WebSVN – HelenOS-historic – Blame – /kernel/trunk/arch/ia32/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
1731	jermar	29	/** @addtogroup ia32ddi
1702	cejka	30	* @{
		31	*/
		32	/** @file
		33	*/
		34
1191	jermar	35	#include <ddi/ddi.h>
1256	jermar	36	#include <arch/ddi/ddi.h>
1191	jermar	37	#include <proc/task.h>
		38	#include <arch/types.h>
		39	#include <typedefs.h>
1203	jermar	40	#include <adt/bitmap.h>
		41	#include <mm/slab.h>
		42	#include <arch/pm.h>
		43	#include <errno.h>
1212	palkovsky	44	#include <arch/cpu.h>
1256	jermar	45	#include <cpu.h>
		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_32_t cpugdtr;
		121	descriptor_t *gdt_p;
		122	count_t ver;
		123
		124	/* First, copy the I/O Permission Bitmap. */
		125	spinlock_lock(&TASK->lock);
		126	ver = TASK->arch.iomapver;
		127	if ((bits = TASK->arch.iomap.bits)) {
		128	bitmap_t iomap;
		129
		130	ASSERT(TASK->arch.iomap.map);
		131	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
		132	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
		133	/*
		134	* It is safe to set the trailing eight bits because of the extra
		135	* convenience byte in TSS_IOMAP_SIZE.
		136	*/
1263	jermar	137	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
1256	jermar	138	}
		139	spinlock_unlock(&TASK->lock);
		140
1263	jermar	141	/*
		142	* Second, adjust TSS segment limit.
		143	* Take the extra ending byte with all bits set into account.
		144	*/
1256	jermar	145	gdtr_store(&cpugdtr);
		146	gdt_p = (descriptor_t *) cpugdtr.base;
1263	jermar	147	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
1256	jermar	148	gdtr_load(&cpugdtr);
		149
		150	/*
		151	* Before we load new TSS limit, the current TSS descriptor
		152	* type must be changed to describe inactive TSS.
		153	*/
		154	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;
		155	tr_load(selector(TSS_DES));
		156
		157	/*
		158	* Update the generation count so that faults caused by
		159	* early accesses can be serviced.
		160	*/
		161	CPU->arch.iomapver_copy = ver;
		162	}
1702	cejka	163
1731	jermar	164	/** @}
1702	cejka	165	*/

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