mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 04:11:49 +00:00
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/* Architecture specific portion of the lguest hypercalls */
|
|
#ifndef _X86_LGUEST_HCALL_H
|
|
#define _X86_LGUEST_HCALL_H
|
|
|
|
#define LHCALL_FLUSH_ASYNC 0
|
|
#define LHCALL_LGUEST_INIT 1
|
|
#define LHCALL_SHUTDOWN 2
|
|
#define LHCALL_LOAD_GDT 3
|
|
#define LHCALL_NEW_PGTABLE 4
|
|
#define LHCALL_FLUSH_TLB 5
|
|
#define LHCALL_LOAD_IDT_ENTRY 6
|
|
#define LHCALL_SET_STACK 7
|
|
#define LHCALL_TS 8
|
|
#define LHCALL_SET_CLOCKEVENT 9
|
|
#define LHCALL_HALT 10
|
|
#define LHCALL_SET_PTE 14
|
|
#define LHCALL_SET_PMD 15
|
|
#define LHCALL_LOAD_TLS 16
|
|
#define LHCALL_NOTIFY 17
|
|
|
|
#define LGUEST_TRAP_ENTRY 0x1F
|
|
|
|
/* Argument number 3 to LHCALL_LGUEST_SHUTDOWN */
|
|
#define LGUEST_SHUTDOWN_POWEROFF 1
|
|
#define LGUEST_SHUTDOWN_RESTART 2
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/hw_irq.h>
|
|
|
|
/*G:031 But first, how does our Guest contact the Host to ask for privileged
|
|
* operations? There are two ways: the direct way is to make a "hypercall",
|
|
* to make requests of the Host Itself.
|
|
*
|
|
* Our hypercall mechanism uses the highest unused trap code (traps 32 and
|
|
* above are used by real hardware interrupts). Fifteen hypercalls are
|
|
* available: the hypercall number is put in the %eax register, and the
|
|
* arguments (when required) are placed in %edx, %ebx and %ecx. If a return
|
|
* value makes sense, it's returned in %eax.
|
|
*
|
|
* Grossly invalid calls result in Sudden Death at the hands of the vengeful
|
|
* Host, rather than returning failure. This reflects Winston Churchill's
|
|
* definition of a gentleman: "someone who is only rude intentionally". */
|
|
static inline unsigned long
|
|
hcall(unsigned long call,
|
|
unsigned long arg1, unsigned long arg2, unsigned long arg3)
|
|
{
|
|
/* "int" is the Intel instruction to trigger a trap. */
|
|
asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
|
|
/* The call in %eax (aka "a") might be overwritten */
|
|
: "=a"(call)
|
|
/* The arguments are in %eax, %edx, %ebx & %ecx */
|
|
: "a"(call), "d"(arg1), "b"(arg2), "c"(arg3)
|
|
/* "memory" means this might write somewhere in memory.
|
|
* This isn't true for all calls, but it's safe to tell
|
|
* gcc that it might happen so it doesn't get clever. */
|
|
: "memory");
|
|
return call;
|
|
}
|
|
/*:*/
|
|
|
|
/* Can't use our min() macro here: needs to be a constant */
|
|
#define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
|
|
|
|
#define LHCALL_RING_SIZE 64
|
|
struct hcall_args {
|
|
/* These map directly onto eax, ebx, ecx, edx in struct lguest_regs */
|
|
unsigned long arg0, arg2, arg3, arg1;
|
|
};
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* _I386_LGUEST_HCALL_H */
|