/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup kernel_amd64_ddi
* @{
*/
/** @file
*/
#include <ddi/ddi.h>
#include <arch/ddi/ddi.h>
#include <proc/task.h>
#include <typedefs.h>
#include <adt/bitmap.h>
#include <stdlib.h>
#include <arch/pm.h>
#include <errno.h>
#include <arch/cpu.h>
#include <cpu.h>
#include <arch.h>
#include <align.h>
/** Enable I/O space range for task.
*
* Interrupts are disabled and task is locked.
*
* @param task Task.
* @param ioaddr Starting I/O space address.
* @param size Size of the enabled I/O range.
*
* @return EOK on success or an error code from errno.h.
*
*/
errno_t ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
{
size_t elements = ioaddr + size;
if (elements > IO_PORTS)
return ENOENT;
if (task->arch.iomap.elements < elements) {
/*
* The I/O permission bitmap is too small and needs to be grown.
*/
void *store = malloc(bitmap_size(elements));
if (!store)
return ENOMEM;
bitmap_t oldiomap;
bitmap_initialize(&oldiomap, task->arch.iomap.elements,
task->arch.iomap.bits);
bitmap_initialize(&task->arch.iomap, elements, store);
/*
* Mark the new range inaccessible.
*/
bitmap_set_range(&task->arch.iomap, oldiomap.elements,
elements - oldiomap.elements);
/*
* In case there really existed smaller iomap,
* copy its contents and deallocate it.
*/
if (oldiomap.bits) {
bitmap_copy(&task->arch.iomap, &oldiomap,
oldiomap.elements);
free(oldiomap.bits);
}
}
/*
* Enable the range and we are done.
*/
bitmap_clear_range(&task->arch.iomap, (size_t) ioaddr, size);
/*
* Increment I/O Permission bitmap generation counter.
*/
task->arch.iomapver++;
return EOK;
}
/** Disable I/O space range for task.
*
* Interrupts are disabled and task is locked.
*
* @param task Task.
* @param ioaddr Starting I/O space address.
* @param size Size of the enabled I/O range.
*
* @return EOK on success or an error code from errno.h.
*
*/
errno_t ddi_iospace_disable_arch(task_t *task, uintptr_t ioaddr, size_t size)
{
size_t elements = ioaddr + size;
if (elements > IO_PORTS)
return ENOENT;
if (ioaddr >= task->arch.iomap.elements)
return EINVAL;
if (task->arch.iomap.elements < elements)
size -= elements - task->arch.iomap.elements;
/*
* Disable the range.
*/
bitmap_set_range(&task->arch.iomap, (size_t) ioaddr, size);
/*
* Increment I/O Permission bitmap generation counter.
*/
task->arch.iomapver++;
return 0;
}
/** @}
*/