detect ar7 at runtime in set_except_vector and remove useless volatile

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8824 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ar7/patches-2.6.22/100-board_support.patch b/target/linux/ar7/patches-2.6.22/100-board_support.patch
index 0297ef6..c7ea6cc 100644 (file)
--- a/target/linux/ar7/patches-2.6.22/100-board_support.patch
+++ b/target/linux/ar7/patches-2.6.22/100-board_support.patch
@@ -26,31 +26,35 @@ diff -urN linux-2.6.22/arch/mips/Kconfig linux-2.6.22.new/arch/mips/Kconfig
 diff -urN linux-2.6.22/arch/mips/kernel/traps.c linux-2.6.22.new/arch/mips/kernel/traps.c
 --- linux-2.6.22/arch/mips/kernel/traps.c      2007-07-09 01:32:17.000000000 +0200
 +++ linux-2.6.22.new/arch/mips/kernel/traps.c  2007-07-11 02:32:39.000000000 +0200
-@@ -1075,9 +1075,23 @@ void *set_except_vector(int n, void *addr)
+@@ -1074,11 +1074,23 @@ void *set_except_vector(int n, void *addr)
+       unsigned long old_handler = exception_handlers[n];
  
        exception_handlers[n] = handler;
-       if (n == 0 && cpu_has_divec) {
-+#ifdef CONFIG_AR7
-+              /* lui k0, 0x0000 */
-+              *(volatile u32 *)(ebase + 0x200) =
-+                              0x3c1a0000 | (handler >> 16);
-+              /* ori k0, 0x0000 */
-+              *(volatile u32 *)(ebase + 0x204) =
-+                              0x375a0000 | (handler & 0xffff);
-+              /* jr k0 */
-+              *(volatile u32 *)(ebase + 0x208) = 0x03400008;
-+              /* nop */
-+              *(volatile u32 *)(ebase + 0x20C) = 0x00000000;
-+              flush_icache_range(ebase + 0x200, ebase + 0x210);
-+#else
-               *(volatile u32 *)(ebase + 0x200) = 0x08000000 |
-                                                (0x03ffffff & (handler >> 2));
-               flush_icache_range(ebase + 0x200, ebase + 0x204);
-+#endif
-       }
+-      if (n == 0 && cpu_has_divec) {
+-              *(volatile u32 *)(ebase + 0x200) = 0x08000000 |
+-                                               (0x03ffffff & (handler >> 2));
+-              flush_icache_range(ebase + 0x200, ebase + 0x204);
+-      }
++      if (n == 0 && cpu_has_divec)
++              if ((handler ^ (ebase + 4)) & 0xfc000000) {
++                      /* lui k0, 0x0000 */
++                      *(u32 *)(ebase + 0x200) = 0x3c1a0000 | (handler >> 16);
++                      /* ori k0, 0x0000 */
++                      *(u32 *)(ebase + 0x204) =
++                                      0x375a0000 | (handler & 0xffff);
++                      /* jr k0 */
++                      *(u32 *)(ebase + 0x208) = 0x03400008;
++                      /* nop */
++                      *(u32 *)(ebase + 0x20C) = 0x00000000;
++                      flush_icache_range(ebase + 0x200, ebase + 0x210);
++              } else {
++                      *(volatile u32 *)(ebase + 0x200) =
++                              0x08000000 | (0x03ffffff & (handler >> 2));
++                      flush_icache_range(ebase + 0x200, ebase + 0x204);
++              }
        return (void *)old_handler;
  }
-
+ 
 diff -urN linux-2.6.22/arch/mips/Makefile linux-2.6.22.new/arch/mips/Makefile
 --- linux-2.6.22/arch/mips/Makefile    2007-07-09 01:32:17.000000000 +0200
 +++ linux-2.6.22.new/arch/mips/Makefile        2007-07-11 02:32:39.000000000 +0200