bsd-user/aarch64/target_arch_vmparam.h

   1 /*
   2  * ARM AArch64 VM parameters definitions for bsd-user.
   3  *
   4  * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
   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 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 TARGET_ARCH_VMPARAM_H
  21 #define TARGET_ARCH_VMPARAM_H
  22
  23 #include "cpu.h"
  24
  25 /**
  26  * FreeBSD/arm64 Address space layout.
  27  *
  28  * ARMv8 implements up to a 48 bit virtual address space. The address space is
  29  * split into 2 regions at each end of the 64 bit address space, with an
  30  * out of range "hole" in the middle.
  31  *
  32  * We limit the size of the two spaces to 39 bits each.
  33  *
  34  * Upper region:        0xffffffffffffffff
  35  *                      0xffffff8000000000
  36  *
  37  * Hole:                0xffffff7fffffffff
  38  *                      0x0000008000000000
  39  *
  40  * Lower region:        0x0000007fffffffff
  41  *                      0x0000000000000000
  42  *
  43  * The upper region for the kernel, and the lower region for userland.
  44  */
  45
  46
  47 /* compare to sys/arm64/include/vmparam.h */
  48 #define TARGET_MAXTSIZ      (1 * GiB)           /* max text size */
  49 #define TARGET_DFLDSIZ      (128 * MiB)         /* initial data size limit */
  50 #define TARGET_MAXDSIZ      (1 * GiB)           /* max data size */
  51 #define TARGET_DFLSSIZ      (128 * MiB)         /* initial stack size limit */
  52 #define TARGET_MAXSSIZ      (1 * GiB)           /* max stack size */
  53 #define TARGET_SGROWSIZ     (128 * KiB)         /* amount to grow stack */
  54
  55                 /* KERNBASE - 512 MB */
  56 #define TARGET_VM_MAXUSER_ADDRESS   (0x00007fffff000000ULL - (512 * MiB))
  57 #define TARGET_USRSTACK             TARGET_VM_MAXUSER_ADDRESS
  58
  59 static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
  60 {
  61     return state->xregs[31]; /* sp */
  62 }
  63
  64 static inline void set_second_rval(CPUARMState *state, abi_ulong retval2)
  65 {
  66     state->xregs[1] = retval2; /* XXX not really used on 64-bit arch */
  67 }
  68
  69 static inline abi_ulong get_second_rval(CPUARMState *state)
  70 {
  71     return state->xregs[1];
  72 }
  73
  74 #endif /* TARGET_ARCH_VMPARAM_H */