| 5,7 → 5,83 |
|---|
| ;; Addings by M.Lisovin ;; |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
| |
| ; calculate fat chain |
| |
| calculatefatchain: |
| |
| pushad |
| |
| mov esi,0x100000+512 |
| mov edi,0x280000 |
| |
| fcnew: |
| mov eax,dword [esi] |
| mov ebx,dword [esi+4] |
| mov ecx,dword [esi+8] |
| mov edx,ecx |
| shr edx,4 ;8 ok |
| shr dx,4 ;7 ok |
| xor ch,ch |
| shld ecx,ebx,20 ;6 ok |
| shr cx,4 ;5 ok |
| shld ebx,eax,12 |
| and ebx,0x0fffffff ;4 ok |
| shr bx,4 ;3 ok |
| shl eax,4 |
| and eax,0x0fffffff ;2 ok |
| shr ax,4 ;1 ok |
| mov dword [edi],eax |
| add edi,4 |
| mov dword [edi],ebx |
| add edi,4 |
| mov dword [edi],ecx |
| add edi,4 |
| mov dword [edi],edx |
| add edi,4 |
| add esi,12 |
| |
| cmp edi,0x280000+2856*2 ;2849 clusters |
| jnz fcnew |
| |
| popad |
| ret |
| |
| |
| restorefatchain: ; restore fat chain |
| |
| pushad |
| |
| mov esi,0x280000 |
| mov edi,0x100000+512 |
| |
| fcnew2: |
| mov eax,dword [esi] |
| mov ebx,dword [esi+4] |
| shl ax,4 |
| shl eax,4 |
| shl bx,4 |
| shr ebx,4 |
| shrd eax,ebx,8 |
| shr ebx,8 |
| mov dword [edi],eax |
| add edi,4 |
| mov word [edi],bx |
| add edi,2 |
| add esi,8 |
| |
| cmp edi,0x100000+512+4278 ;4274 bytes - all used FAT |
| jb fcnew2 |
| |
| mov esi,0x100000+512 ; duplicate fat chain |
| mov edi,0x100000+512+0x1200 |
| mov ecx,1069 ;4274/4 |
| cld |
| rep movsd |
| |
| popad |
| ret |
| |
| |
| ramdisk_free_space: |
| ;--------------------------------------------- |
| ; |
| 18,7 → 94,7 |
|---|
| mov edi,0x280000 ;start of FAT |
| xor ax,ax ;Free cluster=0x0000 in FAT |
| xor ebx,ebx ;counter |
| mov ecx,2847 ;2849 ;2849 clusters |
| mov ecx,2849 ;2849 clusters |
| cld |
| rdfs1: |
| repne scasw |
| 122,7 → 198,7 |
|---|
| push edx |
| mov edx,ecx |
| add edx,ebx |
| cmp edx,14 ;ebx+ecx=14 |
| cmp edx,15 ;ebx+ecx=14+1 |
| pushf |
| jbe fr_do1 |
| sub edx,14 |
| 136,7 → 212,7 |
|---|
| rep movsd |
| popf |
| pop edx |
| ; jae fr_do2 |
| jae fr_do2 |
| xor eax,eax ; ok read |
| xor ebx,ebx |
| ret |