-/* uba.c 4.10 %G% */
+/* uba.c 4.11 %G% */
+
+#define DELAY(N) { register int d; d = N; while (--d > 0); }
#include "../h/param.h"
#include "../h/systm.h"
#include "../h/map.h"
#include "../h/pte.h"
#include "../h/buf.h"
+#include "../h/vm.h"
#include "../h/uba.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/proc.h"
-#include "../h/vm.h"
#include "../h/conf.h"
#include "../h/mtpr.h"
#include "../h/nexus.h"
+#include "../h/dk.h"
+
+/*
+ * Do transfer on device argument. The controller
+ * and uba involved are implied by the device.
+ * We queue for resource wait in the uba code if necessary.
+ * We return 1 if the transfer was started, 0 if it was not.
+ * If you call this routine with the head of the queue for a
+ * UBA, it will automatically remove the device from the UBA
+ * queue before it returns. If some other device is given
+ * as argument, it will be added to the request queue if the
+ * request cannot be started immediately. This means that
+ * passing a device which is on the queue but not at the head
+ * of the request queue is likely to be a disaster.
+ */
+ubago(ui)
+ register struct uba_dinfo *ui;
+{
+ register struct uba_minfo *um = ui->ui_mi;
+ register struct uba_hd *uh;
+ register int s, unit;
+
+ uh = &uba_hd[um->um_ubanum];
+ s = spl6();
+ um->um_ubinfo = ubasetup(um->um_ubanum, um->um_tab.b_actf->b_actf,
+ UBA_NEEDBDP|UBA_CANTWAIT);
+ if (um->um_ubinfo == 0) {
+ if (uh->uh_actf != ui) {
+ ui->ui_forw = NULL;
+ if (uh->uh_actf == NULL)
+ uh->uh_actf = ui;
+ else
+ uh->uh_actl->ui_forw = ui;
+ uh->uh_actl = ui;
+ }
+ splx(s);
+ return (0);
+ }
+ splx(s);
+ if (ui->ui_dk >= 0) {
+ unit = ui->ui_dk;
+ dk_busy |= 1<<unit;
+ }
+ if (uh->uh_actf == ui)
+ uh->uh_actf = ui->ui_forw;
+ (*um->um_driver->ud_dgo)(um);
+ if (ui->ui_dk >= 0) {
+ dk_xfer[unit]++;
+ dk_wds[unit] += um->um_tab.b_actf->b_bcount>>6;
+ }
+ return (1);
+}
/*
* Allocate and setup UBA map registers, and bdp's
* Flags says whether bdp is needed, whether the caller can't
* wait (e.g. if the caller is at interrupt level).
*
- * Return value (cruft):
+ * Return value:
* Bits 0-8 Byte offset
* Bits 9-17 Start map reg. no.
* Bits 18-27 No. mapping reg's
}
/*
- * Non buffer unibus interface... set up a buffer and call ubasetup.
+ * Non buffer setup interface... set up a buffer and call ubasetup.
*/
uballoc(uban, addr, bcnt, flags)
caddr_t addr;
}
/*
- * Old ubafree(info) is now ubarelse(&info) to avoid races.
+ * Release resources on uba uban, and then unblock resource waiters.
+ * The map register parameter is by value since we need to block
+ * against uba resets on 11/780's.
*/
ubarelse(uban, amr)
int *amr;
{
register struct uba_hd *uh = &uba_hd[uban];
- register int bdp, reg, npf, a;
+ register int bdp, reg, npf, s;
int mr;
- a = spl6();
+ /*
+ * Carefully see if we should release the space, since
+ * it may be released asynchronously at uba reset time.
+ */
+ s = spl6();
mr = *amr;
if (mr == 0) {
- splx(a);
+ /*
+ * A ubareset() occurred before we got around
+ * to releasing the space... no need to bother.
+ */
+ splx(s);
return;
}
*amr = 0;
+ splx(s); /* let interrupts in, we're safe for a while */
bdp = (mr >> 28) & 0x0f;
if (bdp) {
switch (cpu)
break;
#endif
}
- uh->uh_bdpfree |= 1 << (bdp-1);
+ uh->uh_bdpfree |= 1 << (bdp-1); /* atomic */
if (uh->uh_bdpwant) {
uh->uh_bdpwant = 0;
wakeup((caddr_t)uh->uh_map);
}
}
+ /*
+ * Put back the registers in the resource map.
+ * The map code must not be reentered, so we do this
+ * at high ipl.
+ */
npf = (mr >> 18) & 0x3ff;
reg = ((mr >> 9) & 0x1ff) + 1;
+ s = spl6();
mfree(uh->uh_map, npf, reg);
+ splx(s);
+
+ /*
+ * Wakeup sleepers for map registers,
+ * and also, if there are processes blocked in dgo(),
+ * give them a chance at the UNIBUS.
+ */
if (uh->uh_mrwant) {
uh->uh_mrwant = 0;
wakeup((caddr_t)uh->uh_map);
}
- splx(a);
+ while (uh->uh_actf && ubago(uh->uh_actf))
+ ;
}
-#define DELAY(N) { register int d; d = N; while (--d > 0); }
-
+/*
+ * Generate a reset on uba number uban. Then
+ * call each device in the character device table,
+ * giving it a chance to clean up so as to be able to continue.
+ */
ubareset(uban)
+ int uban;
{
register struct cdevsw *cdp;
int s;
splx(s);
}
-/* pointer rather than number so we can be called with virt and phys addrs */
+/*
+ * Init a uba. This is called with a pointer
+ * rather than a virtual address since it is called
+ * by code which runs with memory mapping disabled.
+ * In these cases we really don't need the interrupts
+ * enabled, but since we run with ipl high, we don't care
+ * if they are, they will never happen anyways.
+ */
ubainit(uba)
register struct uba_regs *uba;
{
}
#if VAX780
+/*
+ * Check to make sure the UNIBUS adaptor is not hung,
+ * with an interrupt in the register to be presented,
+ * but not presenting it for an extended period (5 seconds).
+ */
unhang()
{
register int uban;
}
}
-/* timeout routine to decrement ``i forgot to interrupt counts */
-/* this prevents the counts from growing slowly, which isn't interesting */
+/*
+ * This is a timeout routine which decrements the ``i forgot to
+ * interrupt'' counts, on an 11/780. This prevents slowly growing
+ * counts from causing a UBA reset since we are interested only
+ * in hang situations.
+ */
ubawatch()
{
register struct uba_hd *uh;
}
}
-/* called from locore.s; parameters here (i.e. uvec) are value-result! */
+/*
+ * This routine is called by the locore code to
+ * process a UBA error on an 11/780. The arguments are passed
+ * on the stack, and value-result (through some trickery).
+ * In particular, the uvec argument is used for further
+ * uba processing so the result aspect of it is very important.
+ * It must not be declared register.
+ */
/*ARGSUSED*/
ubaerror(uban, uh, xx, uvec, uba)
register int uban;