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 ia32
 * @ingroup ddi
 * @{
 */
/** @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 1278	Rev 1702
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
-		30	* @ingroup ddi
-		31	* @{
-		32	*/
-		33	/** @file
-		34	*/
-		35
29	#include <ddi/ddi.h>	36	#include <ddi/ddi.h>
30	#include <arch/ddi/ddi.h>	37	#include <arch/ddi/ddi.h>
31	#include <proc/task.h>	38	#include <proc/task.h>
32	#include <arch/types.h>	39	#include <arch/types.h>
33	#include <typedefs.h>	40	#include <typedefs.h>
34	#include <adt/bitmap.h>	41	#include <adt/bitmap.h>
35	#include <mm/slab.h>	42	#include <mm/slab.h>
36	#include <arch/pm.h>	43	#include <arch/pm.h>
37	#include <errno.h>	44	#include <errno.h>
38	#include <arch/cpu.h>	45	#include <arch/cpu.h>
39	#include <cpu.h>	46	#include <cpu.h>
40	#include <arch.h>	47	#include <arch.h>
41	#include <align.h>	48	#include <align.h>
42		49
43	/** Enable I/O space range for task.	50	/** Enable I/O space range for task.
44	*	51	*
45	* Interrupts are disabled and task is locked.	52	* Interrupts are disabled and task is locked.
46	*	53	*
47	* @param task Task.	54	* @param task Task.
48	* @param ioaddr Startign I/O space address.	55	* @param ioaddr Startign I/O space address.
49	* @param size Size of the enabled I/O range.	56	* @param size Size of the enabled I/O range.
50	*	57	*
51	* @return 0 on success or an error code from errno.h.	58	* @return 0 on success or an error code from errno.h.
52	*/	59	*/
53	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)	60	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
54	{	61	{
55	count_t bits;	62	count_t bits;
56		63
57	bits = ioaddr + size;	64	bits = ioaddr + size;
58	if (bits > IO_PORTS)	65	if (bits > IO_PORTS)
59	return ENOENT;	66	return ENOENT;
60		67
61	if (task->arch.iomap.bits < bits) {	68	if (task->arch.iomap.bits < bits) {
62	bitmap_t oldiomap;	69	bitmap_t oldiomap;
63	__u8 *newmap;	70	__u8 *newmap;
64		71
65	/*	72	/*
66	* The I/O permission bitmap is too small and needs to be grown.	73	* The I/O permission bitmap is too small and needs to be grown.
67	*/	74	*/
68		75
69	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);	76	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
70	if (!newmap)	77	if (!newmap)
71	return ENOMEM;	78	return ENOMEM;
72		79
73	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);	80	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
74	bitmap_initialize(&task->arch.iomap, newmap, bits);	81	bitmap_initialize(&task->arch.iomap, newmap, bits);
75		82
76	/*	83	/*
77	* Mark the new range inaccessible.	84	* Mark the new range inaccessible.
78	*/	85	*/
79	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);	86	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
80		87
81	/*	88	/*
82	* In case there really existed smaller iomap,	89	* In case there really existed smaller iomap,
83	* copy its contents and deallocate it.	90	* copy its contents and deallocate it.
84	*/	91	*/
85	if (oldiomap.bits) {	92	if (oldiomap.bits) {
86	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);	93	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
87	free(oldiomap.map);	94	free(oldiomap.map);
88	}	95	}
89	}	96	}
90		97
91	/*	98	/*
92	* Enable the range and we are done.	99	* Enable the range and we are done.
93	*/	100	*/
94	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);	101	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
95		102
96	/*	103	/*
97	* Increment I/O Permission bitmap generation counter.	104	* Increment I/O Permission bitmap generation counter.
98	*/	105	*/
99	task->arch.iomapver++;	106	task->arch.iomapver++;
100		107
101	return 0;	108	return 0;
102	}	109	}
103		110
104	/** Install I/O Permission bitmap.	111	/** Install I/O Permission bitmap.
105	*	112	*
106	* Current task's I/O permission bitmap, if any, is installed	113	* Current task's I/O permission bitmap, if any, is installed
107	* in the current CPU's TSS.	114	* in the current CPU's TSS.
108	*	115	*
109	* Interrupts must be disabled prior this call.	116	* Interrupts must be disabled prior this call.
110	*/	117	*/
111	void io_perm_bitmap_install(void)	118	void io_perm_bitmap_install(void)
112	{	119	{
113	count_t bits;	120	count_t bits;
114	ptr_16_32_t cpugdtr;	121	ptr_16_32_t cpugdtr;
115	descriptor_t *gdt_p;	122	descriptor_t *gdt_p;
116	count_t ver;	123	count_t ver;
117		124
118	/* First, copy the I/O Permission Bitmap. */	125	/* First, copy the I/O Permission Bitmap. */
119	spinlock_lock(&TASK->lock);	126	spinlock_lock(&TASK->lock);
120	ver = TASK->arch.iomapver;	127	ver = TASK->arch.iomapver;
121	if ((bits = TASK->arch.iomap.bits)) {	128	if ((bits = TASK->arch.iomap.bits)) {
122	bitmap_t iomap;	129	bitmap_t iomap;
123		130
124	ASSERT(TASK->arch.iomap.map);	131	ASSERT(TASK->arch.iomap.map);
125	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);	132	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
126	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);	133	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
127	/*	134	/*
128	* It is safe to set the trailing eight bits because of the extra	135	* It is safe to set the trailing eight bits because of the extra
129	* convenience byte in TSS_IOMAP_SIZE.	136	* convenience byte in TSS_IOMAP_SIZE.
130	*/	137	*/
131	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);	138	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
132	}	139	}
133	spinlock_unlock(&TASK->lock);	140	spinlock_unlock(&TASK->lock);
134		141
135	/*	142	/*
136	* Second, adjust TSS segment limit.	143	* Second, adjust TSS segment limit.
137	* Take the extra ending byte with all bits set into account.	144	* Take the extra ending byte with all bits set into account.
138	*/	145	*/
139	gdtr_store(&cpugdtr);	146	gdtr_store(&cpugdtr);
140	gdt_p = (descriptor_t *) cpugdtr.base;	147	gdt_p = (descriptor_t *) cpugdtr.base;
141	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));	148	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
142	gdtr_load(&cpugdtr);	149	gdtr_load(&cpugdtr);
143		150
144	/*	151	/*
145	* Before we load new TSS limit, the current TSS descriptor	152	* Before we load new TSS limit, the current TSS descriptor
146	* type must be changed to describe inactive TSS.	153	* type must be changed to describe inactive TSS.
147	*/	154	*/
148	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;	155	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;
149	tr_load(selector(TSS_DES));	156	tr_load(selector(TSS_DES));
150		157
151	/*	158	/*
152	* Update the generation count so that faults caused by	159	* Update the generation count so that faults caused by
153	* early accesses can be serviced.	160	* early accesses can be serviced.
154	*/	161	*/
155	CPU->arch.iomapver_copy = ver;	162	CPU->arch.iomapver_copy = ver;
156	}	163	}
-		164
-		165	/** @}
-		166	*/
-		167
157		168

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/ddi/ddi.c – Rev 1278 → 1702