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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 1202:01ae5cbad4c8
prev1194:ee6ce5804608
next1218:be02e87f9f87
author nkeynes
date Mon Feb 13 20:00:27 2012 +1000 (8 years ago)
permissions -rw-r--r--
last change Fix MMU on non-translated platforms
- reintroduce old VMA translation functions (slightly modified)
- modify shadow processing to work on post-translated memory ops
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     1 /**
     2  * $Id$
     3  * 
     4  * This file defines the internal functions used by the SH4 core, 
     5  *
     6  * Copyright (c) 2005-2008 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #ifndef lxdream_sh4core_H
    20 #define lxdream_sh4core_H 1
    22 #include <glib/gtypes.h>
    23 #include <stdint.h>
    24 #include <stdio.h>
    25 #include "mem.h"
    26 #include "sh4/sh4.h"
    28 #ifdef __cplusplus
    29 extern "C" {
    30 #endif
    32 /* Breakpoint data structure */
    33 extern struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];
    34 extern int sh4_breakpoint_count;
    35 extern gboolean sh4_starting;
    37 /**
    38  * Cached direct pointer to the current instruction page. If AT is on, this
    39  * is derived from the ITLB, otherwise this will be the entire memory region.
    40  * This is actually a fairly useful optimization, as we can make a lot of
    41  * assumptions about the "current page" that we can't make in general for
    42  * arbitrary virtual addresses.
    43  */
    44 struct sh4_icache_struct {
    45     sh4ptr_t page; // Page pointer (NULL if no page)
    46     sh4vma_t page_vma; // virtual address of the page.
    47     sh4addr_t page_ppa; // physical address of the page
    48     uint32_t mask;  // page mask 
    49 };
    50 extern struct sh4_icache_struct sh4_icache;
    52 /**
    53  * Test if a given address is contained in the current icache entry
    54  */
    55 #define IS_IN_ICACHE(addr) (sh4_icache.page_vma == ((addr) & sh4_icache.mask))
    56 /**
    57  * Return a pointer for the given vma, under the assumption that it is
    58  * actually contained in the current icache entry.
    59  */
    60 #define GET_ICACHE_PTR(addr) (sh4_icache.page + ((addr)-sh4_icache.page_vma))
    61 /**
    62  * Return the physical (external) address for the given vma, assuming that it is
    63  * actually contained in the current icache entry.
    64  */
    65 #define GET_ICACHE_PHYS(addr) (sh4_icache.page_ppa + ((addr)-sh4_icache.page_vma))
    67 /**
    68  * Return the virtual (vma) address for the first address past the end of the 
    69  * cache entry. Assumes that there is in fact a current icache entry.
    70  */
    71 #define GET_ICACHE_END() (sh4_icache.page_vma + (~sh4_icache.mask) + 1)
    74 /**
    75  * SH4 vm-exit flag - exit the current block but continue normally
    76  */
    77 #define CORE_EXIT_CONTINUE 1
    79 /**
    80  * SH4 vm-exit flag - exit the current block and halt immediately (eg fatal error)
    81  */
    82 #define CORE_EXIT_HALT 2
    84 /**
    85  * SH4 vm-exit flag - exit the current block and halt immediately for a system
    86  * breakpoint.
    87  */
    88 #define CORE_EXIT_BREAKPOINT 3
    90 /**
    91  * SH4 vm-exit flag - exit the current block and continue after performing a full
    92  * system reset (dreamcast_reset())
    93  */
    94 #define CORE_EXIT_SYSRESET 4
    96 /**
    97  * SH4 vm-exit flag - exit the current block and continue after the next IRQ.
    98  */
    99 #define CORE_EXIT_SLEEP 5
   101 /**
   102  * SH4 vm-exit flag - exit the current block and flush all instruction caches (ie
   103  * if address translation has changed)
   104  */
   105 #define CORE_EXIT_FLUSH_ICACHE 6
   107 /**
   108  * SH4 vm-exit flag - exit the current block following a taken exception. sh4r.spc
   109  * is fixed up by recovery rather than sh4r.pc.
   110  */
   111 #define CORE_EXIT_EXCEPTION 7
   113 typedef uint32_t (*sh4_run_slice_fn)(uint32_t);
   115 /* SH4 module functions */
   116 void sh4_init( void );
   117 void sh4_reset( void );
   118 void sh4_run( void );
   119 void sh4_stop( void );
   120 uint32_t sh4_run_slice( uint32_t nanos ); // Run single timeslice using emulator
   121 uint32_t sh4_xlat_run_slice( uint32_t nanos ); // Run single timeslice using translator
   122 uint32_t sh4_sleep_run_slice( uint32_t nanos ); // Run single timeslice while the CPU is asleep
   124 /**
   125  * Immediately exit from the currently executing instruction with the given
   126  * exit code. This method does not return.
   127  */
   128 void sh4_core_exit( int exit_code );
   130 /**
   131  * Exit the current block at the end of the current instruction, flush the
   132  * translation cache (completely) and return control to sh4_xlat_run_slice.
   133  *
   134  * As a special case, if the current instruction is actually the last 
   135  * instruction in the block (ie it's in a delay slot), this function 
   136  * returns to allow normal completion of the translation block. Otherwise
   137  * this function never returns.
   138  *
   139  * Must only be invoked (indirectly) from within translated code.
   140  */
   141 void sh4_flush_icache();
   143 /* SH4 peripheral module functions */
   144 void CPG_reset( void );
   145 void DMAC_reset( void );
   146 void DMAC_run_slice( uint32_t );
   147 void DMAC_save_state( FILE * );
   148 int DMAC_load_state( FILE * );
   149 void INTC_reset( void );
   150 void INTC_save_state( FILE *f );
   151 int INTC_load_state( FILE *f );
   152 void MMU_init( void );
   153 void MMU_reset( void );
   154 void MMU_save_state( FILE *f );
   155 int MMU_load_state( FILE *f );
   156 void MMU_ldtlb();
   157 void CCN_reset();
   158 void CCN_set_cache_control( int reg );
   159 void CCN_save_state( FILE *f );
   160 int CCN_load_state( FILE *f );
   161 void SCIF_reset( void );
   162 void SCIF_run_slice( uint32_t );
   163 void SCIF_save_state( FILE *f );
   164 int SCIF_load_state( FILE *f );
   165 void SCIF_update_line_speed(void);
   166 void TMU_init( void );
   167 void TMU_reset( void );
   168 void TMU_run_slice( uint32_t );
   169 void TMU_save_state( FILE * );
   170 int TMU_load_state( FILE * );
   171 void TMU_update_clocks( void );
   172 void PMM_reset( void );
   173 void PMM_write_control( int, uint32_t );
   174 void PMM_save_state( FILE * );
   175 int PMM_load_state( FILE * );
   176 uint32_t PMM_run_slice( uint32_t );
   177 uint32_t sh4_translate_run_slice(uint32_t);
   178 uint32_t sh4_emulate_run_slice(uint32_t);
   180 /* SH4 instruction support methods */
   181 mem_region_fn_t FASTCALL sh7750_decode_address( sh4addr_t address );
   182 void FASTCALL sh7750_decode_address_copy( sh4addr_t address, mem_region_fn_t result );
   183 void FASTCALL sh4_sleep( void );
   184 void FASTCALL sh4_fsca( uint32_t angle, float *fr );
   185 void FASTCALL sh4_ftrv( float *fv );
   186 uint32_t FASTCALL sh4_read_sr(void);
   187 void FASTCALL sh4_write_sr(uint32_t val);
   188 void FASTCALL sh4_write_fpscr(uint32_t val);
   189 void FASTCALL sh4_switch_fr_banks(void);
   190 void FASTCALL signsat48(void);
   191 gboolean sh4_has_page( sh4vma_t vma );
   193 /* SH4 Memory */
   194 #define MMU_VMA_ERROR 0x80000000
   195 /**
   196  * Update the sh4_icache structure to contain the specified vma. If the vma
   197  * cannot be resolved, an MMU exception is raised and the function returns
   198  * FALSE. Otherwise, returns TRUE and updates sh4_icache accordingly.
   199  * Note: If the vma resolves to a non-memory area, sh4_icache will be 
   200  * invalidated, but the function will still return TRUE.
   201  * @return FALSE if an MMU exception was raised, otherwise TRUE.
   202  */
   203 gboolean FASTCALL mmu_update_icache( sh4vma_t addr );
   205 int64_t FASTCALL sh4_read_quad( sh4addr_t addr );
   206 int32_t FASTCALL sh4_read_long( sh4addr_t addr );
   207 int32_t FASTCALL sh4_read_word( sh4addr_t addr );
   208 int32_t FASTCALL sh4_read_byte( sh4addr_t addr );
   209 void FASTCALL sh4_write_quad( sh4addr_t addr, uint64_t val );
   210 void FASTCALL sh4_write_long( sh4addr_t addr, uint32_t val );
   211 void FASTCALL sh4_write_word( sh4addr_t addr, uint32_t val );
   212 void FASTCALL sh4_write_byte( sh4addr_t addr, uint32_t val );
   213 int32_t sh4_read_phys_word( sh4addr_t addr );
   214 void FASTCALL sh4_flush_store_queue( sh4addr_t addr );
   215 void FASTCALL sh4_flush_store_queue_mmu( sh4addr_t addr, void *exc );
   217 /* SH4 Exceptions */
   218 #define EXC_POWER_RESET     0x000 /* reset vector */
   219 #define EXC_MANUAL_RESET    0x020 /* reset vector */
   220 #define EXC_TLB_MISS_READ   0x040 /* TLB vector */
   221 #define EXC_TLB_MISS_WRITE  0x060 /* TLB vector */
   222 #define EXC_INIT_PAGE_WRITE 0x080
   223 #define EXC_TLB_PROT_READ   0x0A0
   224 #define EXC_TLB_PROT_WRITE  0x0C0
   225 #define EXC_DATA_ADDR_READ  0x0E0
   226 #define EXC_DATA_ADDR_WRITE 0x100
   227 #define EXC_TLB_MULTI_HIT   0x140
   228 #define EXC_SLOT_ILLEGAL    0x1A0
   229 #define EXC_ILLEGAL         0x180
   230 #define EXC_TRAP            0x160
   231 #define EXC_FPU_DISABLED    0x800
   232 #define EXC_SLOT_FPU_DISABLED 0x820
   234 #define EXV_EXCEPTION    0x100  /* General exception vector */
   235 #define EXV_TLBMISS      0x400  /* TLB-miss exception vector */
   236 #define EXV_INTERRUPT    0x600  /* External interrupt vector */
   238 void FASTCALL sh4_raise_exception( int );
   239 void FASTCALL sh4_raise_reset( int );
   240 void FASTCALL sh4_raise_trap( int );
   241 void FASTCALL sh4_raise_tlb_exception( int, sh4vma_t );
   242 void FASTCALL sh4_raise_tlb_multihit( sh4vma_t );
   243 void FASTCALL sh4_accept_interrupt( void );
   245 #define RAISE_TLB_ERROR(code, vpn) sh4_raise_tlb_exception(code, vpn)
   246 #define RAISE_MEM_ERROR(code, vpn) \
   247     MMIO_WRITE(MMU, TEA, vpn); \
   248     MMIO_WRITE(MMU, PTEH, ((MMIO_READ(MMU, PTEH) & 0x000003FF) | (vpn&0xFFFFFC00))); \
   249     sh4_raise_exception(code);
   250 #define RAISE_TLB_MULTIHIT_ERROR(vpn) sh4_raise_tlb_multihit(vpn)
   252 #ifdef HAVE_FRAME_ADDRESS
   253 #define SH4_EXCEPTION_EXIT() do{ *(((void * volatile *)__builtin_frame_address(0))+1) = exc; } while(0)
   254 #else
   255 #define SH4_EXCEPTION_EXIT() sh4_core_exit(CORE_EXIT_EXCEPTION)
   256 #endif
   258 /**
   259  * Helper method to update the SH4 registers for an exception, without
   260  * touching the MMU registers. Mainly for use in shadow mode.
   261  */
   262 void FASTCALL sh4_reraise_exception( sh4addr_t exception_pc );
   263 /**
   264  * Complete the current instruction as part of a core exit. Prevents the 
   265  * system from being left in an inconsistent state when an exit is 
   266  * triggered during a memory write. 
   267  */  
   268 void sh4_finalize_instruction( void );
   270 /* Status Register (SR) bits */
   271 #define SR_MD    0x40000000 /* Processor mode ( User=0, Privileged=1 ) */ 
   272 #define SR_RB    0x20000000 /* Register bank (priviledged mode only) */
   273 #define SR_BL    0x10000000 /* Exception/interupt block (1 = masked) */
   274 #define SR_FD    0x00008000 /* FPU disable */
   275 #define SR_M     0x00000200
   276 #define SR_Q     0x00000100
   277 #define SR_IMASK 0x000000F0 /* Interrupt mask level */
   278 #define SR_S     0x00000002 /* Saturation operation for MAC instructions */
   279 #define SR_T     0x00000001 /* True/false or carry/borrow */
   280 #define SR_MASK  0x700083F3
   281 #define SR_MQSTMASK 0xFFFFFCFC /* Mask to clear the flags we're keeping separately */
   282 #define SR_MDRB  0x60000000 /* MD+RB mask for convenience */
   284 #define IS_SH4_PRIVMODE() (sh4r.sr&SR_MD)
   285 #define SH4_INTMASK() ((sh4r.sr&SR_IMASK)>>4)
   286 #define SH4_EVENT_PENDING() (sh4r.event_pending <= sh4r.slice_cycle && !sh4r.in_delay_slot)
   288 #define FPSCR_FR     0x00200000 /* FPU register bank */
   289 #define FPSCR_SZ     0x00100000 /* FPU transfer size (0=32 bits, 1=64 bits) */
   290 #define FPSCR_PR     0x00080000 /* Precision (0=32 bites, 1=64 bits) */
   291 #define FPSCR_DN     0x00040000 /* Denormalization mode (1 = treat as 0) */
   292 #define FPSCR_CAUSE  0x0003F000
   293 #define FPSCR_ENABLE 0x00000F80
   294 #define FPSCR_FLAG   0x0000007C
   295 #define FPSCR_RM     0x00000003 /* Rounding mode (0=nearest, 1=to zero) */
   296 #define FPSCR_MASK   0x003FFFFF
   298 #define IS_FPU_DOUBLEPREC() (sh4r.fpscr&FPSCR_PR)
   299 #define IS_FPU_DOUBLESIZE() (sh4r.fpscr&FPSCR_SZ)
   300 #define IS_FPU_ENABLED() ((sh4r.sr&SR_FD)==0)
   302 #define FR(x) sh4r.fr[0][(x)^1]
   303 #define DRF(x) *((double *)&sh4r.fr[0][(x)<<1])
   304 #define XF(x) sh4r.fr[1][(x)^1]
   305 #define XDR(x) *((double *)&sh4r.fr[1][(x)<<1])
   306 #define DRb(x,b) *((double *)&sh4r.fr[b][(x)<<1])
   307 #define DR(x) *((double *)&sh4r.fr[x&1][x&0x0E])
   308 #define FPULf    (sh4r.fpul.f)
   309 #define FPULi    (sh4r.fpul.i)
   311 /**************** SH4 internal memory regions *****************/
   312 extern struct mem_region_fn p4_region_itlb_addr;
   313 extern struct mem_region_fn p4_region_itlb_data;
   314 extern struct mem_region_fn p4_region_utlb_addr;
   315 extern struct mem_region_fn p4_region_utlb_data;
   316 extern struct mem_region_fn p4_region_icache_addr;
   317 extern struct mem_region_fn p4_region_icache_data;
   318 extern struct mem_region_fn p4_region_ocache_addr;
   319 extern struct mem_region_fn p4_region_ocache_data;
   321 #define OC_ENABLED 1
   323 #ifdef __cplusplus
   324 }
   325 #endif
   327 #endif /* !lxdream_sh4core_H */
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