1 /******************************************************************************
4 * Guest OS interface to x86 32-bit Xen.
6 * Copyright (c) 2004, K A Fraser
9 #ifndef __XEN_PUBLIC_ARCH_X86_32_H__
10 #define __XEN_PUBLIC_ARCH_X86_32_H__
13 /* GCC-specific way to pack structure definitions (no implicit padding). */
14 #define PACKED __attribute__ ((packed))
18 * Pointers and other address fields inside interface structures are padded to
19 * 64 bits. This means that field alignments aren't different between 32- and
20 * 64-bit architectures.
22 /* NB. Multi-level macro ensures __LINE__ is expanded before concatenation. */
23 #define __MEMORY_PADDING(_X) u32 __pad_ ## _X
24 #define _MEMORY_PADDING(_X) __MEMORY_PADDING(_X)
25 #define MEMORY_PADDING _MEMORY_PADDING(__LINE__)
28 * SEGMENT DESCRIPTOR TABLES
31 * A number of GDT entries are reserved by Xen. These are not situated at the
32 * start of the GDT because some stupid OSes export hard-coded selector values
33 * in their ABI. These hard-coded values are always near the start of the GDT,
34 * so Xen places itself out of the way.
36 * NR_RESERVED_GDT_ENTRIES is (8 + 2 * NR_CPUS) Please update this value if
37 * you increase NR_CPUS or add another GDT entry to gdt_table in x86_32.S
39 * NB. The reserved range is inclusive (that is, both FIRST_RESERVED_GDT_ENTRY
40 * and LAST_RESERVED_GDT_ENTRY are reserved).
42 #define NR_RESERVED_GDT_ENTRIES 72
43 #define FIRST_RESERVED_GDT_ENTRY 256
44 #define LAST_RESERVED_GDT_ENTRY \
45 (FIRST_RESERVED_GDT_ENTRY + NR_RESERVED_GDT_ENTRIES - 1)
49 * These flat segments are in the Xen-private section of every GDT. Since these
50 * are also present in the initial GDT, many OSes will be able to avoid
51 * installing their own GDT.
53 #define FLAT_RING1_CS 0x0819 /* GDT index 259 */
54 #define FLAT_RING1_DS 0x0821 /* GDT index 260 */
55 #define FLAT_RING1_SS 0x0821 /* GDT index 260 */
56 #define FLAT_RING3_CS 0x082b /* GDT index 261 */
57 #define FLAT_RING3_DS 0x0833 /* GDT index 262 */
58 #define FLAT_RING3_SS 0x0833 /* GDT index 262 */
60 #define FLAT_KERNEL_CS FLAT_RING1_CS
61 #define FLAT_KERNEL_DS FLAT_RING1_DS
62 #define FLAT_KERNEL_SS FLAT_RING1_SS
63 #define FLAT_USER_CS FLAT_RING3_CS
64 #define FLAT_USER_DS FLAT_RING3_DS
65 #define FLAT_USER_SS FLAT_RING3_SS
67 /* And the trap vector is... */
68 #define TRAP_INSTR "int $0x82"
72 * Virtual addresses beyond this are not modifiable by guest OSes. The
73 * machine->physical mapping table starts at this address, read-only.
75 #define HYPERVISOR_VIRT_START (0xFC000000UL)
76 #ifndef machine_to_phys_mapping
77 #define machine_to_phys_mapping ((u32 *)HYPERVISOR_VIRT_START)
82 /* NB. Both the following are 32 bits each. */
83 typedef unsigned long memory_t; /* Full-sized pointer/address/memory-size. */
84 typedef unsigned long cpureg_t; /* Full-sized register. */
87 * Send an array of these to HYPERVISOR_set_trap_table()
89 #define TI_GET_DPL(_ti) ((_ti)->flags & 3)
90 #define TI_GET_IF(_ti) ((_ti)->flags & 4)
91 #define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl))
92 #define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2))
94 u8 vector; /* 0: exception vector */
95 u8 flags; /* 1: 0-3: privilege level; 4: clear event enable? */
96 u16 cs; /* 2: code selector */
97 memory_t address; /* 4: code address */
98 } PACKED trap_info_t; /* 8 bytes */
100 typedef struct xen_regs
109 u16 error_code; /* private */
110 u16 entry_vector; /* private */
120 } PACKED execution_context_t;
122 typedef u64 tsc_timestamp_t; /* RDTSC timestamp */
125 * The following is all CPU context. Note that the i387_ctxt block is filled
126 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
129 #define ECF_I387_VALID (1<<0)
130 #define ECF_VMX_GUEST (1<<1)
131 #define ECF_IN_KERNEL (1<<2)
133 execution_context_t cpu_ctxt; /* User-level CPU registers */
134 char fpu_ctxt[256]; /* User-level FPU registers */
135 trap_info_t trap_ctxt[256]; /* Virtual IDT */
136 unsigned int fast_trap_idx; /* "Fast trap" vector offset */
137 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */
138 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
139 unsigned long kernel_ss, kernel_esp; /* Virtual TSS (only SS1/ESP1) */
140 unsigned long pt_base; /* CR3 (pagetable base) */
141 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */
142 unsigned long event_callback_cs; /* CS:EIP of event callback */
143 unsigned long event_callback_eip;
144 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */
145 unsigned long failsafe_callback_eip;
146 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */
147 } PACKED full_execution_context_t;
150 /* MFN of a table of MFNs that make up p2m table */
151 u64 pfn_to_mfn_frame_list;
152 } PACKED arch_shared_info_t;
155 } PACKED arch_vcpu_info_t;
157 #define ARCH_HAS_FAST_TRAP