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HatariWii/src/stMemory.c

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/*
Hatari - stMemory.c
This file is distributed under the GNU General Public License, version 2
or at your option any later version. Read the file gpl.txt for details.
ST Memory access functions.
*/
const char STMemory_fileid[] = "Hatari stMemory.c : " __DATE__ " " __TIME__;
#include "stMemory.h"
#include "configuration.h"
#include "floppy.h"
#include "gemdos.h"
#include "ioMem.h"
#include "log.h"
#include "memory.h"
#include "memorySnapShot.h"
#include "tos.h"
#include "vdi.h"
#include "m68000.h"
/* STRam points to our ST Ram. Unless the user enabled SMALL_MEM where we have
* to save memory, this includes all TOS ROM and IO hardware areas for ease
* and emulation speed - so we create a 16 MiB array directly here.
* But when the user turned on ENABLE_SMALL_MEM, this only points to a malloc'ed
* buffer with the ST RAM; the ROM and IO memory will be handled separately. */
#if ENABLE_SMALL_MEM
Uint8 *STRam;
#else
Uint8 STRam[16*1024*1024];
#endif
Uint32 STRamEnd; /* End of ST Ram, above this address is no-mans-land and ROM/IO memory */
/**
* Clear section of ST's memory space.
*/
static void STMemory_Clear(Uint32 StartAddress, Uint32 EndAddress)
{
memset(&STRam[StartAddress], 0, EndAddress-StartAddress);
}
/**
* Copy given memory area safely to Atari RAM.
* If the memory area isn't fully within RAM, only the valid parts are written.
* Useful for all kinds of IO operations.
*
* addr - destination Atari RAM address
* src - source Hatari memory address
* len - number of bytes to copy
* name - name / description if this memory copy for error messages
*
* Return true if whole copy was safe / valid.
*/
bool STMemory_SafeCopy(Uint32 addr, Uint8 *src, unsigned int len, const char *name)
{
Uint32 end;
if ( STMemory_CheckAreaType ( addr, len, ABFLAG_RAM ) )
{
memcpy(&STRam[addr], src, len);
return true;
}
Log_Printf(LOG_WARN, "Invalid '%s' RAM range 0x%x+%i!\n", name, addr, len);
for (end = addr + len; addr < end; addr++, src++)
{
if ( STMemory_CheckAreaType ( addr, 1, ABFLAG_RAM ) )
STRam[addr] = *src;
}
return false;
}
/**
* Save/Restore snapshot of RAM / ROM variables
* ('MemorySnapShot_Store' handles type)
*/
void STMemory_MemorySnapShot_Capture(bool bSave)
{
MemorySnapShot_Store(&STRamEnd, sizeof(STRamEnd));
/* Only save/restore area of memory machine is set to, eg 1Mb */
MemorySnapShot_Store(STRam, STRamEnd);
/* And Cart/TOS/Hardware area */
MemorySnapShot_Store(&RomMem[0xE00000], 0x200000);
}
/**
* Set default memory configuration, connected floppies, memory size and
* clear the ST-RAM area.
* As TOS checks hardware for memory size + connected devices on boot-up
* we set these values ourselves and fill in the magic numbers so TOS
* skips these tests.
*/
void STMemory_SetDefaultConfig(void)
{
int i;
int screensize, limit;
int memtop, phystop;
Uint8 nMemControllerByte;
Uint8 nFalcSysCntrl;
static const int MemControllerTable[] =
{
0x01, /* 512 KiB */
0x05, /* 1 MiB */
0x02, /* 2 MiB */
0x06, /* 2.5 MiB */
0x0A /* 4 MiB */
};
if (bRamTosImage)
{
/* Clear ST-RAM, excluding the RAM TOS image */
STMemory_Clear(0x00000000, TosAddress);
STMemory_Clear(TosAddress+TosSize, STRamEnd);
}
else
{
/* Clear whole ST-RAM */
STMemory_Clear(0x00000000, STRamEnd);
}
/* Mirror ROM boot vectors */
STMemory_WriteLong(0x00, STMemory_ReadLong(TosAddress));
STMemory_WriteLong(0x04, STMemory_ReadLong(TosAddress+4));
/* Fill in magic numbers to bypass TOS' memory tests for faster boot or
* if VDI resolution is enabled or if more than 4 MB of ram are used
* or if TT RAM added in Falcon mode.
* (for highest compatibility, those tests should not be bypassed in
* the common STF/STE cases as some programs like "Yolanda" rely on
* the RAM content after those tests) */
if ( ConfigureParams.System.bFastBoot
|| bUseVDIRes
|| ( ConfigureParams.Memory.nMemorySize > 4 && !bIsEmuTOS )
|| ( ( ConfigureParams.System.nMachineType == MACHINE_FALCON ) && TTmemory ) )
{
/* Write magic values to sysvars to signal valid config */
STMemory_WriteLong(0x420, 0x752019f3); /* memvalid */
STMemory_WriteLong(0x43a, 0x237698aa); /* memval2 */
STMemory_WriteLong(0x51a, 0x5555aaaa); /* memval3 */
/* If ST RAM detection is bypassed, we must also force TT RAM config if enabled */
if ( TTmemory )
STMemory_WriteLong ( 0x5a4 , 0x01000000 + TTmem_size ); /* ramtop */
else
STMemory_WriteLong ( 0x5a4 , 0 ); /* ramtop */
STMemory_WriteLong ( 0x5a8 , 0x1357bd13 ); /* ramvalid */
/* On Falcon, set bit6=1 at $ff8007 to simulate a warm start */
/* (else memory detection is not skipped after a cold start/reset) */
if ( ConfigureParams.System.nMachineType == MACHINE_FALCON )
STMemory_WriteByte ( 0xff8007, IoMem_ReadByte(0xff8007) | 0x40 );
/* On TT, set bit0=1 at $ff8e09 to simulate a warm start */
/* (else memory detection is not skipped after a cold start/reset) */
if ( ConfigureParams.System.nMachineType == MACHINE_TT )
STMemory_WriteByte ( 0xff8e09, IoMem_ReadByte(0xff8e09) | 0x01 );
}
/* Set memory size, adjust for extra VDI screens if needed. */
screensize = VDIWidth * VDIHeight / 8 * VDIPlanes;
/* Use 32 kiB in normal screen mode or when the screen size is smaller than 32 kiB */
if (!bUseVDIRes || screensize < 0x8000)
screensize = 0x8000;
/* mem top - upper end of user memory (right before the screen memory)
* memtop / phystop must be dividable by 512 or TOS crashes */
memtop = (STRamEnd - screensize) & 0xfffffe00;
/* phys top - 32k gap causes least issues with apps & TOS
* as that's the largest _common_ screen size. EmuTOS behavior
* depends on machine type.
*
* TODO: what to do about _native_ TT & Videl resolutions
* which size is >32k? Should memtop be adapted also for
* those?
*/
switch (ConfigureParams.System.nMachineType)
{
case MACHINE_FALCON:
/* TOS v4 doesn't work with VDI mode (yet), and
* EmuTOS works with correct gap, so use that */
phystop = STRamEnd;
break;
case MACHINE_TT:
/* For correct TOS v3 memory detection, phystop should be
* at the end of memory, not at memtop + 32k.
*
* However:
* - TOS v3 crashes/hangs if phystop-memtop gap is larger
* than largest real HW screen size (150k)
* - NVDI hangs if gap is larger than 32k in any other than
* monochrome mode
*/
if (VDIPlanes == 1)
limit = 1280*960/8;
else
limit = 0x8000;
if (screensize > limit)
{
phystop = memtop + limit;
fprintf(stderr, "WARNING: too large VDI mode for TOS v3 memory detection to work correctly!\n");
}
else
phystop = STRamEnd;
break;
default:
phystop = memtop + 0x8000;
}
STMemory_WriteLong(0x436, memtop);
STMemory_WriteLong(0x42e, phystop);
if (bUseVDIRes)
fprintf(stderr, "VDI mode memtop: 0x%x, phystop: 0x%x (screensize: %d kB, memtop->phystop: %d kB)\n",
memtop, phystop, (screensize+511) / 1024, (phystop-memtop+511) / 1024);
/* Set memory controller byte according to different memory sizes */
/* Setting per bank: %00=128k %01=512k %10=2Mb %11=reserved. - e.g. %1010 means 4Mb */
if (ConfigureParams.Memory.nMemorySize <= 4)
nMemControllerByte = MemControllerTable[ConfigureParams.Memory.nMemorySize];
else
nMemControllerByte = 0x0f;
STMemory_WriteByte(0x424, nMemControllerByte);
IoMem_WriteByte(0xff8001, nMemControllerByte);
if (ConfigureParams.System.nMachineType == MACHINE_FALCON)
{
/* Set the Falcon memory and monitor configuration register:
$ffff8006.b [R] 76543210 Monitor-memory
||||||||
|||||||+- RAM Wait Status
||||||| 0 = 1 Wait (default)
||||||| 1 = 0 Wait
||||||+-- Video Bus size ???
|||||| 0 = 16 Bit
|||||| 1 = 32 Bit (default)
||||++--- ROM Wait Status
|||| 00 = Reserved
|||| 01 = 2 Wait (default)
|||| 10 = 1 Wait
|||| 11 = 0 Wait
||++----- Falcon Memory
|| 00 = 1 MB
|| 01 = 4 MB
|| 10 = 14 MB
|| 11 = no boot !
++------- Monitor-Typ
00 - Monochrome (SM124)
01 - Color (SC1224)
10 - VGA Color
11 - Television
Bit 1 seems not to be well documented. It's used by TOS at bootup to compute the memory size.
After some tests, I get the following RAM values (Bits 5, 4, 1 are involved) :
00 = 512 Ko 20 = 8192 Ko
02 = 1024 Ko 22 = 14366 Ko
10 = 2048 Ko 30 = Illegal
12 = 4096 Ko 32 = Illegal
I use these values for Hatari's emulation.
I also set the bit 3 and 2 at value 01 are mentioned in the register description.
*/
if (ConfigureParams.Memory.nMemorySize == 14) /* 14 Meg */
nFalcSysCntrl = 0x26;
else if (ConfigureParams.Memory.nMemorySize == 8) /* 8 Meg */
nFalcSysCntrl = 0x24;
else if (ConfigureParams.Memory.nMemorySize == 4) /* 4 Meg */
nFalcSysCntrl = 0x16;
else if (ConfigureParams.Memory.nMemorySize == 2) /* 2 Meg */
nFalcSysCntrl = 0x14;
else if (ConfigureParams.Memory.nMemorySize == 1) /* 1 Meg */
nFalcSysCntrl = 0x06;
else
nFalcSysCntrl = 0x04; /* 512 Ko */
switch(ConfigureParams.Screen.nMonitorType) {
case MONITOR_TYPE_TV:
nFalcSysCntrl |= FALCON_MONITOR_TV;
break;
case MONITOR_TYPE_VGA:
nFalcSysCntrl |= FALCON_MONITOR_VGA;
break;
case MONITOR_TYPE_RGB:
nFalcSysCntrl |= FALCON_MONITOR_RGB;
break;
case MONITOR_TYPE_MONO:
nFalcSysCntrl |= FALCON_MONITOR_MONO;
break;
}
STMemory_WriteByte(0xff8006, nFalcSysCntrl);
}
/* Set TOS floppies */
STMemory_WriteWord(0x446, nBootDrive); /* Boot up on A(0) or C(2) */
/* Create connected drives mask (only for harddrives, don't change floppy drive detected by TOS) */
ConnectedDriveMask = STMemory_ReadLong(0x4c2); // Get initial drive mask (see what TOS thinks)
if (GEMDOS_EMU_ON)
{
for (i = 0; i < MAX_HARDDRIVES; i++)
{
if (emudrives[i] != NULL) // Is this GEMDOS drive enabled?
ConnectedDriveMask |= (1 << emudrives[i]->drive_number);
}
}
/* Set connected drives system variable.
* NOTE: some TOS images overwrite this value, see 'OpCode_SysInit', too */
STMemory_WriteLong(0x4c2, ConnectedDriveMask);
}
/**
* Check that the region of 'size' starting at 'addr' is entirely inside
* a memory bank of the same memory type
*/
bool STMemory_CheckAreaType ( Uint32 addr , int size , int mem_type )
{
addrbank *pBank;
pBank = &get_mem_bank ( addr );
if ( ( pBank->flags & mem_type ) == 0 )
{
fprintf(stderr, "pBank flags mismatch: 0x%x & 0x%x (RAM = 0x%x)\n", pBank->flags, mem_type, ABFLAG_RAM);
return false;
}
return pBank->check ( addr , size );
}
/**
* Check if an address points to a memory region that causes bus error
* This is used for blitter and other DMA chips that should not cause
* a bus error when accessing such regions (on the contrary of the CPU)
* Returns true if region gives bus error
*/
bool STMemory_CheckRegionBusError ( Uint32 addr )
{
return memory_region_bus_error ( addr );
}
/**
* Convert an address in the ST memory space to a direct pointer
* in the host memory.
*
* NOTE : Using this function to get a direct pointer to the memory should
* only be used after doing a call to valid_address or STMemory_CheckAreaType
* to ensure we don't try to access a non existing memory region.
* Basically, this function should be used only for addr in RAM or in ROM
*/
void *STMemory_STAddrToPointer ( Uint32 addr )
{
Uint8 *p;
if ( ConfigureParams.System.bAddressSpace24 == true )
addr &= 0x00ffffff; /* Only keep the 24 lowest bits */
p = get_real_address ( addr );
return (void *)p;
}
/**
* Those functions are directly accessing the memory of the corresponding
* bank, without calling its dedicated access handlers (they won't generate
* bus errors or address errors or update IO values)
* They are only used for internal work of the emulation, such as debugger,
* log to print the content of memory, intercepting gemdos/bios calls, ...
*
* These functions are not used by the CPU emulation itself, see memory.c
* for the functions that emulate real memory accesses.
*/
/**
* Write long/word/byte into memory.
* NOTE - value will be converted to 68000 endian
*/
void STMemory_Write ( Uint32 addr , Uint32 val , int size )
{
addrbank *pBank;
Uint8 *p;
//printf ( "mem direct write %x %x %d\n" , addr , val , size );
pBank = &get_mem_bank ( addr );
if ( pBank->baseaddr == NULL )
return; /* No real memory, do nothing */
addr -= pBank->start & pBank->mask;
addr &= pBank->mask;
p = pBank->baseaddr + addr;
/* We modify the memory, so we flush the instr/data caches if needed */
M68000_Flush_All_Caches ( addr , size );
if ( size == 4 )
do_put_mem_long ( p , val );
else if ( size == 2 )
do_put_mem_word ( p , (Uint16)val );
else
*p = (Uint8)val;
}
void STMemory_WriteLong ( Uint32 addr , Uint32 val )
{
STMemory_Write ( addr , val , 4 );
}
void STMemory_WriteWord ( Uint32 addr , Uint16 val )
{
STMemory_Write ( addr , (Uint32)val , 2 );
}
void STMemory_WriteByte ( Uint32 addr , Uint8 val )
{
STMemory_Write ( addr , (Uint32)val , 1 );
}
/**
* Read long/word/byte from memory.
* NOTE - value will be converted to 68000 endian
*/
Uint32 STMemory_Read ( Uint32 addr , int size )
{
addrbank *pBank;
Uint8 *p;
//printf ( "mem direct read %x %d\n" , addr , size );
pBank = &get_mem_bank ( addr );
if ( pBank->baseaddr == NULL )
return 0; /* No real memory, return 0 */
addr -= pBank->start & pBank->mask;
addr &= pBank->mask;
p = pBank->baseaddr + addr;
if ( size == 4 )
return do_get_mem_long ( p );
else if ( size == 2 )
return (Uint32)do_get_mem_word ( p );
else
return (Uint32)*p;
}
Uint32 STMemory_ReadLong ( Uint32 addr )
{
return (Uint32) STMemory_Read ( addr , 4 );
}
Uint16 STMemory_ReadWord ( Uint32 addr )
{
return (Uint16)STMemory_Read ( addr , 2 );
}
Uint8 STMemory_ReadByte ( Uint32 addr )
{
return (Uint8)STMemory_Read ( addr , 1 );
}
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