wok annotate syslinux/stuff/iso2exe/ifmem.S @ rev 25033
giblib: modified configure parameter
| author | Hans-G?nter Theisgen |
|---|---|
| date | Fri May 20 10:31:53 2022 +0100 (2022-05-20) |
| parents | |
| children |
| rev | line source |
|---|---|
| pascal@18151 | 1 .code16 |
| pascal@18151 | 2 .org 0 |
| pascal@18151 | 3 type_of_loader = 0x10 |
| pascal@18151 | 4 |
| pascal@18151 | 5 orw $0x8020, type_of_loader(%si) # loader type = 0x20 = bootsect-loader |
| pascal@18151 | 6 pushal |
| pascal@18151 | 7 |
| pascal@18151 | 8 movw $10+16, %cx |
| pascal@18151 | 9 fillbuf: |
| pascal@18151 | 10 pushw $0 |
| pascal@18151 | 11 loop fillbuf |
| pascal@18151 | 12 popal // clear regiters |
| pascal@18151 | 13 maploop: |
| pascal@18151 | 14 movw %sp, %di // %es = %ss |
| pascal@18151 | 15 movb $20, %cl |
| pascal@18151 | 16 movw $0xE820, %ax |
| pascal@18151 | 17 movl $0x534d4150, %edx |
| pascal@18151 | 18 int $0x15 |
| pascal@18151 | 19 sbbl %eax, %edx |
| pascal@18151 | 20 jne mapdone |
| pascal@18151 | 21 decw 16(%di) |
| pascal@18151 | 22 jne notram |
| pascal@18151 | 23 addw 8+2(%di), %bp |
| pascal@18151 | 24 notram: |
| pascal@18151 | 25 orw %bx, %bx |
| pascal@18151 | 26 jnz maploop |
| pascal@18151 | 27 mapdone: |
| pascal@18151 | 28 addw $20, %sp |
| pascal@18151 | 29 shrw $20-16,%bp |
| pascal@18151 | 30 jnz mapdone2 |
| pascal@18151 | 31 movb $0x88, %ah |
| pascal@18151 | 32 int $0x15 |
| pascal@18151 | 33 xchgw %ax, %bp |
| pascal@18151 | 34 shrw $10, %bp |
| pascal@18151 | 35 mapdone2: |
| pascal@18151 | 36 incw %bp |
| pascal@18151 | 37 // %bp : nb Mb |
| pascal@18151 | 38 call here |
| pascal@18151 | 39 here: |
| pascal@18151 | 40 popw %di |
| pascal@18151 | 41 movw $0x1EE, %si |
| pascal@18151 | 42 lodsw |
| pascal@18151 | 43 sizeloop: |
| pascal@18151 | 44 scasw // %di += 2 |
| pascal@18151 | 45 addw $4, %ax |
| pascal@18151 | 46 cmpb %al, (%si) |
| pascal@18151 | 47 jbe sizedone |
| pascal@18151 | 48 cmpw %bp, sizes-here(%di) |
| pascal@18151 | 49 jbe sizeloop |
| pascal@18151 | 50 movb %al, (%si) |
| pascal@18151 | 51 sizedone: |
| pascal@18151 | 52 popal |
| pascal@18151 | 53 lret // need %si |
| pascal@18151 | 54 sizes: |
| pascal@18151 | 55 |