diff options
author | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-05-02 13:27:12 -0400 |
---|---|---|
committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 13:27:12 -0400 |
commit | 1353ebb4b48151e3810d9a60449edd43a90ea3c3 (patch) | |
tree | eb21d594e0aa029e38a3a79d47ed17c3d2d67f7d /include/asm-i386/bugs.h | |
parent | 0d08e0d3a97cce22ebf80b54785e00d9b94e1add (diff) |
[PATCH] i386: Clean up asm-i386/bugs.h
Most of asm-i386/bugs.h is code which should be in a C file, so put it there.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386/bugs.h')
-rw-r--r-- | include/asm-i386/bugs.h | 194 |
1 files changed, 4 insertions, 190 deletions
diff --git a/include/asm-i386/bugs.h b/include/asm-i386/bugs.h index c90c7c499302..df539b390448 100644 --- a/include/asm-i386/bugs.h +++ b/include/asm-i386/bugs.h | |||
@@ -1,198 +1,12 @@ | |||
1 | /* | 1 | /* |
2 | * include/asm-i386/bugs.h | ||
3 | * | ||
4 | * Copyright (C) 1994 Linus Torvalds | ||
5 | * | ||
6 | * Cyrix stuff, June 1998 by: | ||
7 | * - Rafael R. Reilova (moved everything from head.S), | ||
8 | * <rreilova@ececs.uc.edu> | ||
9 | * - Channing Corn (tests & fixes), | ||
10 | * - Andrew D. Balsa (code cleanup). | ||
11 | */ | ||
12 | |||
13 | /* | ||
14 | * This is included by init/main.c to check for architecture-dependent bugs. | 2 | * This is included by init/main.c to check for architecture-dependent bugs. |
15 | * | 3 | * |
16 | * Needs: | 4 | * Needs: |
17 | * void check_bugs(void); | 5 | * void check_bugs(void); |
18 | */ | 6 | */ |
7 | #ifndef _ASM_I386_BUG_H | ||
8 | #define _ASM_I386_BUG_H | ||
19 | 9 | ||
20 | #include <linux/init.h> | 10 | extern void __init check_bugs(void); |
21 | #include <asm/processor.h> | ||
22 | #include <asm/i387.h> | ||
23 | #include <asm/msr.h> | ||
24 | #include <asm/paravirt.h> | ||
25 | |||
26 | static int __init no_halt(char *s) | ||
27 | { | ||
28 | boot_cpu_data.hlt_works_ok = 0; | ||
29 | return 1; | ||
30 | } | ||
31 | |||
32 | __setup("no-hlt", no_halt); | ||
33 | |||
34 | static int __init mca_pentium(char *s) | ||
35 | { | ||
36 | mca_pentium_flag = 1; | ||
37 | return 1; | ||
38 | } | ||
39 | |||
40 | __setup("mca-pentium", mca_pentium); | ||
41 | |||
42 | static int __init no_387(char *s) | ||
43 | { | ||
44 | boot_cpu_data.hard_math = 0; | ||
45 | write_cr0(0xE | read_cr0()); | ||
46 | return 1; | ||
47 | } | ||
48 | |||
49 | __setup("no387", no_387); | ||
50 | |||
51 | static double __initdata x = 4195835.0; | ||
52 | static double __initdata y = 3145727.0; | ||
53 | |||
54 | /* | ||
55 | * This used to check for exceptions.. | ||
56 | * However, it turns out that to support that, | ||
57 | * the XMM trap handlers basically had to | ||
58 | * be buggy. So let's have a correct XMM trap | ||
59 | * handler, and forget about printing out | ||
60 | * some status at boot. | ||
61 | * | ||
62 | * We should really only care about bugs here | ||
63 | * anyway. Not features. | ||
64 | */ | ||
65 | static void __init check_fpu(void) | ||
66 | { | ||
67 | if (!boot_cpu_data.hard_math) { | ||
68 | #ifndef CONFIG_MATH_EMULATION | ||
69 | printk(KERN_EMERG "No coprocessor found and no math emulation present.\n"); | ||
70 | printk(KERN_EMERG "Giving up.\n"); | ||
71 | for (;;) ; | ||
72 | #endif | ||
73 | return; | ||
74 | } | ||
75 | |||
76 | /* trap_init() enabled FXSR and company _before_ testing for FP problems here. */ | ||
77 | /* Test for the divl bug.. */ | ||
78 | __asm__("fninit\n\t" | ||
79 | "fldl %1\n\t" | ||
80 | "fdivl %2\n\t" | ||
81 | "fmull %2\n\t" | ||
82 | "fldl %1\n\t" | ||
83 | "fsubp %%st,%%st(1)\n\t" | ||
84 | "fistpl %0\n\t" | ||
85 | "fwait\n\t" | ||
86 | "fninit" | ||
87 | : "=m" (*&boot_cpu_data.fdiv_bug) | ||
88 | : "m" (*&x), "m" (*&y)); | ||
89 | if (boot_cpu_data.fdiv_bug) | ||
90 | printk("Hmm, FPU with FDIV bug.\n"); | ||
91 | } | ||
92 | |||
93 | static void __init check_hlt(void) | ||
94 | { | ||
95 | if (paravirt_enabled()) | ||
96 | return; | ||
97 | |||
98 | printk(KERN_INFO "Checking 'hlt' instruction... "); | ||
99 | if (!boot_cpu_data.hlt_works_ok) { | ||
100 | printk("disabled\n"); | ||
101 | return; | ||
102 | } | ||
103 | halt(); | ||
104 | halt(); | ||
105 | halt(); | ||
106 | halt(); | ||
107 | printk("OK.\n"); | ||
108 | } | ||
109 | |||
110 | /* | ||
111 | * Most 386 processors have a bug where a POPAD can lock the | ||
112 | * machine even from user space. | ||
113 | */ | ||
114 | |||
115 | static void __init check_popad(void) | ||
116 | { | ||
117 | #ifndef CONFIG_X86_POPAD_OK | ||
118 | int res, inp = (int) &res; | ||
119 | |||
120 | printk(KERN_INFO "Checking for popad bug... "); | ||
121 | __asm__ __volatile__( | ||
122 | "movl $12345678,%%eax; movl $0,%%edi; pusha; popa; movl (%%edx,%%edi),%%ecx " | ||
123 | : "=&a" (res) | ||
124 | : "d" (inp) | ||
125 | : "ecx", "edi" ); | ||
126 | /* If this fails, it means that any user program may lock the CPU hard. Too bad. */ | ||
127 | if (res != 12345678) printk( "Buggy.\n" ); | ||
128 | else printk( "OK.\n" ); | ||
129 | #endif | ||
130 | } | ||
131 | |||
132 | /* | ||
133 | * Check whether we are able to run this kernel safely on SMP. | ||
134 | * | ||
135 | * - In order to run on a i386, we need to be compiled for i386 | ||
136 | * (for due to lack of "invlpg" and working WP on a i386) | ||
137 | * - In order to run on anything without a TSC, we need to be | ||
138 | * compiled for a i486. | ||
139 | * - In order to support the local APIC on a buggy Pentium machine, | ||
140 | * we need to be compiled with CONFIG_X86_GOOD_APIC disabled, | ||
141 | * which happens implicitly if compiled for a Pentium or lower | ||
142 | * (unless an advanced selection of CPU features is used) as an | ||
143 | * otherwise config implies a properly working local APIC without | ||
144 | * the need to do extra reads from the APIC. | ||
145 | */ | ||
146 | |||
147 | static void __init check_config(void) | ||
148 | { | ||
149 | /* | ||
150 | * We'd better not be a i386 if we're configured to use some | ||
151 | * i486+ only features! (WP works in supervisor mode and the | ||
152 | * new "invlpg" and "bswap" instructions) | ||
153 | */ | ||
154 | #if defined(CONFIG_X86_WP_WORKS_OK) || defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_BSWAP) | ||
155 | if (boot_cpu_data.x86 == 3) | ||
156 | panic("Kernel requires i486+ for 'invlpg' and other features"); | ||
157 | #endif | ||
158 | |||
159 | /* | ||
160 | * If we configured ourselves for a TSC, we'd better have one! | ||
161 | */ | ||
162 | #ifdef CONFIG_X86_TSC | ||
163 | if (!cpu_has_tsc && !tsc_disable) | ||
164 | panic("Kernel compiled for Pentium+, requires TSC feature!"); | ||
165 | #endif | ||
166 | |||
167 | /* | ||
168 | * If we were told we had a good local APIC, check for buggy Pentia, | ||
169 | * i.e. all B steppings and the C2 stepping of P54C when using their | ||
170 | * integrated APIC (see 11AP erratum in "Pentium Processor | ||
171 | * Specification Update"). | ||
172 | */ | ||
173 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_GOOD_APIC) | ||
174 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL | ||
175 | && cpu_has_apic | ||
176 | && boot_cpu_data.x86 == 5 | ||
177 | && boot_cpu_data.x86_model == 2 | ||
178 | && (boot_cpu_data.x86_mask < 6 || boot_cpu_data.x86_mask == 11)) | ||
179 | panic("Kernel compiled for PMMX+, assumes a local APIC without the read-before-write bug!"); | ||
180 | #endif | ||
181 | } | ||
182 | |||
183 | extern void alternative_instructions(void); | ||
184 | 11 | ||
185 | static void __init check_bugs(void) | 12 | #endif /* _ASM_I386_BUG_H */ |
186 | { | ||
187 | identify_cpu(&boot_cpu_data); | ||
188 | #ifndef CONFIG_SMP | ||
189 | printk("CPU: "); | ||
190 | print_cpu_info(&boot_cpu_data); | ||
191 | #endif | ||
192 | check_config(); | ||
193 | check_fpu(); | ||
194 | check_hlt(); | ||
195 | check_popad(); | ||
196 | init_utsname()->machine[1] = '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86); | ||
197 | alternative_instructions(); | ||
198 | } | ||