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