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 #else 43 #define __boot_cpu_mode (SVC_MODE) 44 #define sync_boot_mode() 45 #endif 46 47 #ifndef ZIMAGE 48 void hyp_mode_check(void); 49 50 /* Reports the availability of HYP mode */ 51 static inline bool is_hyp_mode_available(void) 52 { 53 return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE && 54 !(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH)); 55 } 56 57 /* Check if the bootloader has booted CPUs in different modes */ 58 static inline bool is_hyp_mode_mismatched(void) 59 { 60 return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH); 61 } 62 63 static inline bool is_kernel_in_hyp_mode(void) 64 { 65 return false; 66 } 67 68 #endif 69 70 #else 71 72 /* Only assembly code should need those */ 73 74 #define HVC_SET_VECTORS 0 75 #define HVC_SOFT_RESTART 1 76 77 #endif /* __ASSEMBLY__ */ 78 79 #define HVC_STUB_ERR 0xbadca11 80 81 #endif /* ! VIRT_H */ 82