projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| bc22c17e AK |
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 | ||
| 5ceaa2f3 RK |
17 | /* |
| 18 | * Some architectures want to ensure there is no local data in their | |
| 19 | * pre-boot environment, so that data can arbitarily 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 | ||
| bc22c17e AK |
27 | /* A trivial malloc implementation, adapted from |
| 28 | * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994 | |
| 29 | */ | |
| 5ceaa2f3 RK |
30 | STATIC_RW_DATA unsigned long malloc_ptr; |
| 31 | STATIC_RW_DATA int malloc_count; | |
| bc22c17e AK |
32 | |
| 33 | static void *malloc(int size) | |
| 34 | { | |
| 35 | void *p; | |
| 36 | ||
| 37 | if (size < 0) | |
| c1e7c3ae | 38 | return NULL; |
| bc22c17e AK |
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) | |
| c1e7c3ae | 48 | return NULL; |
| bc22c17e AK |
49 | |
| 50 | malloc_count++; | |
| 51 | return p; | |
| 52 | } | |
| 53 | ||
| 54 | static 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 | ||
| bc22c17e AK |
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/vmalloc.h> | |
| 74 | ||
| 75 | /* Use defines rather than static inline in order to avoid spurious | |
| 76 | * warnings when not needed (indeed large_malloc / large_free are not | |
| 77 | * needed by inflate */ | |
| 78 | ||
| 79 | #define malloc(a) kmalloc(a, GFP_KERNEL) | |
| 80 | #define free(a) kfree(a) | |
| 81 | ||
| 82 | #define large_malloc(a) vmalloc(a) | |
| 83 | #define large_free(a) vfree(a) | |
| 84 | ||
| bc22c17e AK |
85 | #define INIT __init |
| 86 | #define STATIC | |
| 87 | ||
| 88 | #include <linux/init.h> | |
| 89 | ||
| 90 | #endif /* STATIC */ | |
| 91 | ||
| 92 | #endif /* DECOMPR_MM_H */ |