1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 /* 1 /*
3 * linux/compr_mm.h 2 * linux/compr_mm.h
4 * 3 *
5 * Memory management for pre-boot and ramdisk 4 * Memory management for pre-boot and ramdisk uncompressors
6 * 5 *
7 * Authors: Alain Knaff <alain@knaff.lu> 6 * Authors: Alain Knaff <alain@knaff.lu>
8 * 7 *
9 */ 8 */
10 9
11 #ifndef DECOMPR_MM_H 10 #ifndef DECOMPR_MM_H
12 #define DECOMPR_MM_H 11 #define DECOMPR_MM_H
13 12
14 #ifdef STATIC 13 #ifdef STATIC
15 14
16 /* Code active when included from pre-boot env 15 /* Code active when included from pre-boot environment: */
17 16
18 /* 17 /*
19 * Some architectures want to ensure there is 18 * Some architectures want to ensure there is no local data in their
20 * pre-boot environment, so that data can arbi 19 * pre-boot environment, so that data can arbitrarily relocated (via
21 * GOT references). This is achieved by defin 20 * GOT references). This is achieved by defining STATIC_RW_DATA to
22 * be null. 21 * be null.
23 */ 22 */
24 #ifndef STATIC_RW_DATA 23 #ifndef STATIC_RW_DATA
25 #define STATIC_RW_DATA static 24 #define STATIC_RW_DATA static
26 #endif 25 #endif
27 26
28 /* <<
29 * When an architecture needs to share the mal <<
30 * between compilation units, it needs to have <<
31 */ <<
32 #ifndef MALLOC_VISIBLE <<
33 #define MALLOC_VISIBLE static <<
34 #endif <<
35 <<
36 /* A trivial malloc implementation, adapted fr 27 /* A trivial malloc implementation, adapted from
37 * malloc by Hannu Savolainen 1993 and Matthi 28 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
38 */ 29 */
39 STATIC_RW_DATA unsigned long malloc_ptr; 30 STATIC_RW_DATA unsigned long malloc_ptr;
40 STATIC_RW_DATA int malloc_count; 31 STATIC_RW_DATA int malloc_count;
41 32
42 MALLOC_VISIBLE void *malloc(int size) !! 33 static void *malloc(int size)
43 { 34 {
44 void *p; 35 void *p;
45 36
46 if (size < 0) 37 if (size < 0)
47 return NULL; 38 return NULL;
48 if (!malloc_ptr) 39 if (!malloc_ptr)
49 malloc_ptr = free_mem_ptr; 40 malloc_ptr = free_mem_ptr;
50 41
51 malloc_ptr = (malloc_ptr + 7) & ~7; !! 42 malloc_ptr = (malloc_ptr + 3) & ~3; /* Align */
52 43
53 p = (void *)malloc_ptr; 44 p = (void *)malloc_ptr;
54 malloc_ptr += size; 45 malloc_ptr += size;
55 46
56 if (free_mem_end_ptr && malloc_ptr >= 47 if (free_mem_end_ptr && malloc_ptr >= free_mem_end_ptr)
57 return NULL; 48 return NULL;
58 49
59 malloc_count++; 50 malloc_count++;
60 return p; 51 return p;
61 } 52 }
62 53
63 MALLOC_VISIBLE void free(void *where) !! 54 static void free(void *where)
64 { 55 {
65 malloc_count--; 56 malloc_count--;
66 if (!malloc_count) 57 if (!malloc_count)
67 malloc_ptr = free_mem_ptr; 58 malloc_ptr = free_mem_ptr;
68 } 59 }
69 60
70 #define large_malloc(a) malloc(a) 61 #define large_malloc(a) malloc(a)
71 #define large_free(a) free(a) 62 #define large_free(a) free(a)
72 63
73 #define INIT 64 #define INIT
74 65
75 #else /* STATIC */ 66 #else /* STATIC */
76 67
77 /* Code active when compiled standalone for us 68 /* Code active when compiled standalone for use when loading ramdisk: */
78 69
79 #include <linux/kernel.h> 70 #include <linux/kernel.h>
80 #include <linux/fs.h> 71 #include <linux/fs.h>
81 #include <linux/string.h> 72 #include <linux/string.h>
82 #include <linux/slab.h> 73 #include <linux/slab.h>
83 #include <linux/vmalloc.h> 74 #include <linux/vmalloc.h>
84 75
85 /* Use defines rather than static inline in or 76 /* Use defines rather than static inline in order to avoid spurious
86 * warnings when not needed (indeed large_mall 77 * warnings when not needed (indeed large_malloc / large_free are not
87 * needed by inflate */ 78 * needed by inflate */
88 79
89 #define malloc(a) kmalloc(a, GFP_KERNEL) 80 #define malloc(a) kmalloc(a, GFP_KERNEL)
90 #define free(a) kfree(a) 81 #define free(a) kfree(a)
91 82
92 #define large_malloc(a) vmalloc(a) 83 #define large_malloc(a) vmalloc(a)
93 #define large_free(a) vfree(a) 84 #define large_free(a) vfree(a)
94 85
95 #define INIT __init 86 #define INIT __init
96 #define STATIC 87 #define STATIC
97 88
98 #include <linux/init.h> 89 #include <linux/init.h>
99 90
100 #endif /* STATIC */ 91 #endif /* STATIC */
101 92
102 #endif /* DECOMPR_MM_H */ 93 #endif /* DECOMPR_MM_H */
103 94
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