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lxdream.org :: lxdream/src/sh4/sh4.h
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4.h
changeset 586:2a3ba82cf243
next669:ab344e42bca9
author nkeynes
date Fri Feb 08 00:06:56 2008 +0000 (12 years ago)
permissions -rw-r--r--
last change Fix LDS/STS to FPUL/FPSCR to check the FPU disabled bit. Fixes
the linux 2.4.0-test8 kernel boot
(this wasn't exactly very well documented in the original manual)
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     1 /**
     2  * $Id: sh4.h 577 2008-01-01 05:08:38Z nkeynes $
     3  * 
     4  * This file defines the public functions and definitions exported by the SH4
     5  * modules.
     6  *
     7  * Copyright (c) 2005 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    20 #ifndef lxdream_sh4_H
    21 #define lxdream_sh4_H 1
    23 #include "lxdream.h"
    24 #include "mem.h"
    26 #ifdef __cplusplus
    27 extern "C" {
    28 #endif
    31 /**
    32  * SH4 is running normally 
    33  */
    34 #define SH4_STATE_RUNNING 1
    35 /**
    36  * SH4 is not executing instructions but all peripheral modules are still
    37  * running
    38  */
    39 #define SH4_STATE_SLEEP 2
    40 /**
    41  * SH4 is not executing instructions, DMAC is halted, but all other peripheral
    42  * modules are still running
    43  */
    44 #define SH4_STATE_DEEP_SLEEP 3
    45 /**
    46  * SH4 is not executing instructions and all peripheral modules are also
    47  * stopped. As close as you can get to powered-off without actually being
    48  * off.
    49  */
    50 #define SH4_STATE_STANDBY 4
    52 /**
    53  * sh4r.event_types flag indicating a pending IRQ
    54  */
    55 #define PENDING_IRQ 1
    57 /**
    58  * sh4r.event_types flag indicating a pending event (from the event queue)
    59  */
    60 #define PENDING_EVENT 2
    62 /**
    63  * SH4 register structure
    64  */
    65 struct sh4_registers {
    66     uint32_t r[16];
    67     uint32_t sr, pr, pc, fpscr;
    68     uint32_t t, m, q, s; /* really boolean - 0 or 1 */
    69     int32_t fpul;
    70     float *fr_bank;
    71     float fr[2][16];
    72     uint64_t mac;
    73     uint32_t gbr, ssr, spc, sgr, dbr, vbr;
    75     uint32_t r_bank[8]; /* hidden banked registers */
    76     int32_t store_queue[16]; /* technically 2 banks of 32 bytes */
    78     uint32_t new_pc; /* Not a real register, but used to handle delay slots */
    79     uint32_t event_pending; /* slice cycle time of the next pending event, or FFFFFFFF
    80                              when no events are pending */
    81     uint32_t event_types; /* bit 0 = IRQ pending, bit 1 = general event pending */
    82     int in_delay_slot; /* flag to indicate the current instruction is in
    83                              * a delay slot (certain rules apply) */
    84     uint32_t slice_cycle; /* Current nanosecond within the timeslice */
    85     int sh4_state; /* Current power-on state (one of the SH4_STATE_* values ) */
    86 };
    88 extern struct sh4_registers sh4r;
    90 /**
    91  * Switch between translation and emulation execution modes. Note that this
    92  * should only be used while the system is stopped. If the system was built
    93  * without translation support, this method has no effect.
    94  *
    95  * @param use TRUE for translation mode, FALSE for emulation mode.
    96  */
    97 void sh4_set_use_xlat( gboolean use );
    99 /**
   100  * Test if system is currently using the translation engine.
   101  */
   102 gboolean sh4_is_using_xlat();
   104 /**
   105  * Explicitly set the SH4 PC to the supplied value - this will be the next
   106  * instruction executed. This should only be called while the system is stopped.
   107  */
   108 void sh4_set_pc( int pc );
   110 /**
   111  * Execute (using the emulator) a single instruction (in other words, perform a
   112  * single-step operation). 
   113  */
   114 gboolean sh4_execute_instruction( void );
   116 /* SH4 breakpoints */
   117 void sh4_set_breakpoint( uint32_t pc, breakpoint_type_t type );
   118 gboolean sh4_clear_breakpoint( uint32_t pc, breakpoint_type_t type );
   119 int sh4_get_breakpoint( uint32_t pc );
   121 #ifdef __cplusplus
   122 }
   123 #endif
   124 #endif /* !lxdream_sh4_H */
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