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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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2.1 kB · 102 lines
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at master
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103/* 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 */