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 (the N flag, as it happens) 28 */ 29 #define BOOT_CPU_MODE_MISMATCH (1<<31) 30 31 #ifndef __ASSEMBLY__ 32 33 #ifdef CONFIG_ARM_VIRT_EXT 34 /* 35 * __boot_cpu_mode records what mode the primary CPU was booted in. 36 * A correctly-implemented bootloader must start all CPUs in the same mode: 37 * if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate 38 * that some CPU(s) were booted in a different mode. 39 * 40 * This allows the kernel to flag an error when the secondaries have come up. 41 */ 42 extern int __boot_cpu_mode; 43 44 void __hyp_set_vectors(unsigned long phys_vector_base); 45 unsigned long __hyp_get_vectors(void); 46 #else 47 #define __boot_cpu_mode (SVC_MODE) 48 #endif 49 50 #ifndef ZIMAGE 51 void hyp_mode_check(void); 52 53 /* Reports the availability of HYP mode */ 54 static inline bool is_hyp_mode_available(void) 55 { 56 return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE && 57 !(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH)); 58 } 59 60 /* Check if the bootloader has booted CPUs in different modes */ 61 static inline bool is_hyp_mode_mismatched(void) 62 { 63 return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH); 64 } 65 #endif 66 67 #endif /* __ASSEMBLY__ */ 68 69 #endif /* ! VIRT_H */ 70