31  * NOTE: Herein lie back-to-back mb instructions.  They are magic. 
59  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 
60  *  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
69  * Type 1:
71  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 
72  *  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
74  * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
109 			DBGC(("mk_conf_addr: device (%d) > 20, returning -1\n",  in mk_conf_addr()
111 			return -1;  in mk_conf_addr()
117 		/* type 1 configuration cycle: */  in mk_conf_addr()
118 		*type1 = 1;  in mk_conf_addr()
140 	mb();  in conf_read()
146 		mb();  in conf_read()
147 		*(vuip)APECS_IOC_HAXR2 = haxr2 | 1;  in conf_read()
152 	mcheck_expected(0) = 1;  in conf_read()
154 	mb();  in conf_read()
159 	asm volatile("ldl %0,%1; mb; mb" : "=r"(value) : "m"(*(vuip)addr)  in conf_read()
165 		mb();  in conf_read()
168 	mb();  in conf_read()
170 #if 1  in conf_read()
192 		mb();  in conf_read()
200 		*(vuip)APECS_IOC_HAXR2 = haxr2 & ~1;  in conf_read()
201 		mb();  in conf_read()
220 	mb();  in conf_write()
225 		mb();  in conf_write()
226 		*(vuip)APECS_IOC_HAXR2 = haxr2 | 1;  in conf_write()
230 	mcheck_expected(0) = 1;  in conf_write()
231 	mb();  in conf_write()
235 	mb();  in conf_write()
236 	mb();  /* magic */  in conf_write()
238 	mb();  in conf_write()
240 #if 1  in conf_write()
261 		mb();  in conf_write()
268 		*(vuip)APECS_IOC_HAXR2 = haxr2 & ~1;  in conf_write()
269 		mb();  in conf_write()
286 	mask = (size - 1) * 8;  in apecs_read_config()
304 	mask = (size - 1) * 8;  in apecs_write_config()
321 	mb();  in apecs_pci_tbi()
346 	 * Window 1 is direct access 1GB at 1GB  in apecs_init_arch()
347 	 * Window 2 is scatter-gather 8MB at 8MB (for isa)  in apecs_init_arch()
356 	*(vuip)APECS_IOC_PM1R = (__direct_map_size - 1) & 0xfff00000U;  in apecs_init_arch()
360 	*(vuip)APECS_IOC_PM2R = (hose->sg_isa->size - 1) & 0xfff00000;  in apecs_init_arch()
361 	*(vuip)APECS_IOC_TB2R = virt_to_phys(hose->sg_isa->ptes) >> 1;  in apecs_init_arch()
363 	apecs_pci_tbi(hose, 0, -1);  in apecs_init_arch()
372 	mb();  in apecs_init_arch()
384 		mb();  in apecs_pci_clr_err()
388 	mb();  in apecs_pci_clr_err()
410 	mb();  in apecs_machine_check()
411 	mb(); /* magic */  in apecs_machine_check()
415 	mb();  in apecs_machine_check()