1 /* Architecture specific portion of the lguest hypercalls */
2 #ifndef _X86_LGUEST_HCALL_H
3 #define _X86_LGUEST_HCALL_H
5 #define LHCALL_FLUSH_ASYNC 0
6 #define LHCALL_LGUEST_INIT 1
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
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
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.
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.
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
38 #include <asm/hw_irq.h>
40 static inline unsigned long
41 hcall(unsigned long call,
42 unsigned long arg1, unsigned long arg2, unsigned long arg3)
44 /* "int" is the Intel instruction to trigger a trap. */
45 asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
46 /* The call is in %eax (aka "a"), and can be replaced */
48 /* The other arguments are in %eax, %edx, %ebx & %ecx */
49 : "a"(call), "d"(arg1), "b"(arg2), "c"(arg3)
50 /* "memory" means this might write somewhere in memory.
51 * This isn't true for all calls, but it's safe to tell
52 * gcc that it might happen so it doesn't get clever. */
58 void async_hcall(unsigned long call,
59 unsigned long arg1, unsigned long arg2, unsigned long arg3);
61 /* Can't use our min() macro here: needs to be a constant */
62 #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
64 #define LHCALL_RING_SIZE 64
67 /* These map directly onto eax, ebx, ecx, edx in struct lguest_regs */
68 unsigned long arg0, arg2, arg3, arg1;
71 #endif /* !__ASSEMBLY__ */
72 #endif /* _I386_LGUEST_HCALL_H */