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      1 /* $NetBSD: tc_machdep.h,v 1.9 2025/03/09 01:06:42 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 /*
     31  * Machine-specific definitions for TURBOchannel support.
     32  *
     33  * This file must typedef the following types:
     34  *
     35  *	tc_addr_t	TURBOchannel bus address
     36  *	tc_offset_t	TURBOchannel bus address difference (offset)
     37  *
     38  * This file must prototype or define the following functions
     39  * or macros (one or more of which may be no-ops):
     40  *
     41  *	tc_mb()		read/write memory barrier (any CPU<->memory
     42  *			reads/writes before must complete before any
     43  *			CPU<->memory reads/writes after).
     44  *	tc_wmb()	write memory barrier (any CPU<->memory writes
     45  *			before must complete before any CPU<->memory
     46  *			writes after).
     47  *	tc_syncbus()	sync TC bus; make sure CPU writes are
     48  *			propagated across the TURBOchannel bus.
     49  *	tc_badaddr()	return non-zero if the given address is invalid.
     50  *	TC_DENSE_TO_SPARSE()
     51  *			convert the given physical address in
     52  *			TURBOchannel dense space to the corresponding
     53  *			address in TURBOchannel sparse space.
     54  *	TC_PHYS_TO_UNCACHED()
     55  *			convert the given system memory physical address
     56  *			to the physical address of the corresponding
     57  *			region that is not cached.
     58  */
     59 
     60 typedef uint64_t	tc_addr_t;
     61 typedef int32_t		tc_offset_t;
     62 
     63 #define	tc_mb()		alpha_mb()
     64 #define	tc_wmb()	alpha_wmb()
     65 
     66 /*
     67  * A junk address to read from, to make sure writes are complete.  See
     68  * System Programmer's Manual, section 9.3 (p. 9-4), and sacrifice a
     69  * chicken.
     70  */
     71 #define	tc_syncbus()							\
     72     do {								\
     73 	volatile uint32_t no_optimize;					\
     74 	/*								\
     75 	 * WMB does not order reads with respect to writes, so a	\
     76 	 * MB is required here.						\
     77 	 */								\
     78 	alpha_mb();							\
     79 	no_optimize =	 						\
     80 	    *(volatile uint32_t *)ALPHA_PHYS_TO_K0SEG(0x00000001f0080220); \
     81 	__USE(no_optimize);						\
     82     } while (/*CONSTCOND*/0)
     83 
     84 #define	tc_badaddr(tcaddr)						\
     85     badaddr((void *)(tcaddr), sizeof (uint32_t))
     86 
     87 #define	TC_SPACE_IND		0xffffffffe0000003
     88 #define	TC_SPACE_DENSE		0x0000000000000000
     89 #define TC_SPACE_DENSE_OFFSET	0x0000000007fffffc
     90 #define	TC_SPACE_SPARSE		0x0000000010000000
     91 #define	TC_SPACE_SPARSE_OFFSET	0x000000000ffffff8
     92 
     93 #define	TC_DENSE_TO_SPARSE(addr)					\
     94     (((addr) & TC_SPACE_IND) | TC_SPACE_SPARSE |			\
     95 	(((addr) & TC_SPACE_DENSE_OFFSET) << 1))
     96 
     97 #define	TC_PHYS_TO_UNCACHED(addr)					\
     98     (addr)
     99 
    100 /*
    101  * These functions are private, and may not be called by
    102  * machine-independent code.
    103  */
    104 void		tc_find_bootdev(device_t, void *);
    105 bus_space_tag_t	tc_bus_mem_init(void *memv);
    106 void		tc_dma_init(void);
    107 
    108 /*
    109  * Address of scatter/gather SRAM on the 3000/500-series.
    110  *
    111  * There is room for 32K entries, yielding 256M of sgva space.
    112  * The page table is readable in both dense and sparse space.
    113  * The page table is writable only in sparse space.
    114  *
    115  * In sparse space, the 32-bit PTEs are followed by 32-bits
    116  * of pad.
    117  */
    118 #define	TC_SGSRAM_DENSE		0x0000001c2800000UL
    119 #define	TC_SGSRAM_SPARSE	0x0000001d5000000UL
    120