pseries: Consolidate hack for RTAS display-character usage

Currently the pseries machine contains not one but two somewhat ugly hacks
to allow printing of early debug messages before the guest has properly
read the device tree.

First, we special case H_PUT_TERM_CHAR so that a vtermno of 0 (usually
invalid) will look for a suitable vty and use that.  This supports Linux's
early debug code which will use H_PUT_TERM_CHAR with vtermno==0 before
reading the device tree.  Second, we support the RTAS display-character call.
This takes no vtermno so we assume the address of the default first VTY.

This patch makes things more consistent by folding the second hack into the
first.  Now, display-character uses the existing vty_lookup() function to
do the same search for a suitable VTY.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

hw/spapr_rtas.c

@@ -44,8 +44,7 @@ static void rtas_display_character(sPAPREnvironment *spapr,
                                    uint32_t nret, target_ulong rets)
 {
     uint8_t c = rtas_ld(args, 0);
-    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus,
-                                                 SPAPR_VTY_BASE_ADDRESS);
+    VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
 
     if (!sdev) {
         rtas_st(rets, 0, -1);

hw/spapr_vio.h

@@ -117,6 +117,7 @@ uint64_t ldq_tce(VIOsPAPRDevice *dev, uint64_t taddr);
 
 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq);
 
+VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg);
 void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len);
 void spapr_vty_create(VIOsPAPRBus *bus, uint32_t reg, CharDriverState *chardev);
 void spapr_vlan_create(VIOsPAPRBus *bus, uint32_t reg, NICInfo *nd);

hw/spapr_vty.c

@@ -70,8 +70,6 @@ static int spapr_vty_init(VIOsPAPRDevice *sdev)
 }
 
 /* Forward declaration */
-static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg);
-
 static target_ulong h_put_term_char(CPUPPCState *env, sPAPREnvironment *spapr,
                                     target_ulong opcode, target_ulong *args)
 {
@@ -195,7 +193,7 @@ VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus)
     return selected;
 }
 
-static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)
+VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)
 {
     VIOsPAPRDevice *sdev;