[SPARC64]: Use ASI_SCRATCHPAD address 0x0 properly.

This is where the virtual address of the fault status
area belongs.

To set it up we don't make a hypervisor call, instead
we call OBP's SUNW,set-trap-table with the real address
of the fault status area as the second argument.  And
right before that call we write the virtual address into
ASI_SCRATCHPAD vaddr 0x0.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/prom/misc.c

@@ -136,6 +136,11 @@ void prom_set_trap_table(unsigned long tba)
 	p1275_cmd("SUNW,set-trap-table", P1275_INOUT(1, 0), tba);
 }
 
+void prom_set_trap_table_sun4v(unsigned long tba, unsigned long mmfsa)
+{
+	p1275_cmd("SUNW,set-trap-table", P1275_INOUT(2, 0), tba, mmfsa);
+}
+
 int prom_get_mmu_ihandle(void)
 {
 	int node, ret;