145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/* inthndlset.c - VxMicro interrupt management support for IA-32 arch */
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/*
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* Copyright (c) 2011-2014 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* DESCRIPTION
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* This module contains the irq_handler_set() API. This routine is closely
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* associated with irq_connect(), and any changes to the layout of the
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* constructed interrupt stub must be reflected in both places.
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*
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* INTERNAL
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* This routine is defined here, rather than in intconnect.c, so that it can be
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* omitted from a system image if it isn't required.
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*/
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#include <nanok.h>
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/* the _idt_base_address symbol is generated via a linker script */
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extern unsigned char _idt_base_address[];
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/*
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* The FIRST_OPT_OPCODE_OFF macro defines the offset of the first optional
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* opcode in an interrupt stub. Given that only the "call _IntEnt" is
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* mandatory, the subsequent instruction at offset 5 is "optional".
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*/
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#define FIRST_OPT_OPCODE_OFF 5
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/*******************************************************************************
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*
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* irq_handler_set - set the handler in an already connected stub
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*
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* This routine is used to modify an already fully constructed interrupt stub
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* to specify a new <routine> and/or <parameter>.
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*
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* WARNINGS:
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*
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* A fully constructed interrupt stub is generated via irq_connect(), i.e.
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* the irq_handler_set() function must only be called after invoking
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* irq_connect().
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*
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* The caller must ensure that the associated interrupt does not occur while
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* this routine is executing, otherwise race conditions may arise that could
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* cause the interrupt stub to invoke the handler using an incorrect routine
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* and/or parameter. If possible, silence the source of the associated interrupt
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* only, rather than locking out all interrupts.
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*
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* RETURNS: N/A
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*
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*/
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void irq_handler_set(unsigned int vector,
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void (*oldRoutine)(void *parameter),
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void (*newRoutine)(void *parameter),
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void *parameter)
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{
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unsigned int ix =
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FIRST_OPT_OPCODE_OFF; /* call _IntEnt is not optional */
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unsigned int *pIdtEntry;
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unsigned char *pIntStubMem;
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pIdtEntry = (unsigned int *)(_idt_base_address + (vector << 3));
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pIntStubMem = (unsigned char *)(((uint16_t)pIdtEntry[0]) |
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(pIdtEntry[1] & 0xffff0000));
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/*
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* Given the generation of the stub is dynamic, i.e. the invocations of
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* an EOI routine (with parameter) and/or BOI routine (with parameter)
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* are optional based on the requirements of the interrupt controller,
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* the <oldRoutine> parameter is used to quickly find the correct
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* bytes in the stub code to update.
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*/
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while (ix < _INT_STUB_SIZE) {
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/* locate the call opcode */
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if (pIntStubMem[ix] == IA32_CALL_OPCODE) {
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unsigned int opcodeOffToMatch;
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unsigned int opcodeOff;
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/* read the offset encoded in the call opcode */
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opcodeOff = UNALIGNED_READ(
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(unsigned int *)&pIntStubMem[ix + 1]);
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opcodeOffToMatch = (unsigned int)oldRoutine -
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(unsigned int)&pIntStubMem[ix + 5];
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/* does the encoded offset match <oldRoutine> ? */
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if (opcodeOff == opcodeOffToMatch) {
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/* match found -> write new routine and parameter */
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UNALIGNED_WRITE(
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(unsigned int *)&pIntStubMem[ix + 1],
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(unsigned int)newRoutine -
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(unsigned int)&pIntStubMem[ix +
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5]);
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UNALIGNED_WRITE(
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(unsigned int *)&pIntStubMem[ix - 4],
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(unsigned int)parameter);
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return; /* done */
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}
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}
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/* all instructions in the stub are 5 bytes long */
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ix += 5;
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}
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}
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