forked from Lephenixnoir/gint
63 lines
1.2 KiB
ArmAsm
63 lines
1.2 KiB
ArmAsm
/*
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** gint:rtc:inth - Interrupt handler for the Real-Time Clock
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** This one is fairly simple, just a flag to clear and potentially a timer to
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** stop if the callback returns non-zero.
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*/
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.global _inth_rtc_pri
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.global _inth_rtc_pri_helper
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.section .gint.blocks, "ax"
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.align 4
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/* RTC PERIODIC INTERRUPT HANDLER - 56 BYTES */
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_inth_rtc_pri:
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/* Invoke the callback function with its argument */
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sts.l pr, @-r15
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mov.l .gint_inth_callback, r0
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mov.l @r0, r0
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mov.l 1f, r4
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mov.l 2f, r5
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jsr @r0
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nop
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/* Jump to another gate to finish the work:
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- 0xc is the size of storage below
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- 0x20 is the size of the gap before next gate (alarm interrupt) */
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mov #0x2c, r2
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braf r2
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nop
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1: .long 0 /* Callback function: edited dynamically */
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2: .long 0 /* Argument to callback function */
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.gint_inth_callback:
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.long _gint_inth_callback
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_inth_rtc_pri_helper:
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/* Save the return value */
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mov r0, r3
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.clear:
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/* Clear the interrupt flag */
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mov.l .RCR2, r1
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mov.b @r1, r0
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tst #0x80, r0
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and #0x7f, r0
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bf.s .clear
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mov.b r0, @r1
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/* Stop the timer if the return value of the callback was non-zero */
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tst r3, r3
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bt .end
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and #0x8f, r0
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mov.b r0, @r1
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.end:
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lds.l @r15+, pr
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rts
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nop
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.RCR2: .long 0xa413fede /* RCR2 address, edited at startup on SH3 */
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