1 /* $NetBSD: tc_machdep.h,v 1.4 2000/06/01 00:04:50 cgd 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@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 u_int64_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 u_int32_t no_optimize; \ 74 no_optimize = \ 75 *(volatile u_int32_t *)ALPHA_PHYS_TO_K0SEG(0x00000001f0080220); \ 76 } while (0) 77 78 #define tc_badaddr(tcaddr) \ 79 badaddr((void *)(tcaddr), sizeof (u_int32_t)) 80 81 #define TC_SPACE_IND 0xffffffffe0000003 82 #define TC_SPACE_DENSE 0x0000000000000000 83 #define TC_SPACE_DENSE_OFFSET 0x0000000007fffffc 84 #define TC_SPACE_SPARSE 0x0000000010000000 85 #define TC_SPACE_SPARSE_OFFSET 0x000000000ffffff8 86 87 #define TC_DENSE_TO_SPARSE(addr) \ 88 (((addr) & TC_SPACE_IND) | TC_SPACE_SPARSE | \ 89 (((addr) & TC_SPACE_DENSE_OFFSET) << 1)) 90 91 #define TC_PHYS_TO_UNCACHED(addr) \ 92 (addr) 93 94 /* 95 * These functions are private, and may not be called by 96 * machine-independent code. 97 */ 98 bus_space_tag_t tc_bus_mem_init(void *memv); 99 void tc_dma_init(void); 100 101 /* 102 * Address of scatter/gather SRAM on the 3000/500-series. 103 * 104 * There is room for 32K entries, yielding 256M of sgva space. 105 * The page table is readable in both dense and sparse space. 106 * The page table is writable only in sparse space. 107 * 108 * In sparse space, the 32-bit PTEs are followed by 32-bits 109 * of pad. 110 */ 111 #define TC_SGSRAM_DENSE 0x0000001c2800000UL 112 #define TC_SGSRAM_SPARSE 0x0000001d5000000UL 113