LXR linux/arch/arm64/include/asm/virt.h

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 * Author: Marc Zyngier <marc.zyngier@arm.com>
   4 *
   5 * This program is free software: you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18#ifndef __ASM__VIRT_H
  19#define __ASM__VIRT_H
  20
  21/*
  22 * The arm64 hcall implementation uses x0 to specify the hcall type. A value
  23 * less than 0xfff indicates a special hcall, such as get/set vector.
  24 * Any other value is used as a pointer to the function to call.
  25 */
  26
  27/* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */
  28#define HVC_GET_VECTORS 0
  29
  30/*
  31 * HVC_SET_VECTORS - Set the value of the vbar_el2 register.
  32 *
  33 * @x1: Physical address of the new vector table.
  34 */
  35#define HVC_SET_VECTORS 1
  36
  37/*
  38 * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
  39 */
  40#define HVC_SOFT_RESTART 2
  41
  42#define BOOT_CPU_MODE_EL1       (0xe11)
  43#define BOOT_CPU_MODE_EL2       (0xe12)
  44
  45#ifndef __ASSEMBLY__
  46
  47#include <asm/ptrace.h>
  48#include <asm/sections.h>
  49#include <asm/sysreg.h>
  50
  51/*
  52 * __boot_cpu_mode records what mode CPUs were booted in.
  53 * A correctly-implemented bootloader must start all CPUs in the same mode:
  54 * In this case, both 32bit halves of __boot_cpu_mode will contain the
  55 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
  56 *
  57 * Should the bootloader fail to do this, the two values will be different.
  58 * This allows the kernel to flag an error when the secondaries have come up.
  59 */
  60extern u32 __boot_cpu_mode[2];
  61
  62void __hyp_set_vectors(phys_addr_t phys_vector_base);
  63phys_addr_t __hyp_get_vectors(void);
  64
  65/* Reports the availability of HYP mode */
  66static inline bool is_hyp_mode_available(void)
  67{
  68        return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
  69                __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
  70}
  71
  72/* Check if the bootloader has booted CPUs in different modes */
  73static inline bool is_hyp_mode_mismatched(void)
  74{
  75        return __boot_cpu_mode[0] != __boot_cpu_mode[1];
  76}
  77
  78static inline bool is_kernel_in_hyp_mode(void)
  79{
  80        return read_sysreg(CurrentEL) == CurrentEL_EL2;
  81}
  82
  83#ifdef CONFIG_ARM64_VHE
  84extern void verify_cpu_run_el(void);
  85#else
  86static inline void verify_cpu_run_el(void) {}
  87#endif
  88
  89#endif /* __ASSEMBLY__ */
  90
  91#endif /* ! __ASM__VIRT_H */
  92