WebSVN – HelenOS-historic – Diff – /uspace/trunk/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.
 */
 
#include <as.h>
#include <libc.h>
#include <unistd.h>
#include <task.h>
 
/** 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);
}
 
static size_t heapsize = 0;
static size_t maxheapsize = (size_t)(-1);
/* Start of heap linker symbol */
extern char _heap;
 
/** Sbrk emulation
 *
 * @param size New area that should be allocated or negative,
               if it should be shrinked
 * @return Pointer to newly allocated area
 */
void *sbrk(ssize_t incr)
{
    int rc;
    void *res;
    /* Check for invalid values */
    if (incr < 0 && -incr > heapsize)
        return NULL;
    /* Check for too large value */
    if (incr > 0 && incr+heapsize < heapsize)
        return NULL;
    /* Check for too small values */
    if (incr < 0 && incr+heapsize > heapsize)
        return NULL;
    /* Check for user limit */
    if ((maxheapsize!=(size_t)(-1)) && (heapsize + incr)>maxheapsize) return NULL;
 
    rc = as_area_resize(&_heap, heapsize + incr,0);
    if (rc != 0)
        return NULL;
   
    /* Compute start of new area */
    res = (void *)&_heap + heapsize;
 
    heapsize += incr;
 
    return res;
}
 
void *set_maxheapsize(size_t mhs)
{
    maxheapsize=mhs;
    /* Return pointer to area not managed by sbrk */
    return (void *)&_heap + maxheapsize;
 
}
 

Subversion Repositories HelenOS-historic

(root)/uspace/trunk/libc/generic/as.c @ 1400 – Rev 1357 → 1363

Rev 1357		Rev 1363
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 <as.h>	29	#include <as.h>
30	#include <libc.h>	30	#include <libc.h>
31	#include <unistd.h>	31	#include <unistd.h>
32	#include <task.h>	32	#include <task.h>
33		33
34	/** Create address space area.	34	/** Create address space area.
35	*	35	*
36	* @param address Virtual address where to place new address space area.	36	* @param address Virtual address where to place new address space area.
37	* @param size Size of the area.	37	* @param size Size of the area.
38	* @param flags Flags describing type of the area.	38	* @param flags Flags describing type of the area.
39	*	39	*
40	* @return address on success, (void *) -1 otherwise.	40	* @return address on success, (void *) -1 otherwise.
41	*/	41	*/
42	void as_area_create(void address, size_t size, int flags)	42	void as_area_create(void address, size_t size, int flags)
43	{	43	{
44	return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags);	44	return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags);
45	}	45	}
46		46
47	/** Resize address space area.	47	/** Resize address space area.
48	*	48	*
49	* @param address Virtual address pointing into already existing address space area.	49	* @param address Virtual address pointing into already existing address space area.
50	* @param size New requested size of the area.	50	* @param size New requested size of the area.
51	* @param flags Currently unused.	51	* @param flags Currently unused.
52	*	52	*
53	* @return Zero on success or a code from @ref errno.h on failure.	53	* @return Zero on success or a code from @ref errno.h on failure.
54	*/	54	*/
55	int as_area_resize(void *address, size_t size, int flags)	55	int as_area_resize(void *address, size_t size, int flags)
56	{	56	{
57	return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags);	57	return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags);
58	}	58	}
59		59
60	/** Destroy address space area.	60	/** Destroy address space area.
61	*	61	*
62	* @param address Virtual address pointing into the address space area being destroyed.	62	* @param address Virtual address pointing into the address space area being destroyed.
63	*	63	*
64	* @return Zero on success or a code from @ref errno.h on failure.	64	* @return Zero on success or a code from @ref errno.h on failure.
65	*/	65	*/
66	int as_area_destroy(void *address)	66	int as_area_destroy(void *address)
67	{	67	{
68	return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address);	68	return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address);
69	}	69	}
70		70
71	static size_t heapsize = 0;	71	static size_t heapsize = 0;
-		72	static size_t maxheapsize = (size_t)(-1);
72	/* Start of heap linker symbol */	73	/* Start of heap linker symbol */
73	extern char _heap;	74	extern char _heap;
74		75
75	/** Sbrk emulation	76	/** Sbrk emulation
76	*	77	*
77	* @param size New area that should be allocated or negative,	78	* @param size New area that should be allocated or negative,
78	if it should be shrinked	79	if it should be shrinked
79	* @return Pointer to newly allocated area	80	* @return Pointer to newly allocated area
80	*/	81	*/
81	void *sbrk(ssize_t incr)	82	void *sbrk(ssize_t incr)
82	{	83	{
83	int rc;	84	int rc;
84	void *res;	85	void *res;
85	/* Check for invalid values */	86	/* Check for invalid values */
86	if (incr < 0 && -incr > heapsize)	87	if (incr < 0 && -incr > heapsize)
87	return NULL;	88	return NULL;
88	/* Check for too large value */	89	/* Check for too large value */
89	if (incr > 0 && incr+heapsize < heapsize)	90	if (incr > 0 && incr+heapsize < heapsize)
90	return NULL;	91	return NULL;
91	/* Check for too small values */	92	/* Check for too small values */
92	if (incr < 0 && incr+heapsize > heapsize)	93	if (incr < 0 && incr+heapsize > heapsize)
93	return NULL;	94	return NULL;
-		95	/* Check for user limit */
-		96	if ((maxheapsize!=(size_t)(-1)) && (heapsize + incr)>maxheapsize) return NULL;
94		97
95	rc = as_area_resize(&_heap, heapsize + incr,0);	98	rc = as_area_resize(&_heap, heapsize + incr,0);
96	if (rc != 0)	99	if (rc != 0)
97	return NULL;	100	return NULL;
98		101
99	/* Compute start of new area */	102	/* Compute start of new area */
100	res = (void *)&_heap + heapsize;	103	res = (void *)&_heap + heapsize;
101		104
102	heapsize += incr;	105	heapsize += incr;
103		106
104	return res;	107	return res;
105	}	108	}
-		109
-		110	void *set_maxheapsize(size_t mhs)
-		111	{
-		112	maxheapsize=mhs;
-		113	/* Return pointer to area not managed by sbrk */
-		114	return (void *)&_heap + maxheapsize;
-		115
-		116	}
106		117