*/
#include <unistd.h>
-#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/signal.h>
+#include <asm/ldt.h>
#include "kern_util.h"
#include "user.h"
#include "sysdep/ptrace.h"
#include "task.h"
+#include "os.h"
#define MAXTOKEN 64
/* Set during early boot */
-int cpu_has_cmov = 1;
-int cpu_has_xmm = 0;
+int host_has_cmov = 1;
+int host_has_xmm = 0;
static char token(int fd, char *buf, int len, char stop)
{
ptr = buf;
end = &buf[len];
do {
- n = read(fd, ptr, sizeof(*ptr));
+ n = os_read_file(fd, ptr, sizeof(*ptr));
c = *ptr++;
- if(n == 0) return(0);
- else if(n != sizeof(*ptr)){
- printk("Reading /proc/cpuinfo failed, "
- "errno = %d\n", errno);
- return(-errno);
+ if(n != sizeof(*ptr)){
+ if(n == 0) return(0);
+ printk("Reading /proc/cpuinfo failed, err = %d\n", -n);
+ if(n < 0)
+ return(n);
+ else
+ return(-EIO);
}
} while((c != '\n') && (c != stop) && (ptr < end));
return(c);
}
-static int check_cpu_feature(char *feature, int *have_it)
+static int find_cpuinfo_line(int fd, char *key, char *scratch, int len)
{
- char buf[MAXTOKEN], c;
- int fd, len = sizeof(buf)/sizeof(buf[0]), n;
-
- printk("Checking for host processor %s support...", feature);
- fd = open("/proc/cpuinfo", O_RDONLY);
- if(fd < 0){
- printk("Couldn't open /proc/cpuinfo, errno = %d\n", errno);
- return(0);
- }
+ int n;
+ char c;
- *have_it = 0;
- buf[len - 1] = '\0';
+ scratch[len - 1] = '\0';
while(1){
- c = token(fd, buf, len - 1, ':');
- if(c <= 0) goto out;
+ c = token(fd, scratch, len - 1, ':');
+ if(c <= 0)
+ return(0);
else if(c != ':'){
printk("Failed to find ':' in /proc/cpuinfo\n");
- goto out;
+ return(0);
}
- if(!strncmp(buf, "flags", strlen("flags"))) break;
+ if(!strncmp(scratch, key, strlen(key)))
+ return(1);
do {
- n = read(fd, &c, sizeof(c));
+ n = os_read_file(fd, &c, sizeof(c));
if(n != sizeof(c)){
printk("Failed to find newline in "
- "/proc/cpuinfo, n = %d, errno = %d\n",
- n, errno);
- goto out;
+ "/proc/cpuinfo, err = %d\n", -n);
+ return(0);
}
} while(c != '\n');
}
+ return(0);
+}
+
+int cpu_feature(char *what, char *buf, int len)
+{
+ int fd, ret = 0;
+
+ fd = os_open_file("/proc/cpuinfo", of_read(OPENFLAGS()), 0);
+ if(fd < 0){
+ printk("Couldn't open /proc/cpuinfo, err = %d\n", -fd);
+ return(0);
+ }
+
+ if(!find_cpuinfo_line(fd, what, buf, len)){
+ printk("Couldn't find '%s' line in /proc/cpuinfo\n", what);
+ goto out_close;
+ }
+
+ token(fd, buf, len, '\n');
+ ret = 1;
+
+ out_close:
+ os_close_file(fd);
+ return(ret);
+}
+
+static int check_cpu_flag(char *feature, int *have_it)
+{
+ char buf[MAXTOKEN], c;
+ int fd, len = sizeof(buf)/sizeof(buf[0]);
+
+ printk("Checking for host processor %s support...", feature);
+ fd = os_open_file("/proc/cpuinfo", of_read(OPENFLAGS()), 0);
+ if(fd < 0){
+ printk("Couldn't open /proc/cpuinfo, err = %d\n", -fd);
+ return(0);
+ }
+
+ *have_it = 0;
+ if(!find_cpuinfo_line(fd, "flags", buf, sizeof(buf) / sizeof(buf[0])))
+ goto out;
c = token(fd, buf, len - 1, ' ');
if(c < 0) goto out;
else if(c != ' '){
- printk("Failed to find ':' in /proc/cpuinfo\n");
+ printk("Failed to find ' ' in /proc/cpuinfo\n");
goto out;
}
out:
if(*have_it == 0) printk("No\n");
else if(*have_it == 1) printk("Yes\n");
- close(fd);
+ os_close_file(fd);
return(1);
}
+#if 0 /* This doesn't work in tt mode, plus it's causing compilation problems
+ * for some people.
+ */
+static void disable_lcall(void)
+{
+ struct modify_ldt_ldt_s ldt;
+ int err;
+
+ bzero(&ldt, sizeof(ldt));
+ ldt.entry_number = 7;
+ ldt.base_addr = 0;
+ ldt.limit = 0;
+ err = modify_ldt(1, &ldt, sizeof(ldt));
+ if(err)
+ printk("Failed to disable lcall7 - errno = %d\n", errno);
+}
+#endif
+
+void arch_init_thread(void)
+{
+#if 0
+ disable_lcall();
+#endif
+}
+
void arch_check_bugs(void)
{
int have_it;
- if(access("/proc/cpuinfo", R_OK)){
+ if(os_access("/proc/cpuinfo", OS_ACC_R_OK) < 0){
printk("/proc/cpuinfo not available - skipping CPU capability "
"checks\n");
return;
}
- if(check_cpu_feature("cmov", &have_it)) cpu_has_cmov = have_it;
- if(check_cpu_feature("xmm", &have_it)) cpu_has_xmm = have_it;
+ if(check_cpu_flag("cmov", &have_it))
+ host_has_cmov = have_it;
+ if(check_cpu_flag("xmm", &have_it))
+ host_has_xmm = have_it;
}
int arch_handle_signal(int sig, union uml_pt_regs *regs)
{
- unsigned long ip;
+ unsigned char tmp[2];
/* This is testing for a cmov (0x0f 0x4x) instruction causing a
* SIGILL in init.
*/
if((sig != SIGILL) || (TASK_PID(get_current()) != 1)) return(0);
- ip = UPT_IP(regs);
- if((*((char *) ip) != 0x0f) || ((*((char *) (ip + 1)) & 0xf0) != 0x40))
+ if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2))
+ panic("SIGILL in init, could not read instructions!\n");
+ if((tmp[0] != 0x0f) || ((tmp[1] & 0xf0) != 0x40))
return(0);
- if(cpu_has_cmov == 0)
+ if(host_has_cmov == 0)
panic("SIGILL caused by cmov, which this processor doesn't "
"implement, boot a filesystem compiled for older "
"processors");
- else if(cpu_has_cmov == 1)
+ else if(host_has_cmov == 1)
panic("SIGILL caused by cmov, which this processor claims to "
"implement");
- else if(cpu_has_cmov == -1)
+ else if(host_has_cmov == -1)
panic("SIGILL caused by cmov, couldn't tell if this processor "
"implements it, boot a filesystem compiled for older "
"processors");
- else panic("Bad value for cpu_has_cmov (%d)", cpu_has_cmov);
+ else panic("Bad value for host_has_cmov (%d)", host_has_cmov);
return(0);
}
git://git.onelab.eu / linux-2.6.git / blobdiff