c5b309ff07
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.
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
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#define _SYSTEM 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/safecopies.h>
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#include <minix/bitmap.h>
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#include <minix/vm.h>
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#include <minix/ds.h>
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#include <errno.h>
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#include <string.h>
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#include <env.h>
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#include <stdio.h>
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#include "glo.h"
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#include "proto.h"
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#include "util.h"
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struct query_exit_struct {
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int avail;
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endpoint_t ep;
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};
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static struct query_exit_struct array[NR_PROCS];
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/*===========================================================================*
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* do_query_exit *
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*===========================================================================*/
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PUBLIC int do_query_exit(message *m)
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{
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int i, nr;
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endpoint_t ep;
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for (i = 0; i < NR_PROCS; i++) {
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if (!array[i].avail) {
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array[i].avail = 1;
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ep = array[i].ep;
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array[i].ep = 0;
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break;
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}
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}
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nr = 0;
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for (i = 0; i < NR_PROCS; i++) {
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if (!array[i].avail)
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nr++;
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}
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m->VM_QUERY_RET_PT = ep;
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m->VM_QUERY_IS_MORE = (nr > 0);
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return OK;
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}
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/*===========================================================================*
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* do_notify_sig *
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*===========================================================================*/
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PUBLIC int do_notify_sig(message *m)
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{
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int i, avails = 0;
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endpoint_t ep = m->VM_NOTIFY_SIG_ENDPOINT;
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endpoint_t ipc_ep = m->VM_NOTIFY_SIG_IPC;
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int r;
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for (i = 0; i < NR_PROCS; i++) {
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/* its signal is already here */
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if (!array[i].avail && array[i].ep == ep)
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goto out;
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if (array[i].avail)
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avails++;
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}
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if (!avails) {
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/* no slot for signals, impossible */
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printf("VM: no slot for signals!\n");
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return ENOMEM;
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}
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for (i = 0; i < NR_PROCS; i++) {
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if (array[i].avail) {
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array[i].avail = 0;
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array[i].ep = ep;
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break;
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}
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}
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out:
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/* only care when IPC server starts up,
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* and bypass the process to be signal is IPC itself.
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*/
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if (ipc_ep != 0 && ep != ipc_ep) {
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r = notify(ipc_ep);
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if (r != OK)
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printf("VM: notify IPC error!\n");
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}
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return OK;
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}
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/*===========================================================================*
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* init_query_exit *
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*===========================================================================*/
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PUBLIC void init_query_exit(void)
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{
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int i;
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for (i = 0; i < NR_PROCS; i++) {
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array[i].avail = 1;
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array[i].ep = 0;
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}
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}
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