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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 <typedefs.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; |
| |
| dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA); |
| |
| if (flags & FLAG_AS_KERNEL) { |
| memsetb((uintptr_t) dst_ptl0, PAGE_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->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((uintptr_t) dst_ptl0, PAGE_SIZE, 0); |
| memcpy((void *) dst, (void *) src, PAGE_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); |
| } |
| |
| /** @} |
| */ |
| |