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/* |
* 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 genarchmm |
* @{ |
*/ |
|
/** |
* @file |
* @brief Address space functions for 4-level hierarchical pagetables. |
*/ |
|
#include <genarch/mm/page_pt.h> |
#include <mm/page.h> |
#include <mm/frame.h> |
#include <mm/as.h> |
#include <synch/mutex.h> |
#include <arch/mm/page.h> |
#include <arch/mm/as.h> |
#include <arch/types.h> |
#include <memstr.h> |
#include <arch.h> |
|
static pte_t *ptl0_create(int flags); |
static void ptl0_destroy(pte_t *page_table); |
|
static void pt_lock(as_t *as, bool lock); |
static void pt_unlock(as_t *as, bool unlock); |
|
as_operations_t as_pt_operations = { |
.page_table_create = ptl0_create, |
.page_table_destroy = ptl0_destroy, |
.page_table_lock = pt_lock, |
.page_table_unlock = pt_unlock |
}; |
|
/** Create PTL0. |
* |
* PTL0 of 4-level page table will be created for each address space. |
* |
* @param flags Flags can specify whether ptl0 is for the kernel address space. |
* |
* @return New PTL0. |
*/ |
pte_t *ptl0_create(int flags) |
{ |
pte_t *src_ptl0, *dst_ptl0; |
ipl_t ipl; |
int table_size; |
|
dst_ptl0 = (pte_t *) frame_alloc(PTL0_SIZE, FRAME_KA); |
table_size = FRAME_SIZE << PTL0_SIZE; |
|
if (flags & FLAG_AS_KERNEL) { |
memsetb(dst_ptl0, table_size, 0); |
} else { |
uintptr_t src, dst; |
|
/* |
* Copy the kernel address space portion to new PTL0. |
*/ |
|
ipl = interrupts_disable(); |
mutex_lock(&AS_KERNEL->lock); |
src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table); |
|
src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
|
memsetb(dst_ptl0, table_size, 0); |
memcpy((void *) dst, (void *) src, table_size - (src - (uintptr_t) src_ptl0)); |
mutex_unlock(&AS_KERNEL->lock); |
interrupts_restore(ipl); |
} |
|
return (pte_t *) KA2PA((uintptr_t) dst_ptl0); |
} |
|
/** Destroy page table. |
* |
* Destroy PTL0, other levels are expected to be already deallocated. |
* |
* @param page_table Physical address of PTL0. |
*/ |
void ptl0_destroy(pte_t *page_table) |
{ |
frame_free((uintptr_t)page_table); |
} |
|
/** Lock page tables. |
* |
* Lock only the address space. |
* Interrupts must be disabled. |
* |
* @param as Address space. |
* @param lock If false, do not attempt to lock the address space. |
*/ |
void pt_lock(as_t *as, bool lock) |
{ |
if (lock) |
mutex_lock(&as->lock); |
} |
|
/** Unlock page tables. |
* |
* Unlock the address space. |
* Interrupts must be disabled. |
* |
* @param as Address space. |
* @param unlock If false, do not attempt to unlock the address space. |
*/ |
void pt_unlock(as_t *as, bool unlock) |
{ |
if (unlock) |
mutex_unlock(&as->lock); |
} |
|
/** @} |
*/ |