| 1 | /* |
| 2 | * Things the lguest guest needs to know. Note: like all lguest interfaces, |
| 3 | * this is subject to wild and random change between versions. |
| 4 | */ |
| 5 | #ifndef _LINUX_LGUEST_H |
| 6 | #define _LINUX_LGUEST_H |
| 7 | |
| 8 | #ifndef __ASSEMBLY__ |
| 9 | #include <linux/time.h> |
| 10 | #include <asm/irq.h> |
| 11 | #include <asm/lguest_hcall.h> |
| 12 | |
| 13 | #define LG_CLOCK_MIN_DELTA 100UL |
| 14 | #define LG_CLOCK_MAX_DELTA ULONG_MAX |
| 15 | |
| 16 | /*G:031 |
| 17 | * The second method of communicating with the Host is to via "struct |
| 18 | * lguest_data". Once the Guest's initialization hypercall tells the Host where |
| 19 | * this is, the Guest and Host both publish information in it. |
| 20 | :*/ |
| 21 | struct lguest_data { |
| 22 | /* |
| 23 | * 512 == enabled (same as eflags in normal hardware). The Guest |
| 24 | * changes interrupts so often that a hypercall is too slow. |
| 25 | */ |
| 26 | unsigned int irq_enabled; |
| 27 | /* Fine-grained interrupt disabling by the Guest */ |
| 28 | DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS); |
| 29 | |
| 30 | /* |
| 31 | * The Host writes the virtual address of the last page fault here, |
| 32 | * which saves the Guest a hypercall. CR2 is the native register where |
| 33 | * this address would normally be found. |
| 34 | */ |
| 35 | unsigned long cr2; |
| 36 | |
| 37 | /* Wallclock time set by the Host. */ |
| 38 | struct timespec time; |
| 39 | |
| 40 | /* |
| 41 | * Interrupt pending set by the Host. The Guest should do a hypercall |
| 42 | * if it re-enables interrupts and sees this set (to X86_EFLAGS_IF). |
| 43 | */ |
| 44 | int irq_pending; |
| 45 | |
| 46 | /* |
| 47 | * Async hypercall ring. Instead of directly making hypercalls, we can |
| 48 | * place them in here for processing the next time the Host wants. |
| 49 | * This batching can be quite efficient. |
| 50 | */ |
| 51 | |
| 52 | /* 0xFF == done (set by Host), 0 == pending (set by Guest). */ |
| 53 | u8 hcall_status[LHCALL_RING_SIZE]; |
| 54 | /* The actual registers for the hypercalls. */ |
| 55 | struct hcall_args hcalls[LHCALL_RING_SIZE]; |
| 56 | |
| 57 | /* Fields initialized by the Host at boot: */ |
| 58 | /* Memory not to try to access */ |
| 59 | unsigned long reserve_mem; |
| 60 | /* KHz for the TSC clock. */ |
| 61 | u32 tsc_khz; |
| 62 | |
| 63 | /* Fields initialized by the Guest at boot: */ |
| 64 | /* Instruction range to suppress interrupts even if enabled */ |
| 65 | unsigned long noirq_start, noirq_end; |
| 66 | /* Address above which page tables are all identical. */ |
| 67 | unsigned long kernel_address; |
| 68 | /* The vector to try to use for system calls (0x40 or 0x80). */ |
| 69 | unsigned int syscall_vec; |
| 70 | }; |
| 71 | extern struct lguest_data lguest_data; |
| 72 | #endif /* __ASSEMBLY__ */ |
| 73 | #endif /* _LINUX_LGUEST_H */ |