arch/common/isr_tables.c

/*
 * Copyright (c) 2017 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <toolchain.h>
#include <linker/sections.h>
#include <sw_isr_table.h>
#include <arch/cpu.h>

/* There is an additional member at the end populated by the linker script
 * which indicates the number of interrupts specified
 */
struct int_list_header {
	u32_t table_size;
	u32_t offset;
};

/* These values are not included in the resulting binary, but instead form the
 * header of the initList section, which is used by gen_isr_tables.py to create
 * the vector and sw isr tables,
 */
Z_GENERIC_SECTION(.irq_info) struct int_list_header _iheader = {
	.table_size = IRQ_TABLE_SIZE,
	.offset = CONFIG_GEN_IRQ_START_VECTOR,
};

/* These are placeholder tables. They will be replaced by the real tables
 * generated by gen_isr_tables.py.
 *
 * z_irq_spurious and _isr_wrapper are used as placeholder values to
 * ensure that they are not optimized out in the first link. The first
 * link must contain the same symbols as the second one for the code
 * generation to work.
 */

/* Some arches don't use a vector table, they have a common exception entry
 * point for all interrupts. Don't generate a table in this case.
 */
#ifdef CONFIG_GEN_IRQ_VECTOR_TABLE
u32_t __irq_vector_table _irq_vector_table[IRQ_TABLE_SIZE] = {
	[0 ...(IRQ_TABLE_SIZE - 1)] = (u32_t)&_isr_wrapper,
};
#endif

/* If there are no interrupts at all, or all interrupts are of the 'direct'
 * type and bypass the _sw_isr_table, then do not generate one.
 */
#ifdef CONFIG_GEN_SW_ISR_TABLE
struct _isr_table_entry __sw_isr_table _sw_isr_table[IRQ_TABLE_SIZE] = {
	[0 ...(IRQ_TABLE_SIZE - 1)] = {(void *)0x42, (void *)&z_irq_spurious},
};
#endif