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