44 lines
951 B
C
44 lines
951 B
C
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#include "syslib.h"
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <minix/sysutil.h>
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void *alloc_contig(size_t len, int flags, phys_bytes *phys)
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{
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vir_bytes buf;
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int mmapflags = MAP_PREALLOC|MAP_CONTIG|MAP_ANON;
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if(flags & AC_LOWER16M)
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mmapflags |= MAP_LOWER16M;
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if(flags & AC_LOWER1M)
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mmapflags |= MAP_LOWER1M;
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if(flags & AC_ALIGN64K)
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mmapflags |= MAP_ALIGNMENT_64KB;
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/* First try to get memory with mmap. This is guaranteed
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* to be page-aligned, and we can tell VM it has to be
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* pre-allocated and contiguous.
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*/
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errno = 0;
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buf = (vir_bytes) mmap(0, len, PROT_READ|PROT_WRITE, mmapflags, -1, 0);
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if(buf == (vir_bytes) MAP_FAILED) {
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return NULL;
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}
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/* Get physical address, if requested. */
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if(phys != NULL && sys_umap(SELF, VM_D, buf, len, phys) != OK)
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panic("sys_umap_data_fb failed");
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return (void *) buf;
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}
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int free_contig(void *addr, size_t len)
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{
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return munmap(addr, len);
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}
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