Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/um/sys-i386/bugs.c b/arch/um/sys-i386/bugs.c
new file mode 100644
index 0000000..41b0ab2
--- /dev/null
+++ b/arch/um/sys-i386/bugs.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.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 host_has_cmov = 1;
+int host_has_xmm = 0;
+
+static char token(int fd, char *buf, int len, char stop)
+{
+ int n;
+ char *ptr, *end, c;
+
+ ptr = buf;
+ end = &buf[len];
+ do {
+ n = os_read_file(fd, ptr, sizeof(*ptr));
+ c = *ptr++;
+ 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));
+
+ if(ptr == end){
+ printk("Failed to find '%c' in /proc/cpuinfo\n", stop);
+ return(-1);
+ }
+ *(ptr - 1) = '\0';
+ return(c);
+}
+
+static int find_cpuinfo_line(int fd, char *key, char *scratch, int len)
+{
+ int n;
+ char c;
+
+ scratch[len - 1] = '\0';
+ while(1){
+ c = token(fd, scratch, len - 1, ':');
+ if(c <= 0)
+ return(0);
+ else if(c != ':'){
+ printk("Failed to find ':' in /proc/cpuinfo\n");
+ return(0);
+ }
+
+ if(!strncmp(scratch, key, strlen(key)))
+ return(1);
+
+ do {
+ n = os_read_file(fd, &c, sizeof(c));
+ if(n != sizeof(c)){
+ printk("Failed to find newline in "
+ "/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");
+ goto out;
+ }
+
+ while(1){
+ c = token(fd, buf, len - 1, ' ');
+ if(c < 0) goto out;
+ else if(c == '\n') break;
+
+ if(!strcmp(buf, feature)){
+ *have_it = 1;
+ goto out;
+ }
+ }
+ out:
+ if(*have_it == 0) printk("No\n");
+ else if(*have_it == 1) printk("Yes\n");
+ 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(os_access("/proc/cpuinfo", OS_ACC_R_OK) < 0){
+ printk("/proc/cpuinfo not available - skipping CPU capability "
+ "checks\n");
+ return;
+ }
+ 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 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);
+
+ 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(host_has_cmov == 0)
+ panic("SIGILL caused by cmov, which this processor doesn't "
+ "implement, boot a filesystem compiled for older "
+ "processors");
+ else if(host_has_cmov == 1)
+ panic("SIGILL caused by cmov, which this processor claims to "
+ "implement");
+ 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 host_has_cmov (%d)", host_has_cmov);
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */