166 lines
6.1 KiB
C
166 lines
6.1 KiB
C
/* $NetBSD: arch-x86_32.h,v 1.3 2005/12/11 12:19:49 christos Exp $ */
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/*
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* Copyright (c) 2004, K A Fraser
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/******************************************************************************
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* arch-x86_32.h
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*
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* Guest OS interface to x86 32-bit Xen.
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*/
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#ifndef __XEN_PUBLIC_ARCH_X86_32_H__
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#define __XEN_PUBLIC_ARCH_X86_32_H__
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/*
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* Pointers and other address fields inside interface structures are padded to
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* 64 bits. This means that field alignments aren't different between 32- and
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* 64-bit architectures.
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*/
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/* NB. Multi-level macro ensures __LINE__ is expanded before concatenation. */
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#define __MEMORY_PADDING(_X) u32 __pad_ ## _X
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#define _MEMORY_PADDING(_X) __MEMORY_PADDING(_X)
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#define MEMORY_PADDING _MEMORY_PADDING(__LINE__)
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/*
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* SEGMENT DESCRIPTOR TABLES
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*/
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/*
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* A number of GDT entries are reserved by Xen. These are not situated at the
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* start of the GDT because some stupid OSes export hard-coded selector values
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* in their ABI. These hard-coded values are always near the start of the GDT,
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* so Xen places itself out of the way.
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*
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* NB. The reserved range is inclusive (that is, both FIRST_RESERVED_GDT_ENTRY
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* and LAST_RESERVED_GDT_ENTRY are reserved).
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*/
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#define NR_RESERVED_GDT_ENTRIES 40
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#define FIRST_RESERVED_GDT_ENTRY 256
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#define LAST_RESERVED_GDT_ENTRY \
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(FIRST_RESERVED_GDT_ENTRY + NR_RESERVED_GDT_ENTRIES - 1)
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/*
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* These flat segments are in the Xen-private section of every GDT. Since these
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* are also present in the initial GDT, many OSes will be able to avoid
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* installing their own GDT.
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*/
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#define FLAT_RING1_CS 0x0819 /* GDT index 259 */
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#define FLAT_RING1_DS 0x0821 /* GDT index 260 */
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#define FLAT_RING3_CS 0x082b /* GDT index 261 */
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#define FLAT_RING3_DS 0x0833 /* GDT index 262 */
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#define FLAT_GUESTOS_CS FLAT_RING1_CS
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#define FLAT_GUESTOS_DS FLAT_RING1_DS
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#define FLAT_USER_CS FLAT_RING3_CS
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#define FLAT_USER_DS FLAT_RING3_DS
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/* And the trap vector is... */
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#define TRAP_INSTR "int $0x82"
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/*
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* Virtual addresses beyond this are not modifiable by guest OSes. The
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* machine->physical mapping table starts at this address, read-only.
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*/
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#define HYPERVISOR_VIRT_START (0xFC000000UL)
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#ifndef machine_to_phys_mapping
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#define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START)
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#endif
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#ifndef __ASSEMBLY__
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/* NB. Both the following are 32 bits each. */
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typedef unsigned long memory_t; /* Full-sized pointer/address/memory-size. */
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typedef unsigned long cpureg_t; /* Full-sized register. */
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/*
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* Send an array of these to HYPERVISOR_set_trap_table()
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*/
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#define TI_GET_DPL(_ti) ((_ti)->flags & 3)
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#define TI_GET_IF(_ti) ((_ti)->flags & 4)
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#define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl))
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#define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2))
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typedef struct {
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u8 vector; /* 0: exception vector */
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u8 flags; /* 1: 0-3: privilege level; 4: clear event enable? */
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u16 cs; /* 2: code selector */
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memory_t address; /* 4: code address */
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} PACKED trap_info_t; /* 8 bytes */
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typedef struct
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{
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unsigned long ebx;
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unsigned long ecx;
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unsigned long edx;
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unsigned long esi;
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unsigned long edi;
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unsigned long ebp;
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unsigned long eax;
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unsigned long _unused;
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unsigned long eip;
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unsigned long cs;
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unsigned long eflags;
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unsigned long esp;
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unsigned long ss;
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unsigned long es;
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unsigned long ds;
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unsigned long fs;
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unsigned long gs;
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} PACKED execution_context_t;
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typedef u64 tsc_timestamp_t; /* RDTSC timestamp */
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/*
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* The following is all CPU context. Note that the i387_ctxt block is filled
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* in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
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*/
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typedef struct {
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#define ECF_I387_VALID (1<<0)
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unsigned long flags;
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execution_context_t cpu_ctxt; /* User-level CPU registers */
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char fpu_ctxt[256]; /* User-level FPU registers */
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trap_info_t trap_ctxt[256]; /* Virtual IDT */
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unsigned int fast_trap_idx; /* "Fast trap" vector offset */
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unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */
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unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
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unsigned long guestos_ss, guestos_esp; /* Virtual TSS (only SS1/ESP1) */
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unsigned long pt_base; /* CR3 (pagetable base) */
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unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */
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unsigned long event_callback_cs; /* CS:EIP of event callback */
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unsigned long event_callback_eip;
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unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */
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unsigned long failsafe_callback_eip;
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} PACKED full_execution_context_t;
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typedef struct {
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u64 mfn_to_pfn_start; /* MFN of start of m2p table */
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u64 pfn_to_mfn_frame_list; /* MFN of a table of MFNs that
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make up p2m table */
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} PACKED arch_shared_info_t;
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#define ARCH_HAS_FAST_TRAP
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#endif
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#endif
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