2005-04-16 16:20:36 -06:00
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/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/signal.h>
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#include <asm/ldt.h>
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#include "kern_util.h"
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#include "user.h"
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#include "sysdep/ptrace.h"
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#include "task.h"
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#include "os.h"
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2006-09-26 00:33:00 -06:00
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#include "user_util.h"
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2005-04-16 16:20:36 -06:00
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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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static int check_cpu_flag(char *feature, int *have_it)
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{
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char buf[MAXTOKEN], c;
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2006-09-26 00:33:00 -06:00
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int fd, len = ARRAY_SIZE(buf);
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2005-04-16 16:20:36 -06:00
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printk("Checking for host processor %s support...", feature);
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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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2006-09-26 00:33:00 -06:00
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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*have_it = 0;
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2006-09-26 00:33:00 -06:00
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if(!find_cpuinfo_line(fd, "flags", buf, ARRAY_SIZE(buf)))
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2005-04-16 16:20:36 -06:00
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goto out;
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c = token(fd, buf, len - 1, ' ');
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if(c < 0) goto out;
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else if(c != ' '){
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printk("Failed to find ' ' in /proc/cpuinfo\n");
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goto out;
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}
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while(1){
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c = token(fd, buf, len - 1, ' ');
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if(c < 0) goto out;
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else if(c == '\n') break;
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if(!strcmp(buf, feature)){
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*have_it = 1;
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goto out;
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}
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}
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out:
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if(*have_it == 0) printk("No\n");
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else if(*have_it == 1) printk("Yes\n");
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os_close_file(fd);
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2006-09-26 00:33:00 -06:00
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return 1;
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2005-04-16 16:20:36 -06:00
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}
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#if 0 /* This doesn't work in tt mode, plus it's causing compilation problems
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* for some people.
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*/
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static void disable_lcall(void)
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{
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struct modify_ldt_ldt_s ldt;
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int err;
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bzero(&ldt, sizeof(ldt));
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ldt.entry_number = 7;
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ldt.base_addr = 0;
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ldt.limit = 0;
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err = modify_ldt(1, &ldt, sizeof(ldt));
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if(err)
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printk("Failed to disable lcall7 - errno = %d\n", errno);
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}
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#endif
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void arch_init_thread(void)
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{
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#if 0
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disable_lcall();
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#endif
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}
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void arch_check_bugs(void)
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{
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int have_it;
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if(os_access("/proc/cpuinfo", OS_ACC_R_OK) < 0){
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printk("/proc/cpuinfo not available - skipping CPU capability "
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"checks\n");
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return;
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}
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if(check_cpu_flag("cmov", &have_it))
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host_has_cmov = have_it;
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if(check_cpu_flag("xmm", &have_it))
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host_has_xmm = have_it;
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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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unsigned char tmp[2];
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/* This is testing for a cmov (0x0f 0x4x) instruction causing a
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* SIGILL in init.
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*/
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if((sig != SIGILL) || (TASK_PID(get_current()) != 1)) return(0);
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if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2))
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panic("SIGILL in init, could not read instructions!\n");
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if((tmp[0] != 0x0f) || ((tmp[1] & 0xf0) != 0x40))
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return(0);
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if(host_has_cmov == 0)
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panic("SIGILL caused by cmov, which this processor doesn't "
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"implement, boot a filesystem compiled for older "
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"processors");
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else if(host_has_cmov == 1)
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panic("SIGILL caused by cmov, which this processor claims to "
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"implement");
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else if(host_has_cmov == -1)
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panic("SIGILL caused by cmov, couldn't tell if this processor "
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"implements it, boot a filesystem compiled for older "
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"processors");
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else panic("Bad value for host_has_cmov (%d)", host_has_cmov);
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return(0);
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}
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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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