1 files changed, 126 insertions, 0 deletions

diff --git a/include/asm-powerpc/feature-fixups.h b/include/asm-powerpc/feature-fixups.h
new file mode 100644
index 000000000000..a1029967620b
--- /dev/null
+++ b/include/asm-powerpc/feature-fixups.h
@@ -0,0 +1,126 @@
+#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.
+ */
+
+#ifdef __ASSEMBLY__
+
+/*
+ * 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
+#else
+/* 64 bit kernel 64 bit code, or 32 bit kernel 32 bit code */
+#define FTR_ENTRY_LONG          PPC_LONG
+#define FTR_ENTRY_OFFSET        PPC_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;           \
+        .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)
+
+/* 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)
+
+#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:                                               \
+        .long label##1b-label##3b;                      \
+        .popsection;
+
+#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */