[PATCH] Linux-0.99.15 (February 2, 1994)

sbpcd (Sound Blaster Pro CD interface) driver.

Andries Brouwer cleans up and re-does keyboard driver diacritical handling.

Lots of new sound drivers.

Sysvfs added (Xenix, SystemV/386 and Coherent support).  Linux was
starting to have a lot of users move over..

MAP_ANONYMOUS flag added to mmap().

Loadable modules added.

Alan Cox is active in networking.

[original changelog below]

Linux 0.99.15 released: Codefreeze for 1.0

People who look into my directory on ftp.funet.fi will already have
noticed that the latest version of linux (0.99.15) is available, and I
assume it will be available on most other linux sites soon.  As
explained in a previous announcement, 0.99.15 is "it", in that this will
be the base for 1.0 after about a month of testing.  No further patches
are accepted until the 1.0 release, unless they obviously fix a serious
bug.

**** NOTE 1 ****

  For this code-freeze to be effective yet still potential bugs be
  found, testing is needed, along with good reports of errors and
  problems.  Thus, nobody should think "hey, the *real* release will be
  out in a month, let's wait for that", but instead think: "hey, I'd
  better test this one, so that the *real* release won't result in any
  ugly surprises for me".

  In short: test it out, preferably even more than you usually do.  Run
  "crashme" for the whole month if you have the CPU-power to spare,
  and/or just misuse your machine as badly as you can.  And if there are
  problems, report them to me (and the better the report, the more
  likely I am to be able to do something about it).

**** NOTE 2 ****

  Bumping the linux version number to 1.0 doesn't mean anything more
  than that: it's only a version number change.  More explicitly, it
  does *NOT* mean that linux will become commercial (the copyright will
  remain as-is), nor does it mean that development stops here, and that
  1.0 will be anything special in that respect.

  I'm also afraid that just changing the version number will not make
  potential bugs magically disappear: this has been amply proven by
  various software houses over the years.  This code-freeze is there in
  order to avoid most of the problems that people sometimes associate
  with "X.0 releases", and I hope that it will mean that we have a
  reasonably stable release that we can call 1.0 and one that I won't
  have to be ashamed of.

  Ok, enough said, I hope.  The pl15 release is hopefully good, but I'll
  continue to make ALPHA patches against it along the whole month as
  problems crop up.  The networking code has been much maligned, and is
  not perfect by far yet, but it's getting its act together thanks to
  various developers and testers.  And as wiser men than I have said (or
  if they haven't, they should have):

      "There is life after 1.0"

  Any rumors that the world is coming to an end just because I'm about to
  release a 1.0-version are greatly exaggerated.  I think.

                    Linus

----------
Things that remained the same between 0.99.14 and 0.99.15:

- I again forgot to update the README before uploading the release.  In
  pl14, I talked about pl13, while the all new and improved README has
  now caught up with pl14.  Remind me to buy a new brain one of these
  days.

Changes between versions 0.99.14 and 0.99.15:

 - improved Pentium detection.  Some of you may have had linux report
   your 4086DX2 as a pentium machine, but the new kernel will tell you
   the sad truth.  Whee.
 - Network driver updates by Donald Becker.  New drivers added, old ones
   updated.
 - FPU emulation updates by Bill Metzenthen.  Various minor errors and
   misfeatures fixed (mostly error handling).
 - Support for the SoubdBlaster Pro CD-ROM driver added by Eberhard
   Moenkeberg.
 - extended support for keyboard re-definition, along with font
   re-programming (Eugene Crosser, Andries Brouwer et al).
 - tty handling fixes: true canonical mode with most features supported
   by Julian Cowley.  This may make your canonical mode behave funnily
   if you happen to use old and broken programs that happened to work
   with the old and broken behaviour (this includes at least some
   'getty' programs).
 - serial driver changes and tty fixes by Theodore Ts'o.
 - SCSI fixes by Drew Eckhardt, Eric Youngdale, Rik Faith, Kai Mdkisara
   et al.
 - Updated sound card driver to version 2.4 (Hannu Savolainen)
 - COFF binary loading support (but you will still need the experimental
   iBCS2 patches to run non-linux i386 COFF binaries) by Al Longyear.
 - Upgraded ext2fs filesystem routines (0.4a -> 0.4b), with new
   features.  Read the fs/ext2/CHANGES file for details.  Remy Card and
   Stephen Tweedie.  Get a new fsck that knows about the new features.
 - pipe behaviour fixed in the presense of multiple writers (now
   actually conforms to POSIX specs about atomic writes).  Much of the
   code by Florian Coosmann.
 - minix filesystem extended to support the clean flag: get a new fsck
   that knows about it.
 - System V filesystem (support for Xenix, Coherent and SysV
   filesystems) by Doug Evans, Paul Monday, Pascal Haible and Bruno
   Haible.
 - loadable modules (various authors, don't remember original author of
   the "modules" code).
 - Lots of networking fixes by various people: Alan Cox, Charles
   Hedrick, me and various other people.  Non-byte-aligned networks
   work, and the networking code should be much stabler in general.

 + various bugfixes and enhacements here and there (mcd driver update by
   Jon Tombs, atixlmouse fix by Chris Colohan, /dev/full by XXX etc etc)

All in all, the patches come out to 1.5MB uncompressed (about 400kB
gzip-9'd), so there is little or no idea to make patches to plain pl14
available.  Incremental patches and ALPHA-releases can be found on
ftp.funet.fi: pub/OS/Linux/PEOPLE/Linus/ALPHA-pl14.

Makefile

 VERSION = 0.99
-PATCHLEVEL = 14
-ALPHA = z
+PATCHLEVEL = 15
+ALPHA =
 
 all:	Version zImage
 

boot/head.S

@@ -111,13 +111,24 @@ startup_32:
 	movl %ecx,%eax
 	xorl $0x200000,%eax	# check ID flag
 	pushl %eax
-	popfl			# if we are on a 486,
-	pushfl			# we can't change it
+	popfl			# if we are on a straight 486DX, SX, or
+	pushfl			# 487SX we can't change it
 	popl %eax
 	xorl %ecx,%eax
 	andl $0x200000,%eax
 	je is486
-	movl $5,_x86		# 586 setup same as 486 at least for now
+isnew:	pushl %ecx		# restore original EFLAGS
+	popfl
+	movl $1, %eax		# Use the CPUID instruction to 
+	.byte 0x0f, 0xa2	# check the processor type
+	andl $0xf00, %eax	# Set _x86 with the family
+	shrl $8, %eax		# returned.	
+	movl %eax, _x86
+	movl %edi,%esp		# restore esp
+	movl %cr0,%eax		# 486+
+	andl $0x80000011,%eax	# Save PG,PE,ET
+	orl $0x50022,%eax	# set AM, WP, NE and MP
+	jmp 2f
 is486:	pushl %ecx		# restore original EFLAGS
 	popfl
 	movl %edi,%esp		# restore esp

config.in

@@ -59,7 +59,7 @@ else
 bool 'SLIP (serial line) support' CONFIG_SLIP n
 if [ "$CONFIG_SLIP" = "y" ]
   bool ' CSLIP compressed headers' SL_COMPRESSED y
-  bool ' SLIP debugging on' SL_DUMP y
+#  bool ' SLIP debugging on' SL_DUMP y
 fi
 #bool 'PPP (point-to-point) support' CONFIG_PPP n
 bool 'PLIP (parallel port) support' CONFIG_PLIP n
@@ -104,8 +104,8 @@ bool 'System V and Coherent filesystem support' CONFIG_SYSV_FS n
 *
 *  character devices
 *
-bool 'Keyboard meta-key sends ESC-prefix' CONFIG_KBD_META y
-bool 'Keyboard Num Lock on by default' CONFIG_KBD_NUML y
+#bool 'Keyboard meta-key sends ESC-prefix' CONFIG_KBD_META y
+#bool 'Keyboard Num Lock on by default' CONFIG_KBD_NUML y
 bool 'Parallel printer support' CONFIG_PRINTER y
 bool 'Logitech busmouse support' CONFIG_BUSMOUSE n
 bool 'PS/2 mouse (aka "auxiliary device") support' CONFIG_PSMOUSE y

drivers/FPU-emu/errors.c

@@ -37,14 +37,20 @@
 void Un_impl(void)
 {
   unsigned char byte1, FPU_modrm;
+  unsigned long address = FPU_ORIG_EIP;
 
   RE_ENTRANT_CHECK_OFF;
   /* No need to verify_area(), we have previously fetched these bytes. */
-  byte1 = get_fs_byte((unsigned char *) FPU_ORIG_EIP);
-  FPU_modrm = get_fs_byte(1 + (unsigned char *) FPU_ORIG_EIP);
-
-  printk("Unimplemented FPU Opcode at eip=%p : %02x ",
-	 (void *) FPU_ORIG_EIP, byte1);
+  printk("Unimplemented FPU Opcode at eip=%p : ", (void *) address);
+  while ( 1 )
+    {
+      byte1 = get_fs_byte((unsigned char *) address);
+      if ( (byte1 & 0xf8) == 0xd8 ) break;
+      printk("[%02x]", byte1);
+      address++;
+    }
+  printk("%02x ", byte1);
+  FPU_modrm = get_fs_byte(1 + (unsigned char *) address);
 
   if (FPU_modrm >= 0300)
     printk("%02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7);
@@ -57,6 +63,15 @@ void Un_impl(void)
 }
 
 
+/*
+   Called for opcodes which are illegal and which are known to result in a
+   SIGILL with a real 80486.
+   */
+void FPU_illegal(void)
+{
+  math_abort(FPU_info,SIGILL);
+}
+
 
 
 void emu_printall()
@@ -65,11 +80,20 @@ void emu_printall()
   static char *tag_desc[] = { "Valid", "Zero", "ERROR", "ERROR",
                               "DeNorm", "Inf", "NaN", "Empty" };
   unsigned char byte1, FPU_modrm;
+  unsigned long address = FPU_ORIG_EIP;
 
   RE_ENTRANT_CHECK_OFF;
   /* No need to verify_area(), we have previously fetched these bytes. */
-  byte1 = get_fs_byte((unsigned char *) FPU_ORIG_EIP);
-  FPU_modrm = get_fs_byte(1 + (unsigned char *) FPU_ORIG_EIP);
+  printk("At %p: ", (void *) address);
+  while ( 1 )
+    {
+      byte1 = get_fs_byte((unsigned char *) address);
+      if ( (byte1 & 0xf8) == 0xd8 ) break;
+      printk("[%02x]", byte1);
+      address++;
+    }
+  printk("%02x ", byte1);
+  FPU_modrm = get_fs_byte(1 + (unsigned char *) address);
   partial_status = status_word();
 
 #ifdef DEBUGGING
@@ -88,7 +112,6 @@ if ( partial_status & SW_Denorm_Op )   printk("SW: denormalized operand\n");
 if ( partial_status & SW_Invalid )     printk("SW: invalid operation\n");
 #endif DEBUGGING
 
-  printk("At %p: %02x ", (void *) FPU_ORIG_EIP, byte1);
   if (FPU_modrm >= 0300)
     printk("%02x (%02x+%d)\n", FPU_modrm, FPU_modrm & 0xf8, FPU_modrm & 7);
   else
@@ -210,6 +233,7 @@ static struct {
 	      0x125  in fpu_trig.c
 	      0x126  in fpu_entry.c
 	      0x127  in poly_2xm1.c
+	      0x128  in fpu_entry.c
        0x2nn  in an *.S file:
               0x201  in reg_u_add.S, reg_round.S
               0x202  in reg_u_div.S

drivers/FPU-emu/fpu_aux.c

@@ -3,7 +3,7 @@
  |                                                                           |
  | Code to implement some of the FPU auxiliary instructions.                 |
  |                                                                           |
- | Copyright (C) 1992,1993                                                   |
+ | Copyright (C) 1992,1993,1994                                              |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  |                                                                           |
@@ -48,7 +48,8 @@ void finit()
 }
 
 static FUNC const finit_table[] = {
-  Un_impl, Un_impl, fclex, finit, Un_impl, Un_impl, Un_impl, Un_impl
+  Un_impl, Un_impl, fclex, finit,
+  Un_impl, FPU_illegal, FPU_illegal, FPU_illegal
 };
 
 void finit_()
@@ -64,7 +65,8 @@ static void fstsw_ax(void)
 }
 
 static FUNC const fstsw_table[] = {
-  fstsw_ax, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl
+  fstsw_ax, FPU_illegal, FPU_illegal, FPU_illegal,
+  FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal
 };
 
 void fstsw_()
@@ -79,7 +81,8 @@ static void fnop(void)
 }
 
 static FUNC const fp_nop_table[] = {
-  fnop, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl, Un_impl
+  fnop, FPU_illegal, FPU_illegal, FPU_illegal,
+  FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal
 };
 
 void fp_nop()

drivers/FPU-emu/fpu_emu.h

@@ -69,6 +69,19 @@ extern char emulating;
 #  define RE_ENTRANT_CHECK_ON
 #endif PARANOID
 
+#define FWAIT_OPCODE 0x9b
+#define OP_SIZE_PREFIX 0x66
+#define ADDR_SIZE_PREFIX 0x67
+#define PREFIX_CS 0x2e
+#define PREFIX_DS 0x3e
+#define PREFIX_ES 0x26
+#define PREFIX_SS 0x36
+#define PREFIX_FS 0x64
+#define PREFIX_GS 0x65
+#define PREFIX_REPE 0xf3
+#define PREFIX_REPNE 0xf2
+#define PREFIX_LOCK 0xf0
+
 /* These are to defeat the default action, giving the instruction
    no net effect: */
 #define NO_NET_DATA_EFFECT \
@@ -81,6 +94,7 @@ extern char emulating;
 
 typedef void (*FUNC)(void);
 typedef struct fpu_reg FPU_REG;
+typedef struct { unsigned char address_size, segment; } overrides;
 
 #define	st(x)	( regs[((top+x) &7 )] )
 

drivers/FPU-emu/fpu_entry.c

@@ -3,7 +3,7 @@
  |                                                                           |
  | The entry function for wm-FPU-emu                                         |
  |                                                                           |
- | Copyright (C) 1992,1993                                                   |
+ | Copyright (C) 1992,1993,1994                                              |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  |                                                                           |
@@ -34,17 +34,7 @@
 
 #include <asm/segment.h>
 
-#define FWAIT_OPCODE 0x9b
-#define OP_SIZE_PREFIX 0x66
-#define ADDR_SIZE_PREFIX 0x67
-#define PREFIX_CS 0x2e
-#define PREFIX_DS 0x3e
-#define PREFIX_ES 0x26
-#define PREFIX_SS 0x36
-#define PREFIX_FS 0x64
-#define PREFIX_GS 0x65
-
-#define __BAD__ Un_impl   /* Not implemented */
+#define __BAD__ FPU_illegal   /* Illegal on an 80486, causes SIGILL */
 
 #ifndef NO_UNDOC_CODE    /* Un-documented FPU op-codes supported by default. */
 
@@ -147,14 +137,13 @@ unsigned short FPU_data_selector;
 char emulating=0;
 #endif PARANOID
 
-#define bswapw(x) __asm__("xchgb %%al,%%ah":"=a" (x):"0" ((short)x))
-static int valid_prefix(unsigned char byte);
+static int valid_prefix(unsigned char *byte, overrides *override);
 
 
 asmlinkage void math_emulate(long arg)
 {
-  unsigned char  FPU_modrm;
-  unsigned short code;
+  unsigned char  FPU_modrm, byte1;
+  overrides override;
   int unmasked;
 
 #ifdef PARANOID
@@ -181,10 +170,11 @@ asmlinkage void math_emulate(long arg)
 
   SETUP_DATA_AREA(arg);
 
+  FPU_ORIG_EIP = FPU_EIP;
+
   /* We cannot handle emulation in v86-mode */
   if (FPU_EFLAGS & 0x00020000)
     {
-      FPU_ORIG_EIP = FPU_EIP;
       math_abort(FPU_info,SIGILL);
     }
 
@@ -198,7 +188,6 @@ asmlinkage void math_emulate(long arg)
   /* We cannot handle multiple segments yet */
   if (FPU_CS != USER_CS || FPU_DS != USER_DS)
     {
-      FPU_ORIG_EIP = FPU_EIP;
       math_abort(FPU_info,SIGILL);
     }
 
@@ -206,12 +195,18 @@ asmlinkage void math_emulate(long arg)
   if (current->flags & PF_PTRACED)
   	FPU_lookahead = 0;
 
+  if ( !valid_prefix(&byte1, &override) )
+    {
+      RE_ENTRANT_CHECK_OFF;
+      printk("FPU emulator: Unknown prefix byte 0x%02x\n", byte1);
+      RE_ENTRANT_CHECK_ON;
+      EXCEPTION(EX_INTERNAL|0x126);
+      math_abort(FPU_info,SIGILL);
+    }
+
 do_another_FPU_instruction:
 
-  RE_ENTRANT_CHECK_OFF;
-  FPU_code_verify_area(1);
-  code = get_fs_word((unsigned short *) FPU_EIP);
-  RE_ENTRANT_CHECK_ON;
+  FPU_EIP++;  /* We have fetched the prefix and first code bytes. */
 
 #ifdef PECULIAR_486
   /* It would be more logical to do this only in get_address(),
@@ -220,41 +215,36 @@ asmlinkage void math_emulate(long arg)
   FPU_data_selector = FPU_DS;
 #endif PECULIAR_486
 
-  if ( (code & 0xf8) != 0xd8 )
+  if ( (byte1 & 0xf8) != 0xd8 )
     {
-      if ( (code & 0xff) == FWAIT_OPCODE )
+      if ( byte1 == FWAIT_OPCODE )
 	{
 	  if (partial_status & SW_Summary)
 	    goto do_the_FPU_interrupt;
 	  else
-	    {
-	      FPU_EIP++;
-	      goto FPU_fwait_done;
-	    }
-	}
-      else if ( valid_prefix(code & 0xff) )
-	{
-	  goto do_another_FPU_instruction;
+	    goto FPU_fwait_done;
 	}
 #ifdef PARANOID
-      RE_ENTRANT_CHECK_OFF;
-      printk("FPU emulator: Unknown prefix byte 0x%02x\n", code & 0xff);
-      RE_ENTRANT_CHECK_ON;
-      EXCEPTION(EX_INTERNAL|0x126);
-      FPU_EIP++;
-      goto do_the_FPU_interrupt;
+      EXCEPTION(EX_INTERNAL|0x128);
+      math_abort(FPU_info,SIGILL);
 #endif PARANOID
     }
 
+  RE_ENTRANT_CHECK_OFF;
+  FPU_code_verify_area(1);
+  FPU_modrm = get_fs_byte((unsigned short *) FPU_EIP);
+  RE_ENTRANT_CHECK_ON;
+  FPU_EIP++;
+
   if (partial_status & SW_Summary)
     {
       /* Ignore the error for now if the current instruction is a no-wait
 	 control instruction */
       /* The 80486 manual contradicts itself on this topic,
-	 so I use the following list of such instructions until
-	 I can check on a real 80486:
+	 but a real 80486 uses the following instructions:
 	 fninit, fnstenv, fnsave, fnstsw, fnstenv, fnclex.
        */
+      unsigned short code = (FPU_modrm << 8) | byte1;
       if ( ! ( (((code & 0xf803) == 0xe003) ||    /* fnclex, fninit, fnstsw */
 		(((code & 0x3003) == 0x3001) &&   /* fnsave, fnstcw, fnstenv,
 						     fnstsw */
@@ -290,32 +280,17 @@ asmlinkage void math_emulate(long arg)
 	}
     }
 
-  FPU_entry_eip = FPU_ORIG_EIP = FPU_EIP;
+  FPU_entry_eip = FPU_ORIG_EIP;
 
-  {
-    unsigned short swapped_code = code;
-    bswapw(swapped_code);
-    FPU_entry_op_cs = (swapped_code << 16) | (FPU_CS & 0xffff) ;
-  }
-
-  if ( (code & 0xff) == OP_SIZE_PREFIX )
-    {
-      FPU_EIP++;
-      RE_ENTRANT_CHECK_OFF;
-      FPU_code_verify_area(1);
-      code = get_fs_word((unsigned short *) FPU_EIP);
-      RE_ENTRANT_CHECK_ON;
-    }
-  FPU_EIP += 2;
+  FPU_entry_op_cs = (byte1 << 24) | (FPU_modrm << 16) | (FPU_CS & 0xffff) ;
 
-  FPU_modrm = code >> 8;
   FPU_rm = FPU_modrm & 7;
 
   if ( FPU_modrm < 0300 )
     {
       /* All of these instructions use the mod/rm byte to get a data address */
-      get_address(FPU_modrm);
-      if ( !(code & 1) )
+      get_address(FPU_modrm, override);
+      if ( !(byte1 & 1) )
 	{
 	  unsigned short status1 = partial_status;
 	  FPU_st0_ptr = &st(0);
@@ -325,19 +300,19 @@ asmlinkage void math_emulate(long arg)
 	  if ( NOT_EMPTY_0 )
 	    {
 	      unmasked = 0;  /* Do this here to stop compiler warnings. */
-	      switch ( (code >> 1) & 3 )
+	      switch ( (byte1 >> 1) & 3 )
 		{
 		case 0:
-		  unmasked = reg_load_single();
+		  unmasked = reg_load_single(override);
 		  break;
 		case 1:
-		  reg_load_int32();
+		  reg_load_int32(override);
 		  break;
 		case 2:
-		  unmasked = reg_load_double();
+		  unmasked = reg_load_double(override);
 		  break;
 		case 3:
-		  reg_load_int16();
+		  reg_load_int16(override);
 		  break;
 		}
 	      
@@ -465,7 +440,7 @@ asmlinkage void math_emulate(long arg)
 	}
       else
 	{
-	  load_store_instr(((FPU_modrm & 0x38) | (code & 6)) >> 1);
+	  load_store_instr(((FPU_modrm & 0x38) | (byte1 & 6)) >> 1, override);
 	}
 
     reg_mem_instr_done:
@@ -478,7 +453,7 @@ asmlinkage void math_emulate(long arg)
   else
     {
       /* None of these instructions access user memory */
-      unsigned char instr_index = (FPU_modrm & 0x38) | (code & 7);
+      unsigned char instr_index = (FPU_modrm & 0x38) | (byte1 & 7);
 
 #ifdef PECULIAR_486
       /* This is supposed to be undefined, but a real 80486 seems
@@ -523,7 +498,7 @@ asmlinkage void math_emulate(long arg)
 	case _PUSH_:     /* Only used by the fld st(i) instruction */
 	  break;
 	case _null_:
-	  Un_impl();
+	  FPU_illegal();
 	  goto FPU_instruction_done;
 	default:
 	  EXCEPTION(EX_INTERNAL|0x111);
@@ -534,14 +509,6 @@ asmlinkage void math_emulate(long arg)
 
 FPU_instruction_done:
 
-#ifdef DEBUG
-  { /* !!!!!!!!!!! */
-    static unsigned int count = 0;
-    if ( (++count % 10000) == 0 )
-	printk("%d FP instr., current=0x%04x\n", count, code);
-  } /* !!!!!!!!!!! */
-#endif DEBUG
-
   ip_offset = FPU_entry_eip;
   cs_selector = FPU_entry_op_cs;
   data_operand_offset = (unsigned long)FPU_data_address;
@@ -559,13 +526,8 @@ asmlinkage void math_emulate(long arg)
 
   if (FPU_lookahead && !need_resched)
     {
-      unsigned char next;
-
-      RE_ENTRANT_CHECK_OFF;
-      FPU_code_verify_area(1);
-      next = get_fs_byte((unsigned char *) FPU_EIP);
-      RE_ENTRANT_CHECK_ON;
-      if ( valid_prefix(next) )
+      FPU_ORIG_EIP = FPU_EIP;
+      if ( valid_prefix(&byte1, &override) )
 	goto do_another_FPU_instruction;
     }
 
@@ -573,27 +535,54 @@ asmlinkage void math_emulate(long arg)
 }
 
 
-/* This function is not yet complete. To properly handle all prefix
-   bytes, it will be necessary to change all emulator code which
-   accesses user address space. Access to separate segments is
+/* Support for prefix bytes is not yet complete. To properly handle
+   all prefix bytes, further changes are needed in the emulator code
+   which accesses user address space. Access to separate segments is
    important for msdos emulation. */
-static int valid_prefix(unsigned char byte)
+static int valid_prefix(unsigned char *Byte, overrides *override)
 {
+  unsigned char byte;
   unsigned long ip = FPU_EIP;
 
+  *override = (overrides) { 0, PREFIX_DS };       /* defaults */
+
+  RE_ENTRANT_CHECK_OFF;
+  FPU_code_verify_area(1);
+  byte = get_fs_byte((unsigned char *) FPU_EIP);
+  RE_ENTRANT_CHECK_ON;
+
   while ( 1 )
     {
       switch ( byte )
 	{
 	case ADDR_SIZE_PREFIX:
-	case PREFIX_DS:   /* Redundant */
+	  override->address_size = ADDR_SIZE_PREFIX;
+	  goto do_next_byte;
 	case PREFIX_CS:
+	  override->segment = PREFIX_CS;
+	  goto do_next_byte;
 	case PREFIX_ES:
+	  override->segment = PREFIX_ES;
+	  goto do_next_byte;
 	case PREFIX_SS:
+	  override->segment = PREFIX_SS;
+	  goto do_next_byte;
 	case PREFIX_FS:
+	  override->segment = PREFIX_FS;
+	  goto do_next_byte;
 	case PREFIX_GS:
+	  override->segment = PREFIX_GS;
+	  goto do_next_byte;
+
+	case PREFIX_DS:   /* Redundant unless preceded by another override. */
+	  override->segment = PREFIX_DS;
 
+	  /* rep.. prefixes have no meaning for FPU instructions */
+	case PREFIX_LOCK:
+	case PREFIX_REPE:
+	case PREFIX_REPNE:
 	case OP_SIZE_PREFIX:  /* Used often by gcc, but has no effect. */
+	do_next_byte:
 	  FPU_EIP++;
 	  RE_ENTRANT_CHECK_OFF;
 	  FPU_code_verify_area(1);
@@ -601,10 +590,14 @@ static int valid_prefix(unsigned char byte)
 	  RE_ENTRANT_CHECK_ON;
 	  break;
 	case FWAIT_OPCODE:
+	  *Byte = byte;
 	  return 1;
 	default:
 	  if ( (byte & 0xf8) == 0xd8 )
-	    return 1;
+	    {
+	      *Byte = byte;
+	      return 1;
+	    }
 	  else
 	    {
 	      FPU_EIP = ip;

drivers/FPU-emu/fpu_etc.c

@@ -3,7 +3,7 @@
  |                                                                           |
  | Implement a few FPU instructions.                                         |
  |                                                                           |
- | Copyright (C) 1992,1993                                                   |
+ | Copyright (C) 1992,1993,1994                                              |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  |                                                                           |
@@ -118,7 +118,7 @@ static void fxam(void)
 }
 
 static FUNC const fp_etc_table[] = {
-  fchs, fabs, Un_impl, Un_impl, ftst_, fxam, Un_impl, Un_impl
+  fchs, fabs, FPU_illegal, FPU_illegal, ftst_, fxam, FPU_illegal, FPU_illegal
 };
 
 void fp_etc()

drivers/FPU-emu/fpu_proto.h

 /* errors.c */
 extern void Un_impl(void);
+extern void FPU_illegal(void);
 extern void emu_printall(void);
 extern void stack_overflow(void);
 extern void stack_underflow(void);
@@ -62,10 +63,10 @@ extern void trig_a(void);
 extern void trig_b(void);
 
 /* get_address.c */
-extern void get_address(unsigned char FPU_modrm);
+extern void get_address(unsigned char FPU_modrm, overrides override);
 
 /* load_store.c */
-extern void load_store_instr(char type);
+extern void load_store_instr(char type, overrides override);
 
 /* poly_2xm1.c */
 extern int poly_2xm1(FPU_REG const *arg, FPU_REG *result);
@@ -104,20 +105,20 @@ extern void fucompp(void);
 extern void fconst(void);
 
 /* reg_ld_str.c */
-extern int reg_load_extended(void);
-extern int reg_load_double(void);
-extern int reg_load_single(void);
-extern void reg_load_int64(void);
-extern void reg_load_int32(void);
-extern void reg_load_int16(void);
-extern void reg_load_bcd(void);
-extern int reg_store_extended(void);
-extern int reg_store_double(void);
-extern int reg_store_single(void);
-extern int reg_store_int64(void);
-extern int reg_store_int32(void);
-extern int reg_store_int16(void);
-extern int reg_store_bcd(void);
+extern int reg_load_extended(overrides override);
+extern int reg_load_double(overrides override);
+extern int reg_load_single(overrides override);
+extern void reg_load_int64(overrides override);
+extern void reg_load_int32(overrides override);
+extern void reg_load_int16(overrides override);
+extern void reg_load_bcd(overrides override);
+extern int reg_store_extended(overrides override);
+extern int reg_store_double(overrides override);
+extern int reg_store_single(overrides override);
+extern int reg_store_int64(overrides override);
+extern int reg_store_int32(overrides override);
+extern int reg_store_int16(overrides override);
+extern int reg_store_bcd(overrides override);
 extern int round_to_int(FPU_REG *r);
 extern char *fldenv(void);
 extern void frstor(void);

drivers/FPU-emu/get_address.c

@@ -112,7 +112,7 @@ static void *sib(int mod)
 
 */
 
-void get_address(unsigned char FPU_modrm)
+void get_address(unsigned char FPU_modrm, overrides override)
 {
   unsigned char mod;
   long *cpu_reg_ptr;
@@ -137,12 +137,21 @@ void get_address(unsigned char FPU_modrm)
     case 0:
       if (FPU_rm == 5)
 	{
-	  /* Special case: disp32 */
+	  /* Special case: disp16 or disp32 */
 	  RE_ENTRANT_CHECK_OFF;
-	  FPU_code_verify_area(4);
-	  offset = get_fs_long((unsigned long *) FPU_EIP);
+	  if ( override.address_size == ADDR_SIZE_PREFIX )
+	    {
+	      FPU_code_verify_area(2);
+	      offset = get_fs_word((unsigned short *) FPU_EIP);
+	      FPU_EIP += 2;
+	    }
+	  else
+	    {
+	      FPU_code_verify_area(4);
+	      offset = get_fs_long((unsigned long *) FPU_EIP);
+	      FPU_EIP += 4;
+	    }
 	  RE_ENTRANT_CHECK_ON;
-	  FPU_EIP += 4;
 	  FPU_data_address = (void *) offset;
 	  return;
 	}
@@ -161,12 +170,21 @@ void get_address(unsigned char FPU_modrm)
       FPU_EIP++;
       break;
     case 2:
-      /* 32 bit displacement */
+      /* 16 or 32 bit displacement */
       RE_ENTRANT_CHECK_OFF;
-      FPU_code_verify_area(4);
-      offset = (signed) get_fs_long((unsigned long *) FPU_EIP);
+      if ( override.address_size == ADDR_SIZE_PREFIX )
+	{
+	  FPU_code_verify_area(2);
+	  offset = (signed) get_fs_word((unsigned short *) FPU_EIP);
+	  FPU_EIP += 2;
+	}
+      else
+	{
+	  FPU_code_verify_area(4);
+	  offset = (signed) get_fs_long((unsigned long *) FPU_EIP);
+	  FPU_EIP += 4;
+	}
       RE_ENTRANT_CHECK_ON;
-      FPU_EIP += 4;
       break;
     case 3:
       /* Not legal for the FPU */
@@ -174,4 +192,6 @@ void get_address(unsigned char FPU_modrm)
     }
 
   FPU_data_address = offset + (char *)*cpu_reg_ptr;
+  if ( override.address_size == ADDR_SIZE_PREFIX )
+    FPU_data_address = (void *)((long)FPU_data_address & 0xffff);
 }

drivers/FPU-emu/load_store.c

@@ -46,7 +46,7 @@ static unsigned char const type_table[32] = {
   _NONE_, _REG0_, _NONE_, _REG0_
   };
 
-void load_store_instr(char type)
+void load_store_instr(char type, overrides override)
 {
   FPU_REG *pop_ptr;  /* We need a version of FPU_st0_ptr which won't
 			change if the emulator is re-entered. */
@@ -72,7 +72,7 @@ void load_store_instr(char type)
       }
       break;
     case _null_:
-      Un_impl();
+      FPU_illegal();
       return;
 #ifdef PARANOID
     default:
@@ -85,7 +85,7 @@ switch ( type )
   {
   case 000:       /* fld m32real */
     clear_C1();
-    reg_load_single();
+    reg_load_single(override);
     if ( (FPU_loaded_data.tag == TW_NaN) &&
 	real_2op_NaN(&FPU_loaded_data, &FPU_loaded_data, &FPU_loaded_data) )
       {
@@ -96,12 +96,12 @@ switch ( type )
     break;
   case 001:      /* fild m32int */
     clear_C1();
-    reg_load_int32();
+    reg_load_int32(override);
     reg_move(&FPU_loaded_data, pop_ptr);
     break;
   case 002:      /* fld m64real */
     clear_C1();
-    reg_load_double();
+    reg_load_double(override);
     if ( (FPU_loaded_data.tag == TW_NaN) &&
 	real_2op_NaN(&FPU_loaded_data, &FPU_loaded_data, &FPU_loaded_data) )
       {
@@ -112,46 +112,46 @@ switch ( type )
     break;
   case 003:      /* fild m16int */
     clear_C1();
-    reg_load_int16();
+    reg_load_int16(override);
     reg_move(&FPU_loaded_data, pop_ptr);
     break;
   case 010:      /* fst m32real */
     clear_C1();
-    reg_store_single();
+    reg_store_single(override);
     break;
   case 011:      /* fist m32int */
     clear_C1();
-    reg_store_int32();
+    reg_store_int32(override);
     break;
   case 012:     /* fst m64real */
     clear_C1();
-    reg_store_double();
+    reg_store_double(override);
     break;
   case 013:     /* fist m16int */
     clear_C1();
-    reg_store_int16();
+    reg_store_int16(override);
     break;
   case 014:     /* fstp m32real */
     clear_C1();
-    if ( reg_store_single() )
+    if ( reg_store_single(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;
   case 015:     /* fistp m32int */
     clear_C1();
-    if ( reg_store_int32() )
+    if ( reg_store_int32(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;
   case 016:     /* fstp m64real */
     clear_C1();
-    if ( reg_store_double() )
+    if ( reg_store_double(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;
   case 017:     /* fistp m16int */
     clear_C1();
-    if ( reg_store_int16() )
+    if ( reg_store_int16(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;
@@ -163,7 +163,7 @@ switch ( type )
     break;
   case 023:     /* fbld m80dec */
     clear_C1();
-    reg_load_bcd();
+    reg_load_bcd(override);
     reg_move(&FPU_loaded_data, pop_ptr);
     break;
   case 024:     /* fldcw */
@@ -183,12 +183,12 @@ switch ( type )
     break;
   case 025:      /* fld m80real */
     clear_C1();
-    reg_load_extended();
+    reg_load_extended(override);
     reg_move(&FPU_loaded_data, pop_ptr);
     break;
   case 027:      /* fild m64int */
     clear_C1();
-    reg_load_int64();
+    reg_load_int64(override);
     reg_move(&FPU_loaded_data, pop_ptr);
     break;
   case 030:     /* fstenv  m14/28byte */
@@ -201,7 +201,7 @@ switch ( type )
     break;
   case 033:      /* fbstp m80dec */
     clear_C1();
-    if ( reg_store_bcd() )
+    if ( reg_store_bcd(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;
@@ -215,7 +215,7 @@ switch ( type )
     break;
   case 035:      /* fstp m80real */
     clear_C1();
-    if ( reg_store_extended() )
+    if ( reg_store_extended(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;
@@ -229,7 +229,7 @@ switch ( type )
     break;
   case 037:      /* fistp m64int */
     clear_C1();
-    if ( reg_store_int64() )
+    if ( reg_store_int64(override) )
       pop_0();  /* pop only if the number was actually stored
 		 (see the 80486 manual p16-28) */
     break;

drivers/FPU-emu/reg_compare.c

@@ -3,7 +3,7 @@
  |                                                                           |
  | Compare two floating point registers                                      |
  |                                                                           |
- | Copyright (C) 1992,1993                                                   |
+ | Copyright (C) 1992,1993,1994                                              |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  |                                                                           |
@@ -336,7 +336,7 @@ void fcompp()
   /* fcompp */
   if (FPU_rm != 1)
     {
-      Un_impl();
+      FPU_illegal();
       return;
     }
   if ( !compare_st_st(1) )
@@ -375,5 +375,5 @@ void fucompp()
 	}
     }
   else
-    Un_impl();
+    FPU_illegal();
 }

drivers/FPU-emu/reg_constant.c

@@ -3,7 +3,7 @@
  |                                                                           |
  | All of the constant FPU_REGs                                              |
  |                                                                           |
- | Copyright (C) 1992,1993                                                   |
+ | Copyright (C) 1992,1993,1994                                              |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  |                                                                           |
@@ -107,7 +107,7 @@ static void fldz(void)
 }
 
 static FUNC constants_table[] = {
-  fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, Un_impl
+  fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, FPU_illegal
 };
 
 void fconst(void)

drivers/FPU-emu/reg_div.S

@@ -4,7 +4,7 @@
  |                                                                           |
  | Divide one FPU_REG by another and put the result in a destination FPU_REG.|
  |                                                                           |
- | Copyright (C) 1992,1993                                                   |
+ | Copyright (C) 1992,1993,1994                                              |
  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
  |                                                                           |

drivers/FPU-emu/reg_ld_str.c

@@ -44,7 +44,7 @@ FPU_REG FPU_loaded_data;
 
 
 /* Get a long double from user memory */
-int reg_load_extended(void)
+int reg_load_extended(overrides override)
 {
   long double *s = (long double *)FPU_data_address;
   unsigned long sigl, sigh, exp;
@@ -145,7 +145,7 @@ int reg_load_extended(void)
 
 
 /* Get a double from user memory */
-int reg_load_double(void)
+int reg_load_double(overrides override)
 {
   double *dfloat = (double *)FPU_data_address;
   int exp;
@@ -223,7 +223,7 @@ int reg_load_double(void)
 
 
 /* Get a float from user memory */
-int reg_load_single(void)
+int reg_load_single(overrides override)
 {
   float *single = (float *)FPU_data_address;
   unsigned m32;
@@ -292,7 +292,7 @@ int reg_load_single(void)
 
 
 /* Get a long long from user memory */
-void reg_load_int64(void)
+void reg_load_int64(overrides override)
 {
   long long *_s = (long long *)FPU_data_address;
   int e;
@@ -324,7 +324,7 @@ void reg_load_int64(void)
 
 
 /* Get a long from user memory */
-void reg_load_int32(void)
+void reg_load_int32(overrides override)
 {
   long *_s = (long *)FPU_data_address;
   long s;
@@ -356,7 +356,7 @@ void reg_load_int32(void)
 
 
 /* Get a short from user memory */
-void reg_load_int16(void)
+void reg_load_int16(overrides override)
 {
   short *_s = (short *)FPU_data_address;
   int s, e;
@@ -389,7 +389,7 @@ void reg_load_int16(void)
 
 
 /* Get a packed bcd array from user memory */
-void reg_load_bcd(void)
+void reg_load_bcd(overrides override)
 {
   char *s = (char *)FPU_data_address;
   int pos;
@@ -436,7 +436,7 @@ void reg_load_bcd(void)
 /*===========================================================================*/
 
 /* Put a long double into user memory */
-int reg_store_extended(void)
+int reg_store_extended(overrides override)
 {
   /*
     The only exception raised by an attempt to store to an
@@ -475,7 +475,7 @@ int reg_store_extended(void)
 
 
 /* Put a double into user memory */
-int reg_store_double(void)
+int reg_store_double(overrides override)
 {
   double *dfloat = (double *)FPU_data_address;
   unsigned long l[2];
@@ -670,7 +670,7 @@ int reg_store_double(void)
 
 
 /* Put a float into user memory */
-int reg_store_single(void)
+int reg_store_single(overrides override)
 {
   float *single = (float *)FPU_data_address;
   long templ;
@@ -859,7 +859,7 @@ int reg_store_single(void)
 
 
 /* Put a long long into user memory */
-int reg_store_int64(void)
+int reg_store_int64(overrides override)
 {
   long long *d = (long long *)FPU_data_address;
   FPU_REG t;
@@ -918,7 +918,7 @@ int reg_store_int64(void)
 
 
 /* Put a long into user memory */
-int reg_store_int32(void)
+int reg_store_int32(overrides override)
 {
   long *d = (long *)FPU_data_address;
   FPU_REG t;
@@ -972,7 +972,7 @@ int reg_store_int32(void)
 
 
 /* Put a short into user memory */
-int reg_store_int16(void)
+int reg_store_int16(overrides override)
 {
   short *d = (short *)FPU_data_address;
   FPU_REG t;
@@ -1026,7 +1026,7 @@ int reg_store_int16(void)
 
 
 /* Put a packed bcd array into user memory */
-int reg_store_bcd(void)
+int reg_store_bcd(overrides override)
 {
   char *d = (char *)FPU_data_address;
   FPU_REG t;
@@ -1240,7 +1240,7 @@ void frstor(void)
     {
       /* Load each register. */
       FPU_data_address = (void *)(s+i*10);
-      reg_load_extended();
+      reg_load_extended((overrides){0,0});
       stnr = (i+top) & 7;
       tag = regs[stnr].tag;   /* Derived from the loaded tag word. */
       reg_move(&FPU_loaded_data, &regs[stnr]);

drivers/FPU-emu/version.h

@@ -9,5 +9,5 @@
  |                                                                           |
  +---------------------------------------------------------------------------*/
 
-#define FPU_VERSION "wm-FPU-emu version Beta 1.8"
+#define FPU_VERSION "wm-FPU-emu version Beta 1.9"
 

drivers/char/console.c

@@ -624,8 +624,7 @@ static void update_attr(int currcons)
 			attr = (attr & 0xf0) | 0x08;
 	}
 	if (decscnm)
-		video_erase_char = ((color & 0x88) | (((color >> 4) |
-			(color << 4)) & 0x77) << 8) | ' ';
+		video_erase_char = (((color & 0x88) | (((color >> 4) | (color << 4)) & 0x77)) << 8) | ' ';
 	else
 		video_erase_char = (color << 8) | ' ';
 }

fs/ext2/balloc.c

@@ -267,7 +267,8 @@ void ext2_free_blocks (struct super_block * sb, unsigned long block,
 	if (block < es->s_first_data_block || 
 	    (block + count) > es->s_blocks_count) {
 		ext2_error (sb, "ext2_free_blocks",
-			    "Freeing blocks not in datazone");
+			    "Freeing blocks not in datazone\n"
+			    "block = %lu, count = %lu", block, count);
 		unlock_super (sb);
 		return;
 	}
@@ -303,11 +304,13 @@ void ext2_free_blocks (struct super_block * sb, unsigned long block,
 			ext2_warning (sb, "ext2_free_blocks",
 				      "bit already cleared for block %lu", 
 				      block);
+		else {
+			gdp->bg_free_blocks_count++;
+			es->s_free_blocks_count++;
+		}
 	}
 	
-	gdp->bg_free_blocks_count += count;
 	bh2->b_dirt = 1;
-	es->s_free_blocks_count += count;
 	sb->u.ext2_sb.s_sbh->b_dirt = 1;
 
 	bh->b_dirt = 1;
@@ -355,7 +358,12 @@ int ext2_new_block (struct super_block * sb, unsigned long goal,
 	}
 
 	ext2_debug ("goal=%lu.\n", goal);
-	
+
+	if (goal < es->s_first_data_block || goal >= es->s_blocks_count) {
+		ext2_warning (sb, "ext2_new_block",
+			      "Goal out of bounds: %lu", goal);
+		goal = es->s_first_data_block;
+	}
 repeat:
 	/*
 	 * First, test whether the goal block is free.

fs/proc/array.c

@@ -88,10 +88,10 @@ static int get_loadavg(char * buffer)
 
 static int get_kstat(char * buffer)
 {
-        return sprintf(buffer,	"cpu  %u,%u,%u,%lu\n"
-        			"disk %u,%u,%u,%u\n"
-        			"page %u,%u\n"
-        			"swap %u,%u\n"
+        return sprintf(buffer,	"cpu  %u %u %u %lu\n"
+        			"disk %u %u %u %u\n"
+        			"page %u %u\n"
+        			"swap %u %u\n"
         			"intr %u\n"
         			"ctxt %u\n"
         			"btime %lu\n",

fs/proc/link.c

@@ -50,6 +50,10 @@ static int proc_follow_link(struct inode * dir, struct inode * inode,
 		iput(dir);
 	if (!inode)
 		return -ENOENT;
+	if (!permission(inode, MAY_EXEC)) {
+		iput(inode);
+		return -EACCES;
+	}
 	ino = inode->i_ino;
 	pid = ino >> 16;
 	ino &= 0x0000ffff;

kernel/traps.c

@@ -167,14 +167,14 @@ void math_error(void)
 	}
 	env = &last_task_used_math->tss.i387.hard;
 	send_sig(SIGFPE, last_task_used_math, 1);
-	current->tss.trap_no = 16;
-	current->tss.error_code = 0;
+	last_task_used_math->tss.trap_no = 16;
+	last_task_used_math->tss.error_code = 0;
 	__asm__ __volatile__("fnsave %0":"=m" (*env));
 	last_task_used_math = NULL;
 	stts();
 	env->fcs = (env->swd & 0x0000ffff) | (env->fcs & 0xffff0000);
 	env->fos = env->twd;
-	env->swd &= 0xffff0000;
+	env->swd &= 0xffff3800;
 	env->twd = 0xffffffff;
 }
 

net/inet/arp.c

@@ -251,19 +251,14 @@ arp_send_q(void)
 
 
 /* Create and send our response to an ARP request. */
-
-/*
- *	We are now a bit smarter. We know the old buffer must be big enough
- *	so why allocate a new one for the reply ?
- */
- 
-static int arp_response(struct sk_buff *skb,struct arphdr *arp1, struct device *dev,  int addrtype)
+static int
+arp_response(struct arphdr *arp1, struct device *dev,  int addrtype)
 {
   struct arphdr *arp2;
+  struct sk_buff *skb;
   unsigned long src, dst;
   unsigned char *ptr1, *ptr2;
   int hlen;
-  int len;
   struct arp_table *apt = NULL;/* =NULL otherwise the compiler gives warnings */
 
   /* Decode the source (REQUEST) message. */
@@ -275,28 +270,24 @@ static int arp_response(struct sk_buff *skb,struct arphdr *arp1, struct device *
   {
   	apt=arp_lookup_proxy(dst);
   	if(apt==NULL)
-  	{
-  		kfree_skb(skb,FREE_READ);
   		return(1);
-  	}
   }
 
-  skb->h.raw=skb->data;
-  skb->len+=dev->hard_header_len;	/* Grow the packet back to its original form */
-
-  /* Can't check for exceeding the size - some people pad. */
-  len= sizeof(struct arphdr) + (2 * arp1->ar_hln) + (2 * arp1->ar_pln) + dev->hard_header_len;
-  if(len>skb->len)
-  {
-  	printk("Received runt ARP request!\n");
-  	kfree_skb(skb,FREE_READ);
-  	return 1;
+  /* Get some mem and initialize it for the return trip. */
+  skb = alloc_skb(sizeof(struct sk_buff) +
+  		sizeof(struct arphdr) +
+		(2 * arp1->ar_hln) + (2 * arp1->ar_pln) +
+		dev->hard_header_len, GFP_ATOMIC);
+  if (skb == NULL) {
+	printk("ARP: no memory available for ARP REPLY!\n");
+	return(1);
   }
 
-  skb->len      = len;
-
+  skb->mem_addr = skb;
+  skb->len      = sizeof(struct arphdr) + (2 * arp1->ar_hln) + 
+		  (2 * arp1->ar_pln) + dev->hard_header_len;
+  skb->mem_len  = sizeof(struct sk_buff) + skb->len;
   hlen = dev->hard_header(skb->data, dev, ETH_P_ARP, src, dst, skb->len);
-
   if (hlen < 0) {
 	printk("ARP: cannot create HW frame header for REPLY !\n");
 	kfree_skb(skb, FREE_WRITE);
@@ -587,7 +578,8 @@ arp_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
    * Yes, it is for us.
    * Allocate, fill in and send an ARP REPLY packet.
    */
-  ret = arp_response(skb,arp, dev, addr_hint);
+  ret = arp_response(arp, dev, addr_hint);
+  kfree_skb(skb, FREE_READ);
   return(ret);
 }
 
@@ -616,12 +608,14 @@ arp_send(unsigned long paddr, struct device *dev, unsigned long saddr)
   
   /* Fill in the request. */
   skb->sk = NULL;
+  skb->mem_addr = skb;
   skb->len = sizeof(struct arphdr) +
 	     dev->hard_header_len + (2 * dev->addr_len) + 8;
+  skb->mem_len = sizeof(struct sk_buff) + skb->len;
   skb->arp = 1;
   skb->dev = dev;
-  skb->free = 1;
   skb->next = NULL;
+  skb->free = 1;
   tmp = dev->hard_header(skb->data, dev, ETH_P_ARP, 0, saddr, skb->len);
   if (tmp < 0) {
 	kfree_skb(skb,FREE_WRITE);

net/inet/skbuff.c

@@ -423,8 +423,8 @@ void kfree_skb(struct sk_buff *skb, int rw)
  *	fields and also do memory statistics to find all the [BEEP] leaks.
  */
 
- struct sk_buff *alloc_skb(unsigned int size,int priority)
- {
+struct sk_buff *alloc_skb(unsigned int size,int priority)
+{
 	struct sk_buff *skb=(struct sk_buff *)kmalloc(size,priority);
 	if(skb==NULL)
 		return NULL;
@@ -440,7 +440,7 @@ void kfree_skb(struct sk_buff *skb, int rw)
 	skb->magic_debug_cookie=SK_GOOD_SKB;
 	skb->users=0;
 	return skb;
- }
+}
 
 /*
  *	Free an skbuff by memory

net/inet/tcp.c

@@ -634,7 +634,7 @@ static void tcp_send_skb(struct sock *sk, struct sk_buff *skb)
 		skb->next = NULL;
 		skb->magic = TCP_WRITE_QUEUE_MAGIC;
 		if (sk->wback == NULL) {
-			sk->wfront=skb;
+			sk->wfront = skb;
 		} else {
 			sk->wback->next = skb;
 		}
@@ -685,7 +685,7 @@ void tcp_enqueue_partial(struct sk_buff * skb, struct sock * sk)
 	if (tmp)
 		del_timer(&sk->partial_timer);
 	sk->partial = skb;
-	sk->partial_timer.expires = 5*HZ;
+	sk->partial_timer.expires = HZ;
 	sk->partial_timer.function = (void (*)(unsigned long)) tcp_send_partial;
 	sk->partial_timer.data = (unsigned long) sk;
 	add_timer(&sk->partial_timer);
@@ -2182,7 +2182,7 @@ tcp_close(struct sock *sk, int timeout)
 			reset_timer(sk, TIME_WRITE, sk->rto);
 			buff->next = NULL;
 			if (sk->wback == NULL) {
-				sk->wfront=buff;
+				sk->wfront = buff;
 			} else {
 				sk->wback->next = buff;
 			}
@@ -2224,7 +2224,7 @@ tcp_write_xmit(struct sock *sk)
         && sk->packets_out < sk->cong_window) {
 		skb = sk->wfront;
 		IS_SKB(skb);
-		sk->wfront =(struct sk_buff *)skb->next;
+		sk->wfront = skb->next;
 		if (sk->wfront == NULL) sk->wback = NULL;
 		skb->next = NULL;
 		if (skb->magic != TCP_WRITE_QUEUE_MAGIC) {