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