mirror of https://gitee.com/openkylin/linux.git
123 lines
2.3 KiB
C
123 lines
2.3 KiB
C
/*
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* Copyright 2003 PathScale, Inc.
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*
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* Licensed under the GPL
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*/
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#include "linux/sched.h"
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#include "linux/errno.h"
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#include "asm/system.h"
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#include "asm/pda.h"
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#include "sysdep/ptrace.h"
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#include "os.h"
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void arch_init_thread(void)
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{
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}
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void arch_check_bugs(void)
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{
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}
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int arch_handle_signal(int sig, union uml_pt_regs *regs)
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{
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return(0);
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}
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#define MAXTOKEN 64
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/* Set during early boot */
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int host_has_cmov = 1;
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int host_has_xmm = 0;
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static char token(int fd, char *buf, int len, char stop)
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{
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int n;
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char *ptr, *end, c;
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ptr = buf;
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end = &buf[len];
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do {
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n = os_read_file(fd, ptr, sizeof(*ptr));
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c = *ptr++;
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if(n != sizeof(*ptr)){
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if(n == 0) return(0);
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printk("Reading /proc/cpuinfo failed, err = %d\n", -n);
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if(n < 0)
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return(n);
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else
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return(-EIO);
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}
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} while((c != '\n') && (c != stop) && (ptr < end));
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if(ptr == end){
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printk("Failed to find '%c' in /proc/cpuinfo\n", stop);
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return(-1);
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}
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*(ptr - 1) = '\0';
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return(c);
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}
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static int find_cpuinfo_line(int fd, char *key, char *scratch, int len)
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{
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int n;
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char c;
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scratch[len - 1] = '\0';
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while(1){
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c = token(fd, scratch, len - 1, ':');
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if(c <= 0)
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return(0);
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else if(c != ':'){
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printk("Failed to find ':' in /proc/cpuinfo\n");
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return(0);
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}
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if(!strncmp(scratch, key, strlen(key)))
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return(1);
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do {
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n = os_read_file(fd, &c, sizeof(c));
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if(n != sizeof(c)){
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printk("Failed to find newline in "
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"/proc/cpuinfo, err = %d\n", -n);
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return(0);
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}
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} while(c != '\n');
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}
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return(0);
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}
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int cpu_feature(char *what, char *buf, int len)
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{
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int fd, ret = 0;
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fd = os_open_file("/proc/cpuinfo", of_read(OPENFLAGS()), 0);
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if(fd < 0){
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printk("Couldn't open /proc/cpuinfo, err = %d\n", -fd);
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return(0);
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}
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if(!find_cpuinfo_line(fd, what, buf, len)){
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printk("Couldn't find '%s' line in /proc/cpuinfo\n", what);
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goto out_close;
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}
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token(fd, buf, len, '\n');
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ret = 1;
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out_close:
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os_close_file(fd);
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return(ret);
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}
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/* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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