213 lines
7.0 KiB
C
213 lines
7.0 KiB
C
/******************************************************************************
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* xen-x86_64.h
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*
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* Guest OS interface to x86 64-bit Xen.
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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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* Copyright (c) 2004-2006, K A Fraser
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*/
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#ifndef __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__
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#define __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__
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/*
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* Hypercall interface:
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* Input: %rdi, %rsi, %rdx, %r10, %r8 (arguments 1-5)
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* Output: %rax
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* Access is via hypercall page (set up by guest loader or via a Xen MSR):
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* call hypercall_page + hypercall-number * 32
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* Clobbered: argument registers (e.g., 2-arg hypercall clobbers %rdi,%rsi)
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*/
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#if __XEN_INTERFACE_VERSION__ < 0x00030203
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/*
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* Legacy hypercall interface:
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* As above, except the entry sequence to the hypervisor is:
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* mov $hypercall-number*32,%eax ; syscall
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* Clobbered: %rcx, %r11, argument registers (as above)
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*/
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#define TRAP_INSTR "syscall"
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#endif
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/*
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* 64-bit segment selectors
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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_RING3_CS32 0xe023 /* GDT index 260 */
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#define FLAT_RING3_CS64 0xe033 /* GDT index 261 */
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#define FLAT_RING3_DS32 0xe02b /* GDT index 262 */
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#define FLAT_RING3_DS64 0x0000 /* NULL selector */
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#define FLAT_RING3_SS32 0xe02b /* GDT index 262 */
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#define FLAT_RING3_SS64 0xe02b /* GDT index 262 */
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#define FLAT_KERNEL_DS64 FLAT_RING3_DS64
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#define FLAT_KERNEL_DS32 FLAT_RING3_DS32
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#define FLAT_KERNEL_DS FLAT_KERNEL_DS64
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#define FLAT_KERNEL_CS64 FLAT_RING3_CS64
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#define FLAT_KERNEL_CS32 FLAT_RING3_CS32
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#define FLAT_KERNEL_CS FLAT_KERNEL_CS64
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#define FLAT_KERNEL_SS64 FLAT_RING3_SS64
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#define FLAT_KERNEL_SS32 FLAT_RING3_SS32
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#define FLAT_KERNEL_SS FLAT_KERNEL_SS64
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#define FLAT_USER_DS64 FLAT_RING3_DS64
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#define FLAT_USER_DS32 FLAT_RING3_DS32
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#define FLAT_USER_DS FLAT_USER_DS64
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#define FLAT_USER_CS64 FLAT_RING3_CS64
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#define FLAT_USER_CS32 FLAT_RING3_CS32
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#define FLAT_USER_CS FLAT_USER_CS64
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#define FLAT_USER_SS64 FLAT_RING3_SS64
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#define FLAT_USER_SS32 FLAT_RING3_SS32
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#define FLAT_USER_SS FLAT_USER_SS64
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#define __HYPERVISOR_VIRT_START 0xFFFF800000000000
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#define __HYPERVISOR_VIRT_END 0xFFFF880000000000
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#define __MACH2PHYS_VIRT_START 0xFFFF800000000000
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#define __MACH2PHYS_VIRT_END 0xFFFF804000000000
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#ifndef HYPERVISOR_VIRT_START
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#define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
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#define HYPERVISOR_VIRT_END mk_unsigned_long(__HYPERVISOR_VIRT_END)
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#endif
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#define MACH2PHYS_VIRT_START mk_unsigned_long(__MACH2PHYS_VIRT_START)
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#define MACH2PHYS_VIRT_END mk_unsigned_long(__MACH2PHYS_VIRT_END)
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#define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>3)
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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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/*
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* int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
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* @which == SEGBASE_* ; @base == 64-bit base address
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* Returns 0 on success.
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*/
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#define SEGBASE_FS 0
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#define SEGBASE_GS_USER 1
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#define SEGBASE_GS_KERNEL 2
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#define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
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/*
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* int HYPERVISOR_iret(void)
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* All arguments are on the kernel stack, in the following format.
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* Never returns if successful. Current kernel context is lost.
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* The saved CS is mapped as follows:
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* RING0 -> RING3 kernel mode.
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* RING1 -> RING3 kernel mode.
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* RING2 -> RING3 kernel mode.
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* RING3 -> RING3 user mode.
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* However RING0 indicates that the guest kernel should return to iteself
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* directly with
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* orb $3,1*8(%rsp)
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* iretq
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* If flags contains VGCF_in_syscall:
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* Restore RAX, RIP, RFLAGS, RSP.
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* Discard R11, RCX, CS, SS.
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* Otherwise:
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* Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
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* All other registers are saved on hypercall entry and restored to user.
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*/
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/* Guest exited in SYSCALL context? Return to guest with SYSRET? */
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#define _VGCF_in_syscall 8
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#define VGCF_in_syscall (1<<_VGCF_in_syscall)
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#define VGCF_IN_SYSCALL VGCF_in_syscall
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#ifndef __ASSEMBLY__
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struct iret_context {
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/* Top of stack (%rsp at point of hypercall). */
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uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
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/* Bottom of iret stack frame. */
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};
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
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/* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
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#define __DECL_REG(name) union { \
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uint64_t r ## name, e ## name; \
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uint32_t _e ## name; \
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}
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#else
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/* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
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#define __DECL_REG(name) uint64_t r ## name
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#endif
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struct cpu_user_regs {
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uint64_t r15;
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uint64_t r14;
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uint64_t r13;
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uint64_t r12;
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__DECL_REG(bp);
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__DECL_REG(bx);
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uint64_t r11;
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uint64_t r10;
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uint64_t r9;
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uint64_t r8;
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__DECL_REG(ax);
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__DECL_REG(cx);
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__DECL_REG(dx);
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__DECL_REG(si);
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__DECL_REG(di);
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uint32_t error_code; /* private */
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uint32_t entry_vector; /* private */
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__DECL_REG(ip);
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uint16_t cs, _pad0[1];
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uint8_t saved_upcall_mask;
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uint8_t _pad1[3];
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__DECL_REG(flags); /* rflags.IF == !saved_upcall_mask */
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__DECL_REG(sp);
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uint16_t ss, _pad2[3];
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uint16_t es, _pad3[3];
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uint16_t ds, _pad4[3];
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uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base. */
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uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
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};
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typedef struct cpu_user_regs cpu_user_regs_t;
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DEFINE_XEN_GUEST_HANDLE(cpu_user_regs_t);
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#undef __DECL_REG
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#define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
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#define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
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struct arch_vcpu_info {
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unsigned long cr2;
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unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
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};
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typedef struct arch_vcpu_info arch_vcpu_info_t;
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typedef unsigned long xen_callback_t;
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#endif /* !__ASSEMBLY__ */
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#endif /* __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__ */
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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