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c37ae93d JS |
1 | /* Architecture specific portion of the lguest hypercalls */ |
2 | #ifndef _X86_LGUEST_HCALL_H | |
3 | #define _X86_LGUEST_HCALL_H | |
4 | ||
5 | #define LHCALL_FLUSH_ASYNC 0 | |
6 | #define LHCALL_LGUEST_INIT 1 | |
7 | #define LHCALL_CRASH 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 | |
13 | #define LHCALL_TS 8 | |
14 | #define LHCALL_SET_CLOCKEVENT 9 | |
15 | #define LHCALL_HALT 10 | |
16 | #define LHCALL_BIND_DMA 12 | |
17 | #define LHCALL_SEND_DMA 13 | |
18 | #define LHCALL_SET_PTE 14 | |
19 | #define LHCALL_SET_PMD 15 | |
20 | #define LHCALL_LOAD_TLS 16 | |
21 | ||
22 | /*G:031 First, how does our Guest contact the Host to ask for privileged | |
23 | * operations? There are two ways: the direct way is to make a "hypercall", | |
24 | * to make requests of the Host Itself. | |
25 | * | |
26 | * Our hypercall mechanism uses the highest unused trap code (traps 32 and | |
27 | * above are used by real hardware interrupts). Seventeen hypercalls are | |
28 | * available: the hypercall number is put in the %eax register, and the | |
29 | * arguments (when required) are placed in %edx, %ebx and %ecx. If a return | |
30 | * value makes sense, it's returned in %eax. | |
31 | * | |
32 | * Grossly invalid calls result in Sudden Death at the hands of the vengeful | |
33 | * Host, rather than returning failure. This reflects Winston Churchill's | |
34 | * definition of a gentleman: "someone who is only rude intentionally". */ | |
35 | #define LGUEST_TRAP_ENTRY 0x1F | |
36 | ||
37 | static inline unsigned long | |
38 | hcall(unsigned long call, | |
39 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
40 | { | |
41 | /* "int" is the Intel instruction to trigger a trap. */ | |
42 | asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY) | |
43 | /* The call is in %eax (aka "a"), and can be replaced */ | |
44 | : "=a"(call) | |
45 | /* The other arguments are in %eax, %edx, %ebx & %ecx */ | |
46 | : "a"(call), "d"(arg1), "b"(arg2), "c"(arg3) | |
47 | /* "memory" means this might write somewhere in memory. | |
48 | * This isn't true for all calls, but it's safe to tell | |
49 | * gcc that it might happen so it doesn't get clever. */ | |
50 | : "memory"); | |
51 | return call; | |
52 | } | |
53 | /*:*/ | |
54 | ||
55 | void async_hcall(unsigned long call, | |
56 | unsigned long arg1, unsigned long arg2, unsigned long arg3); | |
57 | ||
58 | /* Can't use our min() macro here: needs to be a constant */ | |
59 | #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32) | |
60 | ||
61 | #define LHCALL_RING_SIZE 64 | |
62 | struct hcall_ring | |
63 | { | |
64 | u32 eax, edx, ebx, ecx; | |
65 | }; | |
66 | ||
67 | #endif /* _I386_LGUEST_HCALL_H */ |