[OpenBIOS] sbus slot probing
Bob Breuer
breuerr at mc.net
Mon Aug 15 17:01:51 CEST 2011
Here's a preliminary patch for sbus slot probing.
This can be used for the preliminary dbri device patch, see my dbri-pre1
branch at github: https://github.com/breuerr/qemu/tree/dbri-pre1
That branch also has a rewritten fcode rom to avoid the use of the
obsolete intr forth word. Use the SS-20 machine to get the dbri device.
Todo:
non-faulting reads so that an empty slot can be probed
extend to probe other (all?) slots as well
only add the slot E range for SS-20, but not SS-10
Is there any existing code for sparc32 which does a non-faulting read? It
looks like even cpeek doesn't try to catch any faults.
Bob
Index: drivers/sbus.c
===================================================================
--- drivers/sbus.c (revision 1046)
+++ drivers/sbus.c (working copy)
@@ -451,11 +451,36 @@
static void
sbus_probe_slot_ss10(unsigned int slot, uint64_t base)
{
+ ucell fcode;
+ unsigned char start;
+
// OpenBIOS and Qemu don't know how to do Sbus probing
switch(slot) {
case 2: // SUNW,tcx
ob_tcx_init(slot, "/iommu/sbus/SUNW,tcx");
break;
+ case 0xe: // dbri
+ fcode = ofmem_map_io(base, 0x1000);
+ // TODO: non-faulting read
+ start = *(unsigned char*)fcode;
+ if (start == 0xfd || start == 0xf1) {
+ push_str("/iommu/sbus");
+ fword("select-dev");
+ fword("new-device");
+ push_str(NULL);
+ PUSH(0); // offset
+ PUSH(slot); // space
+ push_str("encode-unit");
+ fword("$call-parent");
+ fword("set-args");
+ PUSH(fcode);
+ PUSH(1);
+ fword("byte-load");
+ fword("finish-device");
+ fword("unselect-dev");
+ }
+ ofmem_unmap(fcode, 0x1000);
+ break;
case 0xf: // le, esp, bpp, power-management
ob_macio_init(slot, base, 0);
// Power management (APC) XXX should not exist
@@ -534,6 +559,7 @@
{ 1, 0, 0xe10000000ULL, 0x10000000,},
{ 2, 0, 0xe20000000ULL, 0x10000000,},
{ 3, 0, 0xe30000000ULL, 0x10000000,},
+ [0xe] = { 0xe, 0, 0xee0000000ULL, 0x10000000,},
[0xf] = { 0xf, 0, 0xef0000000ULL, 0x10000000,},
};
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