sh: Tidy up the sh bios VBR handling.

This moves the VBR handling out of the main trap handling code and in to
the sh-bios helper code. A couple of accessors are added in order to
permit other kernel code to get at the VBR value for state save/restore
paths.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 25 deletions

diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index 86639beac3a2..efcbdfe52f52 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -31,6 +31,7 @@
 #include <asm/uaccess.h>
 #include <asm/fpu.h>
 #include <asm/kprobes.h>
+#include <asm/sh_bios.h>
 
 #ifdef CONFIG_CPU_SH2
 # define TRAP_RESERVED_INST     4
@@ -876,35 +877,10 @@ asmlinkage void do_exception_error(unsigned long r4, unsigned long r5,
         die_if_kernel("exception", regs, ex);
 }
 
-#if defined(CONFIG_SH_STANDARD_BIOS)
-void *gdb_vbr_vector;
-
-static inline void __init gdb_vbr_init(void)
-{
-        register unsigned long vbr;
-
-        /*
-         * Read the old value of the VBR register to initialise
-         * the vector through which debug and BIOS traps are
-         * delegated by the Linux trap handler.
-         */
-        asm volatile("stc vbr, %0" : "=r" (vbr));
-
-        gdb_vbr_vector = (void *)(vbr + 0x100);
-        printk("Setting GDB trap vector to 0x%08lx\n",
-               (unsigned long)gdb_vbr_vector);
-}
-#endif
-
 void __cpuinit per_cpu_trap_init(void)
 {
         extern void *vbr_base;
 
-#ifdef CONFIG_SH_STANDARD_BIOS
-        if (raw_smp_processor_id() == 0)
-                gdb_vbr_init();
-#endif
-
         /* NOTE: The VBR value should be at P1
            (or P2, virtural "fixed" address space).
            It's definitely should not in physical address.  */
@@ -959,6 +935,9 @@ void __init trap_init(void)
         set_exception_table_vec(TRAP_UBC, break_point_trap);
 #endif
 
+        /* Save off the BIOS VBR, if there is one */
+        sh_bios_vbr_init();
+
         /* Setup VBR for boot cpu */
         per_cpu_trap_init();
 }