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