1927b3d020
This is a new mechanism for generating interrupt tables which will
be useful on many architectures. It replaces the old linker-based
mechanism for creating these tables and has a couple advantages:
1) It is now possible to use enums as the IRQ line argument to
IRQ_CONNECT(), which should ease CMSIS integration.
2) The vector table itself is now generated, which lets us place
interrupts directly into the vector table without having to
hard-code them. This is a feature we have long enjoyed on x86
and will enable 'direct' interrupts.
3) More code is common, requiring less arch-specific code to
support.
This patch introduces the common code for this mechanism. Follow-up
patches will enable it on various arches.
Issue: ZEP-1038, ZEP-1165
Change-Id: I9acd6e0de8b438fa9293f2e00563628f7510168a
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
53 lines
1.6 KiB
Text
53 lines
1.6 KiB
Text
/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* This creates a special section which is not included by the final binary,
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* instead it is consumed by the gen_isr_tables.py script.
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*
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* What we create here is a data structure:
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*
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* struct {
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* void *spurious_irq_handler;
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* void *sw_irq_handler;
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* uint32_t num_isrs;
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* uint32_t num_vectors;
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* struct _isr_list isrs[]; <- of size num_isrs
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* }
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*
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* Which indicates the memory address of the spurious IRQ handler and the
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* number of isrs that were defined, the total number of IRQ lines in the
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* system, followed by an appropriate number of instances of
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* struct _isr_list. See include/sw_isr_table.h
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*
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* You will need to declare a bogus memory region for IDT_LIST. It doesn't
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* matter where this region goes as it is stripped from the final ELF image.
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* The address doesn't even have to be valid on the target. However, it
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* shouldn't overlap any other regions. On most arches the following should be
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* fine:
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*
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* MEMORY {
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* .. other regions ..
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* IDT_LIST : ORIGIN = 0xfffff7ff, LENGTH = 2K
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* }
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*/
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/* We don't set NOLOAD here, as objcopy will not let us extract the intList
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* section into a file if we do so; the resulting file is 0 bytes. We do so
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* with objcopy in Makefile.gen_isr_tables after we have extracted the
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* information we need.
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*/
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SECTION_PROLOGUE(.intList,,)
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{
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KEEP(*(.irq.spurious))
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KEEP(*(.irq.handler))
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LONG((__INT_LIST_END__ - __INT_LIST_START__) / __ISR_LIST_SIZEOF)
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KEEP(*(.irq.tablesize))
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__INT_LIST_START__ = .;
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KEEP(*(.intList))
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__INT_LIST_END__ = .;
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} GROUP_LINK_IN(IDT_LIST)
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