WebSVN – HelenOS – Blame – /trunk/kernel/arch/amd64/src/ddi/ddi.c

Rev	Author	Line No.	Line
1191	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
1702	cejka	29	/** @addtogroup amd64ddi amd64
		30	* @ingroup ddi
		31	* @{
		32	*/
		33	/** @file
		34	*/
		35
1191	jermar	36	#include <ddi/ddi.h>
1256	jermar	37	#include <arch/ddi/ddi.h>
1191	jermar	38	#include <proc/task.h>
		39	#include <arch/types.h>
		40	#include <typedefs.h>
1203	jermar	41	#include <adt/bitmap.h>
		42	#include <mm/slab.h>
		43	#include <arch/pm.h>
		44	#include <errno.h>
1212	palkovsky	45	#include <arch/cpu.h>
1256	jermar	46	#include <arch.h>
1263	jermar	47	#include <align.h>
1191	jermar	48
		49	/** Enable I/O space range for task.
		50	*
		51	* Interrupts are disabled and task is locked.
		52	*
		53	* @param task Task.
		54	* @param ioaddr Startign I/O space address.
		55	* @param size Size of the enabled I/O range.
		56	*
		57	* @return 0 on success or an error code from errno.h.
		58	*/
1227	jermar	59	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
1191	jermar	60	{
1203	jermar	61	count_t bits;
		62
		63	bits = ioaddr + size;
		64	if (bits > IO_PORTS)
		65	return ENOENT;
		66
		67	if (task->arch.iomap.bits < bits) {
		68	bitmap_t oldiomap;
		69	__u8 *newmap;
		70
		71	/*
		72	* The I/O permission bitmap is too small and needs to be grown.
		73	*/
		74
		75	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
		76	if (!newmap)
		77	return ENOMEM;
		78
		79	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
		80	bitmap_initialize(&task->arch.iomap, newmap, bits);
		81
		82	/*
		83	* Mark the new range inaccessible.
		84	*/
		85	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
		86
		87	/*
		88	* In case there really existed smaller iomap,
		89	* copy its contents and deallocate it.
		90	*/
		91	if (oldiomap.bits) {
1261	jermar	92	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
1203	jermar	93	free(oldiomap.map);
		94	}
		95	}
		96
		97	/*
		98	* Enable the range and we are done.
		99	*/
		100	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
		101
1256	jermar	102	/*
		103	* Increment I/O Permission bitmap generation counter.
		104	*/
		105	task->arch.iomapver++;
		106
1191	jermar	107	return 0;
		108	}
1212	palkovsky	109
1256	jermar	110	/** Install I/O Permission bitmap.
		111	*
		112	* Current task's I/O permission bitmap, if any, is installed
		113	* in the current CPU's TSS.
		114	*
		115	* Interrupts must be disabled prior this call.
		116	*/
		117	void io_perm_bitmap_install(void)
		118	{
		119	count_t bits;
		120	ptr_16_64_t cpugdtr;
		121	descriptor_t *gdt_p;
		122	tss_descriptor_t *tss_desc;
		123	count_t ver;
		124
		125	/* First, copy the I/O Permission Bitmap. */
		126	spinlock_lock(&TASK->lock);
		127	ver = TASK->arch.iomapver;
		128	if ((bits = TASK->arch.iomap.bits)) {
		129	bitmap_t iomap;
		130
		131	ASSERT(TASK->arch.iomap.map);
		132	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
		133	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
		134	/*
		135	* It is safe to set the trailing eight bits because of the extra
		136	* convenience byte in TSS_IOMAP_SIZE.
		137	*/
1263	jermar	138	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
1256	jermar	139	}
		140	spinlock_unlock(&TASK->lock);
		141
1263	jermar	142	/*
		143	* Second, adjust TSS segment limit.
		144	* Take the extra ending byte will all bits set into account.
		145	*/
1256	jermar	146	gdtr_store(&cpugdtr);
		147	gdt_p = (descriptor_t *) cpugdtr.base;
1263	jermar	148	gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
1256	jermar	149	gdtr_load(&cpugdtr);
		150
		151	/*
		152	* Before we load new TSS limit, the current TSS descriptor
		153	* type must be changed to describe inactive TSS.
		154	*/
		155	tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES];
		156	tss_desc->type = AR_TSS;
		157	tr_load(gdtselector(TSS_DES));
		158
		159	/*
		160	* Update the generation count so that faults caused by
		161	* early accesses can be serviced.
		162	*/
		163	CPU->arch.iomapver_copy = ver;
		164	}
1702	cejka	165
		166	/** @}
		167	*/
		168

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