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