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 #include <asm/cpufeature.h>
  51
  52 /*
  53  * __boot_cpu_mode records what mode CPUs were booted in.
  54  * A correctly-implemented bootloader must start all CPUs in the same mode:
  55  * In this case, both 32bit halves of __boot_cpu_mode will contain the
  56  * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
  57  *
  58  * Should the bootloader fail to do this, the two values will be different.
  59  * This allows the kernel to flag an error when the secondaries have come up.
  60  */
  61 extern u32 __boot_cpu_mode[2];
  62
  63 void __hyp_set_vectors(phys_addr_t phys_vector_base);
  64 phys_addr_t __hyp_get_vectors(void);
  65
  66 /* Reports the availability of HYP mode */
  67 static inline bool is_hyp_mode_available(void)
  68 {
  69         return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
  70                 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
  71 }
  72
  73 /* Check if the bootloader has booted CPUs in different modes */
  74 static inline bool is_hyp_mode_mismatched(void)
  75 {
  76         return __boot_cpu_mode[0] != __boot_cpu_mode[1];
  77 }
  78
  79 static inline bool is_kernel_in_hyp_mode(void)
  80 {
  81         return read_sysreg(CurrentEL) == CurrentEL_EL2;
  82 }
  83
  84 static inline bool has_vhe(void)
  85 {
  86         if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN))
  87                 return true;
  88
  89         return false;
  90 }
  91
  92 #ifdef CONFIG_ARM64_VHE
  93 extern void verify_cpu_run_el(void);
  94 #else
  95 static inline void verify_cpu_run_el(void) {}
  96 #endif
  97
  98 #endif /* __ASSEMBLY__ */
  99
 100 #endif /* ! __ASM__VIRT_H */