WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/src/ddi/ddi.c


/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 /** @addtogroup ia32ddi
 
 * @{
 */
/** @file
 */
 
#include <ddi/ddi.h>
#include <arch/ddi/ddi.h>
#include <proc/task.h>
#include <arch/types.h>
#include <typedefs.h>
#include <adt/bitmap.h>
#include <mm/slab.h>
#include <arch/pm.h>
#include <errno.h>
#include <arch/cpu.h>
#include <cpu.h>
#include <arch.h>
#include <align.h>
 
/** Enable I/O space range for task.
 *
 * Interrupts are disabled and task is locked.
 *
 * @param task Task.
 * @param ioaddr Startign I/O space address.
 * @param size Size of the enabled I/O range.
 *
 * @return 0 on success or an error code from errno.h.
 */
int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
{
    count_t bits;
 
    bits = ioaddr + size;
    if (bits > IO_PORTS)
        return ENOENT;
 
    if (task->arch.iomap.bits < bits) {
        bitmap_t oldiomap;
        __u8 *newmap;
   
        /*
         * The I/O permission bitmap is too small and needs to be grown.
         */
       
        newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
        if (!newmap)
            return ENOMEM;
       
        bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
        bitmap_initialize(&task->arch.iomap, newmap, bits);
 
        /*
         * Mark the new range inaccessible.
         */
        bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
 
        /*
         * In case there really existed smaller iomap,
         * copy its contents and deallocate it.
         */    
        if (oldiomap.bits) {
            bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
            free(oldiomap.map);
        }
    }
 
    /*
     * Enable the range and we are done.
     */
    bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
 
    /*
     * Increment I/O Permission bitmap generation counter.
     */
    task->arch.iomapver++;
 
    return 0;
}
 
/** Install I/O Permission bitmap.
 *
 * Current task's I/O permission bitmap, if any, is installed
 * in the current CPU's TSS.
 *
 * Interrupts must be disabled prior this call.
 */
void io_perm_bitmap_install(void)
{
    count_t bits;
    ptr_16_32_t cpugdtr;
    descriptor_t *gdt_p;
    count_t ver;
 
    /* First, copy the I/O Permission Bitmap. */
    spinlock_lock(&TASK->lock);
    ver = TASK->arch.iomapver;
    if ((bits = TASK->arch.iomap.bits)) {
        bitmap_t iomap;
   
        ASSERT(TASK->arch.iomap.map);
        bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
        bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
        /*
         * It is safe to set the trailing eight bits because of the extra
         * convenience byte in TSS_IOMAP_SIZE.
         */
        bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
    }
    spinlock_unlock(&TASK->lock);
 
    /*
     * Second, adjust TSS segment limit.
     * Take the extra ending byte with all bits set into account.
     */
    gdtr_store(&cpugdtr);
    gdt_p = (descriptor_t *) cpugdtr.base;
    gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
    gdtr_load(&cpugdtr);
 
    /*
     * Before we load new TSS limit, the current TSS descriptor
     * type must be changed to describe inactive TSS.
     */
    gdt_p[TSS_DES].access = AR_PRESENT | AR_TSS | DPL_KERNEL;
    tr_load(selector(TSS_DES));
   
    /*
     * Update the generation count so that faults caused by
     * early accesses can be serviced.
     */
    CPU->arch.iomapver_copy = ver;
}
 
 /** @}
 */
 
 

Rev 1702	Rev 1705
1	/*	1	/*
2	* Copyright (C) 2006 Jakub Jermar	2	* Copyright (C) 2006 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ia32ddi ia32	29	/** @addtogroup ia32ddi
30	* @ingroup ddi	-
31	* @{	30	* @{
32	*/	31	*/
33	/** @file	32	/** @file
34	*/	33	*/
35		34
36	#include <ddi/ddi.h>	35	#include <ddi/ddi.h>
37	#include <arch/ddi/ddi.h>	36	#include <arch/ddi/ddi.h>
38	#include <proc/task.h>	37	#include <proc/task.h>
39	#include <arch/types.h>	38	#include <arch/types.h>
40	#include <typedefs.h>	39	#include <typedefs.h>
41	#include <adt/bitmap.h>	40	#include <adt/bitmap.h>
42	#include <mm/slab.h>	41	#include <mm/slab.h>
43	#include <arch/pm.h>	42	#include <arch/pm.h>
44	#include <errno.h>	43	#include <errno.h>
45	#include <arch/cpu.h>	44	#include <arch/cpu.h>
46	#include <cpu.h>	45	#include <cpu.h>
47	#include <arch.h>	46	#include <arch.h>
48	#include <align.h>	47	#include <align.h>
49		48
50	/** Enable I/O space range for task.	49	/** Enable I/O space range for task.
51	*	50	*
52	* Interrupts are disabled and task is locked.	51	* Interrupts are disabled and task is locked.
53	*	52	*
54	* @param task Task.	53	* @param task Task.
55	* @param ioaddr Startign I/O space address.	54	* @param ioaddr Startign I/O space address.
56	* @param size Size of the enabled I/O range.	55	* @param size Size of the enabled I/O range.
57	*	56	*
58	* @return 0 on success or an error code from errno.h.	57	* @return 0 on success or an error code from errno.h.
59	*/	58	*/
60	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)	59	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
61	{	60	{
62	count_t bits;	61	count_t bits;
63		62
64	bits = ioaddr + size;	63	bits = ioaddr + size;
65	if (bits > IO_PORTS)	64	if (bits > IO_PORTS)
66	return ENOENT;	65	return ENOENT;
67		66
68	if (task->arch.iomap.bits < bits) {	67	if (task->arch.iomap.bits < bits) {
69	bitmap_t oldiomap;	68	bitmap_t oldiomap;
70	__u8 *newmap;	69	__u8 *newmap;
71		70
72	/*	71	/*
73	* The I/O permission bitmap is too small and needs to be grown.	72	* The I/O permission bitmap is too small and needs to be grown.
74	*/	73	*/
75		74
76	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);	75	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
77	if (!newmap)	76	if (!newmap)
78	return ENOMEM;	77	return ENOMEM;
79		78
80	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);	79	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
81	bitmap_initialize(&task->arch.iomap, newmap, bits);	80	bitmap_initialize(&task->arch.iomap, newmap, bits);
82		81
83	/*	82	/*
84	* Mark the new range inaccessible.	83	* Mark the new range inaccessible.
85	*/	84	*/
86	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);	85	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
87		86
88	/*	87	/*
89	* In case there really existed smaller iomap,	88	* In case there really existed smaller iomap,
90	* copy its contents and deallocate it.	89	* copy its contents and deallocate it.
91	*/	90	*/
92	if (oldiomap.bits) {	91	if (oldiomap.bits) {
93	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);	92	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
94	free(oldiomap.map);	93	free(oldiomap.map);
95	}	94	}
96	}	95	}
97		96
98	/*	97	/*
99	* Enable the range and we are done.	98	* Enable the range and we are done.
100	*/	99	*/
101	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);	100	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
102		101
103	/*	102	/*
104	* Increment I/O Permission bitmap generation counter.	103	* Increment I/O Permission bitmap generation counter.
105	*/	104	*/
106	task->arch.iomapver++;	105	task->arch.iomapver++;
107		106
108	return 0;	107	return 0;
109	}	108	}
110		109
111	/** Install I/O Permission bitmap.	110	/** Install I/O Permission bitmap.
112	*	111	*
113	* Current task's I/O permission bitmap, if any, is installed	112	* Current task's I/O permission bitmap, if any, is installed
114	* in the current CPU's TSS.	113	* in the current CPU's TSS.
115	*	114	*
116	* Interrupts must be disabled prior this call.	115	* Interrupts must be disabled prior this call.
117	*/	116	*/
118	void io_perm_bitmap_install(void)	117	void io_perm_bitmap_install(void)
119	{	118	{
120	count_t bits;	119	count_t bits;
121	ptr_16_32_t cpugdtr;	120	ptr_16_32_t cpugdtr;
122	descriptor_t *gdt_p;	121	descriptor_t *gdt_p;
123	count_t ver;	122	count_t ver;
124		123
125	/* First, copy the I/O Permission Bitmap. */	124	/* First, copy the I/O Permission Bitmap. */
126	spinlock_lock(&TASK->lock);	125	spinlock_lock(&TASK->lock);
127	ver = TASK->arch.iomapver;	126	ver = TASK->arch.iomapver;
128	if ((bits = TASK->arch.iomap.bits)) {	127	if ((bits = TASK->arch.iomap.bits)) {
129	bitmap_t iomap;	128	bitmap_t iomap;
130		129
131	ASSERT(TASK->arch.iomap.map);	130	ASSERT(TASK->arch.iomap.map);
132	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);	131	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
133	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);	132	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
134	/*	133	/*
135	* It is safe to set the trailing eight bits because of the extra	134	* It is safe to set the trailing eight bits because of the extra
136	* convenience byte in TSS_IOMAP_SIZE.	135	* convenience byte in TSS_IOMAP_SIZE.
137	*/	136	*/
138	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);	137	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
139	}	138	}
140	spinlock_unlock(&TASK->lock);	139	spinlock_unlock(&TASK->lock);
141		140
142	/*	141	/*
143	* Second, adjust TSS segment limit.	142	* Second, adjust TSS segment limit.
144	* Take the extra ending byte with all bits set into account.	143	* Take the extra ending byte with all bits set into account.
145	*/	144	*/
146	gdtr_store(&cpugdtr);	145	gdtr_store(&cpugdtr);
147	gdt_p = (descriptor_t *) cpugdtr.base;	146	gdt_p = (descriptor_t *) cpugdtr.base;
148	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));	147	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
149	gdtr_load(&cpugdtr);	148	gdtr_load(&cpugdtr);
150		149
151	/*	150	/*
152	* Before we load new TSS limit, the current TSS descriptor	151	* Before we load new TSS limit, the current TSS descriptor
153	* type must be changed to describe inactive TSS.	152	* type must be changed to describe inactive TSS.
154	*/	153	*/
155	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;	154	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;
156	tr_load(selector(TSS_DES));	155	tr_load(selector(TSS_DES));
157		156
158	/*	157	/*
159	* Update the generation count so that faults caused by	158	* Update the generation count so that faults caused by
160	* early accesses can be serviced.	159	* early accesses can be serviced.
161	*/	160	*/
162	CPU->arch.iomapver_copy = ver;	161	CPU->arch.iomapver_copy = ver;
163	}	162	}
164		163
165	/** @}	164	/** @}
166	*/	165	*/
167		166
168		167

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/ddi/ddi.c – Rev 1702 → 1705