Subversion Repositories HelenOS

Rev

Rev 3425 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 3425 Rev 4692
Line 28... Line 28...
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
 
42
 
42
/**
-
 
43
 * Either 4*256M on 32-bit architecures or 16*256M on 64-bit architectures.
43
/** Last position allocated by as_get_mappable_page */
44
 */
-
 
45
#define MAX_HEAP_SIZE   (sizeof(uintptr_t)<<28)
44
static uintptr_t last_allocated = 0;
46
 
45
 
47
/** Create address space area.
46
/** Create address space area.
48
 *
47
 *
49
 * @param address Virtual address where to place new address space area.
48
 * @param address Virtual address where to place new address space area.
50
 * @param size Size of the area.
49
 * @param size    Size of the area.
51
 * @param flags Flags describing type of the area.
50
 * @param flags   Flags describing type of the area.
52
 *
51
 *
53
 * @return address on success, (void *) -1 otherwise.
52
 * @return address on success, (void *) -1 otherwise.
-
 
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
 *
-
 
68
 * @return zero on success or a code from @ref errno.h on failure.
67
 *
69
 *
68
 * @return Zero on success or a code from @ref errno.h on failure.
-
 
69
 */
70
 */
70
int as_area_resize(void *address, size_t size, int flags)
71
int as_area_resize(void *address, size_t size, int flags)
71
{
72
{
72
    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address,
73
    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
73
        (sysarg_t) size, (sysarg_t) flags);
74
        (sysarg_t) size, (sysarg_t) flags);
74
}
75
}
75
 
76
 
76
/** Destroy address space area.
77
/** Destroy address space area.
77
 *
78
 *
78
 * @param address Virtual address pointing into the address space area being
79
 * @param address Virtual address pointing into the address space area being
79
 *  destroyed.
80
 *                destroyed.
-
 
81
 *
-
 
82
 * @return zero on success or a code from @ref errno.h on failure.
80
 *
83
 *
81
 * @return Zero on success or a code from @ref errno.h on failure.
-
 
82
 */
84
 */
83
int as_area_destroy(void *address)
85
int as_area_destroy(void *address)
84
{
86
{
85
    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address);
87
    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
86
}
88
}
87
 
89
 
88
/** Change address-space area flags.
90
/** Change address-space area flags.
89
 *
91
 *
90
 * @param address Virtual address pointing into the address space area being
92
 * @param address Virtual address pointing into the address space area being
91
 *  modified.
93
 *                modified.
92
 * @param flags New flags describing type of the area.
94
 * @param flags   New flags describing type of the area.
-
 
95
 *
-
 
96
 * @return zero on success or a code from @ref errno.h on failure.
93
 *
97
 *
94
 * @return Zero on success or a code from @ref errno.h on failure.
-
 
95
 */
98
 */
96
int as_area_change_flags(void *address, int flags)
99
int as_area_change_flags(void *address, int flags)
97
{
100
{
98
    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
101
    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
99
        (sysarg_t) flags);
102
        (sysarg_t) flags);
100
}
103
}
101
 
104
 
102
static size_t heapsize = 0;
-
 
103
static size_t maxheapsize = (size_t) (-1);
-
 
104
 
-
 
105
static void * last_allocated = 0;
-
 
106
 
-
 
107
/* Start of heap linker symbol */
-
 
108
extern char _heap;
-
 
109
 
-
 
110
/** Sbrk emulation
-
 
111
 *
-
 
112
 * @param incr New area that should be allocated or negative,
-
 
113
               if it should be shrinked
-
 
114
 * @return Pointer to newly allocated area
-
 
115
 */
-
 
116
void *sbrk(ssize_t incr)
-
 
117
{
-
 
118
    int rc;
-
 
119
    void *res;
-
 
120
   
-
 
121
    /* Check for invalid values */
-
 
122
    if (incr < 0 && -incr > heapsize)
-
 
123
        return NULL;
-
 
124
   
-
 
125
    /* Check for too large value */
-
 
126
    if (incr > 0 && incr+heapsize < heapsize)
-
 
127
        return NULL;
-
 
128
   
-
 
129
    /* Check for too small values */
-
 
130
    if (incr < 0 && incr+heapsize > heapsize)
-
 
131
        return NULL;
-
 
132
   
-
 
133
    /* Check for user limit */
-
 
134
    if ((maxheapsize != (size_t) (-1)) && (heapsize + incr) > maxheapsize)
-
 
135
        return NULL;
-
 
136
   
-
 
137
    rc = as_area_resize(&_heap, heapsize + incr, 0);
-
 
138
    if (rc != 0)
-
 
139
        return NULL;
-
 
140
   
-
 
141
    /* Compute start of new area */
-
 
142
    res = (void *) &_heap + heapsize;
-
 
143
 
-
 
144
    heapsize += incr;
-
 
145
 
-
 
146
    return res;
-
 
147
}
-
 
148
 
-
 
149
/** Set maximum heap size and return pointer just after the heap */
-
 
150
void *set_maxheapsize(size_t mhs)
-
 
151
{
-
 
152
    maxheapsize = mhs;
-
 
153
    /* Return pointer to area not managed by sbrk */
-
 
154
    return ((void *) &_heap + maxheapsize);
-
 
155
}
-
 
156
 
-
 
157
/** Return pointer to some unmapped area, where fits new as_area
105
/** Return pointer to some unmapped area, where fits new as_area
158
 *
106
 *
159
 * @param sz Requested size of the allocation.
107
 * @param size Requested size of the allocation.
160
 *
108
 *
161
 * @return Pointer to the beginning
109
 * @return pointer to the beginning
162
 *
110
 *
163
 * TODO: make some first_fit/... algorithm, we are now just incrementing
-
 
164
 *       the pointer to last area
-
 
165
 */
111
 */
166
void *as_get_mappable_page(size_t sz)
112
void *as_get_mappable_page(size_t size)
167
{
113
{
168
    void *res;
114
    if (size == 0)
169
    uint64_t asz;
115
        return NULL;
170
    int i;
-
 
171
   
116
   
172
    if (!sz)
-
 
173
        return NULL;   
-
 
174
 
-
 
175
    asz = 1 << (fnzb64(sz - 1) + 1);
117
    size_t sz = 1 << (fnzb(size - 1) + 1);
176
 
-
 
177
    /* Set heapsize to some meaningful value */
-
 
178
    if (maxheapsize == -1)
118
    if (last_allocated == 0)
179
        set_maxheapsize(MAX_HEAP_SIZE);
119
        last_allocated = get_max_heap_addr();
180
   
120
   
181
    /*
121
    /*
182
     * Make sure we allocate from naturally aligned address.
122
     * Make sure we allocate from naturally aligned address.
183
     */
123
     */
184
    i = 0;
-
 
185
    if (!last_allocated) {
-
 
186
        last_allocated = (void *) ALIGN_UP((void *) &_heap +
-
 
187
            maxheapsize, asz);
-
 
188
    } else {
-
 
189
        last_allocated = (void *) ALIGN_UP(((uintptr_t)
-
 
190
            last_allocated) + (int) (i > 0), asz);
-
 
191
    }
-
 
192
 
-
 
193
    res = last_allocated;
124
    uintptr_t res = ALIGN_UP(last_allocated, sz);
194
    last_allocated += ALIGN_UP(sz, PAGE_SIZE);
125
    last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
195
 
126
   
196
    return res;
127
    return ((void *) res);
197
}
128
}
198
 
129
 
199
/** @}
130
/** @}
200
 */
131
 */