arch/arm64/include/asm/sysreg.h

   1 /*
   2  * Macros for accessing system registers with older binutils.
   3  *
   4  * Copyright (C) 2014 ARM Ltd.
   5  * Author: Catalin Marinas <catalin.marinas@arm.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef __ASM_SYSREG_H
  21 #define __ASM_SYSREG_H
  22
  23 #include <asm/opcodes.h>
  24
  25 #define SCTLR_EL1_CP15BEN       (0x1 << 5)
  26 #define SCTLR_EL1_SED           (0x1 << 8)
  27
  28 /*
  29  * ARMv8 ARM reserves the following encoding for system registers:
  30  * (Ref: ARMv8 ARM, Section: "System instruction class encoding overview",
  31  *  C5.2, version:ARM DDI 0487A.f)
  32  *      [20-19] : Op0
  33  *      [18-16] : Op1
  34  *      [15-12] : CRn
  35  *      [11-8]  : CRm
  36  *      [7-5]   : Op2
  37  */
  38 #define sys_reg(op0, op1, crn, crm, op2) \
  39         ((((op0)&3)<<19)|((op1)<<16)|((crn)<<12)|((crm)<<8)|((op2)<<5))
  40
  41 #define REG_PSTATE_PAN_IMM                     sys_reg(0, 0, 4, 0, 4)
  42 #define SCTLR_EL1_SPAN                         (1 << 23)
  43
  44 #define SET_PSTATE_PAN(x) __inst_arm(0xd5000000 | REG_PSTATE_PAN_IMM |\
  45                                      (!!x)<<8 | 0x1f)
  46
  47 #ifdef __ASSEMBLY__
  48
  49         .irp    num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
  50         .equ    __reg_num_x\num, \num
  51         .endr
  52         .equ    __reg_num_xzr, 31
  53
  54         .macro  mrs_s, rt, sreg
  55         .inst   0xd5200000|(\sreg)|(__reg_num_\rt)
  56         .endm
  57
  58         .macro  msr_s, sreg, rt
  59         .inst   0xd5000000|(\sreg)|(__reg_num_\rt)
  60         .endm
  61
  62 #else
  63
  64 asm(
  65 "       .irp    num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
  66 "       .equ    __reg_num_x\\num, \\num\n"
  67 "       .endr\n"
  68 "       .equ    __reg_num_xzr, 31\n"
  69 "\n"
  70 "       .macro  mrs_s, rt, sreg\n"
  71 "       .inst   0xd5200000|(\\sreg)|(__reg_num_\\rt)\n"
  72 "       .endm\n"
  73 "\n"
  74 "       .macro  msr_s, sreg, rt\n"
  75 "       .inst   0xd5000000|(\\sreg)|(__reg_num_\\rt)\n"
  76 "       .endm\n"
  77 );
  78
  79 static inline void config_sctlr_el1(u32 clear, u32 set)
  80 {
  81         u32 val;
  82
  83         asm volatile("mrs %0, sctlr_el1" : "=r" (val));
  84         val &= ~clear;
  85         val |= set;
  86         asm volatile("msr sctlr_el1, %0" : : "r" (val));
  87 }
  88 #endif
  89
  90 #endif  /* __ASM_SYSREG_H */