[PATCH] On v850, use a long jump to start_kernel

This allows the low-level start code to be located far away from the
rest of the kernel, which is sometimes necessary.

diff --git a/arch/v850/kernel/head.S b/arch/v850/kernel/head.S
index 6fad68e5196ddd7500b15c77a821d263ab3c76c5..c490b937ef141b059e9638e263465329003de2a6 100644 (file)
--- a/arch/v850/kernel/head.S
+++ b/arch/v850/kernel/head.S
@@ -1,8 +1,8 @@
 /*
  * arch/v850/kernel/head.S -- Lowest-level startup code
  *
- *  Copyright (C) 2001,02  NEC Corporation
- *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org>
+ *  Copyright (C) 2001,02,03  NEC Electronics Corporation
+ *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License.  See the file COPYING in the main directory of this
@@ -115,7 +115,14 @@ C_ENTRY(start):
        jarl    CSYM(memset), lp
 #endif
 
-       // Start Linux kernel.
+       // What happens if the main kernel function returns (it shouldn't)
        mov     hilo(CSYM(machine_halt)), lp
-       jr      CSYM(start_kernel)
+
+       // Start the linux kernel.  We use an indirect jump to get extra
+       // range, because on some platforms this initial startup code
+       // (and the associated platform-specific code in mach_early_init)
+       // are located far away from the main kernel, e.g. so that they
+       // can initialize RAM first and copy the kernel or something.
+       mov     hilo(CSYM(start_kernel)), r12
+       jmp     [r12]
 C_END(start)