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diff src/cs/system/main/gcc/irq_twiddle.S @ 0:4e78acac3d88

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src/{condat,cs,gpf,nucleus}: import from Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Oct 2020 06:23:26 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/system/main/gcc/irq_twiddle.S	Fri Oct 16 06:23:26 2020 +0000
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+/*
+ * TI's L1 code (and possibly other parts of the software suite) calls
+ * functions named INT_DisableIRQ() and INT_EnableIRQ(); in TI's original
+ * fw they are implemented (in a very ugly manner, as usual) in the
+ * int.s entry point assembly module.  Here we implement the same
+ * functions in a cleaner way.
+ */
+
+#include "asm_defs.h"
+
+	.code 32
+	.text
+
+	.globl	INT_DisableIRQ
+INT_DisableIRQ:
+	mrs	r0, CPSR
+	orr	r0, r0, #LOCKOUT
+	msr	CPSR, r0
+	bx	lr
+
+	.globl	INT_EnableIRQ
+INT_EnableIRQ:
+	mrs	r0, CPSR
+	bic	r0, r0, #LOCKOUT
+	msr	CPSR, r0
+	bx	lr