1 /* 2 * Copyright (c) 2012 Linaro Limited. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 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 along 15 * with this program; if not, write to the Free Software Foundation, Inc., 16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 17 */ 18 19 #ifndef VIRT_H 20 #define VIRT_H 21 22 #include <asm/ptrace.h> 23 24 /* 25 * Flag indicating that the kernel was not entered in the same mode on every 26 * CPU. The zImage loader stashes this value in an SPSR, so we need an 27 * architecturally defined flag bit here. 28 */ 29 #define BOOT_CPU_MODE_MISMATCH PSR_N_BIT 30 31 #ifndef __ASSEMBLY__ 32 #include <asm/cacheflush.h> 33 34 #ifdef CONFIG_ARM_VIRT_EXT 35 /* 36 * __boot_cpu_mode records what mode the primary CPU was booted in. 37 * A correctly-implemented bootloader must start all CPUs in the same mode: 38 * if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate 39 * that some CPU(s) were booted in a different mode. 40 * 41 * This allows the kernel to flag an error when the secondaries have come up. 42 */ 43 extern int __boot_cpu_mode; 44 45 static inline void sync_boot_mode(void) 46 { 47 /* 48 * As secondaries write to __boot_cpu_mode with caches disabled, we 49 * must flush the corresponding cache entries to ensure the visibility 50 * of their writes. 51 */ 52 sync_cache_r(&__boot_cpu_mode); 53 } 54 55 void __hyp_set_vectors(unsigned long phys_vector_base); 56 unsigned long __hyp_get_vectors(void); 57 #else 58 #define __boot_cpu_mode (SVC_MODE) 59 #define sync_boot_mode() 60 #endif 61 62 #ifndef ZIMAGE 63 void hyp_mode_check(void); 64 65 /* Reports the availability of HYP mode */ 66 static inline bool is_hyp_mode_available(void) 67 { 68 return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE && 69 !(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH)); 70 } 71 72 /* Check if the bootloader has booted CPUs in different modes */ 73 static inline bool is_hyp_mode_mismatched(void) 74 { 75 return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH); 76 } 77 #endif 78 79 #endif /* __ASSEMBLY__ */ 80 81 #endif /* ! VIRT_H */ 82