1. 15 6月, 2006 11 次提交
  2. 13 6月, 2006 1 次提交
  3. 12 6月, 2006 9 次提交
  4. 11 6月, 2006 9 次提交
  5. 10 6月, 2006 5 次提交
  6. 09 6月, 2006 5 次提交
    • M
      [PATCH] powerpc: Cleanup hvc_rtas.c a little · 6b81e800
      Michael Ellerman 提交于
      A few cleanups in hvc_rtas.c:
       1. Remove unused RTASCONS_PUT_ATTEMPTS
       2. Remove unused rtascons_put_delay.
       3. Use i as a loop counter like everyone else on earth.
       4. Remove pointless variables, eg. x = foo; if (x) return something_else;
       5. Whitespace cleanups and formatting.
      Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      6b81e800
    • M
      [PATCH] powerpc: Make rtas console _much_ faster · b5374461
      Michael Ellerman 提交于
      Currently the hvc_rtas driver is painfully slow to use. Our "benchmark" is
      ls -R /etc, which spits out about 27866 characters. The theoretical maximum
      speed would be about 2.2 seconds, the current code takes ~50 seconds.
      
      The core of the problem is that sometimes when the tty layer asks us to push
      characters the firmware isn't able to handle some or all of them, and so
      returns an error. The current code sees this and just returns to the tty code
      with the buffer half sent.
      
      The khvcd thread will eventually wake up and try to push more characters, which
      will usually work because by then the firmware's had time to make room. But
      the khvcd thread only wakes up every 10 milliseconds, which isn't fast enough.
      
      So change the khvcd thread logic so that if there's an incomplete write we
      yield() and then immediately try writing again. Doing so makes POLL_QUICK and
      POLL_WRITE synonymous, so remove POLL_QUICK.
      
      With this patch our "benchmark" takes ~2.8 seconds.
      Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      b5374461
    • P
      [PATCH] powerpc: Implement PR_[GS]ET_UNALIGN prctls for powerpc · e9370ae1
      Paul Mackerras 提交于
      This gives the ability to control whether alignment exceptions get
      fixed up or reported to the process as a SIGBUS, using the existing
      PR_SET_UNALIGN and PR_GET_UNALIGN prctls.  We do not implement the
      option of logging a message on alignment exceptions.
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      e9370ae1
    • P
      [PATCH] powerpc: Implement support for setting little-endian mode via prctl · fab5db97
      Paul Mackerras 提交于
      This adds the PowerPC part of the code to allow processes to change
      their endian mode via prctl.
      
      This also extends the alignment exception handler to be able to fix up
      alignment exceptions that occur in little-endian mode, both for
      "PowerPC" little-endian and true little-endian.
      
      We always enter signal handlers in big-endian mode -- the support for
      little-endian mode does not amount to the creation of a little-endian
      user/kernel ABI.  If the signal handler returns, the endian mode is
      restored to what it was when the signal was delivered.
      
      We have two new kernel CPU feature bits, one for PPC little-endian and
      one for true little-endian.  Most of the classic 32-bit processors
      support PPC little-endian, and this is reflected in the CPU feature
      table.  There are two corresponding feature bits reported to userland
      in the AT_HWCAP aux vector entry.
      
      This is based on an earlier patch by Anton Blanchard.
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      fab5db97
    • A
      [PATCH] Add a prctl to change the endianness of a process. · 651d765d
      Anton Blanchard 提交于
      This new prctl is intended for changing the execution mode of the
      processor, on processors that support both a little-endian mode and a
      big-endian mode.  It is intended for use by programs such as
      instruction set emulators (for example an x86 emulator on PowerPC),
      which may find it convenient to use the processor in an alternate
      endianness mode when executing translated instructions.
      
      Note that this does not imply the existence of a fully-fledged ABI for
      both endiannesses, or of compatibility code for converting system
      calls done in the non-native endianness mode.  The program is expected
      to arrange for all of its system call arguments to be presented in the
      native endianness.
      
      Switching between big and little-endian mode will require some care in
      constructing the instruction sequence for the switch.  Generally the
      instructions up to the instruction that invokes the prctl system call
      will have to be in the old endianness, and subsequent instructions
      will have to be in the new endianness.
      Signed-off-by: NAnton Blanchard <anton@samba.org>
      Signed-off-by: NPaul Mackerras <paulus@samba.org>
      651d765d