WebSVN – HelenOS – Blame – /trunk/kernel/arch/sparc64/src/mm/as.c/

Rev	Author	Line No.	Line
756	jermar	1	/*
		2	* Copyright (C) 2006 Jakub 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
1860	jermar	29	/** @addtogroup sparc64mm
1702	cejka	30	* @{
		31	*/
		32	/** @file
		33	*/
		34
756	jermar	35	#include <arch/mm/as.h>
1860	jermar	36	#include <arch/mm/tlb.h>
756	jermar	37	#include <genarch/mm/as_ht.h>
830	jermar	38	#include <genarch/mm/asid_fifo.h>
1890	jermar	39	#include <debug.h>
756	jermar	40
1890	jermar	41	#ifdef CONFIG_TSB
		42	#include <arch/mm/tsb.h>
		43	#endif
		44
756	jermar	45	/** Architecture dependent address space init. */
		46	void as_arch_init(void)
		47	{
		48	as_operations = &as_ht_operations;
830	jermar	49	asid_fifo_init();
756	jermar	50	}
1702	cejka	51
1890	jermar	52	/** Perform sparc64-specific tasks when an address space becomes active on the processor.
		53	*
		54	* Install ASID and map TSBs.
		55	*
		56	* @param as Address space.
		57	*/
1860	jermar	58	void as_install_arch(as_t *as)
		59	{
		60	tlb_context_reg_t ctx;
		61
		62	/*
1890	jermar	63	* Note that we don't lock the address space.
		64	* That's correct - we can afford it here
		65	* because we only read members that are
		66	* currently read-only.
		67	*/
		68
		69	/*
1860	jermar	70	* Write ASID to secondary context register.
		71	* The primary context register has to be set
		72	* from TL>0 so it will be filled from the
		73	* secondary context register from the TL=1
		74	* code just before switch to userspace.
		75	*/
		76	ctx.v = 0;
		77	ctx.context = as->asid;
		78	mmu_secondary_context_write(ctx.v);
1890	jermar	79
		80	#ifdef CONFIG_TSB
		81	if (as != AS_KERNEL) {
		82	uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
		83
		84	ASSERT(as->arch.itsb && as->arch.dtsb);
		85
		86	uintptr_t tsb = as->arch.itsb;
		87
		88	if (!overlaps(tsb, 8*PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
		89	/*
		90	* TSBs were allocated from memory not covered
		91	* by the locked 4M kernel DTLB entry. We need
		92	* to map both TSBs explicitly.
		93	*/
		94	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);
		95	dtlb_insert_mapping(tsb, KA2PA(tsb), PAGESIZE_64K, true, true);
		96	}
		97
		98	/*
		99	* Setup TSB Base registers.
		100	*/
		101	tsb_base_reg_t tsb_base;
		102
		103	tsb_base.value = 0;
		104	tsb_base.size = TSB_SIZE;
		105	tsb_base.split = 0;
		106
		107	tsb_base.base = as->arch.itsb >> PAGE_WIDTH;
		108	itsb_base_write(tsb_base.value);
		109	tsb_base.base = as->arch.dtsb >> PAGE_WIDTH;
		110	dtsb_base_write(tsb_base.value);
		111	}
		112	#endif
1860	jermar	113	}
		114
1890	jermar	115	/** Perform sparc64-specific tasks when an address space is removed from the processor.
		116	*
		117	* Demap TSBs.
		118	*
		119	* @param as Address space.
		120	*/
		121	void as_deinstall_arch(as_t *as)
		122	{
		123
		124	/*
		125	* Note that we don't lock the address space.
		126	* That's correct - we can afford it here
		127	* because we only read members that are
		128	* currently read-only.
		129	*/
		130
		131	#ifdef CONFIG_TSB
		132	if (as != AS_KERNEL) {
		133	uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);
		134
		135	ASSERT(as->arch.itsb && as->arch.dtsb);
		136
		137	uintptr_t tsb = as->arch.itsb;
		138
		139	if (!overlaps(tsb, 8*PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {
		140	/*
		141	* TSBs were allocated from memory not covered
		142	* by the locked 4M kernel DTLB entry. We need
		143	* to demap the entry installed by as_install_arch().
		144	*/
		145	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);
		146	}
		147
		148	}
		149	#endif
		150	}
		151
1860	jermar	152	/** @}
1702	cejka	153	*/

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