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/*
* The easiest way to deal with the need for DVMA mappings is
* to just map the first four megabytes of RAM into DVMA space.
* That way, dvma_mapin can just compute the DVMA alias address,
* and dvma_mapout does nothing.
*/
#include <sys/param.h>
#define DVMA_BASE 0x00000000
#define DVMA_MASK 0x00ffFFff
#define DVMA_MAPLEN 0x400000 /* 4 MB */
void
dvma_init()
{
#if 0
int segva, sme;
for (segva = 0; segva < DVMA_MAPLEN; segva += NBSG) {
sme = get_segmap(segva);
set_segmap((DVMA_BASE | segva), sme);
}
#endif
}
/* Convert a local address to a DVMA address. */
char *
dvma_mapin(char *addr, int len)
{
int va = (int)addr;
va |= DVMA_BASE;
return ((char *) va);
}
/* Convert a DVMA address to a local address. */
char *
dvma_mapout(char *dmabuf, int len)
{
if (dmabuf < (char*)DVMA_BASE)
panic("dvma_mapout");
return (dmabuf - DVMA_BASE);
}
extern char *alloc(int len);
char *
dvma_alloc(int len)
{
char *mem;
mem = alloc(len);
if (!mem)
return(mem);
return(dvma_mapin(mem, len));
}
extern void free(void *ptr, int len);
void
dvma_free(char *dvma, int len)
{
char *mem;
mem = dvma_mapout(dvma, len);
if (mem)
free(mem, len);
}
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