2003-08-20 Chris Demetriou <cgd@broadcom.com>

* mips/crt0_cfe.S: New file.
        * mips/cfe_mem.c: New file.
        * mips/cfe_prestart.S: Remove.
        * mips/cfe.ld: Adjust to use crt0_cfe.o as the startup file, and
        and use _start as the entry point.  Align BSS to 32-byte boundary.
        * mips/cfe.c: Reimplement to fit on top of a crt0_cfe.o file.
        * mips/cfe_api.h (__libcfe_stack_size, __libcfe_mem_limit)
        (__libcfe_meminit, __libcfe_stack_top): New prototypes.
        * mips/Makefile.in (CFEOBJS): Replace cfe_prestart.o with cfe_mem.o.
        (cfe.o, cfe_api.o, cfe_mem.o, crt0_cfe.o): New targets.
        * mips/configure.in: Build and install crt0_cfe.o when CFE support
        is built.
        * mips/configure: Regenerate.

libgloss/mips/cfe_mem.c

@@ -0,0 +1,130 @@
+/* cfe_mem.c -- Replaceable memory management hooks for MIPS boards
+   running CFE.  */
+
+/*
+ * Copyright 2003
+ * Broadcom Corporation. All rights reserved.
+ * 
+ * This software is furnished under license and may be used and copied only
+ * in accordance with the following terms and conditions.  Subject to these
+ * conditions, you may download, copy, install, use, modify and distribute
+ * modified or unmodified copies of this software in source and/or binary
+ * form. No title or ownership is transferred hereby.
+ * 
+ * 1) Any source code used, modified or distributed must reproduce and
+ *    retain this copyright notice and list of conditions as they appear in
+ *    the source file.
+ * 
+ * 2) No right is granted to use any trade name, trademark, or logo of
+ *    Broadcom Corporation.  The "Broadcom Corporation" name may not be
+ *    used to endorse or promote products derived from this software
+ *    without the prior written permission of Broadcom Corporation.
+ * 
+ * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
+ *    WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
+ *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
+ *    NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
+ *    FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
+ *    LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ */
+
+#include "cfe_api.h"
+
+/* Structure filled in by get_mem_info.  Only the size field is
+   actually used (by sbrk), so the others aren't even filled in.
+   Note that 'size' is the __size__ of the heap starting at _end!  */
+struct s_mem {
+  unsigned int size;
+  unsigned int icsize;
+  unsigned int dcsize;
+};
+
+void *get_mem_info (struct s_mem *);
+
+extern char _end[];
+
+/* Address immediately after available memory.  */
+static unsigned long memtop;
+
+/* Program stack size.  */
+static unsigned long stack_size;
+
+void
+__libcfe_meminit (void)
+{
+  /* If the user has provided a memory-limit function, use it to
+     determine the end of usable memory.  */
+  if (&__libcfe_mem_limit != NULL)
+    memtop = __libcfe_mem_limit ();
+  else
+    {
+      uint64_t start, length, type;
+      int i, rv;
+      long end_segbits, end_pa;
+
+      /* Note that this only works if _end and the program live in kseg0
+         or kseg1.  Not a problem with the default linker script, but
+         if you're writing your own, keep it in mind.  For more complex
+         memory allocation needs, you're encouraged to copy this file
+         and syscalls.c (for sbrk()), and reimplement as appropriate.  */
+      end_segbits = (long)_end & ~ 0x1fffffffL;
+      end_pa = (long)_end & 0x1fffffffL;
+
+      for (i = 0; ; i++)
+        {
+          rv = cfe_enummem(i, 0, &start, &length, &type);
+          if (rv < 0)
+            {
+              /* Did not find an available entry containing _end.
+                 Assume a minimal amount of memory (1MB).  */
+              memtop = _end + (1 * 1024 * 1024);
+              break;
+            }
+
+          /* If not available, try the next.  */
+          if (type != CFE_MI_AVAILABLE)
+            continue;
+
+          /* If end_pa is between start and (start + length) then we have
+	     a winner.  */
+          if (end_pa >= start && end_pa < (start + length))
+            {
+              memtop = (start + length) | end_segbits;
+              break;
+            }
+        }
+    }
+
+  /* If the user has provided a memory-limit function, use it to
+     determine the end of usable memory.  */
+  if (&__libcfe_stack_size != NULL)
+    stack_size = __libcfe_stack_size ();
+  else
+    stack_size = (32 * 1024);		/* Default = 32KB.  */
+
+  /* Chop the top of memory to a 32-byte aligned location, and
+     round the stack size up to a 32-byte multiple.  */
+  memtop = memtop & ~(unsigned long)31;
+  stack_size = (stack_size + 31) & ~(unsigned long)31;
+}
+
+void *
+__libcfe_stack_top (void)
+{
+  /* Grow down from the top of available memory.  Obviously, if
+     code writes above this limit, problems could result!  */
+  return (void *) memtop;
+}
+
+/* For compatibility, get_mem_info returns the top of memory
+   (i.e., the stack address).  Nothing actually uses that,
+   though.  */
+void *
+get_mem_info (struct s_mem *meminfo)
+{
+  meminfo->size = (char *)(memtop - stack_size) - _end;
+  return (void *) memtop;
+}