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.
 */
 
#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 1263	Rev 1278
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	#include <ddi/ddi.h>	29	#include <ddi/ddi.h>
30	#include <arch/ddi/ddi.h>	30	#include <arch/ddi/ddi.h>
31	#include <proc/task.h>	31	#include <proc/task.h>
32	#include <arch/types.h>	32	#include <arch/types.h>
33	#include <typedefs.h>	33	#include <typedefs.h>
34	#include <adt/bitmap.h>	34	#include <adt/bitmap.h>
35	#include <mm/slab.h>	35	#include <mm/slab.h>
36	#include <arch/pm.h>	36	#include <arch/pm.h>
37	#include <errno.h>	37	#include <errno.h>
38	#include <arch/cpu.h>	38	#include <arch/cpu.h>
39	#include <cpu.h>	39	#include <cpu.h>
40	#include <arch.h>	40	#include <arch.h>
41	#include <align.h>	41	#include <align.h>
42		42
43	/** Enable I/O space range for task.	43	/** Enable I/O space range for task.
44	*	44	*
45	* Interrupts are disabled and task is locked.	45	* Interrupts are disabled and task is locked.
46	*	46	*
47	* @param task Task.	47	* @param task Task.
48	* @param ioaddr Startign I/O space address.	48	* @param ioaddr Startign I/O space address.
49	* @param size Size of the enabled I/O range.	49	* @param size Size of the enabled I/O range.
50	*	50	*
51	* @return 0 on success or an error code from errno.h.	51	* @return 0 on success or an error code from errno.h.
52	*/	52	*/
53	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)	53	int ddi_iospace_enable_arch(task_t *task, __address ioaddr, size_t size)
54	{	54	{
55	count_t bits;	55	count_t bits;
56		56
57	bits = ioaddr + size;	57	bits = ioaddr + size;
58	if (bits > IO_PORTS)	58	if (bits > IO_PORTS)
59	return ENOENT;	59	return ENOENT;
60		60
61	if (task->arch.iomap.bits < bits) {	61	if (task->arch.iomap.bits < bits) {
62	bitmap_t oldiomap;	62	bitmap_t oldiomap;
63	__u8 *newmap;	63	__u8 *newmap;
64		64
65	/*	65	/*
66	* The I/O permission bitmap is too small and needs to be grown.	66	* The I/O permission bitmap is too small and needs to be grown.
67	*/	67	*/
68		68
69	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);	69	newmap = (__u8 *) malloc(BITS2BYTES(bits), FRAME_ATOMIC);
70	if (!newmap)	70	if (!newmap)
71	return ENOMEM;	71	return ENOMEM;
72		72
73	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);	73	bitmap_initialize(&oldiomap, task->arch.iomap.map, task->arch.iomap.bits);
74	bitmap_initialize(&task->arch.iomap, newmap, bits);	74	bitmap_initialize(&task->arch.iomap, newmap, bits);
75		75
76	/*	76	/*
77	* Mark the new range inaccessible.	77	* Mark the new range inaccessible.
78	*/	78	*/
79	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);	79	bitmap_set_range(&task->arch.iomap, oldiomap.bits, bits - oldiomap.bits);
80		80
81	/*	81	/*
82	* In case there really existed smaller iomap,	82	* In case there really existed smaller iomap,
83	* copy its contents and deallocate it.	83	* copy its contents and deallocate it.
84	*/	84	*/
85	if (oldiomap.bits) {	85	if (oldiomap.bits) {
86	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);	86	bitmap_copy(&task->arch.iomap, &oldiomap, oldiomap.bits);
87	free(oldiomap.map);	87	free(oldiomap.map);
88	}	88	}
89	}	89	}
90		90
91	/*	91	/*
92	* Enable the range and we are done.	92	* Enable the range and we are done.
93	*/	93	*/
94	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);	94	bitmap_clear_range(&task->arch.iomap, (index_t) ioaddr, (count_t) size);
95		95
96	/*	96	/*
97	* Increment I/O Permission bitmap generation counter.	97	* Increment I/O Permission bitmap generation counter.
98	*/	98	*/
99	task->arch.iomapver++;	99	task->arch.iomapver++;
100		100
101	return 0;	101	return 0;
102	}	102	}
103		103
104	/** Enable/disable interrupts for syscall	-
105	*	-
106	* @param enable If non-zero, interrupts are enabled, otherwise disabled	-
107	* @param flags EFLAGS flags register	-
108	*/	-
109	__native ddi_int_control_arch(__native enable, __native *flags)	-
110	{	-
111	if (enable)	-
112	*flags \|= EFLAGS_IF;	-
113	else	-
114	*flags &= ~EFLAGS_IF;	-
115	return 0;	-
116	}	-
117		-
118	/** Install I/O Permission bitmap.	104	/** Install I/O Permission bitmap.
119	*	105	*
120	* Current task's I/O permission bitmap, if any, is installed	106	* Current task's I/O permission bitmap, if any, is installed
121	* in the current CPU's TSS.	107	* in the current CPU's TSS.
122	*	108	*
123	* Interrupts must be disabled prior this call.	109	* Interrupts must be disabled prior this call.
124	*/	110	*/
125	void io_perm_bitmap_install(void)	111	void io_perm_bitmap_install(void)
126	{	112	{
127	count_t bits;	113	count_t bits;
128	ptr_16_32_t cpugdtr;	114	ptr_16_32_t cpugdtr;
129	descriptor_t *gdt_p;	115	descriptor_t *gdt_p;
130	count_t ver;	116	count_t ver;
131		117
132	/* First, copy the I/O Permission Bitmap. */	118	/* First, copy the I/O Permission Bitmap. */
133	spinlock_lock(&TASK->lock);	119	spinlock_lock(&TASK->lock);
134	ver = TASK->arch.iomapver;	120	ver = TASK->arch.iomapver;
135	if ((bits = TASK->arch.iomap.bits)) {	121	if ((bits = TASK->arch.iomap.bits)) {
136	bitmap_t iomap;	122	bitmap_t iomap;
137		123
138	ASSERT(TASK->arch.iomap.map);	124	ASSERT(TASK->arch.iomap.map);
139	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);	125	bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8);
140	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);	126	bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits);
141	/*	127	/*
142	* It is safe to set the trailing eight bits because of the extra	128	* It is safe to set the trailing eight bits because of the extra
143	* convenience byte in TSS_IOMAP_SIZE.	129	* convenience byte in TSS_IOMAP_SIZE.
144	*/	130	*/
145	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);	131	bitmap_set_range(&iomap, ALIGN_UP(TASK->arch.iomap.bits, 8), 8);
146	}	132	}
147	spinlock_unlock(&TASK->lock);	133	spinlock_unlock(&TASK->lock);
148		134
149	/*	135	/*
150	* Second, adjust TSS segment limit.	136	* Second, adjust TSS segment limit.
151	* Take the extra ending byte with all bits set into account.	137	* Take the extra ending byte with all bits set into account.
152	*/	138	*/
153	gdtr_store(&cpugdtr);	139	gdtr_store(&cpugdtr);
154	gdt_p = (descriptor_t *) cpugdtr.base;	140	gdt_p = (descriptor_t *) cpugdtr.base;
155	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));	141	gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits));
156	gdtr_load(&cpugdtr);	142	gdtr_load(&cpugdtr);
157		143
158	/*	144	/*
159	* Before we load new TSS limit, the current TSS descriptor	145	* Before we load new TSS limit, the current TSS descriptor
160	* type must be changed to describe inactive TSS.	146	* type must be changed to describe inactive TSS.
161	*/	147	*/
162	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;	148	gdt_p[TSS_DES].access = AR_PRESENT \| AR_TSS \| DPL_KERNEL;
163	tr_load(selector(TSS_DES));	149	tr_load(selector(TSS_DES));
164		150
165	/*	151	/*
166	* Update the generation count so that faults caused by	152	* Update the generation count so that faults caused by
167	* early accesses can be serviced.	153	* early accesses can be serviced.
168	*/	154	*/
169	CPU->arch.iomapver_copy = ver;	155	CPU->arch.iomapver_copy = ver;
170	}	156	}
171		157

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/ddi/ddi.c – Rev 1263 → 1278