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| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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/* 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
/*
* When an architecture needs to share the malloc()/free() implementation
* between compilation units, it needs to have non-local visibility.
*/
#ifndef MALLOC_VISIBLE
#define MALLOC_VISIBLE 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;
MALLOC_VISIBLE void *malloc(int size)
{
void *p;
if (size < 0)
return NULL;
if (!malloc_ptr)
malloc_ptr = free_mem_ptr;
malloc_ptr = (malloc_ptr + 7) & ~7; /* 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;
}
MALLOC_VISIBLE 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 */