progress on FAT16 support

2024-01-12 13:29:20 +01:00
parent ee2f22df09
commit 507eb3a017
40 changed files with 19699 additions and 6346 deletions
--- a/OperatingSystem/software/test_old.asm
+++ b/OperatingSystem/software/test_old.asm
@@ -0,0 +1,141 @@
+.include "extern_symbols.s" ;include monitor symbols.
+    org 0xB000  
+;Testing code
+
+    ;LD HL,MEM_IDE_BUFFER 
+    ;LD B,32
+    ;call dump_pretty
+    call find_partition
+    ;call fat_get_root_table
+    ;call fat_print_directory
+
+    call fat_get_root_table
+    LD DE, [str1]
+    CALL fat_lfs
+    
+    JP PROMPT_BEGIN
+
+str1:
+    db "ILLUSION.PSG",0
+str2:
+    db "HALLOWLT.TXT",0
+str3:
+    db "TEST",0
+str4:
+    db ".ORG",0
+
+delay_small:
+    PUSH AF
+    POP AF
+    PUSH AF
+    POP AF
+    RET
+
+find_partition:
+    ;read bootsector
+    LD A,1                  ;read 1 sector
+    LD B,IDE_REG_SECTOR
+    CALL ide_regwrite_8
+
+    LD A,1                  ;read sector 0
+    LD B,IDE_REG_SSECTOR
+    CALL ide_regwrite_8
+
+    LD A,0                  ;read cylinder 0
+    LD B,IDE_REG_LCYL
+    CALL ide_regwrite_8
+    LD A,0                  
+    LD B,IDE_REG_HCYL
+    CALL ide_regwrite_8
+
+    LD A,10100000b          ;read head 0
+    LD B,IDE_REG_HEAD
+    CALL ide_regwrite_8
+
+    LD A,IDE_CMD_READSEC    ;send read command
+    LD B,IDE_REG_CMDSTS
+    CALL ide_regwrite_8
+
+    LD HL,MEM_IDE_BUFFER    ;set read/write buffer start address
+    call ide_readsector_512_inv ;read 256 words from device
+
+    LD B,4                      ;Partition table length
+    LD C,0                      ;Partition ID counter
+    LD IX,MEM_IDE_BUFFER+446    ;Load offest of first partition table entry
+find_partition_loop:
+    LD A,(IX+4) ;load status byte
+    OR A
+    JP NZ, find_partition_process    ;If not zero, jump to print function
+    jp find_partition_next
+
+find_partition_next:
+    LD A,10                 ;New line
+    CALL print_char
+    LD A,13
+    CALL print_char
+    LD DE,16
+    ADD IX,DE
+    DJNZ find_partition_loop    
+    RET
+
+find_partition_process: ; process table entry
+    ld hl, [str_part_seek_1]
+    call print_str  ;print 
+    LD A,(IX+0x04) ;load type
+    call print_a_hex
+    LD A,(IX+0x04) ;load type
+    CP 0x0E
+    JR NZ, find_partition_next
+
+    ld hl, [str_part_seek_2]
+    call print_str  ;print 
+    ld hl, [str_part_seek_3]
+    call print_str  ;print 
+
+    LD A,(IX+0x08) ;load start LBA
+    LD (MEM_IDE_PARTITION+3),A
+    LD A,(IX+0x09) ;load start LBA
+    LD (MEM_IDE_PARTITION+2),A
+    LD A,(IX+0x0A) ;load start LBA
+    LD (MEM_IDE_PARTITION+1),A
+    LD A,(IX+0x0B) ;load start LBA
+    LD (MEM_IDE_PARTITION+0),A
+
+    LD A,(MEM_IDE_PARTITION+3)
+    call print_a_hex
+    LD A,(MEM_IDE_PARTITION+2)
+    call print_a_hex
+    LD A,(MEM_IDE_PARTITION+1)
+    call print_a_hex
+    LD A,(MEM_IDE_PARTITION+0)
+    call print_a_hex
+    ld hl, [str_part_seek_4]
+    call print_str  ;print 
+    LD A,(IX+0x0C) ;load count LBA
+    call print_a_hex
+    LD A,(IX+0x0D) ;load count LBA
+    call print_a_hex
+    LD A,(IX+0x0E) ;load count LBA
+    call print_a_hex
+    LD A,(IX+0x0F) ;load count LBA
+    call print_a_hex
+    LD A,10                 ;New line
+    CALL print_char
+    LD A,13
+    CALL print_char
+    RET
+
+str_part_seek_1:
+    db "- Type: 0x",0
+str_part_seek_2:
+    db " State: ",0
+str_part_seek_3:
+    db " LBA: 0x",0
+str_part_seek_4:
+    db " Len: 0x",0
+str_sum:
+    db "------------",10,13,0
+str_files:
+    db " Files",10,13,0
+
+.include "include/fat16.s"