69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
/*
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* linux/compr_mm.h
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*
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* Memory management for pre-boot and ramdisk uncompressors
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*
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* Authors: Alain Knaff <alain@knaff.lu>
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*
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*/
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#ifndef DECOMPR_MM_H
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#define DECOMPR_MM_H
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#ifdef STATIC
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/* Code active when included from pre-boot environment: */
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/*
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* Some architectures want to ensure there is no local data in their
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* pre-boot environment, so that data can arbitrarily relocated (via
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* GOT references). This is achieved by defining STATIC_RW_DATA to
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* be null.
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*/
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#ifndef STATIC_RW_DATA
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#define STATIC_RW_DATA static
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#endif
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/* A trivial malloc implementation, adapted from
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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*/
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STATIC_RW_DATA unsigned long malloc_ptr;
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STATIC_RW_DATA int malloc_count;
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static void *malloc(int size)
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{
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void *p;
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if (size < 0)
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return NULL;
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if (!malloc_ptr)
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malloc_ptr = free_mem_ptr;
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malloc_ptr = (malloc_ptr + 3) & ~3; /* Align */
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p = (void *)malloc_ptr;
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malloc_ptr += size;
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if (free_mem_end_ptr && malloc_ptr >= free_mem_end_ptr)
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return NULL;
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malloc_count++;
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return p;
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}
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static void free(void *where)
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{
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malloc_count--;
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if (!malloc_count)
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malloc_ptr = free_mem_ptr;
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}
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#define large_malloc(a) malloc(a)
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#define large_free(a) free(a)
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#define INIT
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#endif /* STATIC */
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#endif /* DECOMPR_MM_H */
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