1 #ifndef __ASM_POWERPC_FEATURE_FIXUPS_H
2 #define __ASM_POWERPC_FEATURE_FIXUPS_H
3 
4 /*
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version
8  * 2 of the License, or (at your option) any later version.
9  */
10 
11 /*
12  * Feature section common macros
13  *
14  * Note that the entries now contain offsets between the table entry
15  * and the code rather than absolute code pointers in order to be
16  * useable with the vdso shared library. There is also an assumption
17  * that values will be negative, that is, the fixup table has to be
18  * located after the code it fixes up.
19  */
20 #if defined(CONFIG_PPC64) && !defined(__powerpc64__)
21 /* 64 bits kernel, 32 bits code (ie. vdso32) */
22 #define FTR_ENTRY_LONG		.llong
23 #define FTR_ENTRY_OFFSET	.long 0xffffffff; .long
24 #elif defined(CONFIG_PPC64)
25 #define FTR_ENTRY_LONG		.llong
26 #define FTR_ENTRY_OFFSET	.llong
27 #else
28 #define FTR_ENTRY_LONG		.long
29 #define FTR_ENTRY_OFFSET	.long
30 #endif
31 
32 #define START_FTR_SECTION(label)	label##1:
33 
34 #define FTR_SECTION_ELSE_NESTED(label)			\
35 label##2:						\
36 	.pushsection __ftr_alt_##label,"a";		\
37 	.align 2;					\
38 label##3:
39 
40 #define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect)	\
41 label##4:						\
42 	.popsection;					\
43 	.pushsection sect,"a";				\
44 	.align 3;					\
45 label##5:					       	\
46 	FTR_ENTRY_LONG msk;				\
47 	FTR_ENTRY_LONG val;				\
48 	FTR_ENTRY_OFFSET label##1b-label##5b;		\
49 	FTR_ENTRY_OFFSET label##2b-label##5b;	 	\
50 	FTR_ENTRY_OFFSET label##3b-label##5b;		\
51 	FTR_ENTRY_OFFSET label##4b-label##5b;	 	\
52 	.popsection;
53 
54 
55 /* CPU feature dependent sections */
56 #define BEGIN_FTR_SECTION_NESTED(label)	START_FTR_SECTION(label)
57 #define BEGIN_FTR_SECTION		START_FTR_SECTION(97)
58 
59 #define END_FTR_SECTION_NESTED(msk, val, label) 		\
60 	FTR_SECTION_ELSE_NESTED(label)				\
61 	MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
62 
63 #define END_FTR_SECTION(msk, val)		\
64 	END_FTR_SECTION_NESTED(msk, val, 97)
65 
66 #define END_FTR_SECTION_IFSET(msk)	END_FTR_SECTION((msk), (msk))
67 #define END_FTR_SECTION_IFCLR(msk)	END_FTR_SECTION((msk), 0)
68 
69 /* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
70 #define FTR_SECTION_ELSE	FTR_SECTION_ELSE_NESTED(97)
71 #define ALT_FTR_SECTION_END_NESTED(msk, val, label)	\
72 	MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup)
73 #define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label)	\
74 	ALT_FTR_SECTION_END_NESTED(msk, msk, label)
75 #define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label)	\
76 	ALT_FTR_SECTION_END_NESTED(msk, 0, label)
77 #define ALT_FTR_SECTION_END(msk, val)	\
78 	ALT_FTR_SECTION_END_NESTED(msk, val, 97)
79 #define ALT_FTR_SECTION_END_IFSET(msk)	\
80 	ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97)
81 #define ALT_FTR_SECTION_END_IFCLR(msk)	\
82 	ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
83 
84 /* MMU feature dependent sections */
85 #define BEGIN_MMU_FTR_SECTION_NESTED(label)	START_FTR_SECTION(label)
86 #define BEGIN_MMU_FTR_SECTION			START_FTR_SECTION(97)
87 
88 #define END_MMU_FTR_SECTION_NESTED(msk, val, label) 		\
89 	FTR_SECTION_ELSE_NESTED(label)				\
90 	MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
91 
92 #define END_MMU_FTR_SECTION(msk, val)		\
93 	END_MMU_FTR_SECTION_NESTED(msk, val, 97)
94 
95 #define END_MMU_FTR_SECTION_IFSET(msk)	END_MMU_FTR_SECTION((msk), (msk))
96 #define END_MMU_FTR_SECTION_IFCLR(msk)	END_MMU_FTR_SECTION((msk), 0)
97 
98 /* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */
99 #define MMU_FTR_SECTION_ELSE_NESTED(label)	FTR_SECTION_ELSE_NESTED(label)
100 #define MMU_FTR_SECTION_ELSE	MMU_FTR_SECTION_ELSE_NESTED(97)
101 #define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label)	\
102 	MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup)
103 #define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label)	\
104 	ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label)
105 #define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label)	\
106 	ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label)
107 #define ALT_MMU_FTR_SECTION_END(msk, val)	\
108 	ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97)
109 #define ALT_MMU_FTR_SECTION_END_IFSET(msk)	\
110 	ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97)
111 #define ALT_MMU_FTR_SECTION_END_IFCLR(msk)	\
112 	ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
113 
114 /* Firmware feature dependent sections */
115 #define BEGIN_FW_FTR_SECTION_NESTED(label)	START_FTR_SECTION(label)
116 #define BEGIN_FW_FTR_SECTION			START_FTR_SECTION(97)
117 
118 #define END_FW_FTR_SECTION_NESTED(msk, val, label) 		\
119 	FTR_SECTION_ELSE_NESTED(label)				\
120 	MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
121 
122 #define END_FW_FTR_SECTION(msk, val)		\
123 	END_FW_FTR_SECTION_NESTED(msk, val, 97)
124 
125 #define END_FW_FTR_SECTION_IFSET(msk)	END_FW_FTR_SECTION((msk), (msk))
126 #define END_FW_FTR_SECTION_IFCLR(msk)	END_FW_FTR_SECTION((msk), 0)
127 
128 /* Firmware feature sections with alternatives */
129 #define FW_FTR_SECTION_ELSE_NESTED(label)	FTR_SECTION_ELSE_NESTED(label)
130 #define FW_FTR_SECTION_ELSE	FTR_SECTION_ELSE_NESTED(97)
131 #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label)	\
132 	MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup)
133 #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label)	\
134 	ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label)
135 #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label)	\
136 	ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label)
137 #define ALT_FW_FTR_SECTION_END(msk, val)	\
138 	ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97)
139 #define ALT_FW_FTR_SECTION_END_IFSET(msk)	\
140 	ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97)
141 #define ALT_FW_FTR_SECTION_END_IFCLR(msk)	\
142 	ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97)
143 
144 #ifndef __ASSEMBLY__
145 
146 #define ASM_MMU_FTR_IF(section_if, section_else, msk, val)	\
147 	stringify_in_c(BEGIN_MMU_FTR_SECTION)			\
148 	section_if "; "						\
149 	stringify_in_c(MMU_FTR_SECTION_ELSE)			\
150 	section_else "; "					\
151 	stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val)))
152 
153 #define ASM_MMU_FTR_IFSET(section_if, section_else, msk)	\
154 	ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk))
155 
156 #define ASM_MMU_FTR_IFCLR(section_if, section_else, msk)	\
157 	ASM_MMU_FTR_IF(section_if, section_else, (msk), 0)
158 
159 #endif /* __ASSEMBLY__ */
160 
161 /* LWSYNC feature sections */
162 #define START_LWSYNC_SECTION(label)	label##1:
163 #define MAKE_LWSYNC_SECTION_ENTRY(label, sect)		\
164 label##2:						\
165 	.pushsection sect,"a";				\
166 	.align 2;					\
167 label##3:					       	\
168 	.long label##1b-label##3b;			\
169 	.popsection;
170 
171 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */
172