filename | src/syscall.c |
changeset | 102:844a3f2a76ff |
next | 561:533f6b478071 |
next | 586:2a3ba82cf243 |
author | nkeynes |
date | Wed Mar 22 14:29:02 2006 +0000 (18 years ago) |
permissions | -rw-r--r-- |
last change | Rename IDE DMA registers appropriately Remove forced irq hack Add correct irq handling for IDE Miscellaneous WIP for the GD-rom drive |
file | annotate | diff | log | raw |
nkeynes@102 | 1 | /** |
nkeynes@102 | 2 | * $Id: syscall.c,v 1.1 2006-03-13 12:38:34 nkeynes Exp $ |
nkeynes@102 | 3 | * |
nkeynes@102 | 4 | * Routines to add hook functions that are callable from the SH4 |
nkeynes@102 | 5 | * |
nkeynes@102 | 6 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@102 | 7 | * |
nkeynes@102 | 8 | * This program is free software; you can redistribute it and/or modify |
nkeynes@102 | 9 | * it under the terms of the GNU General Public License as published by |
nkeynes@102 | 10 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@102 | 11 | * (at your option) any later version. |
nkeynes@102 | 12 | * |
nkeynes@102 | 13 | * This program is distributed in the hope that it will be useful, |
nkeynes@102 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@102 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@102 | 16 | * GNU General Public License for more details. |
nkeynes@102 | 17 | */ |
nkeynes@102 | 18 | |
nkeynes@102 | 19 | #include "dream.h" |
nkeynes@102 | 20 | #include "mem.h" |
nkeynes@102 | 21 | #include "syscall.h" |
nkeynes@102 | 22 | #include "sh4/sh4core.h" |
nkeynes@102 | 23 | |
nkeynes@102 | 24 | |
nkeynes@102 | 25 | struct syscall_hook { |
nkeynes@102 | 26 | syscall_hook_func_t hook; |
nkeynes@102 | 27 | sh4addr_t vector; |
nkeynes@102 | 28 | } syscall_hooks[256]; |
nkeynes@102 | 29 | |
nkeynes@102 | 30 | void syscall_add_hook( uint32_t hook_id, syscall_hook_func_t hook ) |
nkeynes@102 | 31 | { |
nkeynes@102 | 32 | hook_id &= 0xFF; |
nkeynes@102 | 33 | if( syscall_hooks[hook_id].hook != NULL ) |
nkeynes@102 | 34 | WARN( "Overwriting existing hook %02X", hook_id ); |
nkeynes@102 | 35 | syscall_hooks[hook_id].hook = hook; |
nkeynes@102 | 36 | syscall_hooks[hook_id].vector = 0; |
nkeynes@102 | 37 | } |
nkeynes@102 | 38 | |
nkeynes@102 | 39 | void syscall_add_hook_vector( uint32_t hook_id, uint32_t vector_addr, |
nkeynes@102 | 40 | syscall_hook_func_t hook ) |
nkeynes@102 | 41 | { |
nkeynes@102 | 42 | hook_id &= 0xFF; |
nkeynes@102 | 43 | syscall_add_hook( hook_id, hook ); |
nkeynes@102 | 44 | syscall_hooks[hook_id].vector = vector_addr; |
nkeynes@102 | 45 | sh4_write_long( vector_addr, 0xFFFFFF00 + hook_id ); |
nkeynes@102 | 46 | } |
nkeynes@102 | 47 | |
nkeynes@102 | 48 | void syscall_invoke( uint32_t hook_id ) |
nkeynes@102 | 49 | { |
nkeynes@102 | 50 | hook_id &= 0xFF; |
nkeynes@102 | 51 | syscall_hook_func_t hook = syscall_hooks[hook_id].hook; |
nkeynes@102 | 52 | if( hook == NULL ) { |
nkeynes@102 | 53 | WARN( "Invoked non-existent hook %02X", hook_id ); |
nkeynes@102 | 54 | } else { |
nkeynes@102 | 55 | hook(hook_id); |
nkeynes@102 | 56 | } |
nkeynes@102 | 57 | } |
nkeynes@102 | 58 | |
nkeynes@102 | 59 | void syscall_repatch_vectors( ) |
nkeynes@102 | 60 | { |
nkeynes@102 | 61 | int i; |
nkeynes@102 | 62 | for( i=0; i<256; i++ ) { |
nkeynes@102 | 63 | if( syscall_hooks[i].hook != NULL && |
nkeynes@102 | 64 | syscall_hooks[i].vector != 0 ) { |
nkeynes@102 | 65 | sh4_write_long( syscall_hooks[i].vector, 0xFFFFFF00 + i ); |
nkeynes@102 | 66 | } |
nkeynes@102 | 67 | } |
nkeynes@102 | 68 | } |
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