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sh: sh_bios detection.

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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>
This commit is contained in:
Paul Mundt 2010-01-12 18:42:52 +09:00
parent a99eae5417
commit 94cd049522
1 changed files with 11 additions and 4 deletions
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15
arch/sh/kernel/sh_bios.c
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@ -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");
}
/**