses in high memory.  If the host has
  16  * more virtual address space than the guest, this can lead to impossible
  17  * allocations.  Honor the long-standing assumption that only kernel addrs
  18  * are negative, but otherwise allow allocations anywhere.  This could lead
  19  * to tricky emulation problems for programs doing tagged addressing, but
  20  * that's far fewer than encounter the impossible allocation problem.
  21  */
  22 #define TARGET_PHYS_ADDR_SPACE_BITS  63
  23 #define TARGET_VIRT_ADDR_SPACE_BITS  63
  24 #else
  25 /* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44.  */
  26 #define TARGET_PHYS_ADDR_SPACE_BITS  44
  27 #define TARGET_VIRT_ADDR_SPACE_BITS  (30 + TARGET_PAGE_BITS)
  28 #endif
  29 #define NB_MMU_MODES 3
  30
  31 #endif