Commit | Line | Data |
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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 | |
c37ae93d JS |
16 | #define LHCALL_SET_PTE 14 |
17 | #define LHCALL_SET_PMD 15 | |
18 | #define LHCALL_LOAD_TLS 16 | |
15045275 | 19 | #define LHCALL_NOTIFY 17 |
c37ae93d | 20 | |
e1e72965 RR |
21 | #define LGUEST_TRAP_ENTRY 0x1F |
22 | ||
23 | #ifndef __ASSEMBLY__ | |
24 | #include <asm/hw_irq.h> | |
25 | ||
c37ae93d JS |
26 | /*G:031 First, how does our Guest contact the Host to ask for privileged |
27 | * operations? There are two ways: the direct way is to make a "hypercall", | |
28 | * to make requests of the Host Itself. | |
29 | * | |
30 | * Our hypercall mechanism uses the highest unused trap code (traps 32 and | |
e1e72965 | 31 | * above are used by real hardware interrupts). Fifteen hypercalls are |
c37ae93d JS |
32 | * available: the hypercall number is put in the %eax register, and the |
33 | * arguments (when required) are placed in %edx, %ebx and %ecx. If a return | |
34 | * value makes sense, it's returned in %eax. | |
35 | * | |
36 | * Grossly invalid calls result in Sudden Death at the hands of the vengeful | |
37 | * Host, rather than returning failure. This reflects Winston Churchill's | |
38 | * definition of a gentleman: "someone who is only rude intentionally". */ | |
c37ae93d JS |
39 | static inline unsigned long |
40 | hcall(unsigned long call, | |
41 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
42 | { | |
43 | /* "int" is the Intel instruction to trigger a trap. */ | |
44 | asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY) | |
e1e72965 | 45 | /* The call in %eax (aka "a") might be overwritten */ |
c37ae93d | 46 | : "=a"(call) |
e1e72965 | 47 | /* The arguments are in %eax, %edx, %ebx & %ecx */ |
c37ae93d JS |
48 | : "a"(call), "d"(arg1), "b"(arg2), "c"(arg3) |
49 | /* "memory" means this might write somewhere in memory. | |
50 | * This isn't true for all calls, but it's safe to tell | |
51 | * gcc that it might happen so it doesn't get clever. */ | |
52 | : "memory"); | |
53 | return call; | |
54 | } | |
55 | /*:*/ | |
56 | ||
57 | void async_hcall(unsigned long call, | |
58 | unsigned long arg1, unsigned long arg2, unsigned long arg3); | |
59 | ||
60 | /* Can't use our min() macro here: needs to be a constant */ | |
61 | #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32) | |
62 | ||
63 | #define LHCALL_RING_SIZE 64 | |
b410e7b1 | 64 | struct hcall_args |
c37ae93d | 65 | { |
b410e7b1 JS |
66 | /* These map directly onto eax, ebx, ecx, edx in struct lguest_regs */ |
67 | unsigned long arg0, arg2, arg3, arg1; | |
c37ae93d | 68 | }; |
47436aa4 RR |
69 | |
70 | #endif /* !__ASSEMBLY__ */ | |
c37ae93d | 71 | #endif /* _I386_LGUEST_HCALL_H */ |