1 /* $NetBSD: scu.h,v 1.2 2009/10/20 19:10:11 snj Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Leo Weppelman. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef _MACHINE_SCU_H 29 #define _MACHINE_SCU_H 30 /* 31 * Atari TT hardware: 32 * SCU registers 33 */ 34 35 #define SCU ((struct scu *)AD_SCU) 36 37 38 /* 39 * System control unit 40 */ 41 struct scu { 42 volatile u_char fil1; 43 volatile u_char sys_mask; /* System interrupt mask */ 44 volatile u_char fil2; 45 volatile u_char sys_stat; /* System interrupt status */ 46 volatile u_char fil3; 47 volatile u_char sys_int; /* System interrupter */ 48 volatile u_char fil4; 49 volatile u_char vme_int; /* VME interrupter */ 50 volatile u_char fil5; 51 volatile u_char gen_reg1; /* General purpose reg. 1 */ 52 volatile u_char fil6; 53 volatile u_char gen_reg2; /* General purpose reg. 2 */ 54 volatile u_char fil7; 55 volatile u_char vme_mask; /* VME interrupt mask */ 56 volatile u_char fil8; 57 volatile u_char vme_stat; /* VME interrupt status */ 58 }; 59 60 /* 61 * Bits for system mask & stat. 62 * Read 'sys_stat' first, reading 'sys_mask' clears pending bits in 'sys_stat'. 63 */ 64 #define SCU_SYSFAIL 0x80 /* _Sysfail in VME bus (Auto vectored) */ 65 #define SCU_MFP 0x40 /* MFP interrupt (Programmable) */ 66 #define SCU_SCC 0x20 /* SCC interrupt (Programmable) */ 67 #define SCU_VSYNC 0x10 /* Vertical Sync (Auto vectored) */ 68 /* 0x08 Not Used */ 69 #define SCU_HSYNC 0x04 /* Horizontal Sync (Auto vectored) */ 70 #define SCU_SYS_SOFT 0x02 /* System Software INT (Auto vectored) */ 71 /* 0x00 Not Used */ 72 73 /* 74 * Bits for VME mask & stat. 75 * Read 'vme_stat' first, reading 'vme_mask' clears pending bits in 'vme_stat'. 76 * Not that MFP/SCC interrupts are hard-wired to the mentioned VME IRQ's. 77 * (or'ed). 78 */ 79 #define SCU_IRQ7 0x80 80 #define SCU_IQ6_MFP 0x40 /* Also MFP interrupt */ 81 #define SCU_IRQ5_SCC 0x20 /* Also SCC interrupt */ 82 #define SCU_IRQ4 0x10 83 #define SCU_IRQ3_SOFT 0x08 /* Also VME Software interrupt */ 84 #define SCU_IRQ2 0x04 85 #define SCU_IRQ1 0x02 86 /* 0x00 Not Used */ 87 88 /* 89 * Generate/remove Software system interrupt. 90 * Note: Will not be cleared automatically!! 91 */ 92 #define SET_SOFT_INT (SCU->sys_int = 1) 93 #define CLR_SOFT_INT (SCU->sys_int = 0) 94 95 /* 96 * Generate/remove Software VME interrupt. 97 * Note: Will not be cleared automatically!! 98 */ 99 #define SET_VME_INT (SCU->vme_int = 1) 100 #define CLR_VME_INT (SCU->vme_int = 0) 101 #endif /* _MACHINE_SCU_H */ 102