arch/x86/include/asm/xen/interface_32.h

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/xen/interface_32.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/xen/interface_32.h
Extension
.h
Size
2993 bytes
Lines
104
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct cpu_user_regs {
    uint32_t ebx;
    uint32_t ecx;
    uint32_t edx;
    uint32_t esi;
    uint32_t edi;
    uint32_t ebp;
    uint32_t eax;
    uint16_t error_code;    /* private */
    uint16_t entry_vector;  /* private */
    uint32_t eip;
    uint16_t cs;
    uint8_t  saved_upcall_mask;
    uint8_t  _pad0;
    uint32_t eflags;        /* eflags.IF == !saved_upcall_mask */
    uint32_t esp;
    uint16_t ss, _pad1;
    uint16_t es, _pad2;
    uint16_t ds, _pad3;
    uint16_t fs, _pad4;
    uint16_t gs, _pad5;
};
DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);

typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */

struct arch_vcpu_info {
    unsigned long cr2;
    unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
};

struct xen_callback {
	unsigned long cs;
	unsigned long eip;
};
typedef struct xen_callback xen_callback_t;

#define XEN_CALLBACK(__cs, __eip)				\
	((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) })
#endif /* !__ASSEMBLER__ */


/*
 * Page-directory addresses above 4GB do not fit into architectural %cr3.
 * When accessing %cr3, or equivalent field in vcpu_guest_context, guests
 * must use the following accessor macros to pack/unpack valid MFNs.
 *
 * Note that Xen is using the fact that the pagetable base is always
 * page-aligned, and putting the 12 MSB of the address into the 12 LSB
 * of cr3.
 */
#define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
#define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))

#endif /* _ASM_X86_XEN_INTERFACE_32_H */

Annotation

Implementation Notes