diff options
| -rw-r--r-- | include/asm-x86/lguest_hcall.h | 67 | ||||
| -rw-r--r-- | include/linux/lguest.h | 69 |
2 files changed, 71 insertions, 65 deletions
diff --git a/include/asm-x86/lguest_hcall.h b/include/asm-x86/lguest_hcall.h new file mode 100644 index 00000000000..7859cfe0ebb --- /dev/null +++ b/include/asm-x86/lguest_hcall.h @@ -0,0 +1,67 @@ +/* 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 + +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_ring +{ + u32 eax, edx, ebx, ecx; +}; + +#endif /* _I386_LGUEST_HCALL_H */ diff --git a/include/linux/lguest.h b/include/linux/lguest.h index 157ad64aa7c..d4d94a127f3 100644 --- a/include/linux/lguest.h +++ b/include/linux/lguest.h @@ -1,76 +1,15 @@ /* Things the lguest guest needs to know. Note: like all lguest interfaces, * this is subject to wild and random change between versions. */ -#ifndef _ASM_LGUEST_H -#define _ASM_LGUEST_H +#ifndef _LINUX_LGUEST_H +#define _LINUX_LGUEST_H #ifndef __ASSEMBLY__ #include <asm/irq.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 +#include <asm/lguest_hcall.h> #define LG_CLOCK_MIN_DELTA 100UL #define LG_CLOCK_MAX_DELTA ULONG_MAX -/*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 - -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_ring -{ - u32 eax, edx, ebx, ecx; -}; - /*G:032 The second method of communicating with the Host is to via "struct * lguest_data". The Guest's very first hypercall is to tell the Host where * this is, and then the Guest and Host both publish information in it. :*/ @@ -113,4 +52,4 @@ struct lguest_data }; extern struct lguest_data lguest_data; #endif /* __ASSEMBLY__ */ -#endif /* _ASM_LGUEST_H */ +#endif /* _LINUX_LGUEST_H */ |