forked from Minki/linux
41bd5b5d22
Remove the local_{async,fiq}_{en,dis}able macros as they don't respect
our newly defined order and are only used to set the flags for process
context when we bring CPUs online.
Add a helper to do this. The IRQ flag varies as we want it masked on
the boot CPU until we are ready to handle interrupts.
The boot CPU unmasks SError during early boot once it can print an error
message. If we can print an error message about SError, we can do the
same for FIQ. Debug exceptions are already enabled by __cpu_setup(),
which has also configured MDSCR_EL1 to disable MDE and KDE.
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* Copyright (C) 2017 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_DAIFFLAGS_H
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#define __ASM_DAIFFLAGS_H
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#include <linux/irqflags.h>
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#define DAIF_PROCCTX 0
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#define DAIF_PROCCTX_NOIRQ PSR_I_BIT
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/* mask/save/unmask/restore all exceptions, including interrupts. */
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static inline void local_daif_mask(void)
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{
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asm volatile(
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"msr daifset, #0xf // local_daif_mask\n"
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:
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:
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: "memory");
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trace_hardirqs_off();
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}
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static inline unsigned long local_daif_save(void)
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{
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unsigned long flags;
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asm volatile(
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"mrs %0, daif // local_daif_save\n"
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: "=r" (flags)
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:
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: "memory");
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local_daif_mask();
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return flags;
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}
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static inline void local_daif_unmask(void)
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{
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trace_hardirqs_on();
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asm volatile(
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"msr daifclr, #0xf // local_daif_unmask"
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:
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:
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: "memory");
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}
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static inline void local_daif_restore(unsigned long flags)
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{
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if (!arch_irqs_disabled_flags(flags))
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trace_hardirqs_on();
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asm volatile(
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"msr daif, %0 // local_daif_restore"
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:
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: "r" (flags)
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: "memory");
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if (arch_irqs_disabled_flags(flags))
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trace_hardirqs_off();
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}
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#endif
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