Xen Test Framework
arch
x86
include
arch
segment.h
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#ifndef XTF_X86_SEGMENT_H
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#define XTF_X86_SEGMENT_H
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#include <
xtf/types.h
>
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#include <
xen/arch-x86/xen.h
>
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/*
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* GDT layout:
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*
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* For simplicitly, the gdt is shared as much as possible between different
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* environments.
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*
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* 0 - null
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* 1 - 64bit supervisor code
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* 2 - 32bit supervisor code
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* 3 - 32bit supervisor data
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* 4 - 64bit userspace code
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* 5 - 32bit userspace code
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* 6 - 32bit userspace data
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* 7/8 - TSS (two slots in long mode)
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* 8 - DF TSS (32bit only)
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*
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* 9-14 - Available for test use
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*/
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#define GDTE_CS64_DPL0 1
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#define GDTE_CS32_DPL0 2
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#define GDTE_DS32_DPL0 3
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#define GDTE_CS64_DPL3 4
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#define GDTE_CS32_DPL3 5
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#define GDTE_DS32_DPL3 6
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#define GDTE_TSS 7
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#define GDTE_TSS_DF 8
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#define GDTE_AVAIL0 9
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#define GDTE_AVAIL1 10
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#define GDTE_AVAIL2 11
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#define GDTE_AVAIL3 12
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#define GDTE_AVAIL4 13
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#define GDTE_AVAIL5 14
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#define NR_GDT_ENTRIES 15
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/*
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* HVM guests use the GDT directly.
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*/
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#if defined(CONFIG_HVM)
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#ifdef __x86_64__
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#define __KERN_CS (GDTE_CS64_DPL0 * 8)
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#define __KERN_DS (0)
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#define __KERN_CS32 (GDTE_CS32_DPL0 * 8)
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#define __KERN_DS32 __KERN_DS
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#define __USER_CS (GDTE_CS64_DPL3 * 8 + 3)
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#define __USER_DS (GDTE_DS32_DPL3 * 8 + 3)
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#define __USER_CS32 (GDTE_CS32_DPL3 * 8 + 3)
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#define __USER_DS32 __USER_DS
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#else
/* __x86_64__ */
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#define __KERN_CS (GDTE_CS32_DPL0 * 8)
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#define __KERN_DS (GDTE_DS32_DPL0 * 8)
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#define __KERN_CS32 __KERN_CS
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#define __KERN_DS32 __KERN_DS
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#define __USER_CS (GDTE_CS32_DPL3 * 8 + 3)
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#define __USER_DS (GDTE_DS32_DPL3 * 8 + 3)
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#define __USER_CS32 __USER_CS
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#define __USER_DS32 __USER_DS
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#endif
/* __x86_64__ */
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#define TSS_SEL (GDTE_TSS * 8)
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#endif
/* CONFIG_HVM */
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/*
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* PV guests by default use the Xen ABI-provided selectors.
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*/
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#if defined(CONFIG_PV)
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#ifdef __x86_64__
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/*
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* 64bit PV guest kernels run in cpl3, but exception frames generated by Xen
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* report cpl0 when interrupting kernel mode. Trim the kernel selectors down
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* to rpl0 so they match the exception frames; Xen will take care of bumping
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* rpl back to 3 when required.
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*
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* In Long mode, it is permitted to have NULL selectors for the plain data
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* segment selectors (this is expressed in the Xen ABI), but not for %ss. As
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* __{KERN,USER}_DS are used for all data selectors including %ss, use the
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* FLAT_RING3_SS64 rather than FLAT_RING3_DS64.
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*/
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#define __KERN_CS (FLAT_RING3_CS64 & ~3)
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#define __KERN_DS (FLAT_RING3_SS64 & ~3)
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#define __KERN_CS32 (FLAT_RING3_CS32 & ~3)
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#define __KERN_DS32 __KERN_DS
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#define __USER_CS FLAT_RING3_CS64
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#define __USER_DS FLAT_RING3_SS64
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#define __USER_CS32 FLAT_RING3_CS32
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#define __USER_DS32 __USER_DS
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#else
/* __x86_64__ */
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#define __KERN_CS FLAT_RING1_CS
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#define __KERN_DS FLAT_RING1_DS
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#define __KERN_CS32 __KERN_CS
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#define __KERN_DS32 __KERN_DS
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#define __USER_CS FLAT_RING3_CS
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#define __USER_DS FLAT_RING3_DS
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#define __USER_CS32 __USER_CS
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#define __USER_DS32 __USER_DS
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#endif
/* __x86_64__ */
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#endif
/* CONFIG_PV */
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#endif
/* XTF_X86_SEGMENT_H */
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
xen.h
types.h
Common declarations for all tests.
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