Jes Sorensen | c37ae93 | 2007-10-22 10:56:26 +1000 | [diff] [blame] | 1 | /* Architecture specific portion of the lguest hypercalls */ |
| 2 | #ifndef _X86_LGUEST_HCALL_H |
| 3 | #define _X86_LGUEST_HCALL_H |
| 4 | |
| 5 | #define LHCALL_FLUSH_ASYNC 0 |
| 6 | #define LHCALL_LGUEST_INIT 1 |
| 7 | #define LHCALL_CRASH 2 |
| 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 |
| 13 | #define LHCALL_TS 8 |
| 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 |
| 21 | |
| 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. |
| 25 | * |
| 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. |
| 31 | * |
| 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 |
| 36 | |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame^] | 37 | #ifndef __ASSEMBLY__ |
| 38 | #include <asm/hw_irq.h> |
| 39 | |
Jes Sorensen | c37ae93 | 2007-10-22 10:56:26 +1000 | [diff] [blame] | 40 | static inline unsigned long |
| 41 | hcall(unsigned long call, |
| 42 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 43 | { |
| 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 */ |
| 47 | : "=a"(call) |
| 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. */ |
| 53 | : "memory"); |
| 54 | return call; |
| 55 | } |
| 56 | /*:*/ |
| 57 | |
| 58 | void async_hcall(unsigned long call, |
| 59 | unsigned long arg1, unsigned long arg2, unsigned long arg3); |
| 60 | |
| 61 | /* Can't use our min() macro here: needs to be a constant */ |
| 62 | #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32) |
| 63 | |
| 64 | #define LHCALL_RING_SIZE 64 |
Jes Sorensen | b410e7b | 2007-10-22 11:03:31 +1000 | [diff] [blame] | 65 | struct hcall_args |
Jes Sorensen | c37ae93 | 2007-10-22 10:56:26 +1000 | [diff] [blame] | 66 | { |
Jes Sorensen | b410e7b | 2007-10-22 11:03:31 +1000 | [diff] [blame] | 67 | /* These map directly onto eax, ebx, ecx, edx in struct lguest_regs */ |
| 68 | unsigned long arg0, arg2, arg3, arg1; |
Jes Sorensen | c37ae93 | 2007-10-22 10:56:26 +1000 | [diff] [blame] | 69 | }; |
Rusty Russell | 47436aa | 2007-10-22 11:03:36 +1000 | [diff] [blame^] | 70 | |
| 71 | #endif /* !__ASSEMBLY__ */ |
Jes Sorensen | c37ae93 | 2007-10-22 10:56:26 +1000 | [diff] [blame] | 72 | #endif /* _I386_LGUEST_HCALL_H */ |