1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /****************************************************************************** 3 * arch-x86_32.h 4 * 5 * Guest OS interface to x86 32-bit Xen. 6 * 7 * Copyright (c) 2004, K A Fraser 8 */ 9 10 #ifndef _ASM_X86_XEN_INTERFACE_32_H 11 #define _ASM_X86_XEN_INTERFACE_32_H 12 13 14 /* 15 * These flat segments are in the Xen-private section of every GDT. Since these 16 * are also present in the initial GDT, many OSes will be able to avoid 17 * installing their own GDT. 18 */ 19 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 20 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 21 #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ 22 #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ 23 #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ 24 #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ 25 26 #define FLAT_KERNEL_CS FLAT_RING1_CS 27 #define FLAT_KERNEL_DS FLAT_RING1_DS 28 #define FLAT_KERNEL_SS FLAT_RING1_SS 29 #define FLAT_USER_CS FLAT_RING3_CS 30 #define FLAT_USER_DS FLAT_RING3_DS 31 #define FLAT_USER_SS FLAT_RING3_SS 32 33 /* And the trap vector is... */ 34 #define TRAP_INSTR "int $0x82" 35 36 #define __MACH2PHYS_VIRT_START 0xF5800000 37 #define __MACH2PHYS_VIRT_END 0xF6800000 38 39 #define __MACH2PHYS_SHIFT 2 40 41 /* 42 * Virtual addresses beyond this are not modifiable by guest OSes. The 43 * machine->physical mapping table starts at this address, read-only. 44 */ 45 #define __HYPERVISOR_VIRT_START 0xF5800000 46 47 #ifndef __ASSEMBLY__ 48 49 struct cpu_user_regs { 50 uint32_t ebx; 51 uint32_t ecx; 52 uint32_t edx; 53 uint32_t esi; 54 uint32_t edi; 55 uint32_t ebp; 56 uint32_t eax; 57 uint16_t error_code; /* private */ 58 uint16_t entry_vector; /* private */ 59 uint32_t eip; 60 uint16_t cs; 61 uint8_t saved_upcall_mask; 62 uint8_t _pad0; 63 uint32_t eflags; /* eflags.IF == !saved_upcall_mask */ 64 uint32_t esp; 65 uint16_t ss, _pad1; 66 uint16_t es, _pad2; 67 uint16_t ds, _pad3; 68 uint16_t fs, _pad4; 69 uint16_t gs, _pad5; 70 }; 71 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs); 72 73 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ 74 75 struct arch_vcpu_info { 76 unsigned long cr2; 77 unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */ 78 }; 79 80 struct xen_callback { 81 unsigned long cs; 82 unsigned long eip; 83 }; 84 typedef struct xen_callback xen_callback_t; 85 86 #define XEN_CALLBACK(__cs, __eip) \ 87 ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) }) 88 #endif /* !__ASSEMBLY__ */ 89 90 91 /* 92 * Page-directory addresses above 4GB do not fit into architectural %cr3. 93 * When accessing %cr3, or equivalent field in vcpu_guest_context, guests 94 * must use the following accessor macros to pack/unpack valid MFNs. 95 * 96 * Note that Xen is using the fact that the pagetable base is always 97 * page-aligned, and putting the 12 MSB of the address into the 12 LSB 98 * of cr3. 99 */ 100 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) 101 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) 102 103 #endif /* _ASM_X86_XEN_INTERFACE_32_H */ 104