mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 20:51:47 +00:00
9f54288def
Also removes a long-unused #define and an extraneous semicolon. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/* Architecture specific portion of the lguest hypercalls */
|
|
#ifndef _ASM_X86_LGUEST_HCALL_H
|
|
#define _ASM_X86_LGUEST_HCALL_H
|
|
|
|
#define LHCALL_FLUSH_ASYNC 0
|
|
#define LHCALL_LGUEST_INIT 1
|
|
#define LHCALL_SHUTDOWN 2
|
|
#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_PMD 13
|
|
#define LHCALL_SET_PTE 14
|
|
#define LHCALL_SET_PGD 15
|
|
#define LHCALL_LOAD_TLS 16
|
|
#define LHCALL_NOTIFY 17
|
|
#define LHCALL_LOAD_GDT_ENTRY 18
|
|
#define LHCALL_SEND_INTERRUPTS 19
|
|
|
|
#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:030
|
|
* 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). Seventeen hypercalls are
|
|
* available: the hypercall number is put in the %eax register, and the
|
|
* arguments (when required) are placed in %ebx, %ecx, %edx and %esi.
|
|
* 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,
|
|
unsigned long arg4)
|
|
{
|
|
/* "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, %ebx, %ecx, %edx & %esi */
|
|
: "a"(call), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4)
|
|
/* "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/esi in struct lguest_regs */
|
|
unsigned long arg0, arg1, arg2, arg3, arg4;
|
|
};
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* _ASM_X86_LGUEST_HCALL_H */
|