projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| bc22c17e AK |
2 | /* |
| 3 | * linux/compr_mm.h | |
| 4 | * | |
| 5 | * Memory management for pre-boot and ramdisk uncompressors | |
| 6 | * | |
| 7 | * Authors: Alain Knaff <alain@knaff.lu> | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| 11 | #ifndef DECOMPR_MM_H | |
| 12 | #define DECOMPR_MM_H | |
| 13 | ||
| 14 | #ifdef STATIC | |
| 15 | ||
| 16 | /* Code active when included from pre-boot environment: */ | |
| 17 | ||
| 5ceaa2f3 RK |
18 | /* |
| 19 | * Some architectures want to ensure there is no local data in their | |
| 25985edc | 20 | * pre-boot environment, so that data can arbitrarily relocated (via |
| 5ceaa2f3 RK |
21 | * GOT references). This is achieved by defining STATIC_RW_DATA to |
| 22 | * be null. | |
| 23 | */ | |
| 24 | #ifndef STATIC_RW_DATA | |
| 25 | #define STATIC_RW_DATA static | |
| 26 | #endif | |
| 27 | ||
| bc22c17e AK |
28 | /* A trivial malloc implementation, adapted from |
| 29 | * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994 | |
| 30 | */ | |
| 5ceaa2f3 RK |
31 | STATIC_RW_DATA unsigned long malloc_ptr; |
| 32 | STATIC_RW_DATA int malloc_count; | |
| bc22c17e AK |
33 | |
| 34 | static void *malloc(int size) | |
| 35 | { | |
| 36 | void *p; | |
| 37 | ||
| 38 | if (size < 0) | |
| c1e7c3ae | 39 | return NULL; |
| bc22c17e AK |
40 | if (!malloc_ptr) |
| 41 | malloc_ptr = free_mem_ptr; | |
| 42 | ||
| 43 | malloc_ptr = (malloc_ptr + 3) & ~3; /* Align */ | |
| 44 | ||
| 45 | p = (void *)malloc_ptr; | |
| 46 | malloc_ptr += size; | |
| 47 | ||
| 48 | if (free_mem_end_ptr && malloc_ptr >= free_mem_end_ptr) | |
| c1e7c3ae | 49 | return NULL; |
| bc22c17e AK |
50 | |
| 51 | malloc_count++; | |
| 52 | return p; | |
| 53 | } | |
| 54 | ||
| 55 | static void free(void *where) | |
| 56 | { | |
| 57 | malloc_count--; | |
| 58 | if (!malloc_count) | |
| 59 | malloc_ptr = free_mem_ptr; | |
| 60 | } | |
| 61 | ||
| 62 | #define large_malloc(a) malloc(a) | |
| 63 | #define large_free(a) free(a) | |
| 64 | ||
| bc22c17e AK |
65 | #define INIT |
| 66 | ||
| 67 | #else /* STATIC */ | |
| 68 | ||
| 69 | /* Code active when compiled standalone for use when loading ramdisk: */ | |
| 70 | ||
| 71 | #include <linux/kernel.h> | |
| 72 | #include <linux/fs.h> | |
| 73 | #include <linux/string.h> | |
| 2b6b5caa | 74 | #include <linux/slab.h> |
| bc22c17e AK |
75 | #include <linux/vmalloc.h> |
| 76 | ||
| 77 | /* Use defines rather than static inline in order to avoid spurious | |
| 78 | * warnings when not needed (indeed large_malloc / large_free are not | |
| 79 | * needed by inflate */ | |
| 80 | ||
| 81 | #define malloc(a) kmalloc(a, GFP_KERNEL) | |
| 82 | #define free(a) kfree(a) | |
| 83 | ||
| 84 | #define large_malloc(a) vmalloc(a) | |
| 85 | #define large_free(a) vfree(a) | |
| 86 | ||
| bc22c17e AK |
87 | #define INIT __init |
| 88 | #define STATIC | |
| 89 | ||
| 90 | #include <linux/init.h> | |
| 91 | ||
| 92 | #endif /* STATIC */ | |
| 93 | ||
| 94 | #endif /* DECOMPR_MM_H */ |