95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
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/*
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Xtensa specific kernel interface header
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* This header contains the Xtensa specific kernel interface. It is included
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* by the generic kernel interface header (include/arch/cpu.h)
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*/
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#ifndef _ARCH_IFACE_H
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#define _ARCH_IFACE_H
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#include <irq.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(_ASMLANGUAGE) && !defined(__ASSEMBLER__)
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#include <stdint.h>
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#include <sw_isr_table.h>
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#include <arch/xtensa/xtensa_irq.h>
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#define STACK_ALIGN 16
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#define OCTET_TO_SIZEOFUNIT(X) (X)
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#define SIZEOFUNIT_TO_OCTET(X) (X)
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#define _NANO_ERR_HW_EXCEPTION (0) /* MPU/Bus/Usage fault */
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#define _NANO_ERR_INVALID_TASK_EXIT (1) /* Invalid task exit */
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#define _NANO_ERR_STACK_CHK_FAIL (2) /* Stack corruption detected */
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#define _NANO_ERR_ALLOCATION_FAIL (3) /* Kernel Allocation Failure */
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/* Xtensa GPRs are often designated by two different names */
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#define sys_define_gpr_with_alias(name1, name2) union { uint32_t name1, name2; }
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#include <arch/xtensa/exc.h>
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#define find_lsb_set __builtin_ffs
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#define find_msb_set __builtin_clz
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/* internal routine documented in C file, needed by IRQ_CONNECT() macro */
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extern void _irq_priority_set(uint32_t irq, uint32_t prio, uint32_t flags);
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/**
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* Configure a static interrupt.
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*
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* All arguments must be computable by the compiler at build time; if this
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* can't be done use irq_connect_dynamic() instead.
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*
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* Internally this function does a few things:
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*
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* 1. The enum statement has no effect but forces the compiler to only
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* accept constant values for the irq_p parameter, very important as the
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* numerical IRQ line is used to create a named section.
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*
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* 2. An instance of _isr_table_entry is created containing the ISR and its
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* parameter. If you look at how _sw_isr_table is created, each entry in the
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* array is in its own section named by the IRQ line number. What we are doing
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* here is to override one of the default entries (which points to the
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* spurious IRQ handler) with what was supplied here.
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*
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* 3. The priority level for the interrupt is configured by a call to
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* _irq_priority_set()
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*
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* @param irq_p IRQ line number
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* @param priority_p Interrupt priority
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* @param isr_p Interrupt service routine
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* @param isr_param_p ISR parameter
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* @param flags_p IRQ options
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*
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* @return The vector assigned to this interrupt
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*/
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#define _ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
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({ \
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enum { IRQ = irq_p }; \
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static struct _isr_table_entry \
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_CONCAT(_isr_irq, irq_p) \
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__attribute__ ((used)) \
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__attribute__ ((section(\
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STRINGIFY(_CONCAT(.gnu.linkonce.d.isr_irq, irq_p)))\
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)) = {isr_param_p, isr_p}; \
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_irq_priority_set(irq_p, priority_p, flags_p); \
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irq_p; \
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})
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#endif /* !defined(_ASMLANGUAGE) && !defined(__ASSEMBLER__) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ARCH_IFACE_H */
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