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/*
 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_IRQFLAGS_ARCOMPACT_H
#define __ASM_IRQFLAGS_ARCOMPACT_H

/* vineetg: March 2010 : local_irq_save( ) optimisation
 *  -Remove explicit mov of current status32 into reg, that is not needed
 *  -Use BIC  insn instead of INVERTED + AND
 *  -Conditionally disable interrupts (if they are not enabled, don't disable)
*/

#include <asm/arcregs.h>

/* status32 Reg bits related to Interrupt Handling */
#define STATUS_E1_BIT		1	/* Int 1 enable */
#define STATUS_E2_BIT		2	/* Int 2 enable */
#define STATUS_A1_BIT		3	/* Int 1 active */
#define STATUS_A2_BIT		4	/* Int 2 active */
#define STATUS_AE_BIT		5	/* Exception active */

#define STATUS_E1_MASK		(1<<STATUS_E1_BIT)
#define STATUS_E2_MASK		(1<<STATUS_E2_BIT)
#define STATUS_A1_MASK		(1<<STATUS_A1_BIT)
#define STATUS_A2_MASK		(1<<STATUS_A2_BIT)
#define STATUS_AE_MASK		(1<<STATUS_AE_BIT)
#define STATUS_IE_MASK		(STATUS_E1_MASK | STATUS_E2_MASK)

/* Other Interrupt Handling related Aux regs */
#define AUX_IRQ_LEV		0x200	/* IRQ Priority: L1 or L2 */
#define AUX_IRQ_HINT		0x201	/* For generating Soft Interrupts */
#define AUX_IRQ_LV12		0x43	/* interrupt level register */

#define AUX_IENABLE		0x40c
#define AUX_ITRIGGER		0x40d
#define AUX_IPULSE		0x415

#define ISA_INIT_STATUS_BITS	STATUS_IE_MASK

#ifndef __ASSEMBLY__

/******************************************************************
 * IRQ Control Macros
 *
 * All of them have "memory" clobber (compiler barrier) which is needed to
 * ensure that LD/ST requiring irq safetly (R-M-W when LLSC is not available)
 * are redone after IRQs are re-enabled (and gcc doesn't reuse stale register)
 *
 * Noted at the time of Abilis Timer List corruption
 *	Orig Bug + Rejected solution	: https://lkml.org/lkml/2013/3/29/67
 *	Reasoning			: https://lkml.org/lkml/2013/4/8/15
 *
 ******************************************************************/

/*
 * Save IRQ state and disable IRQs
 */
static inline long arch_local_irq_save(void)
{
	unsigned long temp, flags;

	__asm__ __volatile__(
	"	lr  %1, [status32]	\n"
	"	bic %0, %1, %2		\n"
	"	and.f 0, %1, %2	\n"
	"	flag.nz %0		\n"
	: "=r"(temp), "=r"(flags)
	: "n"((STATUS_E1_MASK | STATUS_E2_MASK))
	: "memory", "cc");

	return flags;
}

/*
 * restore saved IRQ state
 */
static inline void arch_local_irq_restore(unsigned long flags)
{

	__asm__ __volatile__(
	"	flag %0			\n"
	:
	: "r"(flags)
	: "memory");
}

/*
 * Unconditionally Enable IRQs
 */
static inline void arch_local_irq_enable(void)
{
	unsigned long temp;

	__asm__ __volatile__(
	"	lr   %0, [status32]	\n"
	"	or   %0, %0, %1		\n"
	"	flag %0			\n"
	: "=&r"(temp)
	: "n"((STATUS_E1_MASK | STATUS_E2_MASK))
	: "cc", "memory");
}


/*
 * Unconditionally Disable IRQs
 */
static inline void arch_local_irq_disable(void)
{
	unsigned long temp;

	__asm__ __volatile__(
	"	lr  %0, [status32]	\n"
	"	and %0, %0, %1		\n"
	"	flag %0			\n"
	: "=&r"(temp)
	: "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))
	: "memory");
}

/*
 * save IRQ state
 */
static inline long arch_local_save_flags(void)
{
	unsigned long temp;

	__asm__ __volatile__(
	"	lr  %0, [status32]	\n"
	: "=&r"(temp)
	:
	: "memory");

	return temp;
}

/*
 * Query IRQ state
 */
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
	return !(flags & (STATUS_E1_MASK
#ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
			| STATUS_E2_MASK
#endif
		));
}

static inline int arch_irqs_disabled(void)
{
	return arch_irqs_disabled_flags(arch_local_save_flags());
}

#else

#ifdef CONFIG_TRACE_IRQFLAGS

.macro TRACE_ASM_IRQ_DISABLE
	bl	trace_hardirqs_off
.endm

.macro TRACE_ASM_IRQ_ENABLE
	bl	trace_hardirqs_on
.endm

#else

.macro TRACE_ASM_IRQ_DISABLE
.endm

.macro TRACE_ASM_IRQ_ENABLE
.endm

#endif

.macro IRQ_DISABLE  scratch
	lr	\scratch, [status32]
	bic	\scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
	flag	\scratch
	TRACE_ASM_IRQ_DISABLE
.endm

.macro IRQ_ENABLE  scratch
	TRACE_ASM_IRQ_ENABLE
	lr	\scratch, [status32]
	or	\scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
	flag	\scratch
.endm

#endif	/* __ASSEMBLY__ */

#endif

Filemanager

Name Type Size Permission Actions
Kbuild File 681 B 0644
arcregs.h File 8.59 KB 0644
asm-offsets.h File 311 B 0644
atomic.h File 15.14 KB 0644
barrier.h File 1.75 KB 0644
bitops.h File 9.81 KB 0644
bug.h File 938 B 0644
cache.h File 3.77 KB 0644
cacheflush.h File 3.88 KB 0644
checksum.h File 2.45 KB 0644
cmpxchg.h File 5.4 KB 0644
current.h File 695 B 0644
delay.h File 1.99 KB 0644
disasm.h File 3.87 KB 0644
dma-mapping.h File 734 B 0644
dma.h File 459 B 0644
dwarf.h File 892 B 0644
elf.h File 2.15 KB 0644
entry-arcv2.h File 4.85 KB 0644
entry-compact.h File 9.29 KB 0644
entry.h File 6.73 KB 0644
exec.h File 410 B 0644
fb.h File 411 B 0644
futex.h File 3.67 KB 0644
highmem.h File 1.46 KB 0644
hugepage.h File 2.41 KB 0644
io.h File 6.43 KB 0644
irq.h File 825 B 0644
irqflags-arcv2.h File 3.45 KB 0644
irqflags-compact.h File 4.25 KB 0644
irqflags.h File 509 B 0644
kdebug.h File 400 B 0644
kgdb.h File 1.35 KB 0644
kmap_types.h File 489 B 0644
kprobes.h File 1.37 KB 0644
linkage.h File 1.42 KB 0644
mach_desc.h File 2.06 KB 0644
mmu.h File 2.44 KB 0644
mmu_context.h File 5.67 KB 0644
mmzone.h File 989 B 0644
module.h File 661 B 0644
page.h File 2.99 KB 0644
pci.h File 705 B 0644
perf_event.h File 6.86 KB 0644
pgalloc.h File 3.79 KB 0644
pgtable.h File 14.2 KB 0644
processor.h File 4.69 KB 0644
ptrace.h File 3.87 KB 0644
sections.h File 407 B 0644
segment.h File 612 B 0644
serial.h File 644 B 0644
setup.h File 1.18 KB 0644
shmparam.h File 442 B 0644
smp.h File 4.25 KB 0644
spinlock.h File 8.79 KB 0644
spinlock_types.h File 1.03 KB 0644
stacktrace.h File 1.29 KB 0644
string.h File 1.15 KB 0644
switch_to.h File 1.17 KB 0644
syscall.h File 1.57 KB 0644
syscalls.h File 653 B 0644
thread_info.h File 3.39 KB 0644
timex.h File 508 B 0644
tlb-mmu1.h File 3.48 KB 0644
tlb.h File 1.23 KB 0644
tlbflush.h File 1.76 KB 0644
uaccess.h File 18.45 KB 0644
unaligned.h File 771 B 0644
unwind.h File 3.51 KB 0644