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1.1 root 1: /*
1.1.1.3 root 2: Hatari - stMemory.c
1.1 root 3:
1.1.1.3 root 4: This file is distributed under the GNU Public License, version 2 or at
5: your option any later version. Read the file gpl.txt for details.
6:
1.1.1.4 root 7: ST Memory access functions.
1.1 root 8: */
1.1.1.6 ! root 9: const char STMemory_rcsid[] = "Hatari $Id: stMemory.c,v 1.9 2006/02/21 14:15:35 thothy Exp $";
1.1 root 10:
1.1.1.4 root 11: #include "stMemory.h"
1.1.1.6 ! root 12: #include "configuration.h"
! 13: #include "floppy.h"
! 14: #include "ioMem.h"
! 15: #include "tos.h"
! 16: #include "vdi.h"
! 17: #include "uae-cpu/memory.h"
1.1.1.2 root 18:
1.1.1.4 root 19:
20: Uint8 STRam[16*1024*1024]; /* This is our ST Ram, includes all TOS/hardware areas for ease */
21: Uint32 STRamEnd; /* End of ST Ram, above this address is no-mans-land and hardware vectors */
1.1 root 22:
1.1.1.2 root 23:
24: /*-----------------------------------------------------------------------*/
1.1 root 25: /*
1.1.1.3 root 26: Clear section of ST's memory space.
1.1 root 27: */
1.1.1.5 root 28: void STMemory_Clear(Uint32 StartAddress, Uint32 EndAddress)
1.1 root 29: {
1.1.1.5 root 30: memset(&STRam[StartAddress], 0, EndAddress-StartAddress);
1.1 root 31: }
32:
1.1.1.6 ! root 33:
! 34: /*-----------------------------------------------------------------------*/
! 35: /*
! 36: Set default memory configuration, connected floppies, memory size and
! 37: clear the ST-RAM area.
! 38: As TOS checks hardware for memory size + connected devices on boot-up
! 39: we set these values ourselves and fill in the magic numbers so TOS
! 40: skips these tests.
! 41: */
! 42: void STMemory_SetDefaultConfig(void)
! 43: {
! 44: int i;
! 45: Uint8 nMemControllerByte;
! 46: static const int MemControllerTable[] =
! 47: {
! 48: 0x01, /* 512 KiB */
! 49: 0x05, /* 1 MiB */
! 50: 0x02, /* 2 MiB */
! 51: 0x06, /* 2.5 MiB */
! 52: 0x0A /* 4 MiB */
! 53: };
! 54:
! 55: /* Calculate end of RAM */
! 56: if (ConfigureParams.Memory.nMemorySize > 0 && ConfigureParams.Memory.nMemorySize <= 14)
! 57: STRamEnd = ConfigureParams.Memory.nMemorySize * 0x100000;
! 58: else
! 59: STRamEnd = 0x80000; /* 512 KiB */
! 60:
! 61: /* Clear ST-RAM */
! 62: STMemory_Clear(0x00000000, STRamEnd);
! 63:
! 64: /* Mirror ROM boot vectors */
! 65: STMemory_WriteLong(0x00, STMemory_ReadLong(TosAddress));
! 66: STMemory_WriteLong(0x04, STMemory_ReadLong(TosAddress+4));
! 67:
! 68: /* Fill in magic numbers, so TOS does not try to reference MMU */
! 69: STMemory_WriteLong(0x420, 0x752019f3); /* memvalid - configuration is valid */
! 70: STMemory_WriteLong(0x43a, 0x237698aa); /* another magic # */
! 71: STMemory_WriteLong(0x51a, 0x5555aaaa); /* and another */
! 72:
! 73: /* Set memory size, adjust for extra VDI screens if needed */
! 74: if (bUseVDIRes)
! 75: {
! 76: /* This is enough for 1024x768x16colors (0x60000) */
! 77: STMemory_WriteLong(0x436, STRamEnd-0x60000); /* mem top - upper end of user memory (before 32k screen) */
! 78: STMemory_WriteLong(0x42e, STRamEnd-0x58000); /* phys top */
! 79: }
! 80: else
! 81: {
! 82: STMemory_WriteLong(0x436, STRamEnd-0x8000); /* mem top - upper end of user memory (before 32k screen) */
! 83: STMemory_WriteLong(0x42e, STRamEnd); /* phys top */
! 84: }
! 85:
! 86: /* Set memory controller byte according to different memory sizes */
! 87: /* Setting per bank: %00=128k %01=512k %10=2Mb %11=reserved. - e.g. %1010 means 4Mb */
! 88: if (ConfigureParams.Memory.nMemorySize <= 4)
! 89: nMemControllerByte = MemControllerTable[ConfigureParams.Memory.nMemorySize];
! 90: else
! 91: nMemControllerByte = 0x0f;
! 92: STMemory_WriteByte(0x424, nMemControllerByte);
! 93: IoMem_WriteByte(0xff8001, nMemControllerByte);
! 94:
! 95: /* Set TOS floppies */
! 96: STMemory_WriteWord(0x446, nBootDrive); /* Boot up on A(0) or C(2) */
! 97:
! 98: /* Create connected drives mask: */
! 99: ConnectedDriveMask = 0;
! 100: for (i = 0; i < nNumDrives; i++)
! 101: {
! 102: ConnectedDriveMask |= (1 << i);
! 103: }
! 104: /* Set connected drives system variable.
! 105: * NOTE: some TOS images overwrite this value, see 'OpCode_SysInit', too */
! 106: STMemory_WriteLong(0x4c2, ConnectedDriveMask);
! 107:
! 108: /* Initialize the memory banks: */
! 109: memory_uninit();
! 110: memory_init(STRamEnd, 0, TosAddress);
! 111: }
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