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Implement alpha_amask(), a stub which reads the "architecture feature mask"

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using the "amask" instruction.
This commit is contained in:
thorpej 1997-09-16 06:54:01 +00:00
parent 4fe999c6bf
commit 9faf00ea6a
1 changed files with 17 additions and 2 deletions
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19
sys/arch/alpha/alpha/pal.s
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@ -1,4 +1,4 @@
/* $NetBSD: pal.s,v 1.8 1997/09/03 23:09:04 thorpej Exp $ */
/* $NetBSD: pal.s,v 1.9 1997/09/16 06:54:01 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
@ -39,7 +39,7 @@
* and Richard T. Witek.
*/
__KERNEL_RCSID(1, "$NetBSD: pal.s,v 1.8 1997/09/03 23:09:04 thorpej Exp $");
__KERNEL_RCSID(1, "$NetBSD: pal.s,v 1.9 1997/09/16 06:54:01 thorpej Exp $");
/*
* alpha_rpcc: read process cycle counter (XXX INSTRUCTION, NOT PALcode OP)
@ -69,6 +69,21 @@ LEAF(alpha_wmb,0)
RET
END(alpha_wmb)
/*
* alpha_amask: read architecture features (XXX INSTRUCTION, NOT PALcode OP)
*
* Arguments:
* a0 bitmask of features to test
*
* Returns:
* v0 bitmask - bit is _cleared_ if feature is supported
*/
.text
LEAF(alpha_amask,1)
amask a0, v0
RET
END(alpha_amask)
/*
* alpha_pal_imb: I-Stream memory barrier. [UNPRIVILEGED]
* (Makes instruction stream coherent with data stream.)