/* SPDX-License-Identifier: GPL-2.0 */
|
/*
|
* linux/compr_mm.h
|
*
|
* Memory management for pre-boot and ramdisk uncompressors
|
*
|
* Authors: Alain Knaff <alain@knaff.lu>
|
*
|
*/
|
|
#ifndef DECOMPR_MM_H
|
#define DECOMPR_MM_H
|
|
#ifdef STATIC
|
|
/* Code active when included from pre-boot environment: */
|
|
/*
|
* Some architectures want to ensure there is no local data in their
|
* pre-boot environment, so that data can arbitrarily relocated (via
|
* GOT references). This is achieved by defining STATIC_RW_DATA to
|
* be null.
|
*/
|
#ifndef STATIC_RW_DATA
|
#define STATIC_RW_DATA static
|
#endif
|
|
/* A trivial malloc implementation, adapted from
|
* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
|
*/
|
STATIC_RW_DATA unsigned long malloc_ptr;
|
STATIC_RW_DATA int malloc_count;
|
|
static void *malloc(int size)
|
{
|
void *p;
|
|
if (size < 0)
|
return NULL;
|
if (!malloc_ptr)
|
malloc_ptr = free_mem_ptr;
|
|
malloc_ptr = (malloc_ptr + 3) & ~3; /* Align */
|
|
p = (void *)malloc_ptr;
|
malloc_ptr += size;
|
|
if (free_mem_end_ptr && malloc_ptr >= free_mem_end_ptr)
|
return NULL;
|
|
malloc_count++;
|
return p;
|
}
|
|
static void free(void *where)
|
{
|
malloc_count--;
|
if (!malloc_count)
|
malloc_ptr = free_mem_ptr;
|
}
|
|
#define large_malloc(a) malloc(a)
|
#define large_free(a) free(a)
|
|
#define INIT
|
|
#else /* STATIC */
|
|
/* Code active when compiled standalone for use when loading ramdisk: */
|
|
#include <linux/kernel.h>
|
#include <linux/fs.h>
|
#include <linux/string.h>
|
#include <linux/slab.h>
|
#include <linux/vmalloc.h>
|
|
/* Use defines rather than static inline in order to avoid spurious
|
* warnings when not needed (indeed large_malloc / large_free are not
|
* needed by inflate */
|
|
#define malloc(a) kmalloc(a, GFP_KERNEL)
|
#define free(a) kfree(a)
|
|
#define large_malloc(a) vmalloc(a)
|
#define large_free(a) vfree(a)
|
|
#define INIT __init
|
#define STATIC
|
|
#include <linux/init.h>
|
|
#endif /* STATIC */
|
|
#endif /* DECOMPR_MM_H */
|
