Main changes: - COW optimization for safecopy. - safemap, a grant-based interface for sharing memory regions between processes. - Integration with safemap and complete rework of DS, supporting new data types natively (labels, memory ranges, memory mapped ranges). - For further information: http://wiki.minix3.org/en/SummerOfCode2009/MemoryGrants Additional changes not included in the original Wu's branch: - Fixed unhandled case in VM when using COW optimization for safecopy in case of a block that has already been shared as SMAP. - Better interface and naming scheme for sys_saferevmap and ds_retrieve_map calls. - Better input checking in syslib: check for page alignment when creating memory mapping grants. - DS notifies subscribers when an entry is deleted. - Documented the behavior of indirect grants in case of memory mapping. - Test suite in /usr/src/test/safeperf|safecopy|safemap|ds/* reworked and extended. - Minor fixes and general cleanup. - TO-DO: Grant ids should be generated and managed the way endpoints are to make sure grant slots are never misreused.
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
#include "inc.h"
|
|
|
|
char buf_buf[BUF_SIZE + CLICK_SIZE];
|
|
|
|
/* SEF functions and variables. */
|
|
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
|
|
|
|
/*===========================================================================*
|
|
* main *
|
|
*===========================================================================*/
|
|
int main(int argc, char **argv)
|
|
{
|
|
endpoint_t ep_self, ep_requestor;
|
|
int fid_send, fid_get;
|
|
cp_grant_id_t gid;
|
|
char *buf;
|
|
int i;
|
|
|
|
/* SEF local startup. */
|
|
env_setargs(argc, argv);
|
|
sef_local_startup();
|
|
|
|
/* Prepare work. */
|
|
buf = (char*) CLICK_CEIL(buf_buf);
|
|
fid_send = open(FIFO_GRANTOR, O_WRONLY);
|
|
fid_get = open(FIFO_REQUESTOR, O_RDONLY);
|
|
if(fid_get < 0 || fid_send < 0) {
|
|
printf("GRANTOR: can't open fifo files.\n");
|
|
return 1;
|
|
}
|
|
buf[0] = BUF_START;
|
|
|
|
/* Get the requestor's endpoint. */
|
|
read(fid_get, &ep_requestor, sizeof(ep_requestor));
|
|
dprint("GRANTOR: getting requestor's endpoint: %d\n", ep_requestor);
|
|
|
|
/* Grant. */
|
|
gid = cpf_grant_direct(ep_requestor, (long)buf, BUF_SIZE,
|
|
CPF_READ | CPF_WRITE);
|
|
ep_self = getprocnr();
|
|
dprint("GRANTOR: sending my endpoint %d and gid %d\n", ep_self, gid);
|
|
write(fid_send, &ep_self, sizeof(ep_self));
|
|
write(fid_send, &gid, sizeof(gid));
|
|
|
|
/* Wait till requestor is done. */
|
|
FIFO_WAIT(fid_get);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* sef_local_startup *
|
|
*===========================================================================*/
|
|
PRIVATE void sef_local_startup()
|
|
{
|
|
/* Let SEF perform startup. */
|
|
sef_startup();
|
|
}
|
|
|