From owner-freebsd-emulation  Thu Feb  1 10:59:28 2001
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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Thu,  1 Feb 2001 13:59:05 -0500 (EST)
To: "Sam Leffler" <sam@errno.com>
Cc: <freebsd-emulation@FreeBSD.ORG>
Subject: Re: experiences running vmware w/freebsd 5.0-current as guest
In-Reply-To: <06d701c08c72$49a9d080$24a6d4d1@melange>
References: <14968.51758.59870.15884@grasshopper.cs.duke.edu>
	<06d701c08c72$49a9d080$24a6d4d1@melange>
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Sam Leffler writes:

<...>
 > > a) VMware crashes when the pcn driver probes the AMD PCInet card.
 > > This is indicated by a "NOT_IMPLEMENTED F(562):1654" message
 > > shortly after FreeBSD probes the PCI bus, right after
 > > message pci0: <display> at 15.0 (no driver attached).
 > >
 > 
 > This assertion is caused by the pcn driver doing 32-bit ins and outs to
 > 16-bit registers (the upper 16 bits are reserved).

OK.  Cool.  So this should be fixable.  I don't know anything about
the PCInet's registers, though.  Perhaps we should get the driver's
author involved.

<...>
 > 
 > It could be that the use of the cmpxchgl instruction is finding a slow path
 > through the runtime; if you have the code fragment handy I can forward it to
 > the appropriate VMware folks.
 > 

The I386_CPU path is the "fast path" under vmware, the #else clause is 
the slow path under vmware:

#if defined(I386_CPU)
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
{
        int res = exp;

        __asm __volatile(
        "       pushfl ;                "
        "       cli ;                   "
        "       cmpl    %1,%3 ;         "
        "       jne     1f ;            "
        "       movl    %2,%3 ;         "
        "1:                             "
        "       sete    %%al;           "
        "       movzbl  %%al,%0 ;       "
        "       popfl ;                 "
        "# atomic_cmpset_int"
        : "=a" (res)                    /* 0 (result) */
        : "0" (exp),                    /* 1 */
          "r" (src),                    /* 2 */
          "m" (*(dst))                  /* 3 */
        : "memory");

        return (res);
}
#else /* defined(I386_CPU) */
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
{
        int res = exp;

        __asm __volatile (
        "       " MPLOCKED "            "
        "       cmpxchgl %2,%3 ;        "
        "       setz    %%al ;          "
        "       movzbl  %%al,%0 ;       "
        "1:                             "
        "# atomic_cmpset_int"
        : "=a" (res)                    /* 0 (result) */
        : "0" (exp),                    /* 1 */
          "r" (src),                    /* 2 */
          "m" (*(dst))                  /* 3 */
        : "memory");                             

        return (res);
}
#endif /* defined(I386_CPU) */


Thanks!
Drew

------------------------------------------------------------------------------
Andrew Gallatin, Sr Systems Programmer	http://www.cs.duke.edu/~gallatin
Duke University				Email: gallatin@cs.duke.edu
Department of Computer Science		Phone: (919) 660-6590


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