xref: /minix3/minix/lib/libsys/alloc_util.c (revision 5c8eb53d493565d6ee17388b493fd6a0b4d85c12)
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2433d6423SLionel Sambuc #include "syslib.h"
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4433d6423SLionel Sambuc #include <stdlib.h>
5433d6423SLionel Sambuc #include <errno.h>
6433d6423SLionel Sambuc #include <sys/mman.h>
7433d6423SLionel Sambuc #include <minix/sysutil.h>
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alloc_contig(size_t len,int flags,phys_bytes * phys)9433d6423SLionel Sambuc void *alloc_contig(size_t len, int flags, phys_bytes *phys)
10433d6423SLionel Sambuc {
11*5c8eb53dSCristiano Giuffrida 	void* buf;
12433d6423SLionel Sambuc 	int mmapflags = MAP_PREALLOC|MAP_CONTIG|MAP_ANON;
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14433d6423SLionel Sambuc 	if(flags & AC_LOWER16M)
15433d6423SLionel Sambuc 		mmapflags |= MAP_LOWER16M;
16433d6423SLionel Sambuc 	if(flags & AC_LOWER1M)
17433d6423SLionel Sambuc 		mmapflags |= MAP_LOWER1M;
18433d6423SLionel Sambuc 	if(flags & AC_ALIGN64K)
19433d6423SLionel Sambuc 		mmapflags |= MAP_ALIGNMENT_64KB;
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21433d6423SLionel Sambuc 	/* First try to get memory with mmap. This is guaranteed
22433d6423SLionel Sambuc 	 * to be page-aligned, and we can tell VM it has to be
23433d6423SLionel Sambuc 	 * pre-allocated and contiguous.
24433d6423SLionel Sambuc 	 */
25433d6423SLionel Sambuc 	errno = 0;
26*5c8eb53dSCristiano Giuffrida 	buf = sef_llvm_ac_mmap(0, len, PROT_READ|PROT_WRITE, mmapflags, -1, 0);
27*5c8eb53dSCristiano Giuffrida 	if(buf == MAP_FAILED) {
28433d6423SLionel Sambuc 		return NULL;
29433d6423SLionel Sambuc 	}
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31433d6423SLionel Sambuc 	/* Get physical address, if requested. */
32*5c8eb53dSCristiano Giuffrida         if(phys != NULL && sys_umap(SELF, VM_D, (vir_bytes)buf, len,
33*5c8eb53dSCristiano Giuffrida 	    phys) != OK)
34433d6423SLionel Sambuc 		panic("sys_umap_data_fb failed");
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36*5c8eb53dSCristiano Giuffrida 	return buf;
37433d6423SLionel Sambuc }
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free_contig(void * addr,size_t len)39433d6423SLionel Sambuc int free_contig(void *addr, size_t len)
40433d6423SLionel Sambuc {
41*5c8eb53dSCristiano Giuffrida 	return sef_llvm_ac_munmap(addr, len);
42433d6423SLionel Sambuc }
43433d6423SLionel Sambuc 
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