Date: Wed, 27 Aug 2014 08:05:57 +0000 (UTC) From: "Cherry G. Mathew" <cherry@FreeBSD.org> To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r270697 - projects/amd64_xen_pv/sys/amd64/xen Message-ID: <201408270805.s7R85vgZ022267@svn.freebsd.org>
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Author: cherry Date: Wed Aug 27 08:05:57 2014 New Revision: 270697 URL: http://svnweb.freebsd.org/changeset/base/270697 Log: Flag on stack frame that segment registers have been saved. This now completes FreeBSD/Xen pv bringup for UP. Next steps (open list): - Optimise current call paths. (exception.S, amortise across multiple hypercalls etc.) - SMP - vet exception.S (and others) for security. - Bring codebase as close to native as possible, and merge as much code as possible with native and pvhvm. - Merge to -current Approved by: gibbs(implicit) Modified: projects/amd64_xen_pv/sys/amd64/xen/exception.S Modified: projects/amd64_xen_pv/sys/amd64/xen/exception.S ============================================================================== --- projects/amd64_xen_pv/sys/amd64/xen/exception.S Wed Aug 27 06:13:44 2014 (r270696) +++ projects/amd64_xen_pv/sys/amd64/xen/exception.S Wed Aug 27 08:05:57 2014 (r270697) @@ -97,12 +97,16 @@ movq TF_R15(%rsp), %r15 /* Note: %fs/%gs are saved/restored by the hypervisor */ -/* Save generic data segment registers to the stack */ +/* + * Save generic data segment registers to the stack + * Indicate that segments have been saved. + */ #define SAVE_SEGMENT_REGS \ movw %es, TF_ES(%rsp) ; \ movw %ds, TF_DS(%rsp) ; \ movw %fs, TF_FS(%rsp) ; \ movw %gs, TF_FS(%rsp) ; \ + movl $TF_HASSEGS,TF_FLAGS(%rsp) ; \ /* Restore generic data segment registers from the stack */ /* This macro overwrites some general registers */
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