/* SPDX-License-Identifier: GPL-2.0 */
/******************************************************************************
* arch - x86_32 . h
*
* Guest OS interface to x86 32 - bit Xen .
*
* Copyright ( c ) 2004 , K A Fraser
*/
#ifndef _ASM_X86_XEN_INTERFACE_32_H
#define _ASM_X86_XEN_INTERFACE_32_H
/*
* These flat segments are in the Xen - private section of every GDT . Since these
* are also present in the initial GDT , many OSes will be able to avoid
* installing their own GDT .
*/
#define FLAT_RING1_CS 0 xe019 /* GDT index 259 */
#define FLAT_RING1_DS 0 xe021 /* GDT index 260 */
#define FLAT_RING1_SS 0 xe021 /* GDT index 260 */
#define FLAT_RING3_CS 0 xe02b /* GDT index 261 */
#define FLAT_RING3_DS 0 xe033 /* GDT index 262 */
#define FLAT_RING3_SS 0 xe033 /* GDT index 262 */
#define FLAT_KERNEL_CS FLAT_RING1_CS
#define FLAT_KERNEL_DS FLAT_RING1_DS
#define FLAT_KERNEL_SS FLAT_RING1_SS
#define FLAT_USER_CS FLAT_RING3_CS
#define FLAT_USER_DS FLAT_RING3_DS
#define FLAT_USER_SS FLAT_RING3_SS
/* And the trap vector is... */
#define TRAP_INSTR "int $0x82"
#define __MACH2PHYS_VIRT_START 0 xF5800000
#define __MACH2PHYS_VIRT_END 0 xF6800000
#define __MACH2PHYS_SHIFT 2
/*
* Virtual addresses beyond this are not modifiable by guest OSes . The
* machine - > physical mapping table starts at this address , read - only .
*/
#define __HYPERVISOR_VIRT_START 0 xF5800000
#ifndef __ASSEMBLER__
struct cpu_user_regs {
uint32_t ebx;
uint32_t ecx;
uint32_t edx;
uint32_t esi;
uint32_t edi;
uint32_t ebp;
uint32_t eax;
uint16_t error_code; /* private */
uint16_t entry_vector; /* private */
uint32_t eip;
uint16_t cs;
uint8_t saved_upcall_mask;
uint8_t _pad0;
uint32_t eflags; /* eflags.IF == !saved_upcall_mask */
uint32_t esp;
uint16_t ss, _pad1;
uint16_t es, _pad2;
uint16_t ds, _pad3;
uint16_t fs, _pad4;
uint16_t gs, _pad5;
};
DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
struct arch_vcpu_info {
unsigned long cr2;
unsigned long pad[5 ]; /* sizeof(struct vcpu_info) == 64 */
};
struct xen_callback {
unsigned long cs;
unsigned long eip;
};
typedef struct xen_callback xen_callback_t;
#define XEN_CALLBACK(__cs, __eip) \
((struct xen_callback){ .cs = (__cs), .eip = (unsigned long )(__eip) })
#endif /* !__ASSEMBLER__ */
/*
* Page - directory addresses above 4 GB do not fit into architectural % cr3 .
* When accessing % cr3 , or equivalent field in vcpu_guest_context , guests
* must use the following accessor macros to pack / unpack valid MFNs .
*
* Note that Xen is using the fact that the pagetable base is always
* page - aligned , and putting the 12 MSB of the address into the 12 LSB
* of cr3 .
*/
#define xen_pfn_to_cr3(pfn) (((unsigned )(pfn) << 12 ) | ((unsigned )(pfn) >> 20 ))
#define xen_cr3_to_pfn(cr3) (((unsigned )(cr3) >> 12 ) | ((unsigned )(cr3) << 20 ))
#endif /* _ASM_X86_XEN_INTERFACE_32_H */
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