mirror of
https://github.com/Tolik-Trek/Estex-DSS.git
synced 2026-06-15 09:21:47 +03:00
138 lines
2.9 KiB
NASM
138 lines
2.9 KiB
NASM
;!TODO fat32
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;=======================================================================
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;BPB
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;LD (FatBuffer.FAT2_XX),HL
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;LD (FatBuffer.DIR_FRL),HL ; first sector DIR
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;BPB32
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;LD HL,(CORE_BUFFERS.BootSector+#2C) ;fat32 <20>¥à¢ë© ª« áâ¥à ª®à¥¢®£® ª â «®£ (®¡ëç® 2) 4 ¡ ©â
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;FAT Max Cluster
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;LD (FAT_Max_Cluster_L),HL
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;=======================================================================
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;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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; ª®áâ뫨
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MODULE SET_FAT32
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; ‚•Ž„: HL - ¬« ¤è¥¥ á«®¢® ®¬¥à ª« áâ¥à ¯®á«¥ ¨ªà¥¬¥â
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; ‚›•Ž„: HL - ª ª ¨ ¢å®¤
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; DE - áâ à襥 á«®¢® ®¬¥à ª« áâ¥à ¯®á«¥ ¨ªà¥¬¥â
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CHECK_INC_HIGH_CLUSTER:
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LD DE,(R_CLUST.FAT32)
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;
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LD A,H
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OR L
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RET NZ
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;
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INC DE
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; !FIXIT ¯à®¢¥àïâì ¯¥à¥¯®«¥¨¥?
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RET
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ENDMODULE
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;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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;¢å®¤: DE:HL - ®¬¥à ª« áâ¥à
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;¢ë室: HL - ¤à¥á 㦮© ï祩ª¨ ¢ áâà ¨æ¥ FATPAGE
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GET_FAT32_CELL:
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;[ ] fat32
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DI
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HALT
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LD A,H
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LD B,H
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;AND #0F
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AND FAT_CACHE.Size_Mask_16
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LD H,A
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LD A,B
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; A=A/16 ; A - BLOCK FAT (1 BLOCK = 8192 BYTES)
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DUP FAT_CACHE.Degree_16
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RRCA
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EDUP
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;AND #0F
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AND FAT_CACHE.Part_Mask_16
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;
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ADD HL,HL ; HL - FAT OFFSET (FROM CASH)
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LD BC,(FatCache.Block) ; BC - BLOCK FAT IN CASH
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CP C
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CALL NZ,READ_FAT_TABLE ; A != C - READ NEW BLOCK FAT
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LD DE,FATPAGE.cache ; ç «® ª¥è FAT-
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ADD HL,DE ; ï祩ªã FAT
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RET
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/*
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; <20>à®ç¨â âì ¢ ª¥è 16 ᥪâ®à®¢ FAT-
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; A - NEW FAT BLOCK
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READ_FAT32:
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PUSH HL
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PUSH AF
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LD A,(FatCache.Update)
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OR A
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CALL NZ,WRITE_FAT_TABLE.Start
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POP AF
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LD L,A
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XOR A
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LD H,A ;!FIXIT fat32
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LD (FatCache.Block),HL
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LD (FatCache.Update),A
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;FAT BLOCK ^ FAT_CACHE.Degree = SECTOR OF FAT
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DUP FAT_CACHE.Degree_16
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ADD HL,HL ;x2
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EDUP
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LD DE,(FatBuffer.FAT_FRM)
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ADD HL,DE
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EX DE,HL
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;
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LD XH,D
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LD XL,E
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;LD IX,0
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;ADD IX,DE ; ®¬¥à «®£. ᥪâ®à
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;
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LD HL,0 ; áâ. à §àï¤ ; HL:IX - SECTOR FAT FOR READING ;!TODO FAT32
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LD DE,FATPAGE.cache ; ªã¤ ; DE - FAT ADDRESS
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LD A,(FatBuffer.DRIVE) ; ®¬¥à ¤¨áª
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LD BC,FAT_CACHE.Sectors*256 + Dss.DRV.Read ;ॣ B * FAT_CACHE.Sector_Size = CASH SIZE
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RST ToDSS.DRV
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POP HL
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RET
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;¢å®¤: HL - ®¬¥à ª« áâ¥à
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;¢ë室: HL - ¤à¥á 㦮© ï祩ª¨ ¢ áâà ¨æ¥ FATPAGE
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GET_FAT32_CELL:
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LD A,H
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LD B,H
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;AND #0F
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AND FAT_CACHE.Size_Mask_16
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LD H,A
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LD A,B
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; A=A/16 ; A - BLOCK FAT (1 BLOCK = 8192 BYTES)
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DUP FAT_CACHE.Degree_16
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RRCA
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EDUP
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;AND #0F
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AND FAT_CACHE.Part_Mask_16
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;
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ADD HL,HL ; HL - FAT OFFSET (FROM CASH)
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LD BC,(FatCache.Block) ; C - BLOCK FAT IN CASH
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CP C
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CALL NZ,READ_FAT_TABLE ; A != C - READ NEW BLOCK FAT
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LD DE,FATPAGE.cache ; ç «® ª¥è FAT-
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ADD HL,DE ; ï祩ªã FAT
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RET
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R_F_F16:
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CALL GET_FAT16_CELL
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LD E,(HL) ; ¯à®ç¨â âì ®¬¥à ª« áâ¥à
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INC HL
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LD D,(HL)
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POP AF
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OUT (SLOT3),A
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;!TODO #FFF7 - ª« áâ¥à á ª®áïªç묨 ᥪâ®à ¬¨
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LD HL,#FFEF ;!HARDCODE
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XOR A ; DssErr.sys.NO_ERROR
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SBC HL,DE ; ¯à®¢¥àª á«ã¦. ª« áâ¥àë
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POP HL
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RET
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*/
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; |