WebSVN – HelenOS – Blame – //trunk/kernel/arch/ia32/src/ddi/ddi.c

Rev	Author	Line No.	Line
1191	jermar	1	/*
2071	jermar	2	* Copyright (c) 2006 Jakub Jermar
1191	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>
1203	jermar	39	#include <adt/bitmap.h>
		40	#include <mm/slab.h>
		41	#include <arch/pm.h>
		42	#include <errno.h>
1212	palkovsky	43	#include <arch/cpu.h>
1256	jermar	44	#include <cpu.h>
		45	#include <arch.h>
1263	jermar	46	#include <align.h>
1191	jermar	47
		48	/** Enable I/O space range for task.
		49	*
		50	* Interrupts are disabled and task is locked.
		51	*
		52	* @param task Task.
		53	* @param ioaddr Startign I/O space address.
		54	* @param size Size of the enabled I/O range.
		55	*
		56	* @return 0 on success or an error code from errno.h.
		57	*/
1780	jermar	58	int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
1191	jermar	59	{
1203	jermar	60	count_t bits;
		61
		62	bits = ioaddr + size;
		63	if (bits > IO_PORTS)
		64	return ENOENT;
		65
		66	if (task->arch.iomap.bits < bits) {
		67	bitmap_t oldiomap;
1780	jermar	68	uint8_t *newmap;
1203	jermar	69
		70	/*
		71	* The I/O permission bitmap is too small and needs to be grown.
		72	*/
		73
1780	jermar	74	newmap = (uint8_t *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
1203	jermar	75	if (!newmap)
		76	return ENOMEM;
		77
2630	jermar	78	bitmap_initialize(&oldiomap, task->arch.iomap.map,
		79	task->arch.iomap.bits);
1203	jermar	80	bitmap_initialize(&task->arch.iomap, newmap, bits);
		81
		82	/*
		83	* Mark the new range inaccessible.
		84	*/
2630	jermar	85	bitmap_set_range(&task->arch.iomap, oldiomap.bits,
		86	bits - oldiomap.bits);
1203	jermar	87
		88	/*
		89	* In case there really existed smaller iomap,
		90	* copy its contents and deallocate it.
		91	*/
		92	if (oldiomap.bits) {
2630	jermar	93	bitmap_copy(&task->arch.iomap, &oldiomap,
		94	oldiomap.bits);
1203	jermar	95	free(oldiomap.map);
		96	}
		97	}
		98
		99	/*
		100	* Enable the range and we are done.
		101	*/
		102	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
		103
1256	jermar	104	/*
		105	* Increment I/O Permission bitmap generation counter.
		106	*/
		107	task->arch.iomapver++;
		108
1191	jermar	109	return 0;
		110	}
1212	palkovsky	111
1256	jermar	112	/** Install I/O Permission bitmap.
		113	*
		114	* Current task's I/O permission bitmap, if any, is installed
		115	* in the current CPU's TSS.
		116	*
		117	* Interrupts must be disabled prior this call.
		118	*/
		119	void io_perm_bitmap_install(void)
		120	{
		121	count_t bits;
		122	ptr_16_32_t cpugdtr;
		123	descriptor_t *gdt_p;
		124	count_t ver;
		125
		126	/* First, copy the I/O Permission Bitmap. */
		127	spinlock_lock(&TASK->lock);
		128	ver = TASK->arch.iomapver;
		129	if ((bits = TASK->arch.iomap.bits)) {
		130	bitmap_t iomap;
2441	decky	131	task_t *task = TASK;
1256	jermar	132
		133	ASSERT(TASK->arch.iomap.map);
2630	jermar	134	bitmap_initialize(&iomap, CPU->arch.tss->iomap,
		135	TSS_IOMAP_SIZE * 8);
2441	decky	136	bitmap_copy(&iomap, &task->arch.iomap, task->arch.iomap.bits);
1256	jermar	137	/*
2630	jermar	138	* It is safe to set the trailing eight bits because of the
		139	* extra convenience byte in TSS_IOMAP_SIZE.
1256	jermar	140	*/
1263	jermar	141	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
1256	jermar	142	}
		143	spinlock_unlock(&TASK->lock);
		144
1263	jermar	145	/*
		146	* Second, adjust TSS segment limit.
		147	* Take the extra ending byte with all bits set into account.
		148	*/
1256	jermar	149	gdtr_store(&cpugdtr);
		150	gdt_p = (descriptor_t *) cpugdtr.base;
1263	jermar	151	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
1256	jermar	152	gdtr_load(&cpugdtr);
		153
		154	/*
		155	* Before we load new TSS limit, the current TSS descriptor
		156	* type must be changed to describe inactive TSS.
		157	*/
		158	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;
		159	tr_load(selector(TSS_DES));
		160
		161	/*
		162	* Update the generation count so that faults caused by
		163	* early accesses can be serviced.
		164	*/
		165	CPU->arch.iomapver_copy = ver;
		166	}
1702	cejka	167
1731	jermar	168	/** @}
1702	cejka	169	*/

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