1 files changed, 73 insertions, 0 deletions
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
new file mode 100644
index 000000000..6db19f35f
--- /dev/null
+++ b/include/linux/lguest.h
@@ -0,0 +1,73 @@
+/*
+ * Things the lguest guest needs to know.  Note: like all lguest interfaces,
+ * this is subject to wild and random change between versions.
+ */
+#ifndef _LINUX_LGUEST_H
+#define _LINUX_LGUEST_H
+
+#ifndef __ASSEMBLY__
+#include <linux/time.h>
+#include <asm/irq.h>
+#include <asm/lguest_hcall.h>
+
+#define LG_CLOCK_MIN_DELTA	100UL
+#define LG_CLOCK_MAX_DELTA	ULONG_MAX
+
+/*G:031
+ * The second method of communicating with the Host is to via "struct
+ * lguest_data".  Once the Guest's initialization hypercall tells the Host where
+ * this is, the Guest and Host both publish information in it.
+:*/
+struct lguest_data {
+	/*
+	 * 512 == enabled (same as eflags in normal hardware).  The Guest
+	 * changes interrupts so often that a hypercall is too slow.
+	 */
+	unsigned int irq_enabled;
+	/* Fine-grained interrupt disabling by the Guest */
+	DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
+
+	/*
+	 * The Host writes the virtual address of the last page fault here,
+	 * which saves the Guest a hypercall.  CR2 is the native register where
+	 * this address would normally be found.
+	 */
+	unsigned long cr2;
+
+	/* Wallclock time set by the Host. */
+	struct timespec time;
+
+	/*
+	 * Interrupt pending set by the Host.  The Guest should do a hypercall
+	 * if it re-enables interrupts and sees this set (to X86_EFLAGS_IF).
+	 */
+	int irq_pending;
+
+	/*
+	 * Async hypercall ring.  Instead of directly making hypercalls, we can
+	 * place them in here for processing the next time the Host wants.
+	 * This batching can be quite efficient.
+	 */
+
+	/* 0xFF == done (set by Host), 0 == pending (set by Guest). */
+	u8 hcall_status[LHCALL_RING_SIZE];
+	/* The actual registers for the hypercalls. */
+	struct hcall_args hcalls[LHCALL_RING_SIZE];
+
+/* Fields initialized by the Host at boot: */
+	/* Memory not to try to access */
+	unsigned long reserve_mem;
+	/* KHz for the TSC clock. */
+	u32 tsc_khz;
+
+/* Fields initialized by the Guest at boot: */
+	/* Instruction to suppress interrupts even if enabled */
+	unsigned long noirq_iret;
+	/* Address above which page tables are all identical. */
+	unsigned long kernel_address;
+	/* The vector to try to use for system calls (0x40 or 0x80). */
+	unsigned int syscall_vec;
+};
+extern struct lguest_data lguest_data;
+#endif /* __ASSEMBLY__ */
+#endif	/* _LINUX_LGUEST_H */