forked from Minki/linux
4e3c194480
During boot, we detect whether or not all CPUs are brought up in the same mode and signal this to the kernel using the N bit in the SPSR. This patch tidies up the checking code to use the PSR_N_BIT macro, rather than hardcoding the bit field and commenting it as such. Signed-off-by: Will Deacon <will.deacon@arm.com>
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2012 Linaro Limited.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#ifndef VIRT_H
|
|
#define VIRT_H
|
|
|
|
#include <asm/ptrace.h>
|
|
|
|
/*
|
|
* Flag indicating that the kernel was not entered in the same mode on every
|
|
* CPU. The zImage loader stashes this value in an SPSR, so we need an
|
|
* architecturally defined flag bit here.
|
|
*/
|
|
#define BOOT_CPU_MODE_MISMATCH PSR_N_BIT
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#ifdef CONFIG_ARM_VIRT_EXT
|
|
/*
|
|
* __boot_cpu_mode records what mode the primary CPU was booted in.
|
|
* A correctly-implemented bootloader must start all CPUs in the same mode:
|
|
* if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate
|
|
* that some CPU(s) were booted in a different mode.
|
|
*
|
|
* This allows the kernel to flag an error when the secondaries have come up.
|
|
*/
|
|
extern int __boot_cpu_mode;
|
|
|
|
void __hyp_set_vectors(unsigned long phys_vector_base);
|
|
unsigned long __hyp_get_vectors(void);
|
|
#else
|
|
#define __boot_cpu_mode (SVC_MODE)
|
|
#endif
|
|
|
|
#ifndef ZIMAGE
|
|
void hyp_mode_check(void);
|
|
|
|
/* Reports the availability of HYP mode */
|
|
static inline bool is_hyp_mode_available(void)
|
|
{
|
|
return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE &&
|
|
!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH));
|
|
}
|
|
|
|
/* Check if the bootloader has booted CPUs in different modes */
|
|
static inline bool is_hyp_mode_mismatched(void)
|
|
{
|
|
return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
|
|
}
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* ! VIRT_H */
|