include/arch/arc/arch.h

/*
 * Copyright (c) 2014 Wind River Systems, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file
 * @brief ARC specific nanokernel interface header
 *
 * This header contains the ARC specific nanokernel interface.  It is
 * included by the nanokernel interface architecture-abstraction header
 * (nanokernel/cpu.h)
 */

#ifndef _ARC_ARCH__H_
#define _ARC_ARCH__H_

#ifdef __cplusplus
extern "C" {
#endif

/* APIs need to support non-byte addressible architectures */

#define OCTET_TO_SIZEOFUNIT(X) (X)
#define SIZEOFUNIT_TO_OCTET(X) (X)

#include <sw_isr_table.h>
#ifdef CONFIG_CPU_ARCV2
#include <arch/arc/v2/exc.h>
#include <arch/arc/v2/irq.h>
#include <arch/arc/v2/ffs.h>
#include <arch/arc/v2/error.h>
#include <arch/arc/v2/misc.h>
#include <arch/arc/v2/aux_regs.h>
#include <arch/arc/v2/arcv2_irq_unit.h>
#include <arch/arc/v2/asm_inline.h>
#include <arch/arc/v2/addr_types.h>
#endif

#define STACK_ALIGN  4

#ifdef __cplusplus
}
#endif

#ifndef _ASMLANGUAGE
#include <irq.h>

/* internal routine documented in C file, needed by IRQ_CONNECT() macro */
extern void _irq_priority_set(unsigned int irq, unsigned int prio,
			      uint32_t flags);

/**
 * Configure a static interrupt.
 *
 * All arguments must be computable by the compiler at build time; if this
 * can't be done use irq_connect_dynamic() instead.
 *
 * Internally this function does a few things:
 *
 * 1. The enum statement has no effect but forces the compiler to only
 * accept constant values for the irq_p parameter, very important as the
 * numerical IRQ line is used to create a named section.
 *
 * 2. An instance of _IsrTableEntry is created containing the ISR and its
 * parameter. If you look at how _sw_isr_table is created, each entry in the
 * array is in its own section named by the IRQ line number. What we are doing
 * here is to override one of the default entries (which points to the
 * spurious IRQ handler) with what was supplied here.
 *
 * 3. The priority level for the interrupt is configured by a call to
 * _irq_priority_set()
 *
 * Supported flags:
 *
 *    IRQ_ZERO_LATENCY - Aka 'firqs'. Cannot make kernel calls due to
 *                       insufficent context being saved. priority_p argument
 *                       ignored.
 *    IRQ_NON_MASKABLE - These high-priority interrupts are not maked when
 *                       interrupts are locked system-wide. priority_p
 *                       argument ignored.
 *
 * @param irq_p IRQ line number
 * @param priority_p Interrupt priority, in range 0-13
 * @param isr_p Interrupt service routine
 * @param isr_param_p ISR parameter
 * @param flags_p IRQ options
 *
 * @return The vector assigned to this interrupt
 */
#define _ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
({ \
	enum { IRQ = irq_p }; \
	static struct _IsrTableEntry _CONCAT(_isr_irq, irq_p) \
		__attribute__ ((used))  \
		__attribute__ ((section(STRINGIFY(_CONCAT(.gnu.linkonce.isr_irq, irq_p))))) = \
			{isr_param_p, isr_p}; \
	_irq_priority_set(irq_p, priority_p, flags_p); \
	irq_p; \
})

#endif

#endif /* _ARC_ARCH__H_ */