diff options
author | bde <bde@FreeBSD.org> | 1995-07-31 18:29:51 +0000 |
---|---|---|
committer | bde <bde@FreeBSD.org> | 1995-07-31 18:29:51 +0000 |
commit | 105a5302c8d514bac00d9a43e536c2d1cf348e7f (patch) | |
tree | 26124f1c54e97a50cf900004855d0d8008f3b9da /sys/i386/isa | |
parent | 8169a9d300540831666cae03b26a062efb5e28c2 (diff) | |
download | FreeBSD-src-105a5302c8d514bac00d9a43e536c2d1cf348e7f.zip FreeBSD-src-105a5302c8d514bac00d9a43e536c2d1cf348e7f.tar.gz |
Improve input flow control.
Use input buffer watermarks of TTYHOG-512 (high) and (high)*7/8
(low) instead of TTYHOG/2 (high) and TTYHOG/5 (low) to agree with
some drivers. 512 is magic and some things depended on TTYHOG/2
>= TTYHOG-512 to work; now they depend on the 512 magic not changing
and TTYHOG-512 being significantly larger than 0. This should be
handled in ttsetwater().
Separate the decision about whether to do input flow control from
doing it. ttyblock() now just starts input flow control (hardware
and/or software) and there is a new function ttyunblock() to stop
it. The decisions are the same except for the watermark changes
and allowing for input expansion for PARMRK.
When flushing input, try harder at first to send a start character
if required, but give up if the first attempt fails.
cy.c, rc.c, sio.c:
Simplify: let ttyinput() handle input flow control if it is not
being bypassed. Use ttyblock() to start flow control otherwise.
rc.c:
Use same input flow control test as elsewhere: test in a more
efficient order and start flow control at >= highwater instead of
at > highwater.
Diffstat (limited to 'sys/i386/isa')
-rw-r--r-- | sys/i386/isa/cy.c | 32 | ||||
-rw-r--r-- | sys/i386/isa/rc.c | 20 | ||||
-rw-r--r-- | sys/i386/isa/sio.c | 32 |
3 files changed, 16 insertions, 68 deletions
diff --git a/sys/i386/isa/cy.c b/sys/i386/isa/cy.c index bd8d7a49..7852317 100644 --- a/sys/i386/isa/cy.c +++ b/sys/i386/isa/cy.c @@ -27,7 +27,7 @@ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: cy.c,v 1.12 1995/07/29 04:05:53 bde Exp $ + * $Id: cy.c,v 1.13 1995/07/29 08:33:06 bde Exp $ */ #include "cy.h" @@ -1599,31 +1599,6 @@ repeat: if (incc <= 0 || !(tp->t_state & TS_ISOPEN)) continue; /* - * XXX only do this when we bypass ttyinput. - */ - if (tp->t_rawq.c_cc + incc >= RB_I_HIGH_WATER - && (com->state & CS_RTS_IFLOW || tp->t_iflag & IXOFF) - && !(tp->t_state & TS_TBLOCK) - /* - * XXX - need flow control for all line disciplines. - * Only have it in standard one now. - */ - && linesw[tp->t_line].l_rint == ttyinput) { - int putc_status = 0; - - if ((tp->t_iflag & IXOFF - && tp->t_cc[VSTOP] != _POSIX_VDISABLE - && (putc_status = putc(tp->t_cc[VSTOP], - &tp->t_outq)) == 0) - || com->state & CS_RTS_IFLOW) { - tp->t_state |= TS_TBLOCK; - ttstart(tp); - if (putc_status != 0) - /* Try again later. */ - tp->t_state &= ~TS_TBLOCK; - } - } - /* * Avoid the grotesquely inefficient lineswitch routine * (ttyinput) in "raw" mode. It usually takes about 450 * instructions (that's without canonical processing or echo!). @@ -1631,6 +1606,11 @@ repeat: * call overhead). */ if (tp->t_state & TS_CAN_BYPASS_L_RINT) { + if (tp->t_rawq.c_cc + incc >= RB_I_HIGH_WATER + && (com->state & CS_RTS_IFLOW + || tp->t_iflag & IXOFF) + && !(tp->t_state & TS_TBLOCK)) + ttyblock(tp); tk_nin += incc; tk_rawcc += incc; tp->t_rawcc += incc; diff --git a/sys/i386/isa/rc.c b/sys/i386/isa/rc.c index ec93d68..1e9f666 100644 --- a/sys/i386/isa/rc.c +++ b/sys/i386/isa/rc.c @@ -664,24 +664,12 @@ repeat: if (icnt <= 0 || !(tp->t_state & TS_ISOPEN)) goto done1; - if ( linesw[tp->t_line].l_rint == ttyinput - && ((rc->rc_flags & RC_RTSFLOW) || (tp->t_iflag & IXOFF)) - && !(tp->t_state & TS_TBLOCK) - && (tp->t_rawq.c_cc + icnt) > RB_I_HIGH_WATER) { - int queue_full = 0; - - if ((tp->t_iflag & IXOFF) && - tp->t_cc[VSTOP] != _POSIX_VDISABLE && - (queue_full = putc(tp->t_cc[VSTOP], &tp->t_outq)) == 0 || - (rc->rc_flags & RC_RTSFLOW)) { - tp->t_state |= TS_TBLOCK; - ttstart(tp); - if (queue_full) /* try again */ - tp->t_state &= ~TS_TBLOCK; - } - } if ( (tp->t_state & TS_CAN_BYPASS_L_RINT) && !(tp->t_state & TS_LOCAL)) { + if ((tp->t_rawq.c_cc + icnt) >= RB_I_HIGH_WATER + && ((rc->rc_flags & RC_RTSFLOW) || (tp->t_iflag & IXOFF)) + && !(tp->t_state & TS_TBLOCK)) + ttyblock(tp); tk_nin += icnt; tk_rawcc += icnt; tp->t_rawcc += icnt; diff --git a/sys/i386/isa/sio.c b/sys/i386/isa/sio.c index a428eeb..97f9dd7 100644 --- a/sys/i386/isa/sio.c +++ b/sys/i386/isa/sio.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * from: @(#)com.c 7.5 (Berkeley) 5/16/91 - * $Id: sio.c,v 1.106 1995/07/29 04:05:57 bde Exp $ + * $Id: sio.c,v 1.107 1995/07/29 08:33:13 bde Exp $ */ #include "sio.h" @@ -1548,31 +1548,6 @@ repeat: if (incc <= 0 || !(tp->t_state & TS_ISOPEN)) continue; /* - * XXX only do this when we bypass ttyinput. - */ - if (tp->t_rawq.c_cc + incc >= RB_I_HIGH_WATER - && (com->state & CS_RTS_IFLOW || tp->t_iflag & IXOFF) - && !(tp->t_state & TS_TBLOCK) - /* - * XXX - need flow control for all line disciplines. - * Only have it in standard one now. - */ - && linesw[tp->t_line].l_rint == ttyinput) { - int putc_status = 0; - - if ((tp->t_iflag & IXOFF - && tp->t_cc[VSTOP] != _POSIX_VDISABLE - && (putc_status = putc(tp->t_cc[VSTOP], - &tp->t_outq)) == 0) - || com->state & CS_RTS_IFLOW) { - tp->t_state |= TS_TBLOCK; - ttstart(tp); - if (putc_status != 0) - /* Try again later. */ - tp->t_state &= ~TS_TBLOCK; - } - } - /* * Avoid the grotesquely inefficient lineswitch routine * (ttyinput) in "raw" mode. It usually takes about 450 * instructions (that's without canonical processing or echo!). @@ -1580,6 +1555,11 @@ repeat: * call overhead). */ if (tp->t_state & TS_CAN_BYPASS_L_RINT) { + if (tp->t_rawq.c_cc + incc >= RB_I_HIGH_WATER + && (com->state & CS_RTS_IFLOW + || tp->t_iflag & IXOFF) + && !(tp->t_state & TS_TBLOCK)) + ttyblock(tp); tk_nin += incc; tk_rawcc += incc; tp->t_rawcc += incc; |