FreeCalypso > hg > freecalypso-tools

annotate target-utils/libbase/osmodelay.S @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000
parents e7502631a0f9
children
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1 /*
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2 * This assembly module provides a replica of OsmocomBB's bogo-millisecond
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3 * delay_ms() function. It is literally a copy of what OsmocomBB's delay_ms()
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4 * compiles to with their gcc version and their optimization settings, as seen
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5 * by doing arm-elf-objdump on their lib/delay.o.
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6 *
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7 * This hack is intended for those cases where we have to copy OsmocomBB's
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8 * black magic voodoo operations with no ability to understand what is actually
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9 * needed, such as SPCA552E initialization on the Pirelli DP-L10.
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10 */
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12 .text
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13 .code 32
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14 .globl osmo_delay_ms
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15 osmo_delay_ms:
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16 mov r3, #0
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17 sub sp, sp, #4
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18 str r3, [sp]
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19 ldr r3, =1300
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20 mul r3, r0, r3
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21 b 2f
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22 1: ldr r2, [sp]
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23 ldr r2, [sp]
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24 add r2, r2, #1
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25 str r2, [sp]
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26 2: ldr r2, [sp]
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27 cmp r2, r3
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28 bcc 1b
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29 add sp, sp, #4
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30 bx lr