WebSVN – HelenOS-historic – Blame – /kernel/trunk/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
		29	#include <ddi/ddi.h>
1256	jermar	30	#include <arch/ddi/ddi.h>
1191	jermar	31	#include <proc/task.h>
		32	#include <arch/types.h>
		33	#include <typedefs.h>
1203	jermar	34	#include <adt/bitmap.h>
		35	#include <mm/slab.h>
		36	#include <arch/pm.h>
		37	#include <errno.h>
1212	palkovsky	38	#include <arch/cpu.h>
1256	jermar	39	#include <arch.h>
1191	jermar	40
		41	/** Enable I/O space range for task.
		42	*
		43	* Interrupts are disabled and task is locked.
		44	*
		45	* @param task Task.
		46	* @param ioaddr Startign I/O space address.
		47	* @param size Size of the enabled I/O range.
		48	*
		49	* @return 0 on success or an error code from errno.h.
		50	*/
1227	jermar	51	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
1191	jermar	52	{
1203	jermar	53	count_t bits;
		54
		55	bits = ioaddr + size;
		56	if (bits > IO_PORTS)
		57	return ENOENT;
		58
		59	if (task->arch.iomap.bits < bits) {
		60	bitmap_t oldiomap;
		61	__u8 *newmap;
		62
		63	/*
		64	* The I/O permission bitmap is too small and needs to be grown.
		65	*/
		66
		67	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
		68	if (!newmap)
		69	return ENOMEM;
		70
		71	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
		72	bitmap_initialize(&task->arch.iomap, newmap, bits);
		73
		74	/*
		75	* Mark the new range inaccessible.
		76	*/
		77	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
		78
		79	/*
		80	* In case there really existed smaller iomap,
		81	* copy its contents and deallocate it.
		82	*/
		83	if (oldiomap.bits) {
		84	bitmap_copy(&task->arch.iomap, &oldiomap, task->arch.iomap.bits);
		85	free(oldiomap.map);
		86	}
		87	}
		88
		89	/*
		90	* Enable the range and we are done.
		91	*/
		92	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
		93
1256	jermar	94	/*
		95	* Increment I/O Permission bitmap generation counter.
		96	*/
		97	task->arch.iomapver++;
		98
1191	jermar	99	return 0;
		100	}
1212	palkovsky	101
		102	/** Enable/disable interrupts form syscall
		103	*
		104	* @param enable If non-zero, interrupts are enabled, otherwise disabled
1223	jermar	105	* @param flags RFLAGS register
1212	palkovsky	106	*/
		107	__native ddi_int_control_arch(__native enable, __native *flags)
		108	{
		109	if (enable)
		110	*flags \|= RFLAGS_IF;
		111	else
		112	*flags &= ~RFLAGS_IF;
		113	return 0;
		114	}
1256	jermar	115
		116	/** Install I/O Permission bitmap.
		117	*
		118	* Current task's I/O permission bitmap, if any, is installed
		119	* in the current CPU's TSS.
		120	*
		121	* Interrupts must be disabled prior this call.
		122	*/
		123	void io_perm_bitmap_install(void)
		124	{
		125	count_t bits;
		126	ptr_16_64_t cpugdtr;
		127	descriptor_t *gdt_p;
		128	tss_descriptor_t *tss_desc;
		129	count_t ver;
		130
		131	/* First, copy the I/O Permission Bitmap. */
		132	spinlock_lock(&TASK->lock);
		133	ver = TASK->arch.iomapver;
		134	if ((bits = TASK->arch.iomap.bits)) {
		135	bitmap_t iomap;
		136
		137	ASSERT(TASK->arch.iomap.map);
		138	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
		139	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
		140	/*
		141	* It is safe to set the trailing eight bits because of the extra
		142	* convenience byte in TSS_IOMAP_SIZE.
		143	*/
		144	bitmap_set_range(&iomap, TASK->arch.iomap.bits, 8);
		145	}
		146	spinlock_unlock(&TASK->lock);
		147
		148	/* Second, adjust TSS segment limit. */
		149	gdtr_store(&cpugdtr);
		150	gdt_p = (descriptor_t *) cpugdtr.base;
		151	gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1);
		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	tss_desc = (tss_descriptor_t *) &gdt_p[TSS_DES];
		159	tss_desc->type = AR_TSS;
		160	tr_load(gdtselector(TSS_DES));
		161
		162	/*
		163	* Update the generation count so that faults caused by
		164	* early accesses can be serviced.
		165	*/
		166	CPU->arch.iomapver_copy = ver;
		167	}

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