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authorJes Sorensen <jes@sgi.com>2007-10-21 20:56:26 -0400
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 01:49:49 -0400
commitc37ae93d597fc63bae979db76b527dcc7740dc9d (patch)
tree2ac25ff96a42593b536d4cdb10f5cbfdb96ef347 /include/asm-x86/lguest_hcall.h
parent05aa026a62d0fe0b4664a01d1537984b12567e7c (diff)
Move lguest hcalls to arch-specific header
Move architecture specific portion of lg_hcall code to asm-i386/lg_hcall.h and have it included from linux/lguest.h. [Changed to asm-i386/lguest_hcall.h so documentation finds it -RR] Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Jes Sorensen <jes@sgi.com>
Diffstat (limited to 'include/asm-x86/lguest_hcall.h')
-rw-r--r--include/asm-x86/lguest_hcall.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/include/asm-x86/lguest_hcall.h b/include/asm-x86/lguest_hcall.h
new file mode 100644
index 000000000000..7859cfe0ebb2
--- /dev/null
+++ b/include/asm-x86/lguest_hcall.h
@@ -0,0 +1,67 @@
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
37static inline unsigned long
38hcall(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
55void 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
62struct hcall_ring
63{
64 u32 eax, edx, ebx, ecx;
65};
66
67#endif /* _I386_LGUEST_HCALL_H */