80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
|
|
#include "syslib.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <sys/mman.h>
|
|
#include <minix/sysutil.h>
|
|
|
|
int sys_umap_data_fb(endpoint_t ep, vir_bytes buf, vir_bytes len, phys_bytes *phys)
|
|
{
|
|
int r;
|
|
|
|
if((r=sys_umap(ep, VM_D, buf, len, phys)) != OK) {
|
|
if(r != EINVAL)
|
|
return r;
|
|
r = sys_umap(ep, D, buf, len, phys);
|
|
}
|
|
|
|
|
|
return r;
|
|
}
|
|
|
|
|
|
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_ALIGN64K;
|
|
|
|
/* First try to get memory with mmap. This is gauranteed
|
|
* 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 that failed, maybe we're not running in paged mode.
|
|
* If that's the case, ENXIO will be returned.
|
|
* Memory returned with malloc() will be preallocated and
|
|
* contiguous, so fallback on that, and ask for a little extra
|
|
* so we can page align it ourselves.
|
|
*/
|
|
if(buf == (vir_bytes) MAP_FAILED) {
|
|
u32_t align = 0;
|
|
if(errno != (_SIGN ENXIO)) {
|
|
return NULL;
|
|
}
|
|
if(flags & AC_ALIGN4K)
|
|
align = 4*1024;
|
|
if(flags & AC_ALIGN64K)
|
|
align = 64*1024;
|
|
if(len + align < len)
|
|
return NULL;
|
|
len += align;
|
|
if(!(buf = (vir_bytes) malloc(len))) {
|
|
return NULL;
|
|
}
|
|
if(align)
|
|
buf += align - (buf % align);
|
|
}
|
|
|
|
/* Get physical address, if requested. */
|
|
if(phys != NULL && sys_umap_data_fb(SELF, 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);
|
|
}
|
|
|