WebSVN – HelenOS – Blame – /trunk/kernel/genarch/src/mm/as_pt.c

Rev	Author	Line No.	Line
756	jermar	1	/*
2071	jermar	2	* Copyright (c) 2006 Jakub Jermar
756	jermar	3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
1851	jermar	29	/** @addtogroup genarchmm
1702	cejka	30	* @{
		31	*/
		32
1266	jermar	33	/**
1702	cejka	34	* @file
1266	jermar	35	* @brief Address space functions for 4-level hierarchical pagetables.
		36	*/
		37
756	jermar	38	#include <genarch/mm/page_pt.h>
		39	#include <mm/page.h>
		40	#include <mm/frame.h>
		41	#include <mm/as.h>
1380	jermar	42	#include <synch/mutex.h>
756	jermar	43	#include <arch/mm/page.h>
		44	#include <arch/mm/as.h>
		45	#include <arch/types.h>
		46	#include <memstr.h>
		47	#include <arch.h>
		48
		49	static pte_t *ptl0_create(int flags);
1468	jermar	50	static void ptl0_destroy(pte_t *page_table);
756	jermar	51
1044	jermar	52	static void pt_lock(as_t *as, bool lock);
		53	static void pt_unlock(as_t *as, bool unlock);
		54
2125	decky	55	#ifdef __OBJC__
		56	@implementation as_t
		57
		58	+ (pte_t *) page_table_create: (int) flags
		59	{
		60	return ptl0_create(flags);
		61	}
		62
		63	+ (void) page_table_destroy: (pte_t *) page_table
		64	{
		65	ptl0_destroy(page_table);
		66	}
		67
		68	- (void) page_table_lock: (bool) _lock
		69	{
		70	pt_lock(self, _lock);
		71	}
		72
		73	- (void) page_table_unlock: (bool) unlock
		74	{
		75	pt_unlock(self, unlock);
		76	}
		77
		78	@end
		79	#else
756	jermar	80	as_operations_t as_pt_operations = {
1044	jermar	81	.page_table_create = ptl0_create,
1468	jermar	82	.page_table_destroy = ptl0_destroy,
1044	jermar	83	.page_table_lock = pt_lock,
		84	.page_table_unlock = pt_unlock
756	jermar	85	};
2125	decky	86	#endif
756	jermar	87
		88	/** Create PTL0.
		89	*
		90	* PTL0 of 4-level page table will be created for each address space.
		91	*
		92	* @param flags Flags can specify whether ptl0 is for the kernel address space.
		93	*
		94	* @return New PTL0.
		95	*/
		96	pte_t *ptl0_create(int flags)
		97	{
		98	pte_t src_ptl0, dst_ptl0;
		99	ipl_t ipl;
2465	jermar	100	int table_size;
756	jermar	101
2465	jermar	102	dst_ptl0 = (pte_t *) frame_alloc(PTL0_SIZE, FRAME_KA);
		103	table_size = FRAME_SIZE << PTL0_SIZE;
756	jermar	104
		105	if (flags & FLAG_AS_KERNEL) {
2465	jermar	106	memsetb((uintptr_t) dst_ptl0, table_size, 0);
756	jermar	107	} else {
1780	jermar	108	uintptr_t src, dst;
1059	jermar	109
756	jermar	110	/*
		111	* Copy the kernel address space portion to new PTL0.
		112	*/
		113
		114	ipl = interrupts_disable();
1380	jermar	115	mutex_lock(&AS_KERNEL->lock);
2106	jermar	116	src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);
1059	jermar	117
1780	jermar	118	src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
		119	dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
1059	jermar	120
2465	jermar	121	memsetb((uintptr_t) dst_ptl0, table_size, 0);
		122	memcpy((void ) dst, (void ) src, table_size - (src - (uintptr_t) src_ptl0));
1380	jermar	123	mutex_unlock(&AS_KERNEL->lock);
756	jermar	124	interrupts_restore(ipl);
		125	}
		126
1780	jermar	127	return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
756	jermar	128	}
1044	jermar	129
1468	jermar	130	/** Destroy page table.
		131	*
		132	* Destroy PTL0, other levels are expected to be already deallocated.
		133	*
		134	* @param page_table Physical address of PTL0.
		135	*/
		136	void ptl0_destroy(pte_t *page_table)
		137	{
1780	jermar	138	frame_free((uintptr_t)page_table);
1468	jermar	139	}
		140
1044	jermar	141	/** Lock page tables.
		142	*
		143	* Lock only the address space.
		144	* Interrupts must be disabled.
		145	*
		146	* @param as Address space.
		147	* @param lock If false, do not attempt to lock the address space.
		148	*/
		149	void pt_lock(as_t *as, bool lock)
		150	{
		151	if (lock)
1380	jermar	152	mutex_lock(&as->lock);
1044	jermar	153	}
		154
		155	/** Unlock page tables.
		156	*
		157	* Unlock the address space.
		158	* Interrupts must be disabled.
		159	*
		160	* @param as Address space.
		161	* @param unlock If false, do not attempt to unlock the address space.
		162	*/
		163	void pt_unlock(as_t *as, bool unlock)
		164	{
		165	if (unlock)
1380	jermar	166	mutex_unlock(&as->lock);
1044	jermar	167	}
1702	cejka	168
1851	jermar	169	/** @}
1702	cejka	170	*/

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(root)/trunk/kernel/genarch/src/mm/as_pt.c – Rev 2465