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34 lines
904 B
ArmAsm
34 lines
904 B
ArmAsm
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#include "asm/asmdefs.h"
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#include "asm/processor.h"
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/*
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* unsigned long long _get_ticks(void);
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*/
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GLOBL(_get_ticks):
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1: mftbu r3
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mftb r4
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mftbu r5
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cmpw 0,r3,r5
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bne 1b
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blr
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/*
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* Delay for a number of ticks
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*/
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GLOBL(_wait_ticks):
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mflr r8 /* save link register */
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mr r7, r3 /* save tick count */
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bl _get_ticks /* Get start time */
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/* Calculate end time */
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addc r7, r4, r7 /* Compute end time lower */
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addze r6, r3 /* and end time upper */
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1: bl _get_ticks /* Get current time */
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subfc r4, r4, r7 /* Subtract current time from end time */
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subfe. r3, r3, r6
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bge 1b /* Loop until time expired */
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mtlr r8 /* restore link register */
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blr
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