150 lines
4.6 KiB
C
150 lines
4.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_XEN_INTERFACE_64_H
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#define _ASM_X86_XEN_INTERFACE_64_H
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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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#define __MACH2PHYS_SHIFT 3
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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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DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
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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 unsigned long xen_callback_t;
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#define XEN_CALLBACK(__cs, __rip) \
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((unsigned long)(__rip))
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_XEN_INTERFACE_64_H */
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