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1da177e4 LT |
1 | /* |
2 | * Instruction-patching support. | |
3 | * | |
4 | * Copyright (C) 2003 Hewlett-Packard Co | |
5 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | */ | |
7 | #include <linux/init.h> | |
8 | #include <linux/string.h> | |
9 | ||
10 | #include <asm/patch.h> | |
11 | #include <asm/processor.h> | |
12 | #include <asm/sections.h> | |
13 | #include <asm/system.h> | |
14 | #include <asm/unistd.h> | |
15 | ||
16 | /* | |
17 | * This was adapted from code written by Tony Luck: | |
18 | * | |
19 | * The 64-bit value in a "movl reg=value" is scattered between the two words of the bundle | |
20 | * like this: | |
21 | * | |
22 | * 6 6 5 4 3 2 1 | |
23 | * 3210987654321098765432109876543210987654321098765432109876543210 | |
24 | * ABBBBBBBBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCDEEEEEFFFFFFFFFGGGGGGG | |
25 | * | |
26 | * CCCCCCCCCCCCCCCCCCxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx | |
27 | * xxxxAFFFFFFFFFEEEEEDxGGGGGGGxxxxxxxxxxxxxBBBBBBBBBBBBBBBBBBBBBBB | |
28 | */ | |
29 | static u64 | |
30 | get_imm64 (u64 insn_addr) | |
31 | { | |
32 | u64 *p = (u64 *) (insn_addr & -16); /* mask out slot number */ | |
33 | ||
34 | return ( (p[1] & 0x0800000000000000UL) << 4) | /*A*/ | |
35 | ((p[1] & 0x00000000007fffffUL) << 40) | /*B*/ | |
36 | ((p[0] & 0xffffc00000000000UL) >> 24) | /*C*/ | |
37 | ((p[1] & 0x0000100000000000UL) >> 23) | /*D*/ | |
38 | ((p[1] & 0x0003e00000000000UL) >> 29) | /*E*/ | |
39 | ((p[1] & 0x07fc000000000000UL) >> 43) | /*F*/ | |
40 | ((p[1] & 0x000007f000000000UL) >> 36); /*G*/ | |
41 | } | |
42 | ||
43 | /* Patch instruction with "val" where "mask" has 1 bits. */ | |
44 | void | |
45 | ia64_patch (u64 insn_addr, u64 mask, u64 val) | |
46 | { | |
47 | u64 m0, m1, v0, v1, b0, b1, *b = (u64 *) (insn_addr & -16); | |
48 | # define insn_mask ((1UL << 41) - 1) | |
49 | unsigned long shift; | |
50 | ||
51 | b0 = b[0]; b1 = b[1]; | |
52 | shift = 5 + 41 * (insn_addr % 16); /* 5 bits of template, then 3 x 41-bit instructions */ | |
53 | if (shift >= 64) { | |
54 | m1 = mask << (shift - 64); | |
55 | v1 = val << (shift - 64); | |
56 | } else { | |
57 | m0 = mask << shift; m1 = mask >> (64 - shift); | |
58 | v0 = val << shift; v1 = val >> (64 - shift); | |
59 | b[0] = (b0 & ~m0) | (v0 & m0); | |
60 | } | |
61 | b[1] = (b1 & ~m1) | (v1 & m1); | |
62 | } | |
63 | ||
64 | void | |
65 | ia64_patch_imm64 (u64 insn_addr, u64 val) | |
66 | { | |
9c184a07 L |
67 | /* The assembler may generate offset pointing to either slot 1 |
68 | or slot 2 for a long (2-slot) instruction, occupying slots 1 | |
69 | and 2. */ | |
70 | insn_addr &= -16UL; | |
71 | ia64_patch(insn_addr + 2, | |
1da177e4 LT |
72 | 0x01fffefe000UL, ( ((val & 0x8000000000000000UL) >> 27) /* bit 63 -> 36 */ |
73 | | ((val & 0x0000000000200000UL) << 0) /* bit 21 -> 21 */ | |
74 | | ((val & 0x00000000001f0000UL) << 6) /* bit 16 -> 22 */ | |
75 | | ((val & 0x000000000000ff80UL) << 20) /* bit 7 -> 27 */ | |
76 | | ((val & 0x000000000000007fUL) << 13) /* bit 0 -> 13 */)); | |
9c184a07 | 77 | ia64_patch(insn_addr + 1, 0x1ffffffffffUL, val >> 22); |
1da177e4 LT |
78 | } |
79 | ||
80 | void | |
81 | ia64_patch_imm60 (u64 insn_addr, u64 val) | |
82 | { | |
9c184a07 L |
83 | /* The assembler may generate offset pointing to either slot 1 |
84 | or slot 2 for a long (2-slot) instruction, occupying slots 1 | |
85 | and 2. */ | |
86 | insn_addr &= -16UL; | |
87 | ia64_patch(insn_addr + 2, | |
1da177e4 LT |
88 | 0x011ffffe000UL, ( ((val & 0x0800000000000000UL) >> 23) /* bit 59 -> 36 */ |
89 | | ((val & 0x00000000000fffffUL) << 13) /* bit 0 -> 13 */)); | |
9c184a07 | 90 | ia64_patch(insn_addr + 1, 0x1fffffffffcUL, val >> 18); |
1da177e4 LT |
91 | } |
92 | ||
93 | /* | |
94 | * We need sometimes to load the physical address of a kernel | |
95 | * object. Often we can convert the virtual address to physical | |
96 | * at execution time, but sometimes (either for performance reasons | |
97 | * or during error recovery) we cannot to this. Patch the marked | |
98 | * bundles to load the physical address. | |
99 | */ | |
100 | void __init | |
101 | ia64_patch_vtop (unsigned long start, unsigned long end) | |
102 | { | |
103 | s32 *offp = (s32 *) start; | |
104 | u64 ip; | |
105 | ||
106 | while (offp < (s32 *) end) { | |
107 | ip = (u64) offp + *offp; | |
108 | ||
109 | /* replace virtual address with corresponding physical address: */ | |
110 | ia64_patch_imm64(ip, ia64_tpa(get_imm64(ip))); | |
111 | ia64_fc((void *) ip); | |
112 | ++offp; | |
113 | } | |
114 | ia64_sync_i(); | |
115 | ia64_srlz_i(); | |
116 | } | |
117 | ||
914a4ea4 | 118 | void __init |
1da177e4 LT |
119 | ia64_patch_mckinley_e9 (unsigned long start, unsigned long end) |
120 | { | |
121 | static int first_time = 1; | |
122 | int need_workaround; | |
123 | s32 *offp = (s32 *) start; | |
124 | u64 *wp; | |
125 | ||
126 | need_workaround = (local_cpu_data->family == 0x1f && local_cpu_data->model == 0); | |
127 | ||
128 | if (first_time) { | |
129 | first_time = 0; | |
130 | if (need_workaround) | |
131 | printk(KERN_INFO "Leaving McKinley Errata 9 workaround enabled\n"); | |
132 | else | |
133 | printk(KERN_INFO "McKinley Errata 9 workaround not needed; " | |
134 | "disabling it\n"); | |
135 | } | |
136 | if (need_workaround) | |
137 | return; | |
138 | ||
139 | while (offp < (s32 *) end) { | |
140 | wp = (u64 *) ia64_imva((char *) offp + *offp); | |
141 | wp[0] = 0x0000000100000000UL; /* nop.m 0; nop.i 0; nop.i 0 */ | |
142 | wp[1] = 0x0004000000000200UL; | |
143 | wp[2] = 0x0000000100000011UL; /* nop.m 0; nop.i 0; br.ret.sptk.many b6 */ | |
144 | wp[3] = 0x0084006880000200UL; | |
145 | ia64_fc(wp); ia64_fc(wp + 2); | |
146 | ++offp; | |
147 | } | |
148 | ia64_sync_i(); | |
149 | ia64_srlz_i(); | |
150 | } | |
151 | ||
914a4ea4 | 152 | static void __init |
1da177e4 LT |
153 | patch_fsyscall_table (unsigned long start, unsigned long end) |
154 | { | |
155 | extern unsigned long fsyscall_table[NR_syscalls]; | |
156 | s32 *offp = (s32 *) start; | |
157 | u64 ip; | |
158 | ||
159 | while (offp < (s32 *) end) { | |
160 | ip = (u64) ia64_imva((char *) offp + *offp); | |
161 | ia64_patch_imm64(ip, (u64) fsyscall_table); | |
162 | ia64_fc((void *) ip); | |
163 | ++offp; | |
164 | } | |
165 | ia64_sync_i(); | |
166 | ia64_srlz_i(); | |
167 | } | |
168 | ||
914a4ea4 | 169 | static void __init |
1da177e4 LT |
170 | patch_brl_fsys_bubble_down (unsigned long start, unsigned long end) |
171 | { | |
172 | extern char fsys_bubble_down[]; | |
173 | s32 *offp = (s32 *) start; | |
174 | u64 ip; | |
175 | ||
176 | while (offp < (s32 *) end) { | |
177 | ip = (u64) offp + *offp; | |
178 | ia64_patch_imm60((u64) ia64_imva((void *) ip), | |
179 | (u64) (fsys_bubble_down - (ip & -16)) / 16); | |
180 | ia64_fc((void *) ip); | |
181 | ++offp; | |
182 | } | |
183 | ia64_sync_i(); | |
184 | ia64_srlz_i(); | |
185 | } | |
186 | ||
914a4ea4 | 187 | void __init |
1da177e4 LT |
188 | ia64_patch_gate (void) |
189 | { | |
190 | # define START(name) ((unsigned long) __start_gate_##name##_patchlist) | |
191 | # define END(name) ((unsigned long)__end_gate_##name##_patchlist) | |
192 | ||
193 | patch_fsyscall_table(START(fsyscall), END(fsyscall)); | |
194 | patch_brl_fsys_bubble_down(START(brl_fsys_bubble_down), END(brl_fsys_bubble_down)); | |
195 | ia64_patch_vtop(START(vtop), END(vtop)); | |
196 | ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9)); | |
197 | } |