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[linux-2.6] / arch / um / sys-x86_64 / bugs.c
1 /*
2  * Copyright 2003 PathScale, Inc.
3  *
4  * Licensed under the GPL
5  */
6
7 #include "linux/sched.h"
8 #include "linux/errno.h"
9 #include "asm/system.h"
10 #include "asm/pda.h"
11 #include "sysdep/ptrace.h"
12 #include "os.h"
13
14 void arch_init_thread(void)
15 {
16 }
17
18 void arch_check_bugs(void)
19 {
20 }
21
22 int arch_handle_signal(int sig, union uml_pt_regs *regs)
23 {
24         return(0);
25 }
26
27 #define MAXTOKEN 64
28
29 /* Set during early boot */
30 int host_has_cmov = 1;
31 int host_has_xmm = 0;
32
33 static char token(int fd, char *buf, int len, char stop)
34 {
35         int n;
36         char *ptr, *end, c;
37
38         ptr = buf;
39         end = &buf[len];
40         do {
41                 n = os_read_file(fd, ptr, sizeof(*ptr));
42                 c = *ptr++;
43                 if(n != sizeof(*ptr)){
44                         if(n == 0) return(0);
45                         printk("Reading /proc/cpuinfo failed, err = %d\n", -n);
46                         if(n < 0)
47                                 return(n);
48                         else
49                                 return(-EIO);
50                 }
51         } while((c != '\n') && (c != stop) && (ptr < end));
52
53         if(ptr == end){
54                 printk("Failed to find '%c' in /proc/cpuinfo\n", stop);
55                 return(-1);
56         }
57         *(ptr - 1) = '\0';
58         return(c);
59 }
60
61 static int find_cpuinfo_line(int fd, char *key, char *scratch, int len)
62 {
63         int n;
64         char c;
65
66         scratch[len - 1] = '\0';
67         while(1){
68                 c = token(fd, scratch, len - 1, ':');
69                 if(c <= 0)
70                         return(0);
71                 else if(c != ':'){
72                         printk("Failed to find ':' in /proc/cpuinfo\n");
73                         return(0);
74                 }
75
76                 if(!strncmp(scratch, key, strlen(key)))
77                         return(1);
78
79                 do {
80                         n = os_read_file(fd, &c, sizeof(c));
81                         if(n != sizeof(c)){
82                                 printk("Failed to find newline in "
83                                        "/proc/cpuinfo, err = %d\n", -n);
84                                 return(0);
85                         }
86                 } while(c != '\n');
87         }
88         return(0);
89 }
90
91 int cpu_feature(char *what, char *buf, int len)
92 {
93         int fd, ret = 0;
94
95         fd = os_open_file("/proc/cpuinfo", of_read(OPENFLAGS()), 0);
96         if(fd < 0){
97                 printk("Couldn't open /proc/cpuinfo, err = %d\n", -fd);
98                 return(0);
99         }
100
101         if(!find_cpuinfo_line(fd, what, buf, len)){
102                 printk("Couldn't find '%s' line in /proc/cpuinfo\n", what);
103                 goto out_close;
104         }
105
106         token(fd, buf, len, '\n');
107         ret = 1;
108
109  out_close:
110         os_close_file(fd);
111         return(ret);
112 }
113
114 /* Overrides for Emacs so that we follow Linus's tabbing style.
115  * Emacs will notice this stuff at the end of the file and automatically
116  * adjust the settings for this buffer only.  This must remain at the end
117  * of the file.
118  * ---------------------------------------------------------------------------
119  * Local variables:
120  * c-file-style: "linux"
121  * End:
122  */