#include <sys/time.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <linux/version.h>
#include "validate.h"
#include "thread.h"
#include "gc.h"
\f
+int linux_sparc_siginfo_bug = 0;
-#ifdef sparc
-int early_kernel = 0;
-#endif
void os_init(void)
{
- /* Early versions of Linux don't support the mmap(..) functionality
- * that we need. */
+ /* Conduct various version checks: do we have enough mmap(), is
+ * this a sparc running 2.2, can we do threads? */
{
struct utsname name;
int major_version;
-#ifdef sparc
int minor_version;
-#endif
+ char *p;
uname(&name);
- major_version = atoi(name.release);
- if (major_version < 2) {
- lose("linux major version=%d (can't run in version < 2.0.0)",
+ p=name.release;
+ major_version = atoi(p);
+ p=strchr(p,'.')+1;
+ minor_version = atoi(p);
+ if (major_version<2) {
+ lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)",
major_version);
}
-#ifdef sparc
- /* KLUDGE: This will break if Linux moves to a uname() version number
- * that has more than one digit initially -- CSR, 2002-02-12 */
- minor_version = atoi(name.release+2);
- if (minor_version < 4) {
- FSHOW((stderr,"linux minor version=%d;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", minor_version));
- early_kernel = 1;
+#ifdef LISP_FEATURE_SB_THREAD
+ if ((major_version <2) || (major_version==2 && minor_version < 4)) {
+ lose("linux kernel 2.4 required for thread-enabled SBCL");
+ }
+#endif
+#ifdef LISP_FEATURE_SPARC
+ if ((major_version <2) || (major_version==2 && minor_version < 4)) {
+ FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", major_version,minor_version));
+ linux_sparc_siginfo_bug = 1;
}
#endif
}
#endif
}
-/* In Debian CMU CL ca. 2.4.9, it was possible to get an infinite
- * cascade of errors from do_mmap(..). This variable is a counter to
- * prevent that; when it counts down to zero, an error in do_mmap
- * causes the low-level monitor to be called. */
-int n_do_mmap_ignorable_errors = 3;
-/* Return 0 for success. */
-static int
-do_mmap(os_vm_address_t *addr, os_vm_size_t len, int flags)
-{
- /* We *must* have the memory where we expect it. */
- os_vm_address_t old_addr = *addr;
+#ifdef LISP_FEATURE_ALPHA
+/* The Alpha is a 64 bit CPU. SBCL is a 32 bit application. Due to all
+ * the places that assume we can get a pointer into a fixnum with no
+ * information loss, we have to make sure it allocates all its ram in the
+ * 0-2Gb region. */
- *addr = mmap(*addr, len, OS_VM_PROT_ALL, flags, -1, 0);
- if (*addr == MAP_FAILED ||
- ((old_addr != NULL) && (*addr != old_addr))) {
- FSHOW((stderr,
- "/retryable error in allocating memory from the OS\n"
- "(addr=0x%lx, len=0x%lx, flags=0x%lx)\n",
- (long) addr,
- (long) len,
- (long) flags));
- if (n_do_mmap_ignorable_errors > 0) {
- --n_do_mmap_ignorable_errors;
- } else {
- lose("too many errors in allocating memory from the OS");
- }
- perror("mmap");
- return 1;
- }
- return 0;
-}
+static void * under_2gb_free_pointer=DYNAMIC_1_SPACE_END;
+#endif
os_vm_address_t
os_validate(os_vm_address_t addr, os_vm_size_t len)
{
- if (addr) {
- int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED;
- os_vm_address_t base_addr = addr;
- do {
- /* KLUDGE: It looks as though this code allocates memory
- * in chunks of size no larger than 'magic', but why? What
- * is the significance of 0x1000000 here? Also, can it be
- * right that if the first few 'do_mmap' calls succeed,
- * then one fails, we leave the memory allocated by the
- * first few in place even while we return a code for
- * complete failure? -- WHN 19991020
- *
- * Peter Van Eynde writes (20000211)
- * This was done because the kernel would only check for
- * overcommit for every allocation seperately. So if you
- * had 16MB of free mem+swap you could allocate 16M. And
- * again, and again, etc.
- * This in [Linux] 2.X could be bad as they changed the memory
- * system. A side effect was/is (I don't really know) that
- * programs with a lot of memory mappings run slower. But
- * of course for 2.2.2X we now have the NO_RESERVE flag that
- * helps...
- *
- * FIXME: The logic is also flaky w.r.t. failed
- * allocations. If we make one or more successful calls to
- * do_mmap(..) before one fails, then we've allocated
- * memory, and we should ensure that it gets deallocated
- * sometime somehow. If this function's response to any
- * failed do_mmap(..) is to give up and return NULL (as in
- * sbcl-0.6.7), then any failed do_mmap(..) after any
- * successful do_mmap(..) causes a memory leak. */
- int magic = 0x1000000;
- if (len <= magic) {
- if (do_mmap(&addr, len, flags)) {
- return NULL;
- }
- len = 0;
- } else {
- if (do_mmap(&addr, magic, flags)) {
- return NULL;
- }
- addr += magic;
- len = len - magic;
- }
- } while (len > 0);
- return base_addr;
- } else {
- int flags = MAP_PRIVATE | MAP_ANONYMOUS;
- if (do_mmap(&addr, len, flags)) {
- return NULL;
- } else {
- return addr;
- }
+ int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
+ os_vm_address_t actual ;
+
+ if (addr)
+ flags |= MAP_FIXED;
+#ifdef LISP_FEATURE_ALPHA
+ else {
+ flags |= MAP_FIXED;
+ addr=under_2gb_free_pointer;
+ }
+#endif
+ actual = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
+ if (actual == MAP_FAILED || (addr && (addr!=actual))) {
+ perror("mmap");
+ return 0; /* caller should check this */
}
+
+#ifdef LISP_FEATURE_ALPHA
+
+ len=(len+(os_vm_page_size-1))&(~(os_vm_page_size-1));
+ under_2gb_free_pointer+=len;
+#endif
+
+ return actual;
}
void
projects / sbcl.git / blobdiff