Commit | Line | Data |
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c37ae93d | 1 | /* Architecture specific portion of the lguest hypercalls */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_LGUEST_HCALL_H |
3 | #define _ASM_X86_LGUEST_HCALL_H | |
c37ae93d JS |
4 | |
5 | #define LHCALL_FLUSH_ASYNC 0 | |
6 | #define LHCALL_LGUEST_INIT 1 | |
ec04b13f | 7 | #define LHCALL_SHUTDOWN 2 |
c37ae93d JS |
8 | #define LHCALL_NEW_PGTABLE 4 |
9 | #define LHCALL_FLUSH_TLB 5 | |
10 | #define LHCALL_LOAD_IDT_ENTRY 6 | |
11 | #define LHCALL_SET_STACK 7 | |
12 | #define LHCALL_TS 8 | |
13 | #define LHCALL_SET_CLOCKEVENT 9 | |
14 | #define LHCALL_HALT 10 | |
acdd0b62 | 15 | #define LHCALL_SET_PMD 13 |
c37ae93d | 16 | #define LHCALL_SET_PTE 14 |
ebe0ba84 | 17 | #define LHCALL_SET_PGD 15 |
c37ae93d | 18 | #define LHCALL_LOAD_TLS 16 |
15045275 | 19 | #define LHCALL_NOTIFY 17 |
a489f0b5 | 20 | #define LHCALL_LOAD_GDT_ENTRY 18 |
a32a8813 | 21 | #define LHCALL_SEND_INTERRUPTS 19 |
c37ae93d | 22 | |
e1e72965 RR |
23 | #define LGUEST_TRAP_ENTRY 0x1F |
24 | ||
ec04b13f BR |
25 | /* Argument number 3 to LHCALL_LGUEST_SHUTDOWN */ |
26 | #define LGUEST_SHUTDOWN_POWEROFF 1 | |
27 | #define LGUEST_SHUTDOWN_RESTART 2 | |
28 | ||
e1e72965 RR |
29 | #ifndef __ASSEMBLY__ |
30 | #include <asm/hw_irq.h> | |
31 | ||
2e04ef76 RR |
32 | /*G:030 |
33 | * But first, how does our Guest contact the Host to ask for privileged | |
c37ae93d JS |
34 | * operations? There are two ways: the direct way is to make a "hypercall", |
35 | * to make requests of the Host Itself. | |
36 | * | |
091ebf07 RR |
37 | * Our hypercall mechanism uses the highest unused trap code (traps 32 and |
38 | * above are used by real hardware interrupts). Seventeen hypercalls are | |
39 | * available: the hypercall number is put in the %eax register, and the | |
40 | * arguments (when required) are placed in %ebx, %ecx, %edx and %esi. | |
41 | * If a return value makes sense, it's returned in %eax. | |
c37ae93d JS |
42 | * |
43 | * Grossly invalid calls result in Sudden Death at the hands of the vengeful | |
44 | * Host, rather than returning failure. This reflects Winston Churchill's | |
2e04ef76 | 45 | * definition of a gentleman: "someone who is only rude intentionally". |
091ebf07 RR |
46 | */ |
47 | static inline unsigned long | |
48 | hcall(unsigned long call, | |
49 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
50 | unsigned long arg4) | |
51 | { | |
52 | /* "int" is the Intel instruction to trigger a trap. */ | |
53 | asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY) | |
54 | /* The call in %eax (aka "a") might be overwritten */ | |
55 | : "=a"(call) | |
56 | /* The arguments are in %eax, %ebx, %ecx, %edx & %esi */ | |
57 | : "a"(call), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4) | |
58 | /* "memory" means this might write somewhere in memory. | |
59 | * This isn't true for all calls, but it's safe to tell | |
60 | * gcc that it might happen so it doesn't get clever. */ | |
61 | : "memory"); | |
62 | return call; | |
63 | } | |
9f54288d | 64 | /*:*/ |
c37ae93d | 65 | |
c37ae93d JS |
66 | /* Can't use our min() macro here: needs to be a constant */ |
67 | #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32) | |
68 | ||
69 | #define LHCALL_RING_SIZE 64 | |
fd1ea0c2 | 70 | struct hcall_args { |
2e04ef76 | 71 | /* These map directly onto eax/ebx/ecx/edx/esi in struct lguest_regs */ |
cefcad17 | 72 | unsigned long arg0, arg1, arg2, arg3, arg4; |
c37ae93d | 73 | }; |
47436aa4 RR |
74 | |
75 | #endif /* !__ASSEMBLY__ */ | |
1965aae3 | 76 | #endif /* _ASM_X86_LGUEST_HCALL_H */ |