[PATCH] Linux-0.95a (March 17, 1992)

Oops.  I had forgotten to change the kernel version number in 0.95 (so
it showed as 0.12).

 - 80x50 console on standard VGA
 - do "memcpy_fromfs()" and "memcpy_tofs()" rather than byte-at-a-time
   to improve performance (inspired by some earlier patches by Keith White)
 - allow select() on many more file descriptors
 - support up to 4 serial ports (and increase buffering size)
 - Branko Lankester helped make extended partitions work and implemented
   DM partition table support

The big deal in the release notes is actually that the root diskette
maintainership had been moved over to Jim Winstead Jr.

Makefile

@@ -61,28 +61,28 @@ tools/system:	boot/head.o init/main.o \
 	$(LIBS) \
 	-o tools/system > System.map
 
-kernel/math/math.a:
+kernel/math/math.a: dummy
 	(cd kernel/math; make)
 
-kernel/blk_drv/blk_drv.a:
+kernel/blk_drv/blk_drv.a: dummy
 	(cd kernel/blk_drv; make)
 
-kernel/chr_drv/chr_drv.a:
+kernel/chr_drv/chr_drv.a: dummy
 	(cd kernel/chr_drv; make)
 
-kernel/kernel.o:
+kernel/kernel.o: dummy
 	(cd kernel; make)
 
-mm/mm.o:
+mm/mm.o: dummy
 	(cd mm; make)
 
-fs/fs.o:
+fs/fs.o: dummy
 	(cd fs; make)
 
-fs/minix/minix.o:
+fs/minix/minix.o: dummy
 	(cd fs/minix; make)
 
-lib/lib.a:
+lib/lib.a: dummy
 	(cd lib; make)
 
 boot/setup: boot/setup.s
@@ -120,6 +120,8 @@ dep:
 	(cd kernel; make dep)
 	(cd mm; make dep)
 
+dummy:
+
 ### Dependencies:
 init/main.o : init/main.c include/unistd.h include/sys/stat.h \
   include/sys/types.h include/sys/time.h include/time.h include/sys/times.h \

boot/setup.S

@@ -43,6 +43,12 @@ start:
 	int	0x15
 	mov	[2],ax
 
+! set the keyboard repeat rate to the max
+
+	mov	ax,#0x0305
+	mov	bx,#0x0000
+	int	0x16
+
 ! check for EGA/VGA and some config parameters
 
 	mov	ah,#0x12
@@ -498,8 +504,25 @@ nozero:	sub	al,#0x80
 	lodsw
 	pop	ds
 	ret
-novid7:	pop	ds	! Here could be code to support standard 80x50,80x30
-	mov	ax,#0x5019	
+novid7:
+	mov	ax,#0x1112
+	mov	bl,#0
+	int	0x10		! use 8x8 font set (50 lines on VGA)
+
+	mov	ax,#0x1200
+	mov	bl,#0x20
+	int	0x10		! use alternate print screen
+
+	mov	ax,#0x1201
+	mov	bl,#0x34
+	int	0x10		! turn off cursor emulation
+
+	mov	ah,#0x01
+	mov	cx,#0x0607
+	int	0x10		! turn on cursor (scan lines 6 to 7)
+
+	pop	ds
+	mov	ax,#0x5032	! return 80x50
 	ret
 
 ! Routine that 'tabs' to next col.

fs/block_dev.c

@@ -47,8 +47,9 @@ int block_write(struct inode * inode, struct file * filp, char * buf, int count)
 		filp->f_pos += chars;
 		written += chars;
 		count -= chars;
-		while (chars-->0)
-			*(p++) = get_fs_byte(buf++);
+		memcpy_fromfs(p,buf,chars);
+		p += chars;
+		buf += chars;
 		bh->b_dirt = 1;
 		brelse(bh);
 	}
@@ -85,8 +86,9 @@ int block_read(struct inode * inode, struct file * filp, char * buf, int count)
 		filp->f_pos += chars;
 		read += chars;
 		count -= chars;
-		while (chars-->0)
-			put_fs_byte(*(p++),buf++);
+		memcpy_tofs(buf,p,chars);
+		p += chars;
+		buf += chars;
 		brelse(bh);
 	}
 	return read;

fs/buffer.c

@@ -109,10 +109,15 @@ void inline invalidate_buffers(int dev)
 void check_disk_change(int dev)
 {
 	int i;
+	struct buffer_head * bh;
 
 	if (MAJOR(dev) != 2)
 		return;
-	if (!floppy_change(dev & 0x03))
+	if (!(bh = getblk(dev,0)))
+		return;
+	i = floppy_change(bh);
+	brelse(bh);
+	if (!i)
 		return;
 	for (i=0 ; i<NR_SUPER ; i++)
 		if (super_block[i].s_dev == dev)

fs/fasterdisk.pat

+From kwhite@csi.uottawa.ca Sun Mar 15 20:01:06 1992
+Received: from klaava.Helsinki.FI by kruuna.helsinki.fi with SMTP id AA04345
+  (5.65c/IDA-1.4.4 for <torvalds@klaava.Helsinki.FI>); Sun, 15 Mar 1992 20:00:45 +0200
+Received: from csi.UOttawa.CA (csi0.csi.uottawa.ca) by klaava.Helsinki.FI (4.1/SMI-4.1)
+	id AA21712; Sun, 15 Mar 92 20:00:40 +0200
+Received: by csi.UOttawa.CA id AA00608
+  (5.65+/IDA-1.3.5 for torvalds@klaava.helsinki.fi); Sun, 15 Mar 92 12:57:47 -0500
+From: Keith White <kwhite@csi.uottawa.ca>
+Message-Id: <9203151757.AA00608@csi.UOttawa.CA>
+Subject: reset-floppy fixed, double your disk speed (linux 0.95)
+To: torvalds@cc.helsinki.fi (Linus Torvalds)
+Date: Sun, 15 Mar 92 12:57:46 EST
+X-Mailer: ELM [version 2.3 PL11]
+Status: OR
+
+A couple of things.
+
+1) I must be one of those lucky few who's been able to use linux0.95.
+However I was surprised to see that hard disk speed was slower.  This
+was until I remembered that I had patched fs/block_dev.c and
+include/asm/segment.h to support block moves to and from the fs
+segment.  These patches (very minimal it must be admitted) give a
+reasonable increase in speed for 'fsck':
+	original:	42.62 elapsed
+	patched:	22.06 elapsed
+These patches have no effect on sequential disk access (dd if=/dev/hda
+...)  since most time is spent waiting for those small 2 sector
+transfers anyway.  The patches are included below.
+
+2) I don't run DOS so a floppy disk format program is sort of
+essential.  Lawrence Foard's (sp?) formatting routines have a few
+problems (nits).
+	a) The inter-sector gap should be larger for a format than it
+is for a read or write.
+	b) An interleave is not required (at least on my machine, a
+bottom of the line 386SX-16).
+
+3) I seem to have fixed the dreaded "reset-floppy called" problem --
+at least it works for me.  The posted fix does not work in my case.
+I'd send you these patches as well, but I only have diffs that include
+all the mods I did for the floppy format stuff.  The key point (I
+think) was to only reset twice during an error loop.  If a track was
+bad, the recalibrate would fail and call reset which would call
+recalibrate ...  If you're interested, I could try to separate the
+formatting stuff and all my debugging "printks" from the reset fix
+stuff and send the diffs.
+
+...keith (kwhite@csi.uottawa.ca)
+
+---cut here---
+*** 1.1	1992/03/14 16:33:21
+--- include/asm/segment.h	1992/03/15 17:10:14
+***************
+*** 63,65 ****
+--- 63,109 ----
+  	__asm__("mov %0,%%fs"::"r" ((unsigned short) val));
+  }
+  
++ /*
++  * these routines are added to use the movs instruction with data
++  * in the fs segment.  No optimizations are done with regards to using
++  * movsw or movsd 
++  *
++  * kwhite@csi.uottawa.ca
++  */
++ 
++ #define memcpy_fromfs(dest,src,n) __asm__ (\
++ 	"mov %%fs,%%ax; movl %%ax,%%ds\n\
++ 	cld; rep; movsb\n\
++ 	mov %%es,%%ax; mov %%ax,%%ds" \
++ 	::"D" ((long)(dest)), "S" ((long)(src)), "c" ((long) (n)) \
++ 	:"di", "si", "cx", "ax");
++ #define memcpy_fromfs_w(dest,src,n) __asm__ (\
++ 	"mov %%fs,%%ax; movl %%ax,%%ds\n\
++ 	cld; rep; movsw\n\
++ 	mov %%es,%%ax; mov %%ax,%%ds" \
++ 	::"D" ((long)(dest)), "S" ((long)(src)), "c" ((long) (n)) \
++ 	:"di", "si", "cx", "ax");
++ #define memcpy_fromfs_l(dest,src,n) __asm__ (\
++ 	"mov %%fs,%%ax; movl %%ax,%%ds\n\
++ 	cld; rep; movsl\n\
++ 	mov %%es,%%ax; mov %%ax,%%ds" \
++ 	::"D" ((long)(dest)), "S" ((long)(src)), "c" ((long) (n)) \
++ 	:"di", "si", "cx", "ax");
++ #define memcpy_tofs(dest,src,n) __asm__ (\
++ 	"mov %%fs,%%ax; mov %%ax,%%es\n\
++ 	cld; rep; movsb\n\
++ 	mov %%ds,%%ax; mov %%ax,%%es" \
++ 	::"D" ((long)(dest)), "S" ((long)(src)), "c" ((long) (n)) \
++ 	:"di", "si", "cx", "ax");
++ #define memcpy_tofs_w(dest,src,n) __asm__ (\
++ 	"mov %%fs,%%ax; mov %%ax,%%es\n\
++ 	cld; rep; movsw\n\
++ 	mov %%ds,%%ax; mov %%ax,%%es" \
++ 	::"D" ((long)(dest)), "S" ((long)(src)), "c" ((long) (n)) \
++ 	:"di", "si", "cx", "ax");
++ #define memcpy_tofs_l(dest,src,n) __asm__ (\
++ 	"mov %%fs,%%ax; mov %%ax,%%es\n\
++ 	cld; rep; movsl\n\
++ 	mov %%ds,%%ax; mov %%ax,%%es"\
++ 	::"D" ((long)(dest)), "S" ((long)(src)), "c" ((long) (n)) \
++ 	:"di", "si", "cx", "ax");
+*** 1.1	1992/03/14 16:37:10
+--- fs/block_dev.c	1992/03/14 16:38:26
+***************
+*** 47,54 ****
+--- 47,64 ----
+  		filp->f_pos += chars;
+  		written += chars;
+  		count -= chars;
++ #ifdef notdef
+  		while (chars-->0)
+  			*(p++) = get_fs_byte(buf++);
++ #else
++ 		if ((chars&1) || ((long)p&1) || ((long)buf&1)) {
++ 			memcpy_fromfs(p, buf, chars);
++ 		}
++ 		else {
++ 			memcpy_fromfs_w(p, buf, chars>>1);
++ 		}
++ 		p += chars; buf += chars; chars = 0;
++ #endif
+  		bh->b_dirt = 1;
+  		brelse(bh);
+  	}
+***************
+*** 85,92 ****
+--- 95,112 ----
+  		filp->f_pos += chars;
+  		read += chars;
+  		count -= chars;
++ #ifdef notdef
+  		while (chars-->0)
+  			put_fs_byte(*(p++),buf++);
++ #else
++ 		if ((chars&1) || ((long)buf&1) || ((long)p&1)) {
++ 			memcpy_tofs(buf, p, chars);
++ 		}
++ 		else {
++ 			memcpy_tofs_w(buf, p, chars>>1);
++ 		}
++ 		p += chars; buf += chars; chars = 0;
++ #endif
+  		brelse(bh);
+  	}
+  	return read;
+---cut here---
+
+-- 
+BITNET:		kwhite@uotcsi2.bitnet (being phased out)
+UUCP:		{...,nrcaer,cunews}!uotcsi2!kwhite
+INTERNET:	kwhite@csi.uottawa.ca
+

fs/inode.c

@@ -73,8 +73,10 @@ void invalidate_inodes(int dev)
 	for(i=0 ; i<NR_INODE ; i++,inode++) {
 		wait_on_inode(inode);
 		if (inode->i_dev == dev) {
-			if (inode->i_count)
+			if (inode->i_count) {
 				printk("inode in use on removed disk\n\r");
+				continue;
+			}
 			inode->i_dev = inode->i_dirt = 0;
 		}
 	}

fs/minix/file_dev.c

@@ -39,9 +39,8 @@ int minix_file_read(struct inode * inode, struct file * filp, char * buf, int co
 		left -= chars;
 		read += chars;
 		if (bh) {
-			char * p = nr + bh->b_data;
-			while (chars-->0)
-				put_fs_byte(*(p++),buf++);
+			memcpy_tofs(buf,nr+bh->b_data,chars);
+			buf += chars;
 			brelse(bh);
 		} else {
 			while (chars-->0)
@@ -81,7 +80,6 @@ int minix_file_write(struct inode * inode, struct file * filp, char * buf, int c
 		}
 		c = pos % BLOCK_SIZE;
 		p = c + bh->b_data;
-		bh->b_dirt = 1;
 		c = BLOCK_SIZE-c;
 		if (c > count-written)
 			c = count-written;
@@ -91,8 +89,9 @@ int minix_file_write(struct inode * inode, struct file * filp, char * buf, int c
 			inode->i_dirt = 1;
 		}
 		written += c;
-		while (c-->0)
-			*(p++) = get_fs_byte(buf++);
+		memcpy_fromfs(p,buf,c);
+		buf += c;
+		bh->b_dirt = 1;
 		brelse(bh);
 	}
 	inode->i_mtime = CURRENT_TIME;

fs/minix/truncate.c

@@ -135,6 +135,8 @@ static int check_char_dev(struct inode * inode, struct file * filp)
 			tty->session= current->session;
 			tty->pgrp = current->pgrp;
 		}
+		if (IS_A_SERIAL(min))
+			serial_open(min-64);
 	}
 	return 0;
 }

fs/select.c

@@ -39,11 +39,15 @@ typedef struct {
 	struct task_struct ** wait_address;
 } wait_entry;
 
-typedef struct {
-	int nr;
+typedef struct select_table_struct {
+	int nr, woken;
+	struct task_struct * current;
+	struct select_table_struct * next_table;
 	wait_entry entry[NR_OPEN*3];
 } select_table;
 
+static select_table * sel_tables = NULL;
+
 static void add_wait(struct task_struct ** wait_address, select_table * p)
 {
 	int i;
@@ -53,32 +57,52 @@ static void add_wait(struct task_struct ** wait_address, select_table * p)
 	for (i = 0 ; i < p->nr ; i++)
 		if (p->entry[i].wait_address == wait_address)
 			return;
+	current->next_wait = NULL;
 	p->entry[p->nr].wait_address = wait_address;
-	p->entry[p->nr].old_task = * wait_address;
+	p->entry[p->nr].old_task = *wait_address;
 	*wait_address = current;
 	p->nr++;
 }
 
-static void free_wait(select_table * p)
+/*
+ * free_wait removes the current task from any wait-queues and then
+ * wakes up the queues.
+ */
+static void free_one_table(select_table * p)
 {
 	int i;
 	struct task_struct ** tpp;
 
+	for(tpp = &LAST_TASK ; tpp > &FIRST_TASK ; --tpp)
+		if (*tpp && ((*tpp)->next_wait == p->current))
+			(*tpp)->next_wait = NULL;
+	if (!p->nr)
+		return;
 	for (i = 0; i < p->nr ; i++) {
-		tpp = p->entry[i].wait_address;
-		while (*tpp && *tpp != current) {
-			(*tpp)->state = 0;
-			current->state = TASK_UNINTERRUPTIBLE;
-			schedule();
-		}
-		if (!*tpp)
-			printk("free_wait: NULL");
-		if (*tpp = p->entry[i].old_task)
-			(**tpp).state = 0;
+		wake_up(p->entry[i].wait_address);
+		wake_up(&p->entry[i].old_task);
 	}
 	p->nr = 0;
 }
 
+static void free_wait(select_table * p)
+{
+	select_table * tmp;
+
+	if (p->woken)
+		return;
+	p = sel_tables;
+	sel_tables = NULL;
+	while (p) {
+		wake_up(&p->current);
+		p->woken = 1;
+		tmp = p->next_table;
+		p->next_table = NULL;
+		free_one_table(p);
+		p = tmp;
+	}
+}
+
 static struct tty_struct * get_tty(struct inode * inode)
 {
 	int major, minor;
@@ -177,6 +201,10 @@ int do_select(fd_set in, fd_set out, fd_set ex,
 	}
 repeat:
 	wait_table.nr = 0;
+	wait_table.woken = 0;
+	wait_table.current = current;
+	wait_table.next_table = sel_tables;
+	sel_tables = &wait_table;
 	*inp = *outp = *exp = 0;
 	count = 0;
 	mask = 1;
@@ -200,7 +228,9 @@ int do_select(fd_set in, fd_set out, fd_set ex,
 	if (!(current->signal & ~current->blocked) &&
 	    current->timeout && !count) {
 		current->state = TASK_INTERRUPTIBLE;
+		sti();
 		schedule();
+		cli();
 		free_wait(&wait_table);
 		goto repeat;
 	}
@@ -276,7 +306,9 @@ int sys_select( unsigned long *buffer )
 		timeout *= (1000000/HZ);
 		put_fs_long(timeout, (unsigned long *) &tvp->tv_usec);
 	}
-	if (!i && (current->signal & ~current->blocked))
-		return -EINTR;
+	if (i)
 		return i;
+	if (current->signal & ~current->blocked)
+		return -EINTR;
+	return 0;
 }

include/asm/io.h

 static void inline outb(char value, unsigned short port)
 {
-__asm__ volatile ("outb %0,%1"::"a" (value),"d" (port));
+__asm__ volatile ("outb %0,%1"
+		::"a" ((char) value),"d" ((unsigned short) port));
 }
 
 static void inline outb_p(char value, unsigned short port)
 {
-__asm__ volatile ("outb %0,%1\n\tjmp 1f\n1:\tjmp 1f\n1:"
-	::"a" (value),"d" (port));
+__asm__ volatile ("outb %0,%1\n"
+		  "\tjmp 1f\n"
+		"1:\tjmp 1f\n"
+		"1:\tjmp 1f\n"
+		"1:\tjmp 1f\n"
+		"1:"
+		::"a" ((char) value),"d" ((unsigned short) port));
 }
 
 static unsigned char inline inb(unsigned short port)
 {
 	unsigned char _v;
-	__asm__ volatile ("inb %1,%0":"=a" (_v):"d" (port));
+__asm__ volatile ("inb %1,%0"
+		:"=a" (_v):"d" ((unsigned short) port));
 	return _v;
 }
 
 static unsigned char inb_p(unsigned short port)
 {
 	unsigned char _v;
-	__asm__ volatile ("inb %1,%0\n"
+__asm__ volatile ("inb %1,%0\n"
 		  "\tjmp 1f\n"
 		"1:\tjmp 1f\n"
-		"1:":"=a" (_v):"d" ((unsigned short) port));
+		"1:\tjmp 1f\n"
+		"1:\tjmp 1f\n"
+		"1:"
+		:"=a" (_v):"d" ((unsigned short) port));
 	return _v;
 }

include/asm/segment.h

@@ -37,6 +37,40 @@ extern inline void put_fs_long(unsigned long val,unsigned long * addr)
 __asm__ ("movl %0,%%fs:%1"::"r" (val),"m" (*addr));
 }
 
+extern inline void memcpy_tofs(void * to, void * from, unsigned long n)
+{
+__asm__("cld\n\t"
+	"push %%es\n\t"
+	"push %%fs\n\t"
+	"pop %%es\n\t"
+	"testb $1,%%cl\n\t"
+	"je 1f\n\t"
+	"movsb\n"
+	"1:\ttestb $2,%%cl\n\t"
+	"je 2f\n\t"
+	"movsw\n"
+	"2:\tshrl $2,%%ecx\n\t"
+	"rep ; movsl\n\t"
+	"pop %%es"
+	::"c" (n),"D" ((long) to),"S" ((long) from)
+	:"cx","di","si");
+}
+
+extern inline void memcpy_fromfs(void * to, void * from, unsigned long n)
+{
+__asm__("cld\n\t"
+	"testb $1,%%cl\n\t"
+	"je 1f\n\t"
+	"fs ; movsb\n"
+	"1:\ttestb $2,%%cl\n\t"
+	"je 2f\n\t"
+	"fs ; movsw\n"
+	"2:\tshrl $2,%%ecx\n\t"
+	"rep ; fs ; movsl"
+	::"c" (n),"D" ((long) to),"S" ((long) from)
+	:"cx","di","si");
+}
+
 /*
  * Someone who knows GNU asm better than I should double check the followig.
  * It seems to work, but I don't know if I'm doing something subtly wrong.

include/linux/config.h

@@ -16,7 +16,7 @@
 #define UTS_SYSNAME "Linux"
 #define UTS_NODENAME "(none)"	/* set by sethostname() */
 #define UTS_RELEASE "0"		/* patchlevel */
-#define UTS_VERSION "0.12"
+#define UTS_VERSION "0.95a"
 #define UTS_MACHINE "i386"	/* hardware type */
 
 /* Don't touch these, unless you really know what your doing. */

include/linux/fs.h

@@ -165,7 +165,7 @@ extern struct buffer_head * start_buffer;
 extern int nr_buffers;
 
 extern void check_disk_change(int dev);
-extern int floppy_change(unsigned int nr);
+extern int floppy_change(struct buffer_head * first_block);
 extern int ticks_to_floppy_on(unsigned int dev);
 extern void floppy_on(unsigned int dev);
 extern void floppy_off(unsigned int dev);

include/linux/sched.h

@@ -121,6 +121,10 @@ struct task_struct {
 	 * p->p_pptr->pid)
 	 */
 	struct task_struct *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
+	/*
+	 * sleep makes a singly linked list with this.
+	 */
+	struct task_struct *next_wait;
 	unsigned short uid,euid,suid;
 	unsigned short gid,egid,sgid;
 	unsigned long timeout,alarm;
@@ -164,7 +168,7 @@ struct task_struct {
 /* ec,brk... */	0,0,0,0,0,0, \
 /* pid etc.. */	0,0,0,0, \
 /* suppl grps*/ {NOGROUP,}, \
-/* proc links*/ &init_task.task,0,0,0, \
+/* proc links*/ &init_task.task,NULL,NULL,NULL,NULL, \
 /* uid etc */	0,0,0,0,0,0, \
 /* timeout */	0,0,0,0,0,0,0, \
 /* rlimits */   { {0x7fffffff, 0x7fffffff}, {0x7fffffff, 0x7fffffff},  \

include/linux/timer.h

@@ -24,11 +24,16 @@
 
 #define BLANK_TIMER	0
 #define BEEP_TIMER	1
+
 #define SER1_TIMER	2
 #define SER2_TIMER	3
+#define SER3_TIMER	4
+#define SER4_TIMER	5
 
 #define SER1_TIMEOUT	8
 #define SER2_TIMEOUT	9
+#define SER3_TIMEOUT	10
+#define SER4_TIMEOUT	11
 
 #define HD_TIMER	16
 #define FLOPPY_TIMER	17

include/linux/tty.h

@@ -10,14 +10,14 @@
 #define _TTY_H
 
 #define MAX_CONSOLES	8
-#define NR_SERIALS	2
+#define NR_SERIALS	4
 #define NR_PTYS		4
 
 extern int NR_CONSOLES;
 
 #include <termios.h>
 
-#define TTY_BUF_SIZE 1024
+#define TTY_BUF_SIZE 2048
 
 struct tty_queue {
 	unsigned long data;
@@ -60,6 +60,7 @@ struct tty_struct {
 	int pgrp;
 	int session;
 	int stopped;
+	int busy;
 	struct winsize winsize;
 	void (*write)(struct tty_struct * tty);
 	struct tty_queue *read_q;
@@ -67,6 +68,18 @@ struct tty_struct {
 	struct tty_queue *secondary;
 	};
 
+#define TTY_WRITE(tty) \
+do { \
+	cli(); \
+	if (!(tty)->busy) { \
+		(tty)->busy = 1; \
+		sti(); \
+		(tty)->write((tty)); \
+		(tty)->busy = 0; \
+	} else \
+		sti(); \
+} while (0)
+
 extern struct tty_struct tty_table[];
 extern int fg_console;
 extern unsigned long video_num_columns;
@@ -96,6 +109,8 @@ void rs_write(struct tty_struct * tty);
 void mpty_write(struct tty_struct * tty);
 void spty_write(struct tty_struct * tty);
 
+extern void serial_open(unsigned int line);
+
 void copy_to_cooked(struct tty_struct * tty);
 
 void update_screen(int new_console);

include/termios.h

@@ -3,8 +3,6 @@
 
 #include <sys/types.h>
 
-#define TTY_BUF_SIZE 1024
-
 /* 0x54 is just a magic number to make these relatively uniqe ('T') */
 
 #define TCGETS		0x5401

init/main.c

@@ -203,6 +203,7 @@ void init(void)
 		NR_BUFFERS*BLOCK_SIZE);
 	printf("Free mem: %d bytes\n\r",memory_end-main_memory_start);
 
+	execve("/etc/init",argv_init,envp_init);
 	execve("/bin/init",argv_init,envp_init);
 	/* if this fails, fall through to original stuff */
 

kernel/blk_drv/blk.h

@@ -100,11 +100,16 @@ extern int * blk_size[NR_BLK_DEV];
 void (*DEVICE_INTR)(void) = NULL;
 #endif
 #ifdef DEVICE_TIMEOUT
-#define SET_INTR(x) (DEVICE_INTR = (x), \
-	timer_table[DEVICE_TIMEOUT].expires = jiffies + 200, \
-	timer_active |= 1<<DEVICE_TIMEOUT)
+
+#define SET_INTR(x) if (DEVICE_INTR = (x)) { \
+timer_table[DEVICE_TIMEOUT].expires = jiffies + 200; \
+timer_active |= 1<<DEVICE_TIMEOUT; \
+} else timer_active &= ~(1<<DEVICE_TIMEOUT)
+
 #else
+
 #define SET_INTR(x) (DEVICE_INTR = (x))
+
 #endif
 static void (DEVICE_REQUEST)(void);
 
@@ -134,23 +139,16 @@ extern inline void end_request(int uptodate)
 	CURRENT = CURRENT->next;
 }
 
-#ifdef DEVICE_TIMEOUT
-#define CLEAR_DEVICE_TIMEOUT timer_active &= ~(1<<DEVICE_TIMEOUT);
-#else
-#define CLEAR_DEVICE_TIMEOUT
-#endif
-
 #ifdef DEVICE_INTR
-#define CLEAR_DEVICE_INTR DEVICE_INTR = 0;
+#define CLEAR_INTR SET_INTR(NULL)
 #else
-#define CLEAR_DEVICE_INTR
+#define CLEAR_INTR
 #endif
 
 #define INIT_REQUEST \
 repeat: \
 	if (!CURRENT) {\
-		CLEAR_DEVICE_INTR \
-		CLEAR_DEVICE_TIMEOUT \
+		CLEAR_INTR; \
 		return; \
 	} \
 	if (MAJOR(CURRENT->dev) != MAJOR_NR) \

kernel/blk_drv/floppy.c

@@ -43,6 +43,8 @@
 #define MAJOR_NR 2
 #include "blk.h"
 
+unsigned int changed_floppies = 0;
+
 static int recalibrate = 0;
 static int reset = 0;
 static int seek = 0;
@@ -56,8 +58,8 @@ __asm__("outb %0,%1\n\tjmp 1f\n1:\tjmp 1f\n1:"::"a" ((char) (val)),"i" (port))
 #define DRIVE(x) ((x)&0x03)
 /*
  * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
- * max X times - some types of errors increase the errorcount by 2,
- * so we might actually retry only X/2 times before giving up.
+ * max X times - some types of errors increase the errorcount by 2 or
+ * even 3, so we might actually retry only X/2 times before giving up.
  */
 #define MAX_ERRORS 12
 
@@ -115,18 +117,20 @@ extern char floppy_track_buffer[512*2*18];
  * information to interrupts. They are the data used for the current
  * request.
  */
+#define NO_TRACK 255
+
 static int read_track = 0;	/* flag to indicate if we want to read all track */
 static int buffer_track = -1;
 static int buffer_drive = -1;
 static int cur_spec1 = -1;
 static int cur_rate = -1;
 static struct floppy_struct * floppy = floppy_type;
-static unsigned char current_drive = 0;
+static unsigned char current_drive = 255;
 static unsigned char sector = 0;
 static unsigned char head = 0;
 static unsigned char track = 0;
 static unsigned char seek_track = 0;
-static unsigned char current_track = 255;
+static unsigned char current_track = NO_TRACK;
 static unsigned char command = 0;
 unsigned char selected = 0;
 struct task_struct * wait_on_floppy_select = NULL;
@@ -145,20 +149,37 @@ void floppy_deselect(unsigned int nr)
  * to the desired drive, but it will probably not survive the sleep if
  * several floppies are used at the same time: thus the loop.
  */
-int floppy_change(unsigned int nr)
+int floppy_change(struct buffer_head * bh)
 {
-repeat:
-	floppy_on(nr);
-	while ((current_DOR & 3) != nr && selected)
-		sleep_on(&wait_on_floppy_select);
-	if ((current_DOR & 3) != nr)
-		goto repeat;
-	if (inb(FD_DIR) & 0x80) {
-		floppy_off(nr);
+	unsigned int mask = 1 << (bh->b_dev & 0x03);
+
+	if (MAJOR(bh->b_dev) != 2) {
+		printk("floppy_changed: not a floppy\n");
+		return 0;
+	}
+	if (changed_floppies & mask) {
+		changed_floppies &= ~mask;
+		recalibrate = 1;
+		return 1;
+	}
+	if (!bh)
+		return 0;
+	if (bh->b_dirt)
+		ll_rw_block(WRITE,bh);
+	else {
 		buffer_track = -1;
+		bh->b_uptodate = 0;
+		ll_rw_block(READ,bh);
+	}
+	cli();
+	while (bh->b_lock)
+		sleep_on(&bh->b_wait);
+	sti();
+	if (changed_floppies & mask) {
+		changed_floppies &= ~mask;
+		recalibrate = 1;
 		return 1;
 	}	
-	floppy_off(nr);
 	return 0;
 }
 
@@ -223,6 +244,7 @@ static void output_byte(char byte)
 			return;
 		}
 	}
+	current_track = NO_TRACK;
 	reset = 1;
 	printk("Unable to send byte to FDC\n\r");
 }
@@ -244,13 +266,14 @@ static int result(void)
 		}
 	}
 	reset = 1;
+	current_track = NO_TRACK;
 	printk("Getstatus times out\n\r");
 	return -1;
 }
 
 static void bad_flp_intr(void)
 {
-	current_track = -1;
+	current_track = NO_TRACK;
 	CURRENT->errors++;
 	if (CURRENT->errors > MAX_ERRORS) {
 		floppy_deselect(current_drive);
@@ -258,6 +281,8 @@ static void bad_flp_intr(void)
 	}
 	if (CURRENT->errors > MAX_ERRORS/2)
 		reset = 1;
+	else
+		recalibrate = 1;
 }	
 
 /*
@@ -383,15 +408,15 @@ static void transfer(void)
 static void recal_interrupt(void)
 {
 	output_byte(FD_SENSEI);
+	current_track = NO_TRACK;
 	if (result()!=2 || (ST0 & 0xE0) == 0x60)
 		reset = 1;
-	else
-		recalibrate = 0;
 	do_fd_request();
 }
 
 void unexpected_floppy_interrupt(void)
 {
+	current_track = NO_TRACK;
 	output_byte(FD_SENSEI);
 	if (result()!=2 || (ST0 & 0xE0) == 0x60)
 		reset = 1;
@@ -427,15 +452,16 @@ static void reset_floppy(void)
 {
 	int i;
 
+	do_floppy = reset_interrupt;
 	reset = 0;
+	current_track = NO_TRACK;
 	cur_spec1 = -1;
 	cur_rate = -1;
 	recalibrate = 1;
 	printk("Reset-floppy called\n\r");
 	cli();
-	do_floppy = reset_interrupt;
 	outb_p(current_DOR & ~0x04,FD_DOR);
-	for (i=0 ; i<100 ; i++)
+	for (i=0 ; i<1000 ; i++)
 		__asm__("nop");
 	outb(current_DOR,FD_DOR);
 	sti();
@@ -443,6 +469,18 @@ static void reset_floppy(void)
 
 static void floppy_on_interrupt(void)
 {
+	if (inb(FD_DIR) & 0x80) {
+		changed_floppies |= 1<<current_drive;
+		buffer_track = -1;
+	}
+	if (reset) {
+		reset_floppy();
+		return;
+	}
+	if (recalibrate) {
+		recalibrate_floppy();
+		return;
+	}
 /* We cannot do a floppy-select, as that might sleep. We just force it */
 	selected = 1;
 	if (current_drive != (current_DOR & 3)) {
@@ -459,19 +497,11 @@ void do_fd_request(void)
 	unsigned int block;
 	char * buffer_area;
 
-	seek = 0;
-	if (reset) {
-		reset_floppy();
-		return;
-	}
-	if (recalibrate) {
-		recalibrate_floppy();
-		return;
-	}
 	INIT_REQUEST;
+	seek = 0;
 	floppy = (MINOR(CURRENT->dev)>>2) + floppy_type;
 	if (current_drive != CURRENT_DEV)
-		seek = 1;
+		current_track = NO_TRACK;
 	current_drive = CURRENT_DEV;
 	block = CURRENT->sector;
 	if (block+2 > floppy->size) {

kernel/blk_drv/hd.c

@@ -11,6 +11,9 @@
  * sleep. Special care is recommended.
  * 
  *  modified by Drew Eckhardt to check nr of hd's from the CMOS.
+ *
+ *  Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ *  in the early extended-partition checks and added DM partitions
  */
 
 #include <linux/config.h>
@@ -26,10 +29,11 @@
 #define MAJOR_NR 3
 #include "blk.h"
 
-#define CMOS_READ(addr) ({ \
-outb_p(0x80|addr,0x70); \
-inb_p(0x71); \
-})
+static inline unsigned char CMOS_READ(unsigned char addr)
+{
+	outb_p(0x80|addr,0x70);
+	return inb_p(0x71);
+}
 
 /* Max read/write errors/sector */
 #define MAX_ERRORS	7
@@ -39,7 +43,7 @@ static void recal_intr(void);
 static void bad_rw_intr(void);
 
 static int recalibrate = 0;
-static int reset = 0;
+static int reset = 1;
 
 /*
  *  This struct defines the HD's and their types.
@@ -87,12 +91,30 @@ static void check_partition(unsigned int dev)
 	if (*(unsigned short *) (bh->b_data+510) == 0xAA55) {
 		p = 0x1BE + (void *)bh->b_data;
 		for (i=0 ; i<4 ; i++,p++) {
+			if (!(hd[i+minor].nr_sects = p->nr_sects))
+				continue;
 			hd[i+minor].start_sect = p->start_sect;
-			hd[i+minor].nr_sects = p->nr_sects;
-		}
-		if (p->nr_sects && p->sys_ind == EXTENDED_PARTITION) {
+			if ((current_minor & 0x3f) >= 60)
+				continue;
+			if (p->sys_ind == EXTENDED_PARTITION) {
 				current_minor += 4;
-			check_partition(i+minor);
+				check_partition(0x0300 | (i+minor));
+			}
+		}
+		/*
+		 * check for Disk Manager partition table
+		 */
+		if (*(unsigned short *) (bh->b_data+0xfc) == 0x55AA) {
+			p = 0x1BE + (void *)bh->b_data;
+			for (i=4; i<16; i++) {
+				p--;
+				if ((current_minor & 0x3f) >= 60)
+					break;
+				if (!(hd[current_minor+4].start_sect = p->start_sect))
+					continue;
+				hd[current_minor+4].nr_sects = p->nr_sects;
+				current_minor++;
+			}
 		}
 	} else
 		printk("Bad partition table on dev %04x\n",dev);
@@ -196,7 +218,8 @@ static int win_result(void)
 	if ((i & (BUSY_STAT | READY_STAT | WRERR_STAT | SEEK_STAT | ERR_STAT))
 		== (READY_STAT | SEEK_STAT))
 		return(0); /* ok */
-	if (i&1) i=inb(HD_ERROR);
+	if (i&1)
+		i=inb(HD_ERROR);
 	return (1);
 }
 
@@ -289,11 +312,15 @@ static void bad_rw_intr(void)
 		end_request(0);
 	if (CURRENT->errors > MAX_ERRORS/2)
 		reset = 1;
+	else
+		recalibrate = 1;
 }
 
 static void read_intr(void)
 {
+	SET_INTR(&read_intr);
 	if (win_result()) {
+		SET_INTR(NULL);
 		bad_rw_intr();
 		do_hd_request();
 		return;
@@ -302,10 +329,9 @@ static void read_intr(void)
 	CURRENT->errors = 0;
 	CURRENT->buffer += 512;
 	CURRENT->sector++;
-	if (--CURRENT->nr_sectors) {
-		SET_INTR(&read_intr);
+	if (--CURRENT->nr_sectors)
 		return;
-	}
+	SET_INTR(NULL);
 	end_request(1);
 	do_hd_request();
 }
@@ -337,13 +363,13 @@ static void recal_intr(void)
 
 static void hd_times_out(void)
 {	
+	do_hd = NULL;
+	reset = 1;
 	if (!CURRENT)
 		return;
 	printk("HD timeout");
 	if (++CURRENT->errors >= MAX_ERRORS)
 		end_request(0);
-	SET_INTR(NULL);
-	reset = 1;
 	do_hd_request();
 }
 
@@ -357,7 +383,8 @@ void do_hd_request(void)
 	INIT_REQUEST;
 	dev = MINOR(CURRENT->dev);
 	block = CURRENT->sector;
-	if (dev >= (NR_HD<<6) || block+2 > hd[dev].nr_sects) {
+	nsect = CURRENT->nr_sectors;
+	if (dev >= (NR_HD<<6) || block+nsect > hd[dev].nr_sects) {
 		end_request(0);
 		goto repeat;
 	}
@@ -368,7 +395,6 @@ void do_hd_request(void)
 	head = block % hd_info[dev].head;
 	cyl = block / hd_info[dev].head;
 	sec++;
-	nsect = CURRENT->nr_sectors;
 	if (reset) {
 		recalibrate = 1;
 		reset_hd();
@@ -376,7 +402,7 @@ void do_hd_request(void)
 	}
 	if (recalibrate) {
 		recalibrate = 0;
-		hd_out(dev,hd_info[CURRENT_DEV].sect,0,0,0,
+		hd_out(dev,hd_info[dev].sect,0,0,0,
 			WIN_RESTORE,&recal_intr);
 		if (reset)
 			goto repeat;
@@ -404,7 +430,7 @@ void do_hd_request(void)
 void hd_init(void)
 {
 	blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
-	set_trap_gate(0x2E,&hd_interrupt);
+	set_intr_gate(0x2E,&hd_interrupt);
 	outb_p(inb_p(0x21)&0xfb,0x21);
 	outb(inb_p(0xA1)&0xbf,0xA1);
 	timer_table[HD_TIMER].fn = hd_times_out;

kernel/chr_drv/keyboard.S

@@ -32,7 +32,7 @@
 /*
  * these are for the keyboard read functions
  */
-size	= 1024		/* must be a power of two ! And MUST be the same
+size	= 2048		/* must be a power of two ! And MUST be the same
 			   as in tty_io.c !!!! */
 head = 4
 tail = 8
@@ -434,7 +434,7 @@ key_map:
 
 shift_map:
 	.byte 0,27
-	.ascii "!\"#$%%&*()_+"
+	.ascii "!\"#$%^&*()_+"
 	.byte 127,9
 	.ascii "QWERTYUIOP{}"
 	.byte 13,0
@@ -626,7 +626,7 @@ do_self:
 	testb $0x20,_kmode		/* alt-gr */
 	jne 1f
 	lea shift_map,%ebx
-	testb $0x03,_kmode
+	testb $0x0f,_kmode
 	jne 1f
 	lea key_map,%ebx
 1:	movb (%ebx,%eax),%al
@@ -641,11 +641,7 @@ do_self:
 	subb $32,%al
 2:	testb $0x0c,_kmode		/* ctrl */
 	je 3f
-	cmpb $64,%al
-	jb 3f
-	cmpb $64+32,%al
-	jae 3f
-	subb $64,%al
+	andb $0x1f,%al
 3:	testb $0x10,_kmode		/* left alt */
 	je 4f
 	orb $0x80,%al

kernel/chr_drv/rs_io.s

@@ -13,7 +13,7 @@
 .text
 .globl _rs1_interrupt,_rs2_interrupt
 
-size	= 1024				/* must be power of two !
+size	= 2048				/* must be power of two !
 					   and must match the value
 					   in tty_io.c!!! */
 
@@ -29,16 +29,21 @@ startup	= 256		/* chars left in write queue when we restart it */
 /*
  * These are the actual interrupt routines. They look where
  * the interrupt is coming from, and take appropriate action.
+ *
+ * rs1_interrupt (IRQ 4) takes care of com1 and com3
+ * rs2_interrupt (IRQ 3) takes care of com2 and com4
  */
 .align 2
 _rs1_interrupt:
 	pushl $_table_list+8
+	pushl $_table_list+24
 	jmp rs_int
+
 .align 2
 _rs2_interrupt:
 	pushl $_table_list+16
-rs_int:
-	cld
+	pushl $_table_list+32
+rs_int:	cld
 	pushl %edx
 	pushl %ecx
 	pushl %ebx
@@ -50,32 +55,39 @@ rs_int:
 	pushl $0x10
 	pop %es
 	movl 24(%esp),%edx
+	call do_rs_intr
+	movl 28(%esp),%edx
+	call do_rs_intr
+	movb $0x20,%al
+	outb %al,$0x20		/* EOI */
+	pop %ds
+	pop %es
+	popl %eax
+	popl %ebx
+	popl %ecx
+	popl %edx
+	addl $8,%esp		# jump over the _table_list entries
+	iret
+
+do_rs_intr:
+	pushl %edx
 	movl (%edx),%edx
 	movl rs_addr(%edx),%edx
 	addl $2,%edx		/* interrupt ident. reg */
-rep_int:
-	xorl %eax,%eax
+1:	xorl %eax,%eax
 	inb %dx,%al
 	testb $1,%al
-	jne end
+	jne 2f
 	cmpb $6,%al		/* this shouldn't happen, but ... */
-	ja end
-	movl 24(%esp),%ecx
+	ja 2f
+	movl (%esp),%ecx
 	pushl %edx
 	subl $2,%edx
 	call jmp_table(,%eax,2)		/* NOTE! not *4, bit0 is 0 already */
 	popl %edx
-	jmp rep_int
-end:	movb $0x20,%al
-	outb %al,$0x20		/* EOI */
-	pop %ds
-	pop %es
-	popl %eax
-	popl %ebx
-	popl %ecx
-	popl %edx
-	addl $4,%esp		# jump over _table_list entry
-	iret
+	jmp 1b
+2:	popl %edx
+	ret
 
 jmp_table:
 	.long modem_status,write_char,read_char,line_status
@@ -112,7 +124,7 @@ read_char:
 
 .align 2
 mask_table:
-	.long 0,4,8
+	.long 0,4,8,16,32
 
 .align 2
 write_char:
@@ -136,6 +148,7 @@ write_char:
 	cmpl head(%ecx),%ebx
 	je write_buffer_empty
 	ret
+
 .align 2
 write_buffer_empty:
 	movl proc_list(%ecx),%ebx	# wake up sleeping process
@@ -146,6 +159,6 @@ write_buffer_empty:
 	inb %dx,%al
 	jmp 1f
 1:	jmp 1f
-1:	andb $0xd,%al		/* disable transmit interrupt */
+1:	andb $0xd,%al			# disable transmit interrupt
 	outb %al,%dx
 	ret

kernel/chr_drv/serial.c

@@ -34,6 +34,16 @@ static void com2_timer(void)
 	copy_to_cooked(tty_table+65);
 }
 
+static void com3_timer(void)
+{
+	copy_to_cooked(tty_table+66);
+}
+
+static void com4_timer(void)
+{
+	copy_to_cooked(tty_table+67);
+}
+
 static inline void do_rs_write(unsigned int port)
 {
 	char c;
@@ -66,17 +76,55 @@ static void com2_timeout(void)
 	do_rs_write(1);
 }
 
+static void com3_timeout(void)
+{
+	do_rs_write(2);
+}
+
+static void com4_timeout(void)
+{
+	do_rs_write(3);
+}
+
 static void init(int port)
 {
 	outb_p(0x80,port+3);	/* set DLAB of line control reg */
 	outb_p(0x30,port);	/* LS of divisor (48 -> 2400 bps */
 	outb_p(0x00,port+1);	/* MS of divisor */
 	outb_p(0x03,port+3);	/* reset DLAB */
-	outb_p(0x0b,port+4);	/* set DTR,RTS, OUT_2 */
+	outb_p(0x00,port+4);	/* reset DTR,RTS, OUT_2 */
 	outb_p(0x0d,port+1);	/* enable all intrs but writes */
 	(void)inb(port);	/* read data port to reset things (?) */
 }
 
+/*
+ * this routine enables interrupts on 'line', and disables them on
+ * 'line ^ 2', as they share the same IRQ. Braindamaged AT hardware.
+ */
+void serial_open(unsigned int line)
+{
+	unsigned short port;
+	unsigned short port2;
+
+	if (line>3)
+		return;
+	port = tty_table[64+line].read_q->data;
+	if (!port)
+		return;
+	port2 = tty_table[64+(line ^ 2)].read_q->data;
+	cli();
+	if (port2)
+		outb_p(0x00,port2+4);
+	outb_p(0x03,port+3);	/* reset DLAB */
+	outb_p(0x0f,port+4);	/* set DTR,RTS, OUT_2 */
+	outb_p(0x0d,port+1);	/* enable all intrs but writes */
+	inb_p(port+5);
+	inb_p(port+0);
+	inb(port+6);
+	inb(port+2);
+	sti();
+}
+
 void rs_init(void)
 {
 /* SERx_TIMER timers are used for receiving: timeout is always 0 (immediate) */
@@ -84,15 +132,25 @@ void rs_init(void)
 	timer_table[SER1_TIMER].expires = 0;
 	timer_table[SER2_TIMER].fn = com2_timer;
 	timer_table[SER2_TIMER].expires = 0;
+	timer_table[SER3_TIMER].fn = com3_timer;
+	timer_table[SER3_TIMER].expires = 0;
+	timer_table[SER4_TIMER].fn = com4_timer;
+	timer_table[SER4_TIMER].expires = 0;
 /* SERx_TIMEOUT timers are used for writing: prevent serial lockups */
 	timer_table[SER1_TIMEOUT].fn = com1_timeout;
 	timer_table[SER1_TIMEOUT].expires = 0;
 	timer_table[SER2_TIMEOUT].fn = com2_timeout;
 	timer_table[SER2_TIMEOUT].expires = 0;
+	timer_table[SER3_TIMEOUT].fn = com3_timeout;
+	timer_table[SER3_TIMEOUT].expires = 0;
+	timer_table[SER4_TIMEOUT].fn = com4_timeout;
+	timer_table[SER4_TIMEOUT].expires = 0;
 	set_intr_gate(0x24,rs1_interrupt);
 	set_intr_gate(0x23,rs2_interrupt);
 	init(tty_table[64].read_q->data);
 	init(tty_table[65].read_q->data);
+	init(tty_table[66].read_q->data);
+	init(tty_table[67].read_q->data);
 	outb(inb_p(0x21)&0xE7,0x21);
 }
 
@@ -108,6 +166,6 @@ void rs_write(struct tty_struct * tty)
 	cli();
 	if (!EMPTY(tty->write_q))
 		outb_p(inb_p(tty->write_q->data+1)|0x02,tty->write_q->data+1);
-	timer_active |= 3 << SER1_TIMEOUT;
+	timer_active |= 15 << SER1_TIMEOUT;
 	sti();
 }

kernel/chr_drv/tty_io.c

@@ -83,7 +83,9 @@ int fg_console = 0;
 struct tty_queue * table_list[]={
 	con_queues + 0, con_queues + 1,
 	rs_queues + 0, rs_queues + 1,
-	rs_queues + 3, rs_queues + 4
+	rs_queues + 3, rs_queues + 4,
+	rs_queues + 6, rs_queues + 7,
+	rs_queues + 9, rs_queues + 10
 	};
 
 void change_console(unsigned int new_console)
@@ -122,15 +124,27 @@ void copy_to_cooked(struct tty_struct * tty)
 {
 	unsigned char c;
 
-	if (!(tty->read_q || tty->write_q || tty->secondary)) {
+	if (!(tty && tty->write && tty->read_q &&
+	    tty->write_q && tty->secondary)) {
 		printk("copy_to_cooked: missing queues\n\r");
 		return;
 	}
+	cli();
+	if (tty->busy) {
+		sti();
+		return;
+	}
+	tty->busy = 1;
+	sti();
 	while (1) {
 		if (EMPTY(tty->read_q))
 			break;
-		if (FULL(tty->secondary))
+		if (FULL(tty->secondary)) {
+			if (tty->secondary->proc_list)
+				if (tty->secondary->proc_list != current)
+					current->counter = 0;
 			break;
+		}
 		GETCH(tty->read_q,c);
 		if (c==13) {
 			if (I_CRNL(tty))
@@ -153,7 +167,6 @@ void copy_to_cooked(struct tty_struct * tty)
 						if (c<32)
 							PUTCH(127,tty->write_q);
 						PUTCH(127,tty->write_q);
-						tty->write(tty);
 					}
 					DEC(tty->secondary->head);
 				}
@@ -170,7 +183,6 @@ void copy_to_cooked(struct tty_struct * tty)
 					if (c<32)
 						PUTCH(127,tty->write_q);
 					PUTCH(127,tty->write_q);
-					tty->write(tty);
 				}
 				DEC(tty->secondary->head);
 				continue;
@@ -180,13 +192,11 @@ void copy_to_cooked(struct tty_struct * tty)
 			if ((STOP_CHAR(tty) != _POSIX_VDISABLE) &&
 			    (c==STOP_CHAR(tty))) {
 				tty->stopped=1;
-				tty->write(tty);
 				continue;
 			}
 			if ((START_CHAR(tty) != _POSIX_VDISABLE) &&
 			    (c==START_CHAR(tty))) {
 				tty->stopped=0;
-				tty->write(tty);
 				continue;
 			}
 		}
@@ -221,9 +231,11 @@ void copy_to_cooked(struct tty_struct * tty)
 			} else
 				PUTCH(c,tty->write_q);
 		}
-		tty->write(tty);
 		PUTCH(c,tty->secondary);
 	}
+	tty->write(tty);
+	tty->busy = 0;
+	if (!EMPTY(tty->secondary))
 		wake_up(&tty->secondary->proc_list);
 }
 
@@ -270,7 +282,8 @@ int tty_read(unsigned channel, char * buf, int nr, unsigned short flags)
 	tty = TTY_TABLE(channel);
 	if (!(tty->read_q && tty->secondary))
 		return -EIO;
-	if ((current->tty == channel) && (tty->pgrp != current->pgrp)) 
+	if ((tty->pgrp > 0) && (current->tty == channel) &&
+	    (tty->pgrp != current->pgrp))
 		return(tty_signal(SIGTTIN, tty));
 	if (channel & 0x80)
 		other_tty = tty_table + (channel ^ 0x40);
@@ -295,15 +308,14 @@ int tty_read(unsigned channel, char * buf, int nr, unsigned short flags)
 	copy_to_cooked(tty);
 	while (nr>0) {
 		if (other_tty && other_tty->write)
-			other_tty->write(other_tty);
+			TTY_WRITE(other_tty);
 		cli();
 		if (EMPTY(tty->secondary) || (L_CANON(tty) &&
 		    !FULL(tty->read_q) && !tty->secondary->data)) {
-			if (!current->timeout ||
-			  (current->signal & ~current->blocked)) {
-			  	sti();
+			if (!current->timeout)
+				break;
+			if (current->signal & ~current->blocked) 
 				break;
-			}
 			if (IS_A_PTY_SLAVE(channel) && C_HUP(other_tty))
 				break;
 			interruptible_sleep_on(&tty->secondary->proc_list);
@@ -329,11 +341,12 @@ int tty_read(unsigned channel, char * buf, int nr, unsigned short flags)
 				break;
 		} while (nr>0 && !EMPTY(tty->secondary));
 		wake_up(&tty->read_q->proc_list);
-		if (time)
-			current->timeout = time+jiffies;
 		if (L_CANON(tty) || b-buf >= minimum)
 			break;
+		if (time)
+			current->timeout = time+jiffies;
 	}
+	sti();
 	current->timeout = 0;
 	if (b-buf)
 		return b-buf;
@@ -355,9 +368,13 @@ int tty_write(unsigned channel, char * buf, int nr)
 	tty = TTY_TABLE(channel);
 	if (!(tty->write_q && tty->write))
 		return -EIO;
-	if (L_TOSTOP(tty) && 
+	if (L_TOSTOP(tty) &&  (tty->pgrp > 0) &&
 	    (current->tty == channel) && (tty->pgrp != current->pgrp)) 
 		return(tty_signal(SIGTTOU, tty));
+	if (nr < 0)
+		return -EINVAL;
+	if (!nr)
+		return 0;
 	while (nr>0) {
 		sleep_if_full(tty->write_q);
 		if (current->signal & ~current->blocked)
@@ -381,11 +398,15 @@ int tty_write(unsigned channel, char * buf, int nr)
 			cr_flag = 0;
 			PUTCH(c,tty->write_q);
 		}
-		tty->write(tty);
+		TTY_WRITE(tty);
 		if (nr>0)
 			schedule();
 	}
-	return (b-buf);
+	if (b-buf)
+		return b-buf;
+	if (current->signal & ~current->blocked)
+		return -ERESTARTSYS;
+	return 0;
 }
 
 void chr_dev_init(void)
@@ -402,10 +423,14 @@ void tty_init(void)
 	rs_queues[1] = (struct tty_queue) {0x3f8,0,0,0,""};
 	rs_queues[3] = (struct tty_queue) {0x2f8,0,0,0,""};
 	rs_queues[4] = (struct tty_queue) {0x2f8,0,0,0,""};
+	rs_queues[6] = (struct tty_queue) {0x3e8,0,0,0,""};
+	rs_queues[7] = (struct tty_queue) {0x3e8,0,0,0,""};
+	rs_queues[9] = (struct tty_queue) {0x2e8,0,0,0,""};
+	rs_queues[10] = (struct tty_queue) {0x2e8,0,0,0,""};
 	for (i=0 ; i<256 ; i++) {
 		tty_table[i] =  (struct tty_struct) {
 		 	{0, 0, 0, 0, 0, INIT_C_CC},
-			0, 0, 0, {0,0,0,0},
+			-1, 0, 0, 0, {0,0,0,0},
 			NULL, NULL, NULL, NULL
 		};
 	}
@@ -418,9 +443,10 @@ void tty_init(void)
 			IXON | ISIG | ICANON | ECHO | ECHOCTL | ECHOKE,
 			0,		/* console termio */
 			INIT_C_CC},
-			0,			/* initial pgrp */
+			-1,		/* initial pgrp */
 			0,			/* initial session */
 			0,			/* initial stopped */
+			0,			/* initial busy */
 			{video_num_lines,video_num_columns,0,0},
 			con_write,
 			con_queues+0+i*3,con_queues+1+i*3,con_queues+2+i*3
@@ -434,6 +460,7 @@ void tty_init(void)
 			0,
 			0,
 			INIT_C_CC},
+			-1,
 			0,
 			0,
 			0,
@@ -450,6 +477,7 @@ void tty_init(void)
 			0,
 			0,
 			INIT_C_CC},
+			-1,
 			0,
 			0,
 			0,
@@ -464,6 +492,7 @@ void tty_init(void)
 			IXON | ISIG | ICANON,
 			0,
 			INIT_C_CC},
+			-1,
 			0,
 			0,
 			0,

kernel/chr_drv/tty_ioctl.c

@@ -53,7 +53,12 @@ static void flush(struct tty_queue * queue)
 
 static void wait_until_sent(struct tty_struct * tty)
 {
-	/* do nothing - not implemented */
+	cli();
+	while (!(current->signal & ~current->blocked) && !EMPTY(tty->write_q)) {
+		current->counter = 0;
+		interruptible_sleep_on(&tty->write_q->proc_list);
+	}
+	sti();
 }
 
 static void send_break(struct tty_struct * tty)
@@ -137,7 +142,7 @@ static int get_termio(struct tty_struct * tty, struct termio * termio)
 }
 
 /*
- * This only works as the 386 is low-byt-first
+ * This only works as the 386 is low-byte-first
  */
 static int set_termio(struct tty_struct * tty, struct termio * termio,
 			int channel)
@@ -255,11 +260,11 @@ int tty_ioctl(int dev, int cmd, int arg)
 			switch (arg) {
 			case TCOOFF:
 				tty->stopped = 1;
-				tty->write(tty);
+				TTY_WRITE(tty);
 				return 0;
 			case TCOON:
 				tty->stopped = 0;
-				tty->write(tty);
+				TTY_WRITE(tty);
 				return 0;
 			case TCIOFF:
 				if (STOP_CHAR(tty))

kernel/exit.c

@@ -359,9 +359,9 @@ volatile void do_exit(long code)
 
 		if (current->tty >= 0) {
 			tty = TTY_TABLE(current->tty);
-			if (tty->pgrp>0)
+			if (tty->pgrp > 0)
 				kill_pg(tty->pgrp, SIGHUP, 1);
-			tty->pgrp = 0;
+			tty->pgrp = -1;
 			tty->session = 0;
 		}
 	 	for (p = &LAST_TASK ; p > &FIRST_TASK ; --p)

kernel/sched.c

@@ -126,9 +126,9 @@ void schedule(void)
 
 	for(p = &LAST_TASK ; p > &FIRST_TASK ; --p)
 		if (*p) {
-			if ((*p)->timeout && (*p)->timeout < jiffies) {
+			if ((*p)->timeout && (*p)->timeout < jiffies)
+				if ((*p)->state == TASK_INTERRUPTIBLE) {
 					(*p)->timeout = 0;
-				if ((*p)->state == TASK_INTERRUPTIBLE)
 					(*p)->state = TASK_RUNNING;
 				}
 			if ((*p)->alarm && (*p)->alarm < jiffies) {
@@ -178,29 +178,45 @@ int sys_pause(void)
 	return -EINTR;
 }
 
+void wake_up(struct task_struct **p)
+{
+	struct task_struct * wakeup_ptr, * tmp;
+
+	if (p && *p) {
+		wakeup_ptr = *p;
+		*p = NULL;
+		while (wakeup_ptr && wakeup_ptr != task[0]) {
+			if (wakeup_ptr->state == TASK_STOPPED)
+				printk("wake_up: TASK_STOPPED\n");
+			else if (wakeup_ptr->state == TASK_ZOMBIE)
+				printk("wake_up: TASK_ZOMBIE\n");
+			else
+				wakeup_ptr->state = TASK_RUNNING;
+			tmp = wakeup_ptr->next_wait;
+			wakeup_ptr->next_wait = task[0];
+			wakeup_ptr = tmp;
+		}
+	}
+}
+
 static inline void __sleep_on(struct task_struct **p, int state)
 {
-	struct task_struct *tmp;
 	unsigned int flags;
 
 	if (!p)
 		return;
-	if (current == &(init_task.task))
+	if (current == task[0])
 		panic("task[0] trying to sleep");
 	__asm__("pushfl ; popl %0":"=r" (flags));
-	tmp = *p;
+	current->next_wait = *p;
+	task[0]->next_wait = NULL;
 	*p = current;
 	current->state = state;
-/* make sure interrupts are enabled: there should be no more races here */
 	sti();
-repeat:	schedule();
-	if (*p && *p != current) {
-		current->state = TASK_UNINTERRUPTIBLE;
-		(**p).state = 0;
-		goto repeat;
-	}
-	if (*p = tmp)
-		tmp->state=0;
+	schedule();
+	if (current->next_wait != task[0])
+		wake_up(p);
+	current->next_wait = NULL;
 	__asm__("pushl %0 ; popfl"::"r" (flags));
 }
 
@@ -214,17 +230,6 @@ void sleep_on(struct task_struct **p)
 	__sleep_on(p,TASK_UNINTERRUPTIBLE);
 }
 
-void wake_up(struct task_struct **p)
-{
-	if (p && *p) {
-		if ((**p).state == TASK_STOPPED)
-			printk("wake_up: TASK_STOPPED");
-		if ((**p).state == TASK_ZOMBIE)
-			printk("wake_up: TASK_ZOMBIE");
-		(**p).state=0;
-	}
-}
-
 /*
  * OK, here are some floppy things that shouldn't be in the kernel
  * proper. They are here because the floppy needs a timer, and this
@@ -261,14 +266,6 @@ int ticks_to_floppy_on(unsigned int nr)
 	return mon_timer[nr];
 }
 
-void floppy_on(unsigned int nr)
-{
-	cli();
-	while (ticks_to_floppy_on(nr))
-		sleep_on(nr+wait_motor);
-	sti();
-}
-
 void floppy_off(unsigned int nr)
 {
 	moff_timer[nr]=3*HZ;

mm/Makefile

@@ -17,8 +17,6 @@ CPP	=gcc -E -nostdinc -I../include
 
 OBJS	= memory.o swap.o
 
-all: mm.o
-
 mm.o: $(OBJS)
 	$(LD) -r -o mm.o $(OBJS)
 

mm/memory.c

@@ -213,7 +213,13 @@ static unsigned long put_page(unsigned long page,unsigned long address)
 		*page_table = tmp | 7;
 		page_table = (unsigned long *) tmp;
 	}
-	page_table[(address>>12) & 0x3ff] = page | 7;
+	page_table += (address>>12) & 0x3ff;
+	if (*page_table) {
+		printk("put_page: page already exists\n");
+		*page_table = 0;
+		invalidate();
+	}
+	*page_table = page | 7;
 /* no need for invalidate */
 	return page;
 }
@@ -243,7 +249,13 @@ unsigned long put_dirty_page(unsigned long page, unsigned long address)
 		*page_table = tmp|7;
 		page_table = (unsigned long *) tmp;
 	}
-	page_table[(address>>12) & 0x3ff] = page | (PAGE_DIRTY | 7);
+	page_table += (address>>12) & 0x3ff;
+	if (*page_table) {
+		printk("put_dirty_page: page already exists\n");
+		*page_table = 0;
+		invalidate();
+	}
+	*page_table = page | (PAGE_DIRTY | 7);
 /* no need for invalidate */
 	return page;
 }
@@ -296,8 +308,10 @@ void un_wp_page(unsigned long * table_entry)
  */
 void do_wp_page(unsigned long error_code,unsigned long address)
 {
-	if (address < TASK_SIZE)
+	if (address < TASK_SIZE) {
 		printk("\n\rBAD! KERNEL MEMORY WP-ERR!\n\r");
+		do_exit(SIGSEGV);
+	}
 	if (address - current->start_code >= TASK_SIZE) {
 		printk("Bad things happen: page error in do_wp_page\n\r");
 		do_exit(SIGSEGV);
@@ -305,7 +319,6 @@ void do_wp_page(unsigned long error_code,unsigned long address)
 	un_wp_page((unsigned long *)
 		(((address>>10) & 0xffc) + (0xfffff000 &
 		*((unsigned long *) ((address>>20) &0xffc)))));
-
 }
 
 void write_verify(unsigned long address)
@@ -436,8 +449,10 @@ void do_no_page(unsigned long error_code,
 	if (last_checked >= CHECK_LAST_NR)
 		last_checked = 0;
 	last_pages[last_checked] = address & 0xfffff000;
-	if (address < TASK_SIZE)
+	if (address < TASK_SIZE) {
 		printk("\n\rBAD!! KERNEL PAGE MISSING\n\r");
+		do_exit(SIGSEGV);
+	}
 	if (address - tsk->start_code >= TASK_SIZE) {
 		printk("Bad things happen: nonexistent page error in do_no_page\n\r");
 		do_exit(SIGSEGV);
@@ -567,12 +582,12 @@ void show_mem(void)
 /* This routine handles page faults.  It determines the address,
    and the problem then passes it off to one of the appropriate
    routines. */
-void do_page_fault (unsigned long *esp, unsigned long error_code)
+void do_page_fault(unsigned long *esp, unsigned long error_code)
 {
 	unsigned long address;
 	/* get the address */
 
-	__asm__ ("movl %%cr2,%0":"=r" (address));
+	__asm__("movl %%cr2,%0":"=r" (address));
 	if (!(error_code & 1)) {
 		do_no_page(error_code, address, current);
 		return;

mm/swap.c

@@ -155,37 +155,38 @@ int swap_out(void)
 	static int dir_entry = 1024;
 	static int page_entry = -1;
 	int counter = VM_PAGES;
-	int pg_table = 0;
+	int pg_table;
 
-repeat:
-	while (counter > 0) {
-		counter -= 1024;
-		dir_entry++;
+check_dir:
+	if (counter < 0)
+		goto no_swap;
 	if (dir_entry >= 1024)
 		dir_entry = FIRST_VM_PAGE>>10;
-		if (pg_table = pg_dir[dir_entry])
-			break;
+	if (!(1 & (pg_table = pg_dir[dir_entry]))) {
+		if (pg_table) {
+			printk("bad page-table at pg_dir[%d]: %08x\n\r",
+				dir_entry,pg_table);
+			pg_dir[dir_entry] = 0;
 		}
-	if (counter <= 0) {
-		printk("Out of swap-memory\n");
-		return 0;
-	}
-	if (!(pg_table & 1)) {
-		printk("bad page-table at pg_dir[%d]: %08x\n\r",dir_entry,
-			pg_table);
-		return 0;
+		counter -= 1024;
+		dir_entry++;
+		goto check_dir;
 	}
 	pg_table &= 0xfffff000;
-	while (counter > 0) {
+check_table:
+	if (counter < 0)
+		goto no_swap;
 	counter--;
 	page_entry++;
 	if (page_entry >= 1024) {
 		page_entry = -1;
-			goto repeat;
+		dir_entry++;
+		goto check_dir;
 	}
 	if (try_to_swap_out(page_entry + (unsigned long *) pg_table))
 		return 1;
-	}
+	goto check_table;
+no_swap:
 	printk("Out of swap-memory\n\r");
 	return 0;
 }