sh: sh_bios detection.

This adds some VBR sanity checks in the sh_bios code to ensure that the
BIOS VBR is in range before blindly trapping in to it. This permits
boards with varying boot loader configurations to always leave support
for sh-bios enabled and it will just be disabled at run-time if not
found.

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

diff --git a/arch/sh/kernel/sh_bios.c b/arch/sh/kernel/sh_bios.c
index 29cd2526e5c4dc0c5c0f6d026756ce61f476b6a4..47475cca068a95e361eeba16845db285f13e1c58 100644 (file)
--- a/arch/sh/kernel/sh_bios.c
+++ b/arch/sh/kernel/sh_bios.c
@@ -23,6 +23,8 @@
 #define BIOS_CALL_SHUTDOWN             11
 #define BIOS_CALL_GDB_DETACH           0xff
 
+void *gdb_vbr_vector = NULL;
+
 static inline long sh_bios_call(long func, long arg0, long arg1, long arg2,
                                    long arg3)
 {
@@ -32,6 +34,9 @@ static inline long sh_bios_call(long func, long arg0, long arg1, long arg2,
        register long r6 __asm__("r6") = arg2;
        register long r7 __asm__("r7") = arg3;
 
+       if (!gdb_vbr_vector)
+               return -ENOSYS;
+
        __asm__ __volatile__("trapa     #0x3f":"=z"(r0)
                             :"0"(r0), "r"(r4), "r"(r5), "r"(r6), "r"(r7)
                             :"memory");
@@ -60,8 +65,6 @@ void sh_bios_shutdown(unsigned int how)
        sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
 }
 
-void *gdb_vbr_vector = NULL;
-
 /*
  * Read the old value of the VBR register to initialise the vector
  * through which debug and BIOS traps are delegated by the Linux trap
@@ -76,8 +79,12 @@ void sh_bios_vbr_init(void)
 
        __asm__ __volatile__ ("stc vbr, %0" : "=r" (vbr));
 
-       gdb_vbr_vector = (void *)(vbr + 0x100);
-       printk(KERN_NOTICE "Setting GDB trap vector to %p\n", gdb_vbr_vector);
+       if (vbr) {
+               gdb_vbr_vector = (void *)(vbr + 0x100);
+               printk(KERN_NOTICE "Setting GDB trap vector to %p\n",
+                      gdb_vbr_vector);
+       } else
+               printk(KERN_NOTICE "SH-BIOS not detected\n");
 }
 
 /**