x86 hvm: Replace old MMIO emulator with x86_emulate()-based harness.

Re-factor VMX real-mode emulation to use the same harness.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/xen/include/asm-x86/hvm/emulate.h b/xen/include/asm-x86/hvm/emulate.h
new file mode 100644
index 0000000000..f059bcdedf
--- /dev/null
+++ b/xen/include/asm-x86/hvm/emulate.h
@@ -0,0 +1,55 @@
+/******************************************************************************
+ * hvm/emulate.h
+ * 
+ * HVM instruction emulation. Used for MMIO and VMX real mode.
+ * 
+ * Copyright (c) 2008 Citrix Systems, Inc.
+ * 
+ * Authors:
+ *    Keir Fraser <keir.fraser@citrix.com>
+ */
+
+#ifndef __ASM_X86_HVM_EMULATE_H__
+#define __ASM_X86_HVM_EMULATE_H__
+
+#include <xen/config.h>
+#include <asm/x86_emulate.h>
+
+struct hvm_emulate_ctxt {
+    struct x86_emulate_ctxt ctxt;
+
+    /* Cache of 16 bytes of instruction. */
+    uint8_t insn_buf[16];
+    unsigned long insn_buf_eip;
+    unsigned int insn_buf_bytes;
+
+    struct segment_register seg_reg[10];
+    unsigned long seg_reg_accessed;
+    unsigned long seg_reg_dirty;
+
+    union {
+        struct {
+            unsigned int hlt:1;
+            unsigned int mov_ss:1;
+            unsigned int sti:1;
+            unsigned int exn_pending:1;
+        } flags;
+        unsigned int flag_word;
+    };
+
+    uint8_t exn_vector;
+    uint8_t exn_insn_len;
+};
+
+int hvm_emulate_one(
+    struct hvm_emulate_ctxt *hvmemul_ctxt);
+void hvm_emulate_prepare(
+    struct hvm_emulate_ctxt *hvmemul_ctxt,
+    struct cpu_user_regs *regs);
+void hvm_emulate_writeback(
+    struct hvm_emulate_ctxt *hvmemul_ctxt);
+struct segment_register *hvmemul_get_seg_reg(
+    enum x86_segment seg,
+    struct hvm_emulate_ctxt *hvmemul_ctxt);
+
+#endif /* __ASM_X86_HVM_EMULATE_H__ */