Better ACPI implementation (currently only on PIIX4/PIIX4E/SMSC southbridges), finished the SMSC southbridge (but the Atrend BIOS still hangs, need to figure out why), and fixed Tandy EEPROM saving.

src/cpu_common/386_common.c

@@ -1077,6 +1077,9 @@ enter_smm(int in_hlt)
     smm_in_hlt = in_hlt;
 
     CPU_BLOCK_END();
+
+    // if (smbase == 0x000a0000)
+	// leave_smm();
 }
 
 
@@ -1132,6 +1135,10 @@ leave_smm(void)
     else if (is_p6)			/* Intel P6 (Pentium Pro, Pentium II, Celeron) */
 	smram_restore_state_p6(saved_state);
 
+    /* Maybe we need this? */
+    if (smbase == 0x00030000)
+	smbase = 0x000a0000;
+
     in_smm = 0;
     mem_mapping_recalc(0x00030000, 0x00020000);
     mem_mapping_recalc(0x000a0000, 0x00060000);