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22 lines
432 B
ArmAsm
22 lines
432 B
ArmAsm
.cpu arm7tdmi
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.section "offsettosectorremap", "ax"
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.syntax unified
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.thumb
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// r0 = rom offset
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// returns sd sector in r0
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// returns remaining sectors in cluster in lr
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.global offset_to_sector_remap
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.type offset_to_sector_remap, %function
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offset_to_sector_remap:
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push {lr}
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lsrs r0, r0, #9 // byte address to sector address
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movs r1, #1
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mov lr, r1 // read at most 1 sector at a time
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pop {pc}
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.balign 4
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.pool
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.end |