TMF Hg

fixed timing on OSes that set a minimum time for sleeps (previously the main loop code assumed no minimum sleep time; the new version uses longer sleeps less frequently) default tip

  • Sat, 19 Apr 2014 02:19:39 -0600
  • by andrew@localhost [Sat, 19 Apr 2014 02:19:39 -0600] rev 152
  • fixed timing on OSes that set a minimum time for sleeps (previously the main loop code assumed no minimum sleep time; the new version uses longer sleeps less frequently)

added RTC emulation (attempts to set the date are ignored, and the year is currently hardcoded to 1987 because UNIX PC SysV has a few Y2K bugs)

  • Fri, 18 Apr 2014 01:34:20 -0600
  • by andrew@localhost [Fri, 18 Apr 2014 01:34:20 -0600] rev 151
  • added RTC emulation (attempts to set the date are ignored, and the year is currently hardcoded to 1987 because UNIX PC SysV has a few Y2K bugs)

treat all DMA reads/writes as kernel mode (previously it would depend on whether the processor happens to be in user mode or kernel mode when the DMA completes, which is totally incorrect); handle 32-bit accesses that straddle page boundaries properly (all 32-bit accesses are now split into two 16-bit accesses); allow reads to the entire zero page, rather than just address 0

  • Fri, 18 Apr 2014 01:26:01 -0600
  • by andrew@localhost [Fri, 18 Apr 2014 01:26:01 -0600] rev 150
  • treat all DMA reads/writes as kernel mode (previously it would depend on whether the processor happens to be in user mode or kernel mode when the DMA completes, which is totally incorrect); handle 32-bit accesses that straddle page boundaries properly (all 32-bit accesses are now split into two 16-bit accesses); allow reads to the entire zero page, rather than just address 0

disabled seek delay on WD2010 (Unix seems to work fine without it)

  • Thu, 17 Apr 2014 01:58:05 -0600
  • by andrew@localhost [Thu, 17 Apr 2014 01:58:05 -0600] rev 149
  • disabled seek delay on WD2010 (Unix seems to work fine without it)

ignore out-of-range addresses on low-level format commands (s4diag formats once sector past the end of each track)

  • Thu, 17 Apr 2014 01:50:41 -0600
  • by andrew@localhost [Thu, 17 Apr 2014 01:50:41 -0600] rev 148
  • ignore out-of-range addresses on low-level format commands (s4diag formats once sector past the end of each track)

fixed bus error handling for real this time (save registers before every instruction and push the saved registers if a bus error occurs, since the instruction may have changed registers before the bus error, and also stop the instruction immediately with longjmp so it won't change memory after the bus error)

  • Wed, 16 Apr 2014 02:20:43 -0600
  • by andrew@localhost [Wed, 16 Apr 2014 02:20:43 -0600] rev 147
  • fixed bus error handling for real this time (save registers before every instruction and push the saved registers if a bus error occurs, since the instruction may have changed registers before the bus error, and also stop the instruction immediately with longjmp so it won't change memory after the bus error)

    This isn't actually what a real 68k does, but it is a good enough approximation. A real 68k will jump back into the middle of the faulted instruction and resume it from the memory access that faulted as opposed to restarting from the beginning like this CPU emulation does. It would be a lot harder to do that with the way this CPU library is designed. Newer versions of MESS basically do the same thing (they use a newer version of this library).

added keyboard mappings for ENTER, CANCL, and EXIT

  • Wed, 16 Apr 2014 02:07:24 -0600
  • by andrew@localhost [Wed, 16 Apr 2014 02:07:24 -0600] rev 146
  • added keyboard mappings for ENTER, CANCL, and EXIT

Code clean up experimental_memory_mapper_v2

  • Tue, 21 May 2013 22:48:32 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Tue, 21 May 2013 22:48:32 +0100] rev 145
  • Code clean up

    * Tighten optimisation and warning options to find more potential issues
    * Remove unused variable in keyboard code
    * Display error message if ROMs fail to load
    * Fix format string bugs in WD2010

Don't set PS1 if there is a level-7 interrupt or bus error experimental_memory_mapper_v2

  • Fri, 12 Apr 2013 16:26:25 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Fri, 12 Apr 2013 16:26:25 +0100] rev 144
  • Don't set PS1 if there is a level-7 interrupt or bus error

    PS1 should only be set if the page was originally present (PS1 or PS0 set). If
    PS0 and PS1 are clear (page not present) then do NOT set PS1.

    Once again the TRM is blatantly and spectacularly wrong...

Flush stderr after printing debug messages experimental_memory_mapper_v2

  • Fri, 12 Apr 2013 12:37:34 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Fri, 12 Apr 2013 12:37:34 +0100] rev 143
  • Flush stderr after printing debug messages

Make the page table volatile (it may change behind gcc's back) experimental_memory_mapper_v2

  • Fri, 12 Apr 2013 12:37:13 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Fri, 12 Apr 2013 12:37:13 +0100] rev 142
  • Make the page table volatile (it may change behind gcc's back)

Make mapper debug logic more verbose (but disable by default) experimental_memory_mapper_v2

  • Fri, 12 Apr 2013 12:36:28 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Fri, 12 Apr 2013 12:36:28 +0100] rev 141
  • Make mapper debug logic more verbose (but disable by default)

Fix read-after-write logic experimental_memory_mapper_v2

  • Fri, 12 Apr 2013 12:34:32 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Fri, 12 Apr 2013 12:34:32 +0100] rev 140
  • Fix read-after-write logic

    In some cases (notably reading from a page after having written to it), the
    mapper may change the pagestate from "accessed and written" ("dirty"; PS0,PS1)
    to "accessed but not written" (clean; PS1,!PS0). This should never, ever, EVER
    happen. Once a page is dirty, it remains so until the 68k clears the DIRTY
    bit.

    Once again, this wonderful bit of logic was missing from the TRM.

Fix potential unassigned variable

  • Thu, 11 Apr 2013 09:37:25 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Thu, 11 Apr 2013 09:37:25 +0100] rev 139
  • Fix potential unassigned variable

Check return value of fread()

  • Thu, 11 Apr 2013 09:37:11 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Thu, 11 Apr 2013 09:37:11 +0100] rev 138
  • Check return value of fread()

Enable code optimisation to improve quality of GCC warnings

  • Thu, 11 Apr 2013 09:36:53 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Thu, 11 Apr 2013 09:36:53 +0100] rev 137
  • Enable code optimisation to improve quality of GCC warnings

Code cleanup

  • Thu, 11 Apr 2013 09:18:31 +0100
  • by Philip Pemberton <philpem@philpem.me.uk> [Thu, 11 Apr 2013 09:18:31 +0100] rev 136
  • Code cleanup

    * Fix some compiler warnings --
    * string format
    * shift greater than type size,
    * unused variable.

merge changes from default experimental_memory_mapper_v2

  • Wed, 13 Mar 2013 01:10:34 +0000
  • by Philip Pemberton <philpem@philpem.me.uk> [Wed, 13 Mar 2013 01:10:34 +0000] rev 135
  • merge changes from default

[wd2010,main] WD2010 disc geometry fixes

  • Wed, 13 Mar 2013 00:43:25 +0000
  • by Philip Pemberton <philpem@philpem.me.uk> [Wed, 13 Mar 2013 00:43:25 +0000] rev 134
  • [wd2010,main] WD2010 disc geometry fixes

    I believe I have fixed the geometry problem with FreeBee. The geometry was set
    to 17 sectors per track instead of 16, which obviously throws off addressing.
    I changed it to use 16 sectors per track. However, s4diag tries to format
    sector 17, so I changed the WD2010 emulation to accept any address when
    formatting (since the format command doesn't actually do anything, it doesn't
    matter). It is now possible to format the hard disk, initialize the file
    system, and mount it. However, cpio still fails to copy the system to the hard
    disk.

    Author: Andrew Warkentin <andreww591 gmail com>

use MAP_ADDR_TO_PAGE for memory mapping experimental_memory_mapper_v2

  • Wed, 13 Mar 2013 00:40:42 +0000
  • by Philip Pemberton <philpem@philpem.me.uk> [Wed, 13 Mar 2013 00:40:42 +0000] rev 133
  • use MAP_ADDR_TO_PAGE for memory mapping