virt.h (1855B)
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 */ 30extern int __boot_cpu_mode; 31 32static 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 48void hyp_mode_check(void); 49 50/* Reports the availability of HYP mode */ 51static 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 */ 58static inline bool is_hyp_mode_mismatched(void) 59{ 60 return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH); 61} 62 63static 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 */