patch-2.1.66 linux/drivers/char/ftape/fdc-isr.c
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- Lines: 814
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.1.65/linux/drivers/char/ftape/fdc-isr.c
- Orig date:
Sat Aug 31 23:14:45 1996
diff -u --recursive --new-file v2.1.65/linux/drivers/char/ftape/fdc-isr.c linux/drivers/char/ftape/fdc-isr.c
@@ -1,813 +0,0 @@
-/*
- * Copyright (C) 1994-1995 Bas Laarhoven.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Source: /home/bas/distr/ftape-2.03b/RCS/fdc-isr.c,v $
- $Author: bas $
- *
- $Revision: 1.36 $
- $Date: 1995/05/27 08:54:21 $
- $State: Beta $
- *
- * This file contains the interrupt service routine and associated
- * code for the QIC-40/80 tape streamer device driver.
- */
-
-#include <linux/ftape.h>
-#include <asm/io.h>
-#include <asm/dma.h>
-
-#define volatile /* */
-
-#include "tracing.h"
-#include "fdc-isr.h"
-#include "qic117.h"
-#include "fdc-io.h"
-#include "ftape-ctl.h"
-#include "ftape-rw.h"
-#include "ftape-io.h"
-#include "calibr.h"
-#include "ftape-bsm.h"
-
-/* Global vars.
- */
-volatile int expected_stray_interrupts = 0;
-volatile int seek_completed = 0;
-volatile int interrupt_seen = 0;
-volatile int expect_stray_interrupt = 0;
-int random_rw = 0;
-
-/* Local vars.
- */
-typedef enum {
- no_error = 0, id_am_error = 0x01, id_crc_error = 0x02,
- data_am_error = 0x04, data_crc_error = 0x08,
- no_data_error = 0x10, overrun_error = 0x20,
-} error_cause;
-static int hide_interrupt;
-static int stop_read_ahead = 0;
-
-
-static void print_error_cause(int cause)
-{
- TRACE_FUN(8, "print_error_cause");
-
- switch (cause) {
- case no_data_error:
- TRACE(4, "no data error");
- break;
- case id_am_error:
- TRACE(4, "id am error");
- break;
- case id_crc_error:
- TRACE(4, "id crc error");
- break;
- case data_am_error:
- TRACE(4, "data am error");
- break;
- case data_crc_error:
- TRACE(4, "data crc error");
- break;
- case overrun_error:
- TRACE(4, "overrun error");
- break;
- default:
- }
- TRACE_EXIT;
-}
-
-static char *
-get_fdc_mode_text(fdc_mode_enum fdc_mode)
-{
- switch (fdc_mode) {
- case fdc_idle:
- return "fdc_idle";
- case fdc_reading_data:
- return "fdc_reading_data";
- case fdc_seeking:
- return "fdc_seeking";
- case fdc_writing_data:
- return "fdc_writing_data";
- case fdc_reading_id:
- return "fdc_reading_id";
- case fdc_recalibrating:
- return "fdc_recalibrating";
- default:
- return "unknown";
- }
-}
-
-static void
-decode_irq_cause(fdc_mode_enum fdc_mode, byte st[],
- char **fdc_mode_txt, error_cause * cause)
-{
- TRACE_FUN(8, "decode_irq_cause");
-
- /* Valid st[], decode cause of interrupt.
- */
- *fdc_mode_txt = get_fdc_mode_text(fdc_mode);
- switch (st[0] & ST0_INT_MASK) {
- case FDC_INT_NORMAL:
- TRACEx1(fdc_mode == fdc_reading_id ? 6 : 5,
- "normal completion: %s", *fdc_mode_txt);
- *cause = no_error;
- break;
- case FDC_INT_ABNORMAL:
- TRACEx1(5, "abnormal completion %s", *fdc_mode_txt);
- TRACEx3(6, "ST0: 0x%02x, ST1: 0x%02x, ST2: 0x%02x",
- st[0], st[1], st[2]);
- TRACEx4(6, "C: 0x%02x, H: 0x%02x, R: 0x%02x, N: 0x%02x",
- st[3], st[4], st[5], st[6]);
- if (st[1] & 0x01) {
- if (st[2] & 0x01) {
- *cause = data_am_error;
- } else {
- *cause = id_am_error;
- }
- } else if (st[1] & 0x20) {
- if (st[2] & 0x20) {
- *cause = data_crc_error;
- } else {
- *cause = id_crc_error;
- }
- } else if (st[1] & 0x04) {
- *cause = no_data_error;
- } else if (st[1] & 0x10) {
- *cause = overrun_error;
- }
- print_error_cause(*cause);
- break;
- case FDC_INT_INVALID:
- TRACEx1(5, "invalid completion %s", *fdc_mode_txt);
- *cause = no_error;
- break;
- case FDC_INT_READYCH:
- TRACEx1(5, "ready change %s", *fdc_mode_txt);
- *cause = no_error;
- break;
- default:
- }
- TRACE_EXIT;
-}
-
-static void update_history(error_cause cause)
-{
- switch (cause) {
- case id_am_error:
- history.id_am_errors++;
- break;
- case id_crc_error:
- history.id_crc_errors++;
- break;
- case data_am_error:
- history.data_am_errors++;
- break;
- case data_crc_error:
- history.data_crc_errors++;
- break;
- case overrun_error:
- history.overrun_errors++;
- break;
- case no_data_error:
- history.no_data_errors++;
- break;
- default:
- }
-}
-
-static void skip_bad_sector(buffer_struct * buff)
-{
- TRACE_FUN(8, "skip_bad_sector");
-
- /* Mark sector as soft error and skip it
- */
- if (buff->remaining > 0) {
- ++buff->sector_offset;
- ++buff->data_offset;
- --buff->remaining;
- buff->ptr += SECTOR_SIZE;
- buff->bad_sector_map >>= 1;
- } else {
- ++buff->sector_offset; /* hack for error maps */
- TRACE(1, "skipping last sector in segment");
- }
- TRACE_EXIT;
-}
-
-static void update_error_maps(buffer_struct * buff, unsigned error_offset)
-{
- TRACE_FUN(8, "update_error_maps");
- int hard = 0;
-
- /* error_offset is a sector offset !
- */
- if (buff->retry < SOFT_RETRIES) {
- buff->soft_error_map |= (1 << error_offset);
- } else {
- buff->hard_error_map |= (1 << error_offset);
- buff->soft_error_map &= ~buff->hard_error_map;
- buff->retry = -1; /* will be set to 0 in setup_segment */
- hard = 1;
- }
- TRACEx2(4, "sector %d : %s error", SECTOR(error_offset),
- hard ? "hard" : "soft");
- TRACEx2(5, "hard map: 0x%08lx, soft map: 0x%08lx",
- buff->hard_error_map, buff->soft_error_map);
- TRACE_EXIT;
-}
-
-/*
- * Error cause: Amount xferred: Action:
- *
- * id_am_error 0 mark bad and skip
- * id_crc_error 0 mark bad and skip
- * data_am_error 0 mark bad and skip
- * data_crc_error % 1024 mark bad and skip
- * no_data_error 0 retry on write
- * mark bad and skip on read
- * overrun_error [ 0..all-1 ] mark bad and skip
- * no_error all continue
- */
-static void determine_progress(buffer_struct * buff, error_cause cause, int mode)
-{
- TRACE_FUN(8, "determine_progress");
- unsigned nr_not_xferred;
- unsigned nr_xferred;
- unsigned dma_residue;
-
- /* Using less preferred order of disable_dma and get_dma_residue
- * because this seems to fail on at least one system if reversed!
- */
- dma_residue = get_dma_residue(fdc.dma);
- disable_dma(fdc.dma);
- nr_xferred = buff->sector_count * SECTOR_SIZE - dma_residue;
- if (cause == no_error && dma_residue == 0) {
- nr_not_xferred = 0;
- } else {
- if (cause == no_error) {
- TRACEx1(4, "unexpected DMA residue: 0x%04x", dma_residue);
- } else {
- TRACEx1(6, "DMA residue = 0x%04x", dma_residue);
- }
- nr_not_xferred = ((dma_residue + (SECTOR_SIZE - 1)) / SECTOR_SIZE);
- buff->sector_count -= nr_not_xferred; /* adjust to actual value */
- }
- /* Update var's influenced by the DMA operation.
- */
- if (buff->sector_count > 0) {
- buff->sector_offset += buff->sector_count;
- buff->data_offset += buff->sector_count;
- buff->ptr += buff->sector_count * SECTOR_SIZE;
- buff->remaining -= buff->sector_count;
- buff->bad_sector_map >>= buff->sector_count;
- }
- if (cause == no_error) {
- TRACEx1(5, "%d Sector(s) transferred", buff->sector_count);
- } else if (cause == no_data_error) {
- TRACEx1(5, "Sector %d not found", SECTOR(buff->sector_offset));
- } else if (nr_xferred > 0 || cause == id_crc_error ||
- cause == id_am_error || cause == data_am_error) {
- TRACEx1(5, "Error in sector %d", SECTOR(buff->sector_offset));
- } else if (cause == overrun_error) {
- /* got an overrun error on the first byte, must be a hardware problem
- */
- TRACE(-1, "Unexpected error: failing DMA controller ?");
- } else {
- TRACEx1(4, "Unexpected error at sector %d", SECTOR(buff->sector_offset));
- }
- /* Sector_offset points to the problem area, except if we got
- * a data_crc_error. In that case it points one past the failing
- * sector.
- * Now adjust sector_offset so it always points one past he
- * failing sector. I.e. skip the bad sector.
- */
- if (cause != no_error) {
- if (cause != data_crc_error) {
- skip_bad_sector(buff);
- }
- update_error_maps(buff, buff->sector_offset - 1);
- }
- TRACE_EXIT;
-}
-
-static int calc_steps(int cmd)
-{
- if (current_cylinder > cmd) {
- return current_cylinder - cmd;
- } else {
- return current_cylinder + cmd;
- }
-}
-
-static void pause_tape(unsigned segment, int retry, int fdc_mode)
-{
- TRACE_FUN(8, "pause_tape");
- int result;
- /* The 3rd initializer needs to be explicit or else gcc will
- * generate a reference to memset :-(
- */
- byte out[3] =
- {FDC_SEEK, FTAPE_UNIT, 0};
-
- /* We'll use a raw seek command to get the tape to rewind
- * and stop for a retry.
- */
- ++history.rewinds;
- if (qic117_cmds[current_command].non_intr) {
- TRACE(2, "motion command may be issued too soon");
- }
- if (retry && (fdc_mode == fdc_reading_data || fdc_mode == fdc_reading_id)) {
- current_command = QIC_MICRO_STEP_PAUSE;
- might_be_off_track = 1;
- } else {
- current_command = QIC_PAUSE;
- }
- out[2] = calc_steps(current_command);
- result = fdc_command(out, 3); /* issue QIC_117 command */
- if (result < 0) {
- TRACEx1(4, "qic-pause failed, status = %d", result);
- } else {
- location.known = 0;
- runner_status = idle;
- hide_interrupt = 1;
- tape_running = 0;
- }
- TRACE_EXIT;
-}
-
-static void stop_tape(unsigned segment)
-{
- TRACE_FUN(8, "stop_tape");
- int result;
- byte out[3] =
- {FDC_SEEK, FTAPE_UNIT, calc_steps(QIC_STOP_TAPE)};
-
- if (qic117_cmds[current_command].non_intr) {
- TRACE(2, "motion command may be issued too soon");
- }
- current_command = QIC_STOP_TAPE;
- /* We'll use a raw seek command to get the tape to stop
- */
- result = fdc_command(out, 3); /* issue QIC_117 command */
- if (result < 0) {
- TRACEx1(4, "qic-stop failed, status = %d", result);
- } else {
- runner_status = idle;
- hide_interrupt = 1;
- tape_running = 0;
- }
- TRACE_EXIT;
-}
-
-static void continue_xfer(buffer_struct ** p_buff, error_cause cause,
- int fdc_mode, unsigned skip)
-{
- TRACE_FUN(8, "continue_xfer");
- buffer_struct *buff = *p_buff;
- int write = (fdc_mode == fdc_writing_data);
- byte fdc_op = (write) ? FDC_WRITE : FDC_READ;
-
- if (skip > 0) {
- /* This part can be removed if it never happens
- */
- if (runner_status != running ||
- (buff->status != (write ? writing : reading))) {
- TRACEx2(1, "unexpected runner/buffer state %d/%d",
- runner_status, buff->status);
- buff->status = error;
- *p_buff = next_buffer(&head); /* finish this buffer */
- runner_status = aborting;
- fdc_mode = fdc_idle;
- }
- }
- if (buff->remaining > 0 && calc_next_cluster(&buffer[head]) > 0) {
- /* still sectors left in current segment, continue with this segment
- */
- if (setup_fdc_and_dma(&buffer[head], fdc_op) < 0) {
- /* failed, abort operation
- */
- buff->bytes = buff->ptr - buff->address;
- buff->status = error;
- buff = *p_buff = next_buffer(&head); /* finish this buffer */
- runner_status = aborting;
- fdc_mode = fdc_idle;
- }
- } else {
- /* current segment completed
- */
- unsigned last_segment = buff->segment_id;
- int eot = ((last_segment + 1) % segments_per_track) == 0;
- int next = buff->next_segment; /* 0 means stop ! */
-
- buff->bytes = buff->ptr - buff->address;
- buff->status = done;
- buff = *p_buff = next_buffer(&head);
- if (eot) {
- /* finished last segment on current track, can't continue
- */
- runner_status = logical_eot;
- fdc_mode = fdc_idle;
- } else if (next > 0) {
- /* continue with next segment
- */
- if (buff->status == waiting) {
- if (write && next != buff->segment_id) {
- TRACE(5, "segments out of order, aborting write");
- runner_status = do_abort;
- fdc_mode = fdc_idle;
- } else {
- setup_new_segment(&buffer[head], next, 0);
- if (stop_read_ahead) {
- buff->next_segment = 0;
- stop_read_ahead = 0;
- }
- if (calc_next_cluster(&buffer[head]) == 0 ||
- setup_fdc_and_dma(&buffer[head], fdc_op) != 0) {
- TRACEx1(1, "couldn't start %s-ahead", (write) ? "write" : "read");
- runner_status = do_abort;
- fdc_mode = fdc_idle;
- } else {
- buff->status = (write) ? writing : reading; /* keep on going */
- }
- }
- } else {
- TRACEx1(5, "all input buffers %s, pausing tape",
- (write) ? "empty" : "full");
- pause_tape(last_segment, 0, fdc_mode);
- runner_status = idle; /* not quite true until next irq */
- }
- } else {
- /* don't continue with next segment
- */
- TRACEx1(5, "no %s allowed, stopping tape",
- (write) ? "write next" : "read ahead");
- if (random_rw) {
- stop_tape(last_segment);
- } else {
- pause_tape(last_segment, 0, fdc_mode);
- }
- runner_status = idle; /* not quite true until next irq */
- }
- }
- TRACE_EXIT;
- return;
-}
-
-static void
-retry_sector(buffer_struct ** p_buff, error_cause cause, int fdc_mode,
- unsigned skip)
-{
- TRACE_FUN(8, "retry_sector");
- buffer_struct *buff = *p_buff;
-
- TRACEx1(4, "%s error, will retry",
- (fdc_mode == fdc_writing_data) ? "write" : "read");
- pause_tape(buff->segment_id, 1, fdc_mode);
- runner_status = aborting;
- buff->status = error;
- buff->skip = skip;
- TRACE_EXIT;
-}
-
-static unsigned
-find_resume_point(buffer_struct * buff)
-{
- TRACE_FUN(8, "find_resume_point");
- int i = 0;
- unsigned long mask;
- unsigned long map;
-
- /* This function is to be called after all variables have been
- * updated to point past the failing sector.
- * If there are any soft errors before the failing sector,
- * find the first soft error and return the sector offset.
- * Otherwise find the last hard error.
- * Note: there should always be at least one hard or soft error !
- */
- if (buff->sector_offset < 1 || buff->sector_offset > 32) {
- TRACEx1(1, "bug: sector_offset = %d", buff->sector_offset);
- } else {
- if (buff->sector_offset >= 32) { /* C-limitation on shift ! */
- mask = 0xffffffff;
- } else {
- mask = (1 << buff->sector_offset) - 1;
- }
- map = buff->soft_error_map & mask;
- if (map) {
- while ((map & (1 << i)) == 0) {
- ++i;
- }
- TRACEx1(4, "at sector %d", SECTOR(i));
- } else {
- map = buff->hard_error_map & mask;
- i = buff->sector_offset - 1;
- if (map) {
- while ((map & (1 << i)) == 0) {
- --i;
- }
- TRACEx1(4, "after sector %d", SECTOR(i));
- ++i; /* first sector after last hard error */
- } else {
- TRACE(1, "bug: no soft or hard errors");
- }
- }
- }
- TRACE_EXIT;
- return i;
-}
-
-/* FDC interrupt service routine.
- */
-void
-fdc_isr(void)
-{
- TRACE_FUN(8, "fdc_isr");
- int result;
- int status;
- error_cause cause = no_error;
- byte in[7];
- static int isr_active = 0;
- int t0;
- buffer_struct *buff = &buffer[head];
- int skip;
-
- t0 = timestamp();
- if (isr_active) {
- TRACE(-1, "nested interrupt, not good !");
- *fdc.hook = fdc_isr; /* hook our handler into the fdc code again */
- TRACE_EXIT;
- return;
- }
- ++isr_active;
- sti(); /* enables interrupts again */
- status = inb_p(fdc.msr);
- if (status & FDC_BUSY) { /* Entering Result Phase */
- hide_interrupt = 0;
- result = fdc_result(in, 7); /* better get it fast ! */
- if (result < 0) {
- /* Entered unknown state...
- */
- TRACE(1, "probably fatal error during FDC Result Phase");
- TRACE(1, "drive may hang until (power) reset :-(");
- /* what to do next ????
- */
- } else {
- int i;
- char *fdc_mode_txt;
-
- decode_irq_cause(fdc_mode, in, &fdc_mode_txt, &cause);
- for (i = 0; i < NR_BUFFERS; ++i) {
- TRACEx3(8, "buffer[%d] status: %d, segment_id: %d",
- i, buffer[i].status, buffer[i].segment_id);
- }
- switch (fdc_mode) {
-
- case fdc_reading_data:{
-
- if (cause == no_error) {
- TRACEi(5, "reading segment", buff->segment_id);
- } else {
- TRACEi(4, "error reading segment", buff->segment_id);
- }
- if (runner_status == aborting || runner_status == do_abort) {
- TRACEx1(4, "aborting %s", fdc_mode_txt);
- break;
- }
- if (buff->retry > 0) {
- TRACEx1(5, "this is retry nr %d", buff->retry);
- }
- if (buff->bad_sector_map == FAKE_SEGMENT) {
- /* This condition occurs when reading a `fake' sector that's
- * not accessible. Doesn't really matter as we would have
- * ignored it anyway !
- * Chance is that we're past the next segment now, so the
- * next operation may fail and result in a retry.
- */
- TRACE(4, "skipping empty segment (read)");
- buff->remaining = 0; /* skip failing sector */
- continue_xfer(&buff, no_error, fdc_mode, 1); /* fake success */
- } else {
- switch (cause) {
- case no_error:{
- determine_progress(buff, cause, fdc_reading_data);
- if (in[2] & 0x40) {
- /* Handle deleted data in header segments.
- * Skip segment and force read-ahead.
- */
- TRACEx1(2, "deleted data in sector %d",
- SECTOR(buff->sector_offset - 1));
- buff->deleted = 1;
- buff->remaining = 0; /* abort transfer */
- buff->soft_error_map |= (-1L << buff->sector_offset);
- if (buff->segment_id == 0) {
- stop_read_ahead = 1; /* stop on next segment */
- }
- buff->next_segment = buff->segment_id + 1; /* force read-ahead */
- skip = (SECTORS_PER_SEGMENT - buff->sector_offset);
- } else {
- skip = 0;
- }
- continue_xfer(&buff, cause, fdc_mode, skip);
- break;
- }
- case no_data_error:
- /* Tape started too far ahead of or behind the right sector.
- * This may also happen in the middle of a segment !
- * Handle no-data as soft error. If next sector fails too,
- * a retry (with needed reposition) will follow.
- */
- case id_am_error:
- case id_crc_error:
- case data_am_error:
- case data_crc_error:
- case overrun_error:{
- int first_error = (buff->soft_error_map == 0 &&
- buff->hard_error_map == 0);
-
- update_history(cause);
- determine_progress(buff, cause, fdc_reading_data);
- if (first_error) {
- skip = buff->sector_offset;
- } else {
- skip = find_resume_point(buff);
- }
- /* Try to resume with next sector on single errors (let ecc
- * correct it), but retry on no_data (we'll be past the
- * target when we get here so we cannot retry) or on multiple
- * errors (reduce chance on ecc failure).
- */
- if (first_error && cause != no_data_error) {
- continue_xfer(&buff, cause, fdc_mode, skip);
- } else {
- retry_sector(&buff, cause, fdc_mode, skip);
- }
- break;
- }
- default:{
- /* Don't know why this could happen but find out.
- */
- TRACE(1, "unexpected error");
- determine_progress(buff, cause, fdc_reading_data);
- retry_sector(&buff, cause, fdc_mode, 0);
- break;
- }
- }
- }
- break;
- }
-
- case fdc_reading_id:{
-
- if (cause == no_error) {
- fdc_cyl = in[3];
- fdc_head = in[4];
- fdc_sect = in[5];
- TRACEx3(6, "id read: C: 0x%02x, H: 0x%02x, R: 0x%02x",
- fdc_cyl, fdc_head, fdc_sect);
- } else { /* no valid information, use invalid sector */
- fdc_cyl =
- fdc_head =
- fdc_sect = 0;
- TRACE(5, "Didn't find valid sector Id");
- }
- fdc_mode = fdc_idle;
- break;
- }
-
- case fdc_writing_data:{
-
- if (cause == no_error) {
- TRACEi(5, "writing segment", buff->segment_id);
- } else {
- TRACEi(4, "error writing segment", buff->segment_id);
- }
- if (runner_status == aborting || runner_status == do_abort) {
- TRACEx1(5, "aborting %s", fdc_mode_txt);
- break;
- }
- if (buff->retry > 0) {
- TRACEx1(5, "this is retry nr %d", buff->retry);
- }
- if (buff->bad_sector_map == FAKE_SEGMENT) {
- /* This condition occurs when trying to write to a `fake'
- * sector that's not accessible. Doesn't really matter as
- * it isn't used anyway ! Might be located at wrong segment,
- * then we'll fail on the next segment.
- */
- TRACE(4, "skipping empty segment (write)");
- buff->remaining = 0; /* skip failing sector */
- continue_xfer(&buff, no_error, fdc_mode, 1); /* fake success */
- } else {
- switch (cause) {
- case no_error:{
- determine_progress(buff, cause, fdc_writing_data);
- continue_xfer(&buff, cause, fdc_mode, 0);
- break;
- }
- case no_data_error:
- case id_am_error:
- case id_crc_error:
- case data_am_error:
- case overrun_error:{
- update_history(cause);
- determine_progress(buff, cause, fdc_writing_data);
- skip = find_resume_point(buff);
- retry_sector(&buff, cause, fdc_mode, skip);
- break;
- }
- default:{
- if (in[1] & 0x02) {
- TRACE(1, "media not writable");
- } else {
- TRACE(-1, "unforeseen write error");
- }
- fdc_mode = fdc_idle;
- break;
- }
- }
- }
- break;
- }
- default:
-
- TRACEx1(1, "Warning: unexpected irq during: %s",
- fdc_mode_txt);
- fdc_mode = fdc_idle;
- break;
- }
- }
- if (runner_status == do_abort) {
- /* cease operation, remember tape position
- */
- TRACE(5, "runner aborting");
- runner_status = aborting;
- ++expected_stray_interrupts;
- }
- } else { /* !FDC_BUSY */
- /* clear interrupt, cause should be gotten by issuing
- * a Sense Interrupt Status command.
- */
- if (fdc_mode == fdc_recalibrating || fdc_mode == fdc_seeking) {
- if (hide_interrupt) {
- int st0;
- int pcn;
-
- result = fdc_sense_interrupt_status(&st0, &pcn);
- current_cylinder = pcn;
- TRACE(5, "handled hidden interrupt");
- }
- seek_completed = 1;
- fdc_mode = fdc_idle;
- } else if (!waitqueue_active(&wait_intr)) {
- if (expected_stray_interrupts == 0) {
- TRACE(2, "unexpected stray interrupt");
- } else {
- TRACE(5, "expected stray interrupt");
- --expected_stray_interrupts;
- }
- } else {
- if (fdc_mode == fdc_reading_data || fdc_mode == fdc_writing_data ||
- fdc_mode == fdc_reading_id) {
- byte status = inb_p(fdc.msr);
- if (status & FDC_BUSY) {
- TRACE(-1, "***** FDC failure, busy too late");
- } else {
- TRACE(-1, "***** FDC failure, no busy");
- }
- } else {
- TRACE(6, "awaited stray interrupt");
- }
- }
- hide_interrupt = 0;
- }
- /* Handle sleep code.
- */
- if (!hide_interrupt) {
- ++interrupt_seen;
- if (wait_intr) {
- wake_up_interruptible(&wait_intr);
- }
- } else {
- TRACEx1(5, "hiding interrupt while %s", wait_intr ? "waiting" : "active");
- }
- t0 = timediff(t0, timestamp());
- if (t0 >= 1000) { /* only tell us about long calls */
- TRACEx1(7, "isr() duration: %5d usec", t0);
- }
- *fdc.hook = fdc_isr; /* hook our handler into the fdc code again */
- TRACE_EXIT;
- --isr_active;
-}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov