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 /* 36 * Virtual addresses beyond this are not modifiable by guest OSes. The 37 * machine->physical mapping table starts at this address, read-only. 38 */ 39 #define __HYPERVISOR_VIRT_START 0xF5800000 40 41 #ifndef __ASSEMBLY__ 42 43 struct cpu_user_regs { 44 uint32_t ebx; 45 uint32_t ecx; 46 uint32_t edx; 47 uint32_t esi; 48 uint32_t edi; 49 uint32_t ebp; 50 uint32_t eax; 51 uint16_t error_code; /* private */ 52 uint16_t entry_vector; /* private */ 53 uint32_t eip; 54 uint16_t cs; 55 uint8_t saved_upcall_mask; 56 uint8_t _pad0; 57 uint32_t eflags; /* eflags.IF == !saved_upcall_mask */ 58 uint32_t esp; 59 uint16_t ss, _pad1; 60 uint16_t es, _pad2; 61 uint16_t ds, _pad3; 62 uint16_t fs, _pad4; 63 uint16_t gs, _pad5; 64 }; 65 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs); 66 67 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ 68 69 struct arch_vcpu_info { 70 unsigned long cr2; 71 unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */ 72 }; 73 74 struct xen_callback { 75 unsigned long cs; 76 unsigned long eip; 77 }; 78 typedef struct xen_callback xen_callback_t; 79 80 #define XEN_CALLBACK(__cs, __eip) \ 81 ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) }) 82 #endif /* !__ASSEMBLY__ */ 83 84 85 /* 86 * Page-directory addresses above 4GB do not fit into architectural %cr3. 87 * When accessing %cr3, or equivalent field in vcpu_guest_context, guests 88 * must use the following accessor macros to pack/unpack valid MFNs. 89 * 90 * Note that Xen is using the fact that the pagetable base is always 91 * page-aligned, and putting the 12 MSB of the address into the 12 LSB 92 * of cr3. 93 */ 94 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) 95 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) 96 97 #endif /* _ASM_X86_XEN_INTERFACE_32_H */ 98