[PATCH v2 02/13] libx86: Introduce libx86/cpuid.h

[Andrew Cooper <andrew.cooper3@citrix.com>]

Begin to untangle the header dependency tangle by moving definition of
struct cpuid_leaf out of x86_emulate.h into the new cpuid.h.

Additionally, plumb the header through to libxc.  This is technically a
redundant include at this point, but it helps build-test the later changes,
and will be used eventually.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Sergey Dyasli <sergey.dyasli@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>

Note concerning the positioning of libx86.  It turns out after trying to move
it elsewhere that the movement is prohibitive because of the way Xen headers
are included by the tools.

For now, this is consistent with the other libs, and we can move it in the
future after some hygene has been applied to the build system.
---
 tools/include/Makefile                 |  1 +
 tools/libxc/xc_cpuid_x86.c             |  2 ++
 xen/arch/x86/x86_emulate/x86_emulate.h |  7 ++-----
 xen/include/asm-x86/cpuid.h            |  4 +++-
 xen/include/xen/libx86/cpuid.h         | 20 ++++++++++++++++++++
 5 files changed, 28 insertions(+), 6 deletions(-)
 create mode 100644 xen/include/xen/libx86/cpuid.h

diff --git a/tools/include/Makefile b/tools/include/Makefile
index 270a34f..a2403fc 100644
--- a/tools/include/Makefile
+++ b/tools/include/Makefile
@@ -23,6 +23,7 @@ xen/.dir:
 	ln -sf $(XEN_ROOT)/xen/include/acpi acpi
 ifeq ($(CONFIG_X86),y)
 	ln -sf $(XEN_ROOT)/xen/include/asm-x86 xen/asm
+	ln -sf $(XEN_ROOT)/xen/include/xen/libx86 xen/libx86
 endif
 	touch $@
 
diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index c5c3cdc..090e199 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -33,6 +33,8 @@ enum {
 };
 #include "_xc_cpuid_autogen.h"
 
+#include <xen/libx86/cpuid.h>
+
 #define bitmaskof(idx)      (1u << ((idx) & 31))
 #define featureword_of(idx) ((idx) >> 5)
 #define clear_feature(idx, dst) ((dst) &= ~bitmaskof(idx))
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.h b/xen/arch/x86/x86_emulate/x86_emulate.h
index c22e774..abd9796 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.h
+++ b/xen/arch/x86/x86_emulate/x86_emulate.h
@@ -23,6 +23,8 @@
 #ifndef __X86_EMULATE_H__
 #define __X86_EMULATE_H__
 
+#include <xen/libx86/cpuid.h>
+
 #define MAX_INST_LEN 15
 
 #if defined(__i386__)
@@ -172,11 +174,6 @@ enum x86_emulate_fpu_type {
     X86EMUL_FPU_none
 };
 
-struct cpuid_leaf
-{
-    uint32_t a, b, c, d;
-};
-
 struct x86_emulate_state;
 
 /*
diff --git a/xen/include/asm-x86/cpuid.h b/xen/include/asm-x86/cpuid.h
index 4113a5e..9637303 100644
--- a/xen/include/asm-x86/cpuid.h
+++ b/xen/include/asm-x86/cpuid.h
@@ -18,7 +18,9 @@
 #ifndef __ASSEMBLY__
 #include <xen/types.h>
 #include <xen/kernel.h>
-#include <asm/x86_emulate.h>
+
+#include <xen/libx86/cpuid.h>
+
 #include <public/sysctl.h>
 
 extern const uint32_t known_features[FSCAPINTS];
diff --git a/xen/include/xen/libx86/cpuid.h b/xen/include/xen/libx86/cpuid.h
new file mode 100644
index 0000000..3ccc68e
--- /dev/null
+++ b/xen/include/xen/libx86/cpuid.h
@@ -0,0 +1,20 @@
+/* Common data structures and functions consumed by hypervisor and toolstack */
+#ifndef XEN_LIBX86_CPUID_H
+#define XEN_LIBX86_CPUID_H
+
+struct cpuid_leaf
+{
+    uint32_t a, b, c, d;
+};
+
+#endif /* !XEN_LIBX86_CPUID_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.1.4


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