WebSVN – HelenOS – Diff – /tags/0.4.1/uspace/lib/libc/generic/as.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 libc
 * @{
 */
/** @file
 */
 
#include <as.h>
#include <libc.h>
#include <unistd.h>
#include <align.h>
#include <sys/types.h>
#include <bitops.h>
#include <malloc.h>
 
/** Last position allocated by as_get_mappable_page */
static uintptr_t last_allocated = 0;
 
/** Create address space area.
 *
 * @param address Virtual address where to place new address space area.
 * @param size    Size of the area.
 * @param flags   Flags describing type of the area.
 *
 * @return address on success, (void *) -1 otherwise.
 *
 */
void *as_area_create(void *address, size_t size, int flags)
{
    return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
        (sysarg_t) size, (sysarg_t) flags);
}
 
/** Resize address space area.
 *
 * @param address Virtual address pointing into already existing address space
 *                area.
 * @param size    New requested size of the area.
 * @param flags   Currently unused.
 *
 * @return zero on success or a code from @ref errno.h on failure.
 *
 */
int as_area_resize(void *address, size_t size, int flags)
{
    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
        (sysarg_t) size, (sysarg_t) flags);
}
 
/** Destroy address space area.
 *
 * @param address Virtual address pointing into the address space area being
 *                destroyed.
 *
 * @return zero on success or a code from @ref errno.h on failure.
 *
 */
int as_area_destroy(void *address)
{
    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
}
 
/** Change address-space area flags.
 *
 * @param address Virtual address pointing into the address space area being
 *                modified.
 * @param flags   New flags describing type of the area.
 *
 * @return zero on success or a code from @ref errno.h on failure.
 *
 */
int as_area_change_flags(void *address, int flags)
{
    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
        (sysarg_t) flags);
}
 
/** Return pointer to some unmapped area, where fits new as_area
 *
 * @param size Requested size of the allocation.
 *
 * @return pointer to the beginning
 *
 */
void *as_get_mappable_page(size_t size)
{
    if (size == 0)
        return NULL;
   
    size_t sz = 1 << (fnzb(size - 1) + 1);
    if (last_allocated == 0)
        last_allocated = get_max_heap_addr();
   
    /*
     * Make sure we allocate from naturally aligned address.
     */
    uintptr_t res = ALIGN_UP(last_allocated, sz);
    last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
   
    return ((void *) res);
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/tags/0.4.1/uspace/lib/libc/generic/as.c – Rev 4601 → 4687

Rev 4601		Rev 4687
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 libc	29	/** @addtogroup libc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <as.h>	35	#include <as.h>
36	#include <libc.h>	36	#include <libc.h>
37	#include <unistd.h>	37	#include <unistd.h>
38	#include <align.h>	38	#include <align.h>
39	#include <sys/types.h>	39	#include <sys/types.h>
40	#include <bitops.h>	40	#include <bitops.h>
41	#include <malloc.h>	41	#include <malloc.h>
42		42
43	/** Last position allocated by as_get_mappable_page */	43	/** Last position allocated by as_get_mappable_page */
44	static uintptr_t last_allocated = 0;	44	static uintptr_t last_allocated = 0;
45		45
46	/** Create address space area.	46	/** Create address space area.
47	*	47	*
48	* @param address Virtual address where to place new address space area.	48	* @param address Virtual address where to place new address space area.
49	* @param size Size of the area.	49	* @param size Size of the area.
50	* @param flags Flags describing type of the area.	50	* @param flags Flags describing type of the area.
51	*	51	*
52	* @return address on success, (void *) -1 otherwise.	52	* @return address on success, (void *) -1 otherwise.
53	*	53	*
54	*/	54	*/
55	void as_area_create(void address, size_t size, int flags)	55	void as_area_create(void address, size_t size, int flags)
56	{	56	{
57	return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,	57	return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
58	(sysarg_t) size, (sysarg_t) flags);	58	(sysarg_t) size, (sysarg_t) flags);
59	}	59	}
60		60
61	/** Resize address space area.	61	/** Resize address space area.
62	*	62	*
63	* @param address Virtual address pointing into already existing address space	63	* @param address Virtual address pointing into already existing address space
64	* area.	64	* area.
65	* @param size New requested size of the area.	65	* @param size New requested size of the area.
66	* @param flags Currently unused.	66	* @param flags Currently unused.
67	*	67	*
68	* @return zero on success or a code from @ref errno.h on failure.	68	* @return zero on success or a code from @ref errno.h on failure.
69	*	69	*
70	*/	70	*/
71	int as_area_resize(void *address, size_t size, int flags)	71	int as_area_resize(void *address, size_t size, int flags)
72	{	72	{
73	return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,	73	return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
74	(sysarg_t) size, (sysarg_t) flags);	74	(sysarg_t) size, (sysarg_t) flags);
75	}	75	}
76		76
77	/** Destroy address space area.	77	/** Destroy address space area.
78	*	78	*
79	* @param address Virtual address pointing into the address space area being	79	* @param address Virtual address pointing into the address space area being
80	* destroyed.	80	* destroyed.
81	*	81	*
82	* @return zero on success or a code from @ref errno.h on failure.	82	* @return zero on success or a code from @ref errno.h on failure.
83	*	83	*
84	*/	84	*/
85	int as_area_destroy(void *address)	85	int as_area_destroy(void *address)
86	{	86	{
87	return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);	87	return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
88	}	88	}
89		89
90	/** Change address-space area flags.	90	/** Change address-space area flags.
91	*	91	*
92	* @param address Virtual address pointing into the address space area being	92	* @param address Virtual address pointing into the address space area being
93	* modified.	93	* modified.
94	* @param flags New flags describing type of the area.	94	* @param flags New flags describing type of the area.
95	*	95	*
96	* @return zero on success or a code from @ref errno.h on failure.	96	* @return zero on success or a code from @ref errno.h on failure.
97	*	97	*
98	*/	98	*/
99	int as_area_change_flags(void *address, int flags)	99	int as_area_change_flags(void *address, int flags)
100	{	100	{
101	return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,	101	return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
102	(sysarg_t) flags);	102	(sysarg_t) flags);
103	}	103	}
104		104
105	/** Return pointer to some unmapped area, where fits new as_area	105	/** Return pointer to some unmapped area, where fits new as_area
106	*	106	*
107	* @param size Requested size of the allocation.	107	* @param size Requested size of the allocation.
108	*	108	*
109	* @return pointer to the beginning	109	* @return pointer to the beginning
110	*	110	*
111	*/	111	*/
112	void *as_get_mappable_page(size_t size)	112	void *as_get_mappable_page(size_t size)
113	{	113	{
114	if (size == 0)	114	if (size == 0)
115	return NULL;	115	return NULL;
116		116
117	size_t sz = 1 << (fnzb(size - 1) + 1);	117	size_t sz = 1 << (fnzb(size - 1) + 1);
118	if (last_allocated == 0)	118	if (last_allocated == 0)
119	last_allocated = get_max_heap_addr();	119	last_allocated = get_max_heap_addr();
120		120
121	/*	121	/*
122	* Make sure we allocate from naturally aligned address.	122	* Make sure we allocate from naturally aligned address.
123	*/	123	*/
124	uintptr_t res = ALIGN_UP(last_allocated, sz);	124	uintptr_t res = ALIGN_UP(last_allocated, sz);
125	last_allocated = res + ALIGN_UP(size, PAGE_SIZE);	125	last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
126		126
127	return ((void *) res);	127	return ((void *) res);
128	}	128	}
129		129
130	/** @}	130	/** @}
131	*/	131	*/
132		132