New MEM driver for recovery.

drivers/at_wini/at_wini.c

@@ -6,7 +6,7 @@
  *   at_winchester_task:	main entry when system is brought up
  *
  * Changes:
- *   Aug 19, 2005   ata pci support, supports SATA  (Ben Gras)
+ *   Aug 19, 2005   ATA PCI support, supports SATA  (Ben Gras)
  *   Nov 18, 2004   moved AT disk driver to user-space  (Jorrit N. Herder)
  *   Aug 20, 2004   watchdogs replaced by sync alarms  (Jorrit N. Herder)
  *   Mar 23, 2000   added ATAPI CDROM support  (Michael Temari)
@@ -194,8 +194,8 @@ int w_next_drive = 0;
 
 /* Variables. */
 
-/* wini is indexed by controller first, then drive (0-3).
+/* The struct wini is indexed by controller first, then drive (0-3).
- * controller 0 is always the 'compatability' ide controller, at
+ * Controller 0 is always the 'compatability' ide controller, at
  * the fixed locations, whether present or not.
  */
 PRIVATE struct wini {		/* main drive struct, one entry per drive */
@@ -235,7 +235,8 @@ PRIVATE int w_controller;		/* selected controller */
 PRIVATE struct device *w_dv;		/* device's base and size */
 
 FORWARD _PROTOTYPE( void init_params, (void) 				);
-FORWARD _PROTOTYPE( void init_drive, (struct wini *, int, int, int, int, int, int));
+FORWARD _PROTOTYPE( void init_drive, (struct wini *, int, int, int, 
+					int, int, int));
 FORWARD _PROTOTYPE( void init_params_pci, (int) 			);
 FORWARD _PROTOTYPE( int w_do_open, (struct driver *dp, message *m_ptr) 	);
 FORWARD _PROTOTYPE( struct device *w_prepare, (int dev) 		);

drivers/libdriver/driver.c

@@ -99,7 +99,6 @@ struct driver *dp;	/* Device dependent entry points. */
 	case DEV_IOCTL:		r = (*dp->dr_ioctl)(dp, &mess);	break;
 	case CANCEL:		r = (*dp->dr_cancel)(dp, &mess);break;
 	case DEV_SELECT:	r = (*dp->dr_select)(dp, &mess);break;
-
 	case DEV_READ:	
 	case DEV_WRITE:	  	r = do_rdwt(dp, &mess);	break;
 	case DEV_GATHER: 
@@ -138,6 +137,7 @@ struct driver *dp;	/* Device dependent entry points. */
   }
 }
 
+
 /*===========================================================================*
  *				init_buffer				     *
  *===========================================================================*/

drivers/memory/memory.c

@@ -205,12 +205,8 @@ PRIVATE int m_do_open(dp, m_ptr)
 struct driver *dp;
 message *m_ptr;
 {
-/* Check device number on open.  (This used to give I/O privileges to a 
+/* Check device number on open. */
- * process opening /dev/mem or /dev/kmem. This may be needed in case of 
- * memory mapped I/O. With system calls to do I/O this is no longer needed.)
- */
   if (m_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
-
   return(OK);
 }
 
@@ -220,6 +216,9 @@ message *m_ptr;
 PRIVATE void m_init()
 {
   /* Initialize this task. All minor devices are initialized one by one. */
+  phys_bytes ramdev_size;
+  phys_bytes ramdev_base;
+  message m;
   int i, s;
 
   if (OK != (s=sys_getkinfo(&kinfo))) {
@@ -244,6 +243,22 @@ PRIVATE void m_init()
       }
   }
 
+  /* See if there are already RAM disk details at the Data Store server. */
+  m.DS_KEY = MEMORY_MAJOR;
+  if (OK == (s = _taskcall(DS_PROC_NR, DS_RETRIEVE, &m))) {
+  	ramdev_size = m.DS_VAL_L1;
+ 	ramdev_base = m.DS_VAL_L2;
+  	printf("MEM retrieved size %u and base %u from DS, status %d\n",
+    		ramdev_size, ramdev_base, s);
+  	if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s, 
+		(vir_bytes *) &s, ramdev_base, ramdev_size))) {
+      		panic("MEM","Couldn't install remote segment.",s);
+  	}
+  	m_geom[RAM_DEV].dv_base = cvul64(ramdev_base);
+ 	m_geom[RAM_DEV].dv_size = cvul64(ramdev_size);
+	printf("MEM stored retrieved details as new RAM disk\n");
+  }
+
   /* Initialize /dev/zero. Simply write zeros into the buffer. */
   for (i=0; i<ZERO_BUF_SIZE; i++) {
        dev_zero[i] = '\0';
@@ -283,19 +298,19 @@ message *m_ptr;				/* pointer to control message */
  * - MIOCRAMSIZE: to set the size of the RAM disk.
  */
   struct device *dv;
-  if ((dv = m_prepare(m_ptr->DEVICE)) == NIL_DEV) return(ENXIO);
 
   switch (m_ptr->REQUEST) {
     case MIOCRAMSIZE: {
 	/* FS wants to create a new RAM disk with the given size. */
 	phys_bytes ramdev_size;
 	phys_bytes ramdev_base;
+	message m;
 	int s;
 
-	if (m_ptr->PROC_NR != FS_PROC_NR) {
+	/* Only FS can create RAM disk, and only on RAM disk device. */
-	    report("MEM", "warning, MIOCRAMSIZE called by", m_ptr->PROC_NR);
+	if (m_ptr->PROC_NR != FS_PROC_NR) return(EPERM);
-	    return(EPERM);
+	if (m_ptr->DEVICE != RAM_DEV) return(EINVAL);
-	}
+        if ((dv = m_prepare(m_ptr->DEVICE)) == NIL_DEV) return(ENXIO);
 
 	/* Try to allocate a piece of memory for the RAM disk. */
 	ramdev_size = m_ptr->POSITION;
@@ -303,13 +318,26 @@ message *m_ptr;				/* pointer to control message */
             report("MEM", "warning, allocmem failed", errno);
             return(ENOMEM);
         }
-	dv->dv_base = cvul64(ramdev_base);
-	dv->dv_size = cvul64(ramdev_size);
 
-  	if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s, (vir_bytes *) &s, 
+	/* Store the values we got in the data store so we can retrieve
-  		ramdev_base, ramdev_size))) {
+	 * them later on, in the unfortunate event of a crash.
+	 */
+	m.DS_KEY = MEMORY_MAJOR;
+	m.DS_VAL_L1 = ramdev_size;
+	m.DS_VAL_L2 = ramdev_base;
+	if (OK != (s = _taskcall(DS_PROC_NR, DS_PUBLISH, &m))) {
+      		panic("MEM","Couldn't store RAM disk details at DS.",s);
+	}
+	printf("MEM stored size %u and base %u at DS, status %d\n",
+	    ramdev_size, ramdev_base, s);
+
+  	if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s, 
+		(vir_bytes *) &s, ramdev_base, ramdev_size))) {
       		panic("MEM","Couldn't install remote segment.",s);
   	}
+
+	dv->dv_base = cvul64(ramdev_base);
+	dv->dv_size = cvul64(ramdev_size);
 	break;
     }
     case MIOCMAP:
@@ -329,7 +357,6 @@ message *m_ptr;				/* pointer to control message */
 		return r;
 	r= sys_vm_map(m_ptr->PROC_NR, do_map,
 		(phys_bytes)mapreq.base, mapreq.size, mapreq.offset);
-	printf("m_ioctl MIOC(UN)MAP: result %d\n", r);
 	return r;
     }