1 /* Architecture specific portion of the lguest hypercalls */
2 #ifndef _X86_LGUEST_HCALL_H
3 #define _X86_LGUEST_HCALL_H
5 #define LHCALL_FLUSH_ASYNC 0
6 #define LHCALL_LGUEST_INIT 1
7 #define LHCALL_SHUTDOWN 2
8 #define LHCALL_LOAD_GDT 3
9 #define LHCALL_NEW_PGTABLE 4
10 #define LHCALL_FLUSH_TLB 5
11 #define LHCALL_LOAD_IDT_ENTRY 6
12 #define LHCALL_SET_STACK 7
14 #define LHCALL_SET_CLOCKEVENT 9
15 #define LHCALL_HALT 10
16 #define LHCALL_SET_PTE 14
17 #define LHCALL_SET_PMD 15
18 #define LHCALL_LOAD_TLS 16
19 #define LHCALL_NOTIFY 17
21 #define LGUEST_TRAP_ENTRY 0x1F
23 /* Argument number 3 to LHCALL_LGUEST_SHUTDOWN */
24 #define LGUEST_SHUTDOWN_POWEROFF 1
25 #define LGUEST_SHUTDOWN_RESTART 2
28 #include <asm/hw_irq.h>
30 /*G:031 First, how does our Guest contact the Host to ask for privileged
31 * operations? There are two ways: the direct way is to make a "hypercall",
32 * to make requests of the Host Itself.
34 * Our hypercall mechanism uses the highest unused trap code (traps 32 and
35 * above are used by real hardware interrupts). Fifteen hypercalls are
36 * available: the hypercall number is put in the %eax register, and the
37 * arguments (when required) are placed in %edx, %ebx and %ecx. If a return
38 * value makes sense, it's returned in %eax.
40 * Grossly invalid calls result in Sudden Death at the hands of the vengeful
41 * Host, rather than returning failure. This reflects Winston Churchill's
42 * definition of a gentleman: "someone who is only rude intentionally". */
43 static inline unsigned long
44 hcall(unsigned long call
,
45 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
)
47 /* "int" is the Intel instruction to trigger a trap. */
48 asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY
)
49 /* The call in %eax (aka "a") might be overwritten */
51 /* The arguments are in %eax, %edx, %ebx & %ecx */
52 : "a"(call
), "d"(arg1
), "b"(arg2
), "c"(arg3
)
53 /* "memory" means this might write somewhere in memory.
54 * This isn't true for all calls, but it's safe to tell
55 * gcc that it might happen so it doesn't get clever. */
61 /* Can't use our min() macro here: needs to be a constant */
62 #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
64 #define LHCALL_RING_SIZE 64
67 /* These map directly onto eax, ebx, ecx, edx in struct lguest_regs */
68 unsigned long arg0
, arg2
, arg3
, arg1
;
71 #endif /* !__ASSEMBLY__ */
72 #endif /* _I386_LGUEST_HCALL_H */
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