/*
* Copyright (c) 2007 Pavel Jancik, Michal Kebrt
* 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 arm32mm
* @{
*/
/** @file
*/
#include <arch/mm/page.h>
#include <genarch/mm/page_pt.h>
#include <mm/page.h>
#include <align.h>
#include <config.h>
#include <arch/exception.h>
#include <typedefs.h>
#include <arch/types.h>
#include <interrupt.h>
#include <arch/debug/print.h>
/**
* Initializes kernel adress space page tables, sets abourts exceptions vectors
*/
void page_arch_init(void)
{
uintptr_t cur;
int flags;
page_mapping_operations = &pt_mapping_operations;
flags = PAGE_CACHEABLE;
// PA2KA(identity) mapping for all frames until last_frame
for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
}
// create mapping for exception table at high offset
#ifdef HIGH_EXCEPTION_VECTORS
// Note: this mapping cann't be done by hw_map because fixed exception
// vector is stored at fixed virtual address
// reserve frame for exception table
void* virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
#endif
// TODO: #else
as_switch(NULL, AS_KERNEL);
}
/**
* Map device into kernel space.
*
* This function adds mapping of physical address that is read/write only
* from kernel and not bufferable.
*
* \param physaddr Physical addres where device is connected
* \param size Length of area where device is present
* \return Virtual address where device will be accessable
*/
uintptr_t hw_map(uintptr_t physaddr, size_t size)
{
if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
}
uintptr_t virtaddr = PA2KA(last_frame);
pfn_t i;
for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i),
PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
}
last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
return virtaddr;
}
/** @}
*/