1/****************************************************************************** 2 * arch-x86_32.h 3 * 4 * Guest OS interface to x86 32-bit Xen. 5 * 6 * Copyright (c) 2004, K A Fraser 7 */ 8 9#ifndef _ASM_X86_XEN_INTERFACE_32_H 10#define _ASM_X86_XEN_INTERFACE_32_H 11 12 13/* 14 * These flat segments are in the Xen-private section of every GDT. Since these 15 * are also present in the initial GDT, many OSes will be able to avoid 16 * installing their own GDT. 17 */ 18#define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 19#define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 20#define FLAT_RING1_SS 0xe021 /* GDT index 260 */ 21#define FLAT_RING3_CS 0xe02b /* GDT index 261 */ 22#define FLAT_RING3_DS 0xe033 /* GDT index 262 */ 23#define FLAT_RING3_SS 0xe033 /* GDT index 262 */ 24 25#define FLAT_KERNEL_CS FLAT_RING1_CS 26#define FLAT_KERNEL_DS FLAT_RING1_DS 27#define FLAT_KERNEL_SS FLAT_RING1_SS 28#define FLAT_USER_CS FLAT_RING3_CS 29#define FLAT_USER_DS FLAT_RING3_DS 30#define FLAT_USER_SS FLAT_RING3_SS 31 32/* And the trap vector is... */ 33#define TRAP_INSTR "int $0x82" 34 35#define __MACH2PHYS_VIRT_START 0xF5800000 36#define __MACH2PHYS_VIRT_END 0xF6800000 37 38#define __MACH2PHYS_SHIFT 2 39 40/* 41 * Virtual addresses beyond this are not modifiable by guest OSes. The 42 * machine->physical mapping table starts at this address, read-only. 43 */ 44#define __HYPERVISOR_VIRT_START 0xF5800000 45 46#ifndef __ASSEMBLY__ 47 48struct cpu_user_regs { 49 uint32_t ebx; 50 uint32_t ecx; 51 uint32_t edx; 52 uint32_t esi; 53 uint32_t edi; 54 uint32_t ebp; 55 uint32_t eax; 56 uint16_t error_code; /* private */ 57 uint16_t entry_vector; /* private */ 58 uint32_t eip; 59 uint16_t cs; 60 uint8_t saved_upcall_mask; 61 uint8_t _pad0; 62 uint32_t eflags; /* eflags.IF == !saved_upcall_mask */ 63 uint32_t esp; 64 uint16_t ss, _pad1; 65 uint16_t es, _pad2; 66 uint16_t ds, _pad3; 67 uint16_t fs, _pad4; 68 uint16_t gs, _pad5; 69}; 70DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs); 71 72typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ 73 74struct arch_vcpu_info { 75 unsigned long cr2; 76 unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */ 77}; 78 79struct xen_callback { 80 unsigned long cs; 81 unsigned long eip; 82}; 83typedef struct xen_callback xen_callback_t; 84 85#define XEN_CALLBACK(__cs, __eip) \ 86 ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) }) 87#endif /* !__ASSEMBLY__ */ 88 89 90/* 91 * Page-directory addresses above 4GB do not fit into architectural %cr3. 92 * When accessing %cr3, or equivalent field in vcpu_guest_context, guests 93 * must use the following accessor macros to pack/unpack valid MFNs. 94 * 95 * Note that Xen is using the fact that the pagetable base is always 96 * page-aligned, and putting the 12 MSB of the address into the 12 LSB 97 * of cr3. 98 */ 99#define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) 100#define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) 101 102#endif /* _ASM_X86_XEN_INTERFACE_32_H */ 103