27  * NOTE: Herein lie back-to-back mb instructions.  They are magic. 
53  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 
54  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
61  * 	 7:2	Register number
65  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 
66  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
75  *	 7:2	register number
82  *	doesn't get shifted by 2 bits as we want to "drop" the bottom two
104 	mb();  in conf_read()
108 	mb();  in conf_read()
113 	mb();  in conf_read()
117 	mb();  in conf_read()
118 	mb();  /* magic */  in conf_read()
123 		mb();  in conf_read()
126 	mb();  in conf_read()
148 	*(vuip)MCPCIA_CAP_ERR(mid) = stat0; mb();  in conf_write()
155 	mb();  in conf_write()
159 	mb();  in conf_write()
160 	mb();  /* magic */  in conf_write()
163 	mb();  in conf_write()
212 	case 2:  in mcpcia_read_config()
250 	mb();  in mcpcia_pci_tbi()
262 	mb();  in mcpcia_probe_hose()
263 	mb();  in mcpcia_probe_hose()
267 	mcheck_expected(cpu) = 2;	/* indicates probing */  in mcpcia_probe_hose()
270 	mb();  in mcpcia_probe_hose()
275 	mb();  in mcpcia_probe_hose()
276 	mb();  /* magic */  in mcpcia_probe_hose()
280 		mb();  in mcpcia_probe_hose()
283 	mb();  in mcpcia_probe_hose()
339 	mb();  in mcpcia_pci_clr_err()
357 	mb();  in mcpcia_startup_hose()
363 	 * Window 0 is scatter-gather 8MB at 8MB (for isa)  in mcpcia_startup_hose()
365 	 * Window 2 is direct access 2GB at 2GB  in mcpcia_startup_hose()
393 	mb();  in mcpcia_startup_hose()
396 	mb();  in mcpcia_startup_hose()
399 	mb();  in mcpcia_startup_hose()
453 	for (i = 0; i < 24; i += 2) {  in mcpcia_print_uncorrectable()
457 	for (i = 0; i < 8; i += 2) {  in mcpcia_print_uncorrectable()
585 	mb();  in mcpcia_machine_check()
586 	mb();  /* magic */  in mcpcia_machine_check()
609 	mb();  in mcpcia_machine_check()