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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* 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 __maybe_unused void *simple_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 __maybe_unused void simple_free(void *where)
{
malloc_count--;
if (!malloc_count)
malloc_ptr = free_mem_ptr;
}
#define large_malloc(a) simple_malloc(a)
#define large_free(a) simple_free(a)
#define MALLOC simple_malloc
#define FREE simple_free
#define INIT
#endif /* STATIC */
#endif /* DECOMPR_MM_H */
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