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From: "Justin T. Gibbs" <gibbs@FreeBSD.ORG>
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Date: Sun, 22 Nov 1998 17:33:49 -0800 (PST)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/dev/aic7xxx aic7xxx.c aic7xxx.h aic7xxx.reg
         aic7xxx.seq
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gibbs       1998/11/22 17:33:49 PST

  Modified files:
    sys/dev/aic7xxx      aic7xxx.c aic7xxx.h aic7xxx.reg 
                         aic7xxx.seq 
  Log:
  Change the delivery mechanism for incoming target commands.  We now
  use a 256 entry ring buffer of descriptersfor this purpose.  This allows
  the use of a simple 8bit counter in the sequencer code for tracking start
  location.
  
  Entries in the ring buffer now contain a "cmd_valid" byte at their tail.
  As an entry is serviced, this byte is cleared by the kernel and set by
  the sequencer during its dma of a new entry.  Since this byte is the last
  portion of the command touched during a dma, the kernel can use this
  byte to ensure the command it processes is completely valid.
  
  The new command format requires a fixed sized DMA from the controller
  to deliver which allowed for additional simplification of the sequencer
  code.  The hack that required 1 SCB slot to be stolen for incoming
  command delivery notification is also gone.
  
  Revision  Changes    Path
  1.10      +29 -31    src/sys/dev/aic7xxx/aic7xxx.c
  1.2       +20 -9     src/sys/dev/aic7xxx/aic7xxx.h
  1.8       +21 -5     src/sys/dev/aic7xxx/aic7xxx.reg
  1.80      +29 -38    src/sys/dev/aic7xxx/aic7xxx.seq

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