/**

  * $Id$

  * 

  * This file defines the internal functions used by the SH4 core, 

  *

  * Copyright (c) 2005-2008 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #ifndef lxdream_sh4core_H

 #define lxdream_sh4core_H 1

 #include <glib/gtypes.h>

 #include <stdint.h>

 #include <stdio.h>

 #include "mem.h"

 #include "sh4/sh4.h"

 #ifdef __cplusplus

 extern "C" {

 #endif

 /* Breakpoint data structure */

 extern struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];

 extern int sh4_breakpoint_count;

 extern gboolean sh4_starting;

 /**

  * Cached direct pointer to the current instruction page. If AT is on, this

  * is derived from the ITLB, otherwise this will be the entire memory region.

  * This is actually a fairly useful optimization, as we can make a lot of

  * assumptions about the "current page" that we can't make in general for

  * arbitrary virtual addresses.

  */

 struct sh4_icache_struct {

     sh4ptr_t page; // Page pointer (NULL if no page)

     sh4vma_t page_vma; // virtual address of the page.

     sh4addr_t page_ppa; // physical address of the page

     uint32_t mask;  // page mask 

 };

 extern struct sh4_icache_struct sh4_icache;

 /**

  * Test if a given address is contained in the current icache entry

  */

 #define IS_IN_ICACHE(addr) (sh4_icache.page_vma == ((addr) & sh4_icache.mask))

 /**

  * Return a pointer for the given vma, under the assumption that it is

  * actually contained in the current icache entry.

  */

 #define GET_ICACHE_PTR(addr) (sh4_icache.page + ((addr)-sh4_icache.page_vma))

 /**

  * Return the physical (external) address for the given vma, assuming that it is

  * actually contained in the current icache entry.

  */

 #define GET_ICACHE_PHYS(addr) (sh4_icache.page_ppa + ((addr)-sh4_icache.page_vma))

 /**

  * Return the virtual (vma) address for the first address past the end of the 

  * cache entry. Assumes that there is in fact a current icache entry.

  */

 #define GET_ICACHE_END() (sh4_icache.page_vma + (~sh4_icache.mask) + 1)

 /**

  * SH4 vm-exit flag - exit the current block but continue normally

  */

 #define CORE_EXIT_CONTINUE 1

 /**

  * SH4 vm-exit flag - exit the current block and halt immediately (eg fatal error)

  */

 #define CORE_EXIT_HALT 2

 /**

  * SH4 vm-exit flag - exit the current block and halt immediately for a system

  * breakpoint.

  */

 #define CORE_EXIT_BREAKPOINT 3

 /**

  * SH4 vm-exit flag - exit the current block and continue after performing a full

  * system reset (dreamcast_reset())

  */

 #define CORE_EXIT_SYSRESET 4

 /**

  * SH4 vm-exit flag - exit the current block and continue after the next IRQ.

  */

 #define CORE_EXIT_SLEEP 5

 /**

  * SH4 vm-exit flag - exit the current block and flush all instruction caches (ie

  * if address translation has changed)

  */

 #define CORE_EXIT_FLUSH_ICACHE 6

 /**

  * SH4 vm-exit flag - exit the current block following a taken exception. sh4r.spc

  * is fixed up by recovery rather than sh4r.pc.

  */

 #define CORE_EXIT_EXCEPTION 7

 typedef uint32_t (*sh4_run_slice_fn)(uint32_t);

 /* SH4 module functions */

 void sh4_init( void );

 void sh4_reset( void );

 void sh4_run( void );

 void sh4_stop( void );

 uint32_t sh4_run_slice( uint32_t nanos ); // Run single timeslice using emulator

 uint32_t sh4_xlat_run_slice( uint32_t nanos ); // Run single timeslice using translator

 uint32_t sh4_sleep_run_slice( uint32_t nanos ); // Run single timeslice while the CPU is asleep

 /**

  * Immediately exit from the currently executing instruction with the given

  * exit code. This method does not return.

  */

 void sh4_core_exit( int exit_code );

 /**

  * Exit the current block at the end of the current instruction, flush the

  * translation cache (completely) and return control to sh4_xlat_run_slice.

  *

  * As a special case, if the current instruction is actually the last 

  * instruction in the block (ie it's in a delay slot), this function 

  * returns to allow normal completion of the translation block. Otherwise

  * this function never returns.

  *

  * Must only be invoked (indirectly) from within translated code.

  */

 void sh4_flush_icache();

 /* SH4 peripheral module functions */

 void CPG_reset( void );

 void DMAC_reset( void );

 void DMAC_run_slice( uint32_t );

 void DMAC_save_state( FILE * );

 int DMAC_load_state( FILE * );

 void INTC_reset( void );

 void INTC_save_state( FILE *f );

 int INTC_load_state( FILE *f );

 void MMU_init( void );

 void MMU_reset( void );

 void MMU_save_state( FILE *f );

 int MMU_load_state( FILE *f );

 void MMU_ldtlb();

 void CCN_reset();

 void CCN_set_cache_control( int reg );

 void CCN_save_state( FILE *f );

 int CCN_load_state( FILE *f );

 void SCIF_reset( void );

 void SCIF_run_slice( uint32_t );

 void SCIF_save_state( FILE *f );

 int SCIF_load_state( FILE *f );

 void SCIF_update_line_speed(void);

 void TMU_init( void );

 void TMU_reset( void );

 void TMU_run_slice( uint32_t );

 void TMU_save_state( FILE * );

 int TMU_load_state( FILE * );

 void TMU_update_clocks( void );

 void PMM_reset( void );

 void PMM_write_control( int, uint32_t );

 void PMM_save_state( FILE * );

 int PMM_load_state( FILE * );

 uint32_t PMM_run_slice( uint32_t );

 uint32_t sh4_translate_run_slice(uint32_t);

 uint32_t sh4_emulate_run_slice(uint32_t);

 /* SH4 instruction support methods */

 mem_region_fn_t FASTCALL sh7750_decode_address( sh4addr_t address );

 void FASTCALL sh7750_decode_address_copy( sh4addr_t address, mem_region_fn_t result );

 void FASTCALL sh4_sleep( void );

 void FASTCALL sh4_fsca( uint32_t angle, float *fr );

 void FASTCALL sh4_ftrv( float *fv );

 uint32_t FASTCALL sh4_read_sr(void);

 void FASTCALL sh4_write_sr(uint32_t val);

 void FASTCALL sh4_write_fpscr(uint32_t val);

 void FASTCALL sh4_switch_fr_banks(void);

 void FASTCALL signsat48(void);

 gboolean sh4_has_page( sh4vma_t vma );

 /* SH4 Memory */

 #define MMU_VMA_ERROR 0x80000000

 /**

  * Update the sh4_icache structure to contain the specified vma. If the vma

  * cannot be resolved, an MMU exception is raised and the function returns

  * FALSE. Otherwise, returns TRUE and updates sh4_icache accordingly.

  * Note: If the vma resolves to a non-memory area, sh4_icache will be 

  * invalidated, but the function will still return TRUE.

  * @return FALSE if an MMU exception was raised, otherwise TRUE.

  */

 gboolean FASTCALL mmu_update_icache( sh4vma_t addr );

 int64_t FASTCALL sh4_read_quad( sh4addr_t addr );

 int32_t FASTCALL sh4_read_long( sh4addr_t addr );

 int32_t FASTCALL sh4_read_word( sh4addr_t addr );

 int32_t FASTCALL sh4_read_byte( sh4addr_t addr );

 void FASTCALL sh4_write_quad( sh4addr_t addr, uint64_t val );

 void FASTCALL sh4_write_long( sh4addr_t addr, uint32_t val );

 void FASTCALL sh4_write_word( sh4addr_t addr, uint32_t val );

 void FASTCALL sh4_write_byte( sh4addr_t addr, uint32_t val );

 int32_t sh4_read_phys_word( sh4addr_t addr );

 void FASTCALL sh4_flush_store_queue( sh4addr_t addr );

 void FASTCALL sh4_flush_store_queue_mmu( sh4addr_t addr, void *exc );

 /* SH4 Exceptions */

 #define EXC_POWER_RESET     0x000 /* reset vector */

 #define EXC_MANUAL_RESET    0x020 /* reset vector */

 #define EXC_TLB_MISS_READ   0x040 /* TLB vector */

 #define EXC_TLB_MISS_WRITE  0x060 /* TLB vector */

 #define EXC_INIT_PAGE_WRITE 0x080

 #define EXC_TLB_PROT_READ   0x0A0

 #define EXC_TLB_PROT_WRITE  0x0C0

 #define EXC_DATA_ADDR_READ  0x0E0

 #define EXC_DATA_ADDR_WRITE 0x100

 #define EXC_TLB_MULTI_HIT   0x140

 #define EXC_SLOT_ILLEGAL    0x1A0

 #define EXC_ILLEGAL         0x180

 #define EXC_TRAP            0x160

 #define EXC_FPU_DISABLED    0x800

 #define EXC_SLOT_FPU_DISABLED 0x820

 #define EXV_EXCEPTION    0x100  /* General exception vector */

 #define EXV_TLBMISS      0x400  /* TLB-miss exception vector */

 #define EXV_INTERRUPT    0x600  /* External interrupt vector */

 void FASTCALL sh4_raise_exception( int );

 void FASTCALL sh4_raise_reset( int );

 void FASTCALL sh4_raise_trap( int );

 void FASTCALL sh4_raise_tlb_exception( int, sh4vma_t );

 void FASTCALL sh4_raise_tlb_multihit( sh4vma_t );

 void FASTCALL sh4_accept_interrupt( void );

 #define RAISE_TLB_ERROR(code, vpn) sh4_raise_tlb_exception(code, vpn)

 #define RAISE_MEM_ERROR(code, vpn) \

     MMIO_WRITE(MMU, TEA, vpn); \

     MMIO_WRITE(MMU, PTEH, ((MMIO_READ(MMU, PTEH) & 0x000003FF) | (vpn&0xFFFFFC00))); \

     sh4_raise_exception(code);

 #define RAISE_TLB_MULTIHIT_ERROR(vpn) sh4_raise_tlb_multihit(vpn)

 #ifdef HAVE_FRAME_ADDRESS

 #define SH4_EXCEPTION_EXIT() do{ *(((void * volatile *)__builtin_frame_address(0))+1) = exc; } while(0)

 #else

 #define SH4_EXCEPTION_EXIT() sh4_core_exit(CORE_EXIT_EXCEPTION)

 #endif

 /**

  * Helper method to update the SH4 registers for an exception, without

  * touching the MMU registers. Mainly for use in shadow mode.

  */

 void FASTCALL sh4_reraise_exception( sh4addr_t exception_pc );

 /**

  * Complete the current instruction as part of a core exit. Prevents the 

  * system from being left in an inconsistent state when an exit is 

  * triggered during a memory write. 

  */  

 void sh4_finalize_instruction( void );

 /* Status Register (SR) bits */

 #define SR_MD    0x40000000 /* Processor mode ( User=0, Privileged=1 ) */ 

 #define SR_RB    0x20000000 /* Register bank (priviledged mode only) */

 #define SR_BL    0x10000000 /* Exception/interupt block (1 = masked) */

 #define SR_FD    0x00008000 /* FPU disable */

 #define SR_M     0x00000200

 #define SR_Q     0x00000100

 #define SR_IMASK 0x000000F0 /* Interrupt mask level */

 #define SR_S     0x00000002 /* Saturation operation for MAC instructions */

 #define SR_T     0x00000001 /* True/false or carry/borrow */

 #define SR_MASK  0x700083F3

 #define SR_MQSTMASK 0xFFFFFCFC /* Mask to clear the flags we're keeping separately */

 #define SR_MDRB  0x60000000 /* MD+RB mask for convenience */

 #define IS_SH4_PRIVMODE() (sh4r.sr&SR_MD)

 #define SH4_INTMASK() ((sh4r.sr&SR_IMASK)>>4)

 #define SH4_EVENT_PENDING() (sh4r.event_pending <= sh4r.slice_cycle && !sh4r.in_delay_slot)

 #define FPSCR_FR     0x00200000 /* FPU register bank */

 #define FPSCR_SZ     0x00100000 /* FPU transfer size (0=32 bits, 1=64 bits) */

 #define FPSCR_PR     0x00080000 /* Precision (0=32 bites, 1=64 bits) */

 #define FPSCR_DN     0x00040000 /* Denormalization mode (1 = treat as 0) */

 #define FPSCR_CAUSE  0x0003F000

 #define FPSCR_ENABLE 0x00000F80

 #define FPSCR_FLAG   0x0000007C

 #define FPSCR_RM     0x00000003 /* Rounding mode (0=nearest, 1=to zero) */

 #define FPSCR_MASK   0x003FFFFF

 #define IS_FPU_DOUBLEPREC() (sh4r.fpscr&FPSCR_PR)

 #define IS_FPU_DOUBLESIZE() (sh4r.fpscr&FPSCR_SZ)

 #define IS_FPU_ENABLED() ((sh4r.sr&SR_FD)==0)

 #define FR(x) sh4r.fr[0][(x)^1]

 #define DRF(x) *((double *)&sh4r.fr[0][(x)<<1])

 #define XF(x) sh4r.fr[1][(x)^1]

 #define XDR(x) *((double *)&sh4r.fr[1][(x)<<1])

 #define DRb(x,b) *((double *)&sh4r.fr[b][(x)<<1])

 #define DR(x) *((double *)&sh4r.fr[x&1][x&0x0E])

 #define FPULf    (sh4r.fpul.f)

 #define FPULi    (sh4r.fpul.i)

 /**************** SH4 internal memory regions *****************/

 extern struct mem_region_fn p4_region_itlb_addr;

 extern struct mem_region_fn p4_region_itlb_data;

 extern struct mem_region_fn p4_region_utlb_addr;

 extern struct mem_region_fn p4_region_utlb_data;

 extern struct mem_region_fn p4_region_icache_addr;

 extern struct mem_region_fn p4_region_icache_data;

 extern struct mem_region_fn p4_region_ocache_addr;

 extern struct mem_region_fn p4_region_ocache_data;

 #define OC_ENABLED 1

 #ifdef __cplusplus

 }

 #endif

 #endif /* !lxdream_sh4core_H */