FreeCalypso > hg > freecalypso-citrine

annotate libiram/bcopy_chunk32.S @ 26:51e1a3b213a3

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started re-adding documentation
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Jun 2016 07:01:34 +0000
parents 75a11d740a02
children
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75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * bcopy_32byte_chunks() takes the same arguments as BSD bcopy(),
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3 * but works on large chunks, specifically:
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4 *
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Mychaela Falconia <falcon@freecalypso.org>
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5 * - both addresses must be 32-bit word-aligned;
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6 * - the count must be a non-zero multiple of 32 bytes;
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7 * - the source and destination memory regions must not overlap.
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8 *
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9 * Arguments:
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10 *
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11 * R0: source address (word-aligned)
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12 * R1: destination address (ditto)
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13 * R2: byte count (must be a multiple of 32)
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14 */
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15
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16 .text
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17 .code 32
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18
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19 .globl bcopy_32byte_chunks
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20 bcopy_32byte_chunks:
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21 stmfd sp!, {r4-r9}
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22 1: ldmia r0!, {r3-r9,r12}
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23 stmia r1!, {r3-r9,r12}
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24 subs r2, r2, #0x20
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25 bhi 1b
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26 ldmfd sp!, {r4-r9}
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27 bx lr