/* 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 */