1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_XEN_INTERFACE_64_H 3 #define _ASM_X86_XEN_INTERFACE_64_H 4 5 /* 6 * 64-bit segment selectors 7 * These flat segments are in the Xen-private section of every GDT. Since these 8 * are also present in the initial GDT, many OSes will be able to avoid 9 * installing their own GDT. 10 */ 11 12 #define FLAT_RING3_CS32 0xe023 /* GDT index 260 */ 13 #define FLAT_RING3_CS64 0xe033 /* GDT index 261 */ 14 #define FLAT_RING3_DS32 0xe02b /* GDT index 262 */ 15 #define FLAT_RING3_DS64 0x0000 /* NULL selector */ 16 #define FLAT_RING3_SS32 0xe02b /* GDT index 262 */ 17 #define FLAT_RING3_SS64 0xe02b /* GDT index 262 */ 18 19 #define FLAT_KERNEL_DS64 FLAT_RING3_DS64 20 #define FLAT_KERNEL_DS32 FLAT_RING3_DS32 21 #define FLAT_KERNEL_DS FLAT_KERNEL_DS64 22 #define FLAT_KERNEL_CS64 FLAT_RING3_CS64 23 #define FLAT_KERNEL_CS32 FLAT_RING3_CS32 24 #define FLAT_KERNEL_CS FLAT_KERNEL_CS64 25 #define FLAT_KERNEL_SS64 FLAT_RING3_SS64 26 #define FLAT_KERNEL_SS32 FLAT_RING3_SS32 27 #define FLAT_KERNEL_SS FLAT_KERNEL_SS64 28 29 #define FLAT_USER_DS64 FLAT_RING3_DS64 30 #define FLAT_USER_DS32 FLAT_RING3_DS32 31 #define FLAT_USER_DS FLAT_USER_DS64 32 #define FLAT_USER_CS64 FLAT_RING3_CS64 33 #define FLAT_USER_CS32 FLAT_RING3_CS32 34 #define FLAT_USER_CS FLAT_USER_CS64 35 #define FLAT_USER_SS64 FLAT_RING3_SS64 36 #define FLAT_USER_SS32 FLAT_RING3_SS32 37 #define FLAT_USER_SS FLAT_USER_SS64 38 39 #define __HYPERVISOR_VIRT_START 0xFFFF800000000000 40 #define __HYPERVISOR_VIRT_END 0xFFFF880000000000 41 #define __MACH2PHYS_VIRT_START 0xFFFF800000000000 42 #define __MACH2PHYS_VIRT_END 0xFFFF804000000000 43 #define __MACH2PHYS_SHIFT 3 44 45 /* 46 * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base) 47 * @which == SEGBASE_* ; @base == 64-bit base address 48 * Returns 0 on success. 49 */ 50 #define SEGBASE_FS 0 51 #define SEGBASE_GS_USER 1 52 #define SEGBASE_GS_KERNEL 2 53 #define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */ 54 55 /* 56 * int HYPERVISOR_iret(void) 57 * All arguments are on the kernel stack, in the following format. 58 * Never returns if successful. Current kernel context is lost. 59 * The saved CS is mapped as follows: 60 * RING0 -> RING3 kernel mode. 61 * RING1 -> RING3 kernel mode. 62 * RING2 -> RING3 kernel mode. 63 * RING3 -> RING3 user mode. 64 * However RING0 indicates that the guest kernel should return to iteself 65 * directly with 66 * orb $3,1*8(%rsp) 67 * iretq 68 * If flags contains VGCF_in_syscall: 69 * Restore RAX, RIP, RFLAGS, RSP. 70 * Discard R11, RCX, CS, SS. 71 * Otherwise: 72 * Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP. 73 * All other registers are saved on hypercall entry and restored to user. 74 */ 75 /* Guest exited in SYSCALL context? Return to guest with SYSRET? */ 76 #define _VGCF_in_syscall 8 77 #define VGCF_in_syscall (1<<_VGCF_in_syscall) 78 #define VGCF_IN_SYSCALL VGCF_in_syscall 79 80 #ifndef __ASSEMBLY__ 81 82 struct iret_context { 83 /* Top of stack (%rsp at point of hypercall). */ 84 uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss; 85 /* Bottom of iret stack frame. */ 86 }; 87 88 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) 89 /* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */ 90 #define __DECL_REG(name) union { \ 91 uint64_t r ## name, e ## name; \ 92 uint32_t _e ## name; \ 93 } 94 #else 95 /* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */ 96 #define __DECL_REG(name) uint64_t r ## name 97 #endif 98 99 struct cpu_user_regs { 100 uint64_t r15; 101 uint64_t r14; 102 uint64_t r13; 103 uint64_t r12; 104 __DECL_REG(bp); 105 __DECL_REG(bx); 106 uint64_t r11; 107 uint64_t r10; 108 uint64_t r9; 109 uint64_t r8; 110 __DECL_REG(ax); 111 __DECL_REG(cx); 112 __DECL_REG(dx); 113 __DECL_REG(si); 114 __DECL_REG(di); 115 uint32_t error_code; /* private */ 116 uint32_t entry_vector; /* private */ 117 __DECL_REG(ip); 118 uint16_t cs, _pad0[1]; 119 uint8_t saved_upcall_mask; 120 uint8_t _pad1[3]; 121 __DECL_REG(flags); /* rflags.IF == !saved_upcall_mask */ 122 __DECL_REG(sp); 123 uint16_t ss, _pad2[3]; 124 uint16_t es, _pad3[3]; 125 uint16_t ds, _pad4[3]; 126 uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base. */ 127 uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */ 128 }; 129 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs); 130 131 #undef __DECL_REG 132 133 #define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12) 134 #define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12) 135 136 struct arch_vcpu_info { 137 unsigned long cr2; 138 unsigned long pad; /* sizeof(vcpu_info_t) == 64 */ 139 }; 140 141 typedef unsigned long xen_callback_t; 142 143 #define XEN_CALLBACK(__cs, __rip) \ 144 ((unsigned long)(__rip)) 145 146 #endif /* !__ASSEMBLY__ */ 147 148 149 #endif /* _ASM_X86_XEN_INTERFACE_64_H */ 150