Date: Mon, 1 Dec 2008 16:32:45 +0000 (UTC) From: Doug Rabson <dfr@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r185520 - user/dfr/xenhvm/6/sys/amd64/amd64 Message-ID: <200812011632.mB1GWjgT030529@svn.freebsd.org>
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Author: dfr Date: Mon Dec 1 16:32:45 2008 New Revision: 185520 URL: http://svn.freebsd.org/changeset/base/185520 Log: Add a magic sequence which unplugs block and network devices from Xen's hardware emulator so that we can safely attach PV drivers to them without fighting with the ata and re drivers. Modified: user/dfr/xenhvm/6/sys/amd64/amd64/machdep.c Modified: user/dfr/xenhvm/6/sys/amd64/amd64/machdep.c ============================================================================== --- user/dfr/xenhvm/6/sys/amd64/amd64/machdep.c Mon Dec 1 15:27:00 2008 (r185519) +++ user/dfr/xenhvm/6/sys/amd64/amd64/machdep.c Mon Dec 1 16:32:45 2008 (r185520) @@ -1352,6 +1352,14 @@ hammer_time(u_int64_t modulep, u_int64_t if (env != NULL) strlcpy(kernelname, env, sizeof(kernelname)); +#ifdef XENHVM + if (inw(0x10) == 0x49d2) { + if (bootverbose) + printf("Xen detected: disabling emulated block and network devices\n"); + outw(0x10, 3); + } +#endif + /* Location of kernel stack for locore */ return ((u_int64_t)thread0.td_pcb); }
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