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annotate gsm-fw/libiram/bcopy_words.S @ 992:a7b0b426f9ca

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target-utils: boot ROM UART autodetection revamped The new implementation should work with both the familiar Calypso C035 boot ROM version found in our regular targets as well as the older Calypso F741979B version found on the vintage D-Sample board.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 21:28:41 +0000
parents cbc49d533b7d
children
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cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
Space Falcon <falcon@ivan.Harhan.ORG>
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1 /*
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2 * bcopy_aligned_words() takes the same arguments as BSD bcopy(),
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3 * but requires both addresses and the count to be 32-bit word-aligned,
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4 * and assumes that the source and destination memory regions
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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5 * do not overlap. Furthermore, the count is expected to be non-zero.
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6 *
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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7 * Arguments:
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8 *
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9 * R0: source address (word-aligned)
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10 * R1: destination address (ditto)
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11 * R2: byte count (must be a multiple of 4)
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12 */
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13
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14 .text
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15 .code 32
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16
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17 .globl bcopy_aligned_words
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18 bcopy_aligned_words:
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19 1: ldr r3, [r0], #4
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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20 str r3, [r1], #4
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21 subs r2, r2, #4
cbc49d533b7d gsm-fw: new implementation of bzero() and some specialized bcopy variants
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22 bhi 1b
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23 bx lr