1 /******************************************************************************
4 * Guest OS interface to x86 64-bit Xen.
6 * Copyright (c) 2004, K A Fraser
9 #ifndef __XEN_PUBLIC_ARCH_X86_64_H__
10 #define __XEN_PUBLIC_ARCH_X86_64_H__
13 /* GCC-specific way to pack structure definitions (no implicit padding). */
14 #define PACKED __attribute__ ((packed))
17 /* Pointers are naturally 64 bits in this architecture; no padding needed. */
18 #define _MEMORY_PADDING(_X)
19 #define MEMORY_PADDING
22 * SEGMENT DESCRIPTOR TABLES
25 * A number of GDT entries are reserved by Xen. These are not situated at the
26 * start of the GDT because some stupid OSes export hard-coded selector values
27 * in their ABI. These hard-coded values are always near the start of the GDT,
28 * so Xen places itself out of the way.
30 * NR_RESERVED_GDT_ENTRIES is (8 + 4 * NR_CPUS) Please update this value if
31 * you increase NR_CPUS or add another GDT entry to gdt_table in boot/x86_64.S
33 * NB. The reserved range is inclusive (that is, both FIRST_RESERVED_GDT_ENTRY
34 * and LAST_RESERVED_GDT_ENTRY are reserved).
36 #define NR_RESERVED_GDT_ENTRIES 136
37 #define FIRST_RESERVED_GDT_ENTRY 256
38 #define LAST_RESERVED_GDT_ENTRY \
39 (FIRST_RESERVED_GDT_ENTRY + NR_RESERVED_GDT_ENTRIES - 1)
42 * 64-bit segment selectors
43 * These flat segments are in the Xen-private section of every GDT. Since these
44 * are also present in the initial GDT, many OSes will be able to avoid
45 * installing their own GDT.
48 #define FLAT_RING3_CS32 0x0823 /* GDT index 260 */
49 #define FLAT_RING3_CS64 0x0833 /* GDT index 261 */
50 #define FLAT_RING3_DS32 0x082b /* GDT index 262 */
51 #define FLAT_RING3_DS64 0x0000 /* NULL selector */
52 #define FLAT_RING3_SS32 0x082b /* GDT index 262 */
53 #define FLAT_RING3_SS64 0x082b /* GDT index 262 */
55 #define FLAT_KERNEL_DS64 FLAT_RING3_DS64
56 #define FLAT_KERNEL_DS32 FLAT_RING3_DS32
57 #define FLAT_KERNEL_DS FLAT_KERNEL_DS64
58 #define FLAT_KERNEL_CS64 FLAT_RING3_CS64
59 #define FLAT_KERNEL_CS32 FLAT_RING3_CS32
60 #define FLAT_KERNEL_CS FLAT_KERNEL_CS64
61 #define FLAT_KERNEL_SS64 FLAT_RING3_SS64
62 #define FLAT_KERNEL_SS32 FLAT_RING3_SS32
63 #define FLAT_KERNEL_SS FLAT_KERNEL_SS64
65 #define FLAT_USER_DS64 FLAT_RING3_DS64
66 #define FLAT_USER_DS32 FLAT_RING3_DS32
67 #define FLAT_USER_DS FLAT_USER_DS64
68 #define FLAT_USER_CS64 FLAT_RING3_CS64
69 #define FLAT_USER_CS32 FLAT_RING3_CS32
70 #define FLAT_USER_CS FLAT_USER_CS64
71 #define FLAT_USER_SS64 FLAT_RING3_SS64
72 #define FLAT_USER_SS32 FLAT_RING3_SS32
73 #define FLAT_USER_SS FLAT_USER_SS64
75 /* And the trap vector is... */
76 #define TRAP_INSTR "syscall"
78 #ifndef HYPERVISOR_VIRT_START
79 #define HYPERVISOR_VIRT_START (0xFFFF800000000000UL)
80 #define HYPERVISOR_VIRT_END (0xFFFF880000000000UL)
85 /* The machine->physical mapping table starts at this address, read-only. */
86 #ifndef machine_to_phys_mapping
87 #define machine_to_phys_mapping ((u32 *)HYPERVISOR_VIRT_START)
91 * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
92 * @which == SEGBASE_* ; @base == 64-bit base address
93 * Returns 0 on success.
96 #define SEGBASE_GS_USER 1
97 #define SEGBASE_GS_KERNEL 2
98 #define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
101 * int HYPERVISOR_switch_to_user(void)
102 * All arguments are on the kernel stack, in the following format.
103 * Never returns if successful. Current kernel context is lost.
104 * If flags contains ECF_IN_SYSCALL:
105 * Restore RAX, RIP, RFLAGS, RSP.
106 * Discard R11, RCX, CS, SS.
108 * Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
109 * All other registers are saved on hypercall entry and restored to user.
111 /* Guest exited in SYSCALL context? Return to guest with SYSRET? */
112 #define ECF_IN_SYSCALL (1<<8)
113 struct switch_to_user {
114 /* Top of stack (%rsp at point of hypercall). */
115 u64 rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
116 /* Bottom of switch_to_user stack frame. */
119 /* NB. Both the following are 64 bits each. */
120 typedef unsigned long memory_t; /* Full-sized pointer/address/memory-size. */
121 typedef unsigned long cpureg_t; /* Full-sized register. */
124 * Send an array of these to HYPERVISOR_set_trap_table().
125 * N.B. As in x86/32 mode, the privilege level specifies which modes may enter
126 * a trap via a software interrupt. Since rings 1 and 2 are unavailable, we
127 * allocate privilege levels as follows:
128 * Level == 0: Noone may enter
129 * Level == 1: Kernel may enter
130 * Level == 2: Kernel may enter
131 * Level == 3: Everyone may enter
133 #define TI_GET_DPL(_ti) ((_ti)->flags & 3)
134 #define TI_GET_IF(_ti) ((_ti)->flags & 4)
135 #define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl))
136 #define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2))
138 u8 vector; /* 0: exception vector */
139 u8 flags; /* 1: 0-3: privilege level; 4: clear event enable? */
140 u16 cs; /* 2: code selector */
142 memory_t address; /* 8: code address */
143 } PACKED trap_info_t; /* 16 bytes */
145 typedef struct xen_regs
151 union { u64 rbp, ebp; } PACKED;
152 union { u64 rbx, ebx; } PACKED;
157 union { u64 rax, eax; } PACKED;
158 union { u64 rcx, ecx; } PACKED;
159 union { u64 rdx, edx; } PACKED;
160 union { u64 rsi, esi; } PACKED;
161 union { u64 rdi, edi; } PACKED;
162 u32 error_code; /* private */
163 u32 entry_vector; /* private */
164 union { u64 rip, eip; } PACKED;
166 union { u64 rflags, eflags; } PACKED;
167 union { u64 rsp, esp; } PACKED;
171 u64 fs; /* Non-zero => takes precedence over fs_base. */
172 u64 gs; /* Non-zero => takes precedence over gs_base_app. */
176 } PACKED execution_context_t;
178 typedef u64 tsc_timestamp_t; /* RDTSC timestamp */
181 * The following is all CPU context. Note that the i387_ctxt block is filled
182 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
185 #define ECF_I387_VALID (1<<0)
186 #define ECF_VMX_GUEST (1<<1)
187 #define ECF_IN_KERNEL (1<<2)
189 execution_context_t cpu_ctxt; /* User-level CPU registers */
190 char fpu_ctxt[512]; /* User-level FPU registers */
191 trap_info_t trap_ctxt[256]; /* Virtual IDT */
192 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */
193 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
194 unsigned long kernel_ss, kernel_esp; /* Virtual TSS (only SS1/ESP1) */
195 unsigned long pt_base; /* CR3 (pagetable base) */
196 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */
197 unsigned long event_callback_eip;
198 unsigned long failsafe_callback_eip;
199 unsigned long syscall_callback_eip;
200 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */
201 } PACKED full_execution_context_t;
204 /* MFN of a table of MFNs that make up p2m table */
205 u64 pfn_to_mfn_frame_list;
206 } PACKED arch_shared_info_t;
209 } PACKED arch_vcpu_info_t;
211 #endif /* !__ASSEMBLY__ */