1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (c) 2012 Linaro Limited. 4 */ 5 6 #ifndef VIRT_H 7 #define VIRT_H 8 9 #include <asm/ptrace.h> 10 11 /* 12 * Flag indicating that the kernel was not entered in the same mode on every 13 * CPU. The zImage loader stashes this value in an SPSR, so we need an 14 * architecturally defined flag bit here. 15 */ 16 #define BOOT_CPU_MODE_MISMATCH PSR_N_BIT 17 18 #ifndef __ASSEMBLY__ 19 #include <asm/cacheflush.h> 20 21 #ifdef CONFIG_ARM_VIRT_EXT 22 /* 23 * __boot_cpu_mode records what mode the primary CPU was booted in. 24 * A correctly-implemented bootloader must start all CPUs in the same mode: 25 * if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate 26 * that some CPU(s) were booted in a different mode. 27 * 28 * This allows the kernel to flag an error when the secondaries have come up. 29 */ 30 extern int __boot_cpu_mode; 31 32 static inline void sync_boot_mode(void) 33 { 34 /* 35 * As secondaries write to __boot_cpu_mode with caches disabled, we 36 * must flush the corresponding cache entries to ensure the visibility 37 * of their writes. 38 */ 39 sync_cache_r(&__boot_cpu_mode); 40 } 41 42 void __hyp_set_vectors(unsigned long phys_vector_base); 43 void __hyp_reset_vectors(void); 44 #else 45 #define __boot_cpu_mode (SVC_MODE) 46 #define sync_boot_mode() 47 #endif 48 49 #ifndef ZIMAGE 50 void hyp_mode_check(void); 51 52 /* Reports the availability of HYP mode */ 53 static inline bool is_hyp_mode_available(void) 54 { 55 return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE && 56 !(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH)); 57 } 58 59 /* Check if the bootloader has booted CPUs in different modes */ 60 static inline bool is_hyp_mode_mismatched(void) 61 { 62 return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH); 63 } 64 65 static inline bool is_kernel_in_hyp_mode(void) 66 { 67 return false; 68 } 69 70 static inline bool has_vhe(void) 71 { 72 return false; 73 } 74 75 /* The section containing the hypervisor idmap text */ 76 extern char __hyp_idmap_text_start[]; 77 extern char __hyp_idmap_text_end[]; 78 79 /* The section containing the hypervisor text */ 80 extern char __hyp_text_start[]; 81 extern char __hyp_text_end[]; 82 #endif 83 84 #else 85 86 /* Only assembly code should need those */ 87 88 #define HVC_SET_VECTORS 0 89 #define HVC_SOFT_RESTART 1 90 #define HVC_RESET_VECTORS 2 91 92 #define HVC_STUB_HCALL_NR 3 93 94 #endif /* __ASSEMBLY__ */ 95 96 #define HVC_STUB_ERR 0xbadca11 97 98 #endif /* ! VIRT_H */ 99