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 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 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 set_error_fn(x) 65 66#define INIT 67 68#else /* STATIC */ 69 70/* Code active when compiled standalone for use when loading ramdisk: */ 71 72#include <linux/kernel.h> 73#include <linux/fs.h> 74#include <linux/string.h> 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 87static void(*error)(char *m); 88#define set_error_fn(x) error = x; 89 90#define INIT __init 91#define STATIC 92 93#include <linux/init.h> 94 95#endif /* STATIC */ 96 97#endif /* DECOMPR_MM_H */ 98