98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/******************************************************************************
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* arch-x86_32.h
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*
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* Guest OS interface to x86 32-bit Xen.
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*
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* Copyright (c) 2004, K A Fraser
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*/
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#ifndef _ASM_X86_XEN_INTERFACE_32_H
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#define _ASM_X86_XEN_INTERFACE_32_H
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/*
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* These flat segments are in the Xen-private section of every GDT. Since these
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* are also present in the initial GDT, many OSes will be able to avoid
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* installing their own GDT.
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*/
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#define FLAT_RING1_CS 0xe019 /* GDT index 259 */
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#define FLAT_RING1_DS 0xe021 /* GDT index 260 */
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#define FLAT_RING1_SS 0xe021 /* GDT index 260 */
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#define FLAT_RING3_CS 0xe02b /* GDT index 261 */
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#define FLAT_RING3_DS 0xe033 /* GDT index 262 */
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#define FLAT_RING3_SS 0xe033 /* GDT index 262 */
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#define FLAT_KERNEL_CS FLAT_RING1_CS
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#define FLAT_KERNEL_DS FLAT_RING1_DS
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#define FLAT_KERNEL_SS FLAT_RING1_SS
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#define FLAT_USER_CS FLAT_RING3_CS
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#define FLAT_USER_DS FLAT_RING3_DS
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#define FLAT_USER_SS FLAT_RING3_SS
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/* And the trap vector is... */
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#define TRAP_INSTR "int $0x82"
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/*
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* Virtual addresses beyond this are not modifiable by guest OSes. The
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* machine->physical mapping table starts at this address, read-only.
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*/
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#define __HYPERVISOR_VIRT_START 0xF5800000
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#ifndef __ASSEMBLY__
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struct cpu_user_regs {
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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uint32_t esi;
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uint32_t edi;
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uint32_t ebp;
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uint32_t eax;
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uint16_t error_code; /* private */
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uint16_t entry_vector; /* private */
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uint32_t eip;
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uint16_t cs;
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uint8_t saved_upcall_mask;
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uint8_t _pad0;
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uint32_t eflags; /* eflags.IF == !saved_upcall_mask */
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uint32_t esp;
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uint16_t ss, _pad1;
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uint16_t es, _pad2;
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uint16_t ds, _pad3;
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uint16_t fs, _pad4;
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uint16_t gs, _pad5;
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};
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DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
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typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
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struct arch_vcpu_info {
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unsigned long cr2;
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unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
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};
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struct xen_callback {
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unsigned long cs;
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unsigned long eip;
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};
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typedef struct xen_callback xen_callback_t;
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#define XEN_CALLBACK(__cs, __eip) \
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((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) })
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#endif /* !__ASSEMBLY__ */
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/*
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* Page-directory addresses above 4GB do not fit into architectural %cr3.
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* When accessing %cr3, or equivalent field in vcpu_guest_context, guests
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* must use the following accessor macros to pack/unpack valid MFNs.
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*
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* Note that Xen is using the fact that the pagetable base is always
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* page-aligned, and putting the 12 MSB of the address into the 12 LSB
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* of cr3.
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*/
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#define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
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#define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
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#endif /* _ASM_X86_XEN_INTERFACE_32_H */
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