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103 lines
2.9 KiB
103 lines
2.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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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* Copyright (c) 2004, K A Fraser |
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*/ |
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#ifndef _ASM_X86_XEN_INTERFACE_32_H |
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#define _ASM_X86_XEN_INTERFACE_32_H |
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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 0xe019 /* GDT index 259 */ |
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#define FLAT_RING1_DS 0xe021 /* GDT index 260 */ |
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#define FLAT_RING1_SS 0xe021 /* GDT index 260 */ |
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#define FLAT_RING3_CS 0xe02b /* GDT index 261 */ |
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#define FLAT_RING3_DS 0xe033 /* GDT index 262 */ |
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#define FLAT_RING3_SS 0xe033 /* GDT index 262 */ |
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#define FLAT_KERNEL_CS FLAT_RING1_CS |
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#define FLAT_KERNEL_DS FLAT_RING1_DS |
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#define FLAT_KERNEL_SS FLAT_RING1_SS |
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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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#define FLAT_USER_SS FLAT_RING3_SS |
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/* And the trap vector is... */ |
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#define TRAP_INSTR "int $0x82" |
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#define __MACH2PHYS_VIRT_START 0xF5800000 |
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#define __MACH2PHYS_VIRT_END 0xF6800000 |
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#define __MACH2PHYS_SHIFT 2 |
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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 0xF5800000 |
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#ifndef __ASSEMBLY__ |
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struct cpu_user_regs { |
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uint32_t ebx; |
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uint32_t ecx; |
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uint32_t edx; |
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uint32_t esi; |
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uint32_t edi; |
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uint32_t ebp; |
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uint32_t eax; |
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uint16_t error_code; /* private */ |
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uint16_t entry_vector; /* private */ |
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uint32_t eip; |
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uint16_t cs; |
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uint8_t saved_upcall_mask; |
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uint8_t _pad0; |
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uint32_t eflags; /* eflags.IF == !saved_upcall_mask */ |
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uint32_t esp; |
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uint16_t ss, _pad1; |
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uint16_t es, _pad2; |
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uint16_t ds, _pad3; |
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uint16_t fs, _pad4; |
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uint16_t gs, _pad5; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs); |
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typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ |
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struct arch_vcpu_info { |
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unsigned long cr2; |
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unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */ |
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}; |
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struct xen_callback { |
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unsigned long cs; |
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unsigned long eip; |
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}; |
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typedef struct xen_callback xen_callback_t; |
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#define XEN_CALLBACK(__cs, __eip) \ |
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((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) }) |
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#endif /* !__ASSEMBLY__ */ |
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/* |
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* Page-directory addresses above 4GB do not fit into architectural %cr3. |
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* When accessing %cr3, or equivalent field in vcpu_guest_context, guests |
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* must use the following accessor macros to pack/unpack valid MFNs. |
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* |
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* Note that Xen is using the fact that the pagetable base is always |
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* page-aligned, and putting the 12 MSB of the address into the 12 LSB |
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* of cr3. |
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*/ |
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#define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) |
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#define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) |
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#endif /* _ASM_X86_XEN_INTERFACE_32_H */
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