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 */ 30 STATIC_RW_DATA unsigned long malloc_ptr; 31 STATIC_RW_DATA int malloc_count; 32 malloc(int size)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 free(void * where)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