| /* 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_CRASH 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_BIND_DMA 12 |
| #define LHCALL_SEND_DMA 13 |
| #define LHCALL_SET_PTE 14 |
| #define LHCALL_SET_PMD 15 |
| #define LHCALL_LOAD_TLS 16 |
| |
| /*G:031 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 %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". */ |
| #define LGUEST_TRAP_ENTRY 0x1F |
| |
| #ifndef __ASSEMBLY__ |
| #include <asm/hw_irq.h> |
| |
| 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 is in %eax (aka "a"), and can be replaced */ |
| : "=a"(call) |
| /* The other 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; |
| } |
| /*:*/ |
| |
| void async_hcall(unsigned long call, |
| unsigned long arg1, unsigned long arg2, unsigned long arg3); |
| |
| /* 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 */ |