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Jes Sorensenc37ae932007-10-22 10:56:26 +10001/* Architecture specific portion of the lguest hypercalls */
H. Peter Anvin1965aae2008-10-22 22:26:29 -07002#ifndef _ASM_X86_LGUEST_HCALL_H
3#define _ASM_X86_LGUEST_HCALL_H
Jes Sorensenc37ae932007-10-22 10:56:26 +10004
5#define LHCALL_FLUSH_ASYNC 0
6#define LHCALL_LGUEST_INIT 1
Balaji Raoec04b132007-12-28 14:26:24 +05307#define LHCALL_SHUTDOWN 2
Jes Sorensenc37ae932007-10-22 10:56:26 +10008#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
Matias Zabaljaureguiacdd0b62009-06-12 22:27:07 -060015#define LHCALL_SET_PMD 13
Jes Sorensenc37ae932007-10-22 10:56:26 +100016#define LHCALL_SET_PTE 14
Matias Zabaljaureguiebe0ba82009-05-30 15:48:08 -030017#define LHCALL_SET_PGD 15
Jes Sorensenc37ae932007-10-22 10:56:26 +100018#define LHCALL_LOAD_TLS 16
Rusty Russell15045272007-10-22 11:24:10 +100019#define LHCALL_NOTIFY 17
Rusty Russella489f0b2009-04-19 23:14:00 -060020#define LHCALL_LOAD_GDT_ENTRY 18
Rusty Russella32a88132009-06-12 22:27:02 -060021#define LHCALL_SEND_INTERRUPTS 19
Jes Sorensenc37ae932007-10-22 10:56:26 +100022
Rusty Russelle1e72962007-10-25 15:02:50 +100023#define LGUEST_TRAP_ENTRY 0x1F
24
Balaji Raoec04b132007-12-28 14:26:24 +053025/* Argument number 3 to LHCALL_LGUEST_SHUTDOWN */
26#define LGUEST_SHUTDOWN_POWEROFF 1
27#define LGUEST_SHUTDOWN_RESTART 2
28
Rusty Russelle1e72962007-10-25 15:02:50 +100029#ifndef __ASSEMBLY__
30#include <asm/hw_irq.h>
31
Rusty Russell2e04ef72009-07-30 16:03:45 -060032/*G:030
33 * But first, how does our Guest contact the Host to ask for privileged
Jes Sorensenc37ae932007-10-22 10:56:26 +100034 * operations? There are two ways: the direct way is to make a "hypercall",
35 * to make requests of the Host Itself.
36 *
Rusty Russell091ebf02010-04-14 21:43:54 -060037 * 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.
Jes Sorensenc37ae932007-10-22 10:56:26 +100042 *
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
Rusty Russell2e04ef72009-07-30 16:03:45 -060045 * definition of a gentleman: "someone who is only rude intentionally".
Rusty Russell091ebf02010-04-14 21:43:54 -060046 */
47static inline unsigned long
48hcall(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}
Jes Sorensenc37ae932007-10-22 10:56:26 +100064
Jes Sorensenc37ae932007-10-22 10:56:26 +100065/* Can't use our min() macro here: needs to be a constant */
66#define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
67
68#define LHCALL_RING_SIZE 64
Joe Perchesfd1ea0c2008-03-23 01:02:36 -070069struct hcall_args {
Rusty Russell2e04ef72009-07-30 16:03:45 -060070 /* These map directly onto eax/ebx/ecx/edx/esi in struct lguest_regs */
Matias Zabaljaureguicefcad12009-06-12 22:27:07 -060071 unsigned long arg0, arg1, arg2, arg3, arg4;
Jes Sorensenc37ae932007-10-22 10:56:26 +100072};
Rusty Russell47436aa2007-10-22 11:03:36 +100073
74#endif /* !__ASSEMBLY__ */
H. Peter Anvin1965aae2008-10-22 22:26:29 -070075#endif /* _ASM_X86_LGUEST_HCALL_H */