Initial import

1 files changed, 187 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/feature-fixups.h b/arch/powerpc/include/asm/feature-fixups.h
new file mode 100644
index 000000000..9a67a38bf
--- /dev/null
+++ b/arch/powerpc/include/asm/feature-fixups.h
@@ -0,0 +1,187 @@
+#ifndef __ASM_POWERPC_FEATURE_FIXUPS_H
+#define __ASM_POWERPC_FEATURE_FIXUPS_H
+
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Feature section common macros
+ *
+ * Note that the entries now contain offsets between the table entry
+ * and the code rather than absolute code pointers in order to be
+ * useable with the vdso shared library. There is also an assumption
+ * that values will be negative, that is, the fixup table has to be
+ * located after the code it fixes up.
+ */
+#if defined(CONFIG_PPC64) && !defined(__powerpc64__)
+/* 64 bits kernel, 32 bits code (ie. vdso32) */
+#define FTR_ENTRY_LONG		.llong
+#define FTR_ENTRY_OFFSET	.long 0xffffffff; .long
+#elif defined(CONFIG_PPC64)
+#define FTR_ENTRY_LONG		.llong
+#define FTR_ENTRY_OFFSET	.llong
+#else
+#define FTR_ENTRY_LONG		.long
+#define FTR_ENTRY_OFFSET	.long
+#endif
+
+#define START_FTR_SECTION(label)	label##1:
+
+#define FTR_SECTION_ELSE_NESTED(label)			\
+label##2:						\
+	.pushsection __ftr_alt_##label,"a";		\
+	.align 2;					\
+label##3:
+
+#define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect)		\
+label##4:							\
+	.popsection;						\
+	.pushsection sect,"a";					\
+	.align 3;						\
+label##5:							\
+	FTR_ENTRY_LONG msk;					\
+	FTR_ENTRY_LONG val;					\
+	FTR_ENTRY_OFFSET label##1b-label##5b;			\
+	FTR_ENTRY_OFFSET label##2b-label##5b;			\
+	FTR_ENTRY_OFFSET label##3b-label##5b;			\
+	FTR_ENTRY_OFFSET label##4b-label##5b;			\
+	.ifgt (label##4b- label##3b)-(label##2b- label##1b);	\
+	.error "Feature section else case larger than body";	\
+	.endif;							\
+	.popsection;
+
+
+/* CPU feature dependent sections */
+#define BEGIN_FTR_SECTION_NESTED(label)	START_FTR_SECTION(label)
+#define BEGIN_FTR_SECTION		START_FTR_SECTION(97)
+
+#define END_FTR_SECTION_NESTED(msk, val, label) 		\
+	FTR_SECTION_ELSE_NESTED(label)				\
+	MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
+
+#define END_FTR_SECTION(msk, val)		\
+	END_FTR_SECTION_NESTED(msk, val, 97)
+
+#define END_FTR_SECTION_IFSET(msk)	END_FTR_SECTION((msk), (msk))
+#define END_FTR_SECTION_IFCLR(msk)	END_FTR_SECTION((msk), 0)
+
+/* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
+#define FTR_SECTION_ELSE	FTR_SECTION_ELSE_NESTED(97)
+#define ALT_FTR_SECTION_END_NESTED(msk, val, label)	\
+	MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
+#define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label)	\
+	ALT_FTR_SECTION_END_NESTED(msk, msk, label)
+#define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label)	\
+	ALT_FTR_SECTION_END_NESTED(msk, 0, label)
+#define ALT_FTR_SECTION_END(msk, val)	\
+	ALT_FTR_SECTION_END_NESTED(msk, val, 97)
+#define ALT_FTR_SECTION_END_IFSET(msk)	\
+	ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97)
+#define ALT_FTR_SECTION_END_IFCLR(msk)	\
+	ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
+
+/* MMU feature dependent sections */
+#define BEGIN_MMU_FTR_SECTION_NESTED(label)	START_FTR_SECTION(label)
+#define BEGIN_MMU_FTR_SECTION			START_FTR_SECTION(97)
+
+#define END_MMU_FTR_SECTION_NESTED(msk, val, label) 		\
+	FTR_SECTION_ELSE_NESTED(label)				\
+	MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
+
+#define END_MMU_FTR_SECTION(msk, val)		\
+	END_MMU_FTR_SECTION_NESTED(msk, val, 97)
+
+#define END_MMU_FTR_SECTION_IFSET(msk)	END_MMU_FTR_SECTION((msk), (msk))
+#define END_MMU_FTR_SECTION_IFCLR(msk)	END_MMU_FTR_SECTION((msk), 0)
+
+/* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
+#define MMU_FTR_SECTION_ELSE_NESTED(label)	FTR_SECTION_ELSE_NESTED(label)
+#define MMU_FTR_SECTION_ELSE	MMU_FTR_SECTION_ELSE_NESTED(97)
+#define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label)	\
+	MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
+#define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label)	\
+	ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label)
+#define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label)	\
+	ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label)
+#define ALT_MMU_FTR_SECTION_END(msk, val)	\
+	ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97)
+#define ALT_MMU_FTR_SECTION_END_IFSET(msk)	\
+	ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97)
+#define ALT_MMU_FTR_SECTION_END_IFCLR(msk)	\
+	ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
+
+/* Firmware feature dependent sections */
+#define BEGIN_FW_FTR_SECTION_NESTED(label)	START_FTR_SECTION(label)
+#define BEGIN_FW_FTR_SECTION			START_FTR_SECTION(97)
+
+#define END_FW_FTR_SECTION_NESTED(msk, val, label) 		\
+	FTR_SECTION_ELSE_NESTED(label)				\
+	MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
+
+#define END_FW_FTR_SECTION(msk, val)		\
+	END_FW_FTR_SECTION_NESTED(msk, val, 97)
+
+#define END_FW_FTR_SECTION_IFSET(msk)	END_FW_FTR_SECTION((msk), (msk))
+#define END_FW_FTR_SECTION_IFCLR(msk)	END_FW_FTR_SECTION((msk), 0)
+
+/* Firmware feature sections with alternatives */
+#define FW_FTR_SECTION_ELSE_NESTED(label)	FTR_SECTION_ELSE_NESTED(label)
+#define FW_FTR_SECTION_ELSE	FTR_SECTION_ELSE_NESTED(97)
+#define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label)	\
+	MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
+#define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label)	\
+	ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
+#define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label)	\
+	ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
+#define ALT_FW_FTR_SECTION_END(msk, val)	\
+	ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
+#define ALT_FW_FTR_SECTION_END_IFSET(msk)	\
+	ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
+#define ALT_FW_FTR_SECTION_END_IFCLR(msk)	\
+	ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
+
+#ifndef __ASSEMBLY__
+
+#define ASM_FTR_IF(section_if, section_else, msk, val)	\
+	stringify_in_c(BEGIN_FTR_SECTION)			\
+	section_if "; "						\
+	stringify_in_c(FTR_SECTION_ELSE)			\
+	section_else "; "					\
+	stringify_in_c(ALT_FTR_SECTION_END((msk), (val)))
+
+#define ASM_FTR_IFSET(section_if, section_else, msk)	\
+	ASM_FTR_IF(section_if, section_else, (msk), (msk))
+
+#define ASM_FTR_IFCLR(section_if, section_else, msk)	\
+	ASM_FTR_IF(section_if, section_else, (msk), 0)
+
+#define ASM_MMU_FTR_IF(section_if, section_else, msk, val)	\
+	stringify_in_c(BEGIN_MMU_FTR_SECTION)			\
+	section_if "; "						\
+	stringify_in_c(MMU_FTR_SECTION_ELSE)			\
+	section_else "; "					\
+	stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val)))
+
+#define ASM_MMU_FTR_IFSET(section_if, section_else, msk)	\
+	ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk))
+
+#define ASM_MMU_FTR_IFCLR(section_if, section_else, msk)	\
+	ASM_MMU_FTR_IF(section_if, section_else, (msk), 0)
+
+#endif /* __ASSEMBLY__ */
+
+/* LWSYNC feature sections */
+#define START_LWSYNC_SECTION(label)	label##1:
+#define MAKE_LWSYNC_SECTION_ENTRY(label, sect)		\
+label##2:						\
+	.pushsection sect,"a";				\
+	.align 2;					\
+label##3:					       	\
+	FTR_ENTRY_OFFSET label##1b-label##3b;		\
+	.popsection;
+
+#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */