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lxdream.org :: lxdream/src/sh4/sh4core.h
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4core.h
changeset 617:476a717a54f3
prev603:11564af1448b
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  * $Id$
     3  * 
     4  * This file defines the internal functions exported/used by the SH4 core, 
     5  * except for disassembly functions defined in sh4dasm.h
     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 sh4core_H
    21 #define sh4core_H 1
    23 #include <glib/gtypes.h>
    24 #include <stdint.h>
    25 #include <stdio.h>
    26 #include "mem.h"
    27 #include "sh4/sh4.h"
    29 #ifdef __cplusplus
    30 extern "C" {
    31 #endif
    33 /* Breakpoint data structure */
    34 extern struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];
    35 extern int sh4_breakpoint_count;
    36 extern sh4ptr_t sh4_main_ram;
    37 extern gboolean sh4_starting;
    39 /**
    40  * Cached direct pointer to the current instruction page. If AT is on, this
    41  * is derived from the ITLB, otherwise this will be the entire memory region.
    42  * This is actually a fairly useful optimization, as we can make a lot of
    43  * assumptions about the "current page" that we can't make in general for
    44  * arbitrary virtual addresses.
    45  */
    46 struct sh4_icache_struct {
    47     sh4ptr_t page; // Page pointer (NULL if no page)
    48     sh4vma_t page_vma; // virtual address of the page.
    49     sh4addr_t page_ppa; // physical address of the page
    50     uint32_t mask;  // page mask 
    51 };
    52 extern struct sh4_icache_struct sh4_icache;
    54 /**
    55  * Test if a given address is contained in the current icache entry
    56  */
    57 #define IS_IN_ICACHE(addr) (sh4_icache.page_vma == ((addr) & sh4_icache.mask))
    58 /**
    59  * Return a pointer for the given vma, under the assumption that it is
    60  * actually contained in the current icache entry.
    61  */
    62 #define GET_ICACHE_PTR(addr) (sh4_icache.page + ((addr)-sh4_icache.page_vma))
    63 /**
    64  * Return the physical (external) address for the given vma, assuming that it is
    65  * actually contained in the current icache entry.
    66  */
    67 #define GET_ICACHE_PHYS(addr) (sh4_icache.page_ppa + ((addr)-sh4_icache.page_vma))
    69 /**
    70  * Return the virtual (vma) address for the first address past the end of the 
    71  * cache entry. Assumes that there is in fact a current icache entry.
    72  */
    73 #define GET_ICACHE_END() (sh4_icache.page_vma + (~sh4_icache.mask) + 1)
    75 /* SH4 module functions */
    76 void sh4_init( void );
    77 void sh4_reset( void );
    78 void sh4_run( void );
    79 void sh4_stop( void );
    80 uint32_t sh4_run_slice( uint32_t nanos ); // Run single timeslice using emulator
    81 uint32_t sh4_xlat_run_slice( uint32_t nanos ); // Run single timeslice using translator
    82 uint32_t sh4_sleep_run_slice( uint32_t nanos ); // Run single timeslice while the CPU is asleep
    84 /* SH4 peripheral module functions */
    85 void CPG_reset( void );
    86 void DMAC_reset( void );
    87 void DMAC_run_slice( uint32_t );
    88 void DMAC_save_state( FILE * );
    89 int DMAC_load_state( FILE * );
    90 void INTC_reset( void );
    91 void INTC_save_state( FILE *f );
    92 int INTC_load_state( FILE *f );
    93 void MMU_init( void );
    94 void MMU_reset( void );
    95 void MMU_save_state( FILE *f );
    96 int MMU_load_state( FILE *f );
    97 void MMU_ldtlb();
    98 void SCIF_reset( void );
    99 void SCIF_run_slice( uint32_t );
   100 void SCIF_save_state( FILE *f );
   101 int SCIF_load_state( FILE *f );
   102 void SCIF_update_line_speed(void);
   103 void TMU_reset( void );
   104 void TMU_run_slice( uint32_t );
   105 void TMU_save_state( FILE * );
   106 int TMU_load_state( FILE * );
   107 void TMU_update_clocks( void );
   109 /* SH4 instruction support methods */
   110 void sh4_sleep( void );
   111 void sh4_fsca( uint32_t angle, float *fr );
   112 void sh4_ftrv( float *fv, float *xmtrx );
   113 uint32_t sh4_read_sr(void);
   114 void sh4_write_sr(uint32_t val);
   115 void signsat48(void);
   116 gboolean sh4_has_page( sh4vma_t vma );
   118 /* SH4 Memory */
   119 #define MMU_VMA_ERROR 0x80000000
   120 /**
   121  * Update the sh4_icache structure to contain the specified vma. If the vma
   122  * cannot be resolved, an MMU exception is raised and the function returns
   123  * FALSE. Otherwise, returns TRUE and updates sh4_icache accordingly.
   124  * Note: If the vma resolves to a non-memory area, sh4_icache will be 
   125  * invalidated, but the function will still return TRUE.
   126  * @return FALSE if an MMU exception was raised, otherwise TRUE.
   127  */
   128 gboolean mmu_update_icache( sh4vma_t addr );
   130 /**
   131  * Resolve a virtual address through the TLB for a read operation, returning 
   132  * the resultant P4 or external address. If the resolution fails, the 
   133  * appropriate MMU exception is raised and the value MMU_VMA_ERROR is returned.
   134  * @return An external address (0x00000000-0x1FFFFFFF), a P4 address
   135  * (0xE0000000 - 0xFFFFFFFF), or MMU_VMA_ERROR.
   136  */
   137 sh4addr_t mmu_vma_to_phys_read( sh4vma_t addr );
   138 sh4addr_t mmu_vma_to_phys_write( sh4vma_t addr );
   139 sh4addr_t mmu_vma_to_phys_disasm( sh4vma_t addr );
   141 int64_t sh4_read_quad( sh4addr_t addr );
   142 int32_t sh4_read_long( sh4addr_t addr );
   143 int32_t sh4_read_word( sh4addr_t addr );
   144 int32_t sh4_read_byte( sh4addr_t addr );
   145 void sh4_write_quad( sh4addr_t addr, uint64_t val );
   146 void sh4_write_long( sh4addr_t addr, uint32_t val );
   147 void sh4_write_word( sh4addr_t addr, uint32_t val );
   148 void sh4_write_byte( sh4addr_t addr, uint32_t val );
   149 int32_t sh4_read_phys_word( sh4addr_t addr );
   150 gboolean sh4_flush_store_queue( sh4addr_t addr );
   152 /* SH4 Exceptions */
   153 #define EXC_POWER_RESET     0x000 /* reset vector */
   154 #define EXC_MANUAL_RESET    0x020 /* reset vector */
   155 #define EXC_TLB_MISS_READ   0x040 /* TLB vector */
   156 #define EXC_TLB_MISS_WRITE  0x060 /* TLB vector */
   157 #define EXC_INIT_PAGE_WRITE 0x080
   158 #define EXC_TLB_PROT_READ   0x0A0
   159 #define EXC_TLB_PROT_WRITE  0x0C0
   160 #define EXC_DATA_ADDR_READ  0x0E0
   161 #define EXC_DATA_ADDR_WRITE 0x100
   162 #define EXC_TLB_MULTI_HIT   0x140
   163 #define EXC_SLOT_ILLEGAL    0x1A0
   164 #define EXC_ILLEGAL         0x180
   165 #define EXC_TRAP            0x160
   166 #define EXC_FPU_DISABLED    0x800
   167 #define EXC_SLOT_FPU_DISABLED 0x820
   169 #define EXV_EXCEPTION    0x100  /* General exception vector */
   170 #define EXV_TLBMISS      0x400  /* TLB-miss exception vector */
   171 #define EXV_INTERRUPT    0x600  /* External interrupt vector */
   173 gboolean sh4_raise_exception( int );
   174 gboolean sh4_raise_reset( int );
   175 gboolean sh4_raise_trap( int );
   176 gboolean sh4_raise_slot_exception( int, int );
   177 gboolean sh4_raise_tlb_exception( int );
   178 void sh4_accept_interrupt( void );
   180 #define SIGNEXT4(n) ((((int32_t)(n))<<28)>>28)
   181 #define SIGNEXT8(n) ((int32_t)((int8_t)(n)))
   182 #define SIGNEXT12(n) ((((int32_t)(n))<<20)>>20)
   183 #define SIGNEXT16(n) ((int32_t)((int16_t)(n)))
   184 #define SIGNEXT32(n) ((int64_t)((int32_t)(n)))
   185 #define SIGNEXT48(n) ((((int64_t)(n))<<16)>>16)
   186 #define ZEROEXT32(n) ((int64_t)((uint64_t)((uint32_t)(n))))
   188 /* Status Register (SR) bits */
   189 #define SR_MD    0x40000000 /* Processor mode ( User=0, Privileged=1 ) */ 
   190 #define SR_RB    0x20000000 /* Register bank (priviledged mode only) */
   191 #define SR_BL    0x10000000 /* Exception/interupt block (1 = masked) */
   192 #define SR_FD    0x00008000 /* FPU disable */
   193 #define SR_M     0x00000200
   194 #define SR_Q     0x00000100
   195 #define SR_IMASK 0x000000F0 /* Interrupt mask level */
   196 #define SR_S     0x00000002 /* Saturation operation for MAC instructions */
   197 #define SR_T     0x00000001 /* True/false or carry/borrow */
   198 #define SR_MASK  0x700083F3
   199 #define SR_MQSTMASK 0xFFFFFCFC /* Mask to clear the flags we're keeping separately */
   200 #define SR_MDRB  0x60000000 /* MD+RB mask for convenience */
   202 #define IS_SH4_PRIVMODE() (sh4r.sr&SR_MD)
   203 #define SH4_INTMASK() ((sh4r.sr&SR_IMASK)>>4)
   204 #define SH4_EVENT_PENDING() (sh4r.event_pending <= sh4r.slice_cycle && !sh4r.in_delay_slot)
   206 #define FPSCR_FR     0x00200000 /* FPU register bank */
   207 #define FPSCR_SZ     0x00100000 /* FPU transfer size (0=32 bits, 1=64 bits) */
   208 #define FPSCR_PR     0x00080000 /* Precision (0=32 bites, 1=64 bits) */
   209 #define FPSCR_DN     0x00040000 /* Denormalization mode (1 = treat as 0) */
   210 #define FPSCR_CAUSE  0x0003F000
   211 #define FPSCR_ENABLE 0x00000F80
   212 #define FPSCR_FLAG   0x0000007C
   213 #define FPSCR_RM     0x00000003 /* Rounding mode (0=nearest, 1=to zero) */
   215 #define IS_FPU_DOUBLEPREC() (sh4r.fpscr&FPSCR_PR)
   216 #define IS_FPU_DOUBLESIZE() (sh4r.fpscr&FPSCR_SZ)
   217 #define IS_FPU_ENABLED() ((sh4r.sr&SR_FD)==0)
   219 #define FR(x) sh4r.fr_bank[(x)^1]
   220 #define DRF(x) ((double *)sh4r.fr_bank)[x]
   221 #define XF(x) sh4r.fr[((~sh4r.fpscr)&FPSCR_FR)>>21][(x)^1]
   222 #define XDR(x) ((double *)(sh4r.fr[((~sh4r.fpscr)&FPSCR_FR)>>21]))[x]
   223 #define DRb(x,b) ((double *)(sh4r.fr[((b ? (~sh4r.fpscr) : sh4r.fpscr)&FPSCR_FR)>>21]))[x]
   224 #define DR(x) DRb((x>>1), (x&1))
   225 #define FPULf   *((float *)&sh4r.fpul)
   226 #define FPULi    (sh4r.fpul)
   228 #define SH4_WRITE_STORE_QUEUE(addr,val) sh4r.store_queue[(addr>>2)&0xF] = val;
   230 #ifdef __cplusplus
   231 }
   232 #endif
   233 #endif
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