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Add duplicate code to read the FPU ID. 

enable & disable the FPU around it.
This commit is contained in:
maya 2018-03-07 15:56:33 +00:00
parent 2e66644133
commit e1e5fba20d
1 changed files with 20 additions and 2 deletions
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22
sys/arch/mips/mips/locore.S
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@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.213 2018/03/07 15:52:43 maya Exp $ */
/* $NetBSD: locore.S,v 1.214 2018/03/07 15:56:33 maya Exp $ */
/*
* Copyright (c) 1992, 1993
@ -63,7 +63,7 @@
#include <mips/trap.h>
#include <mips/locore.h>
RCSID("$NetBSD: locore.S,v 1.213 2018/03/07 15:52:43 maya Exp $")
RCSID("$NetBSD: locore.S,v 1.214 2018/03/07 15:56:33 maya Exp $")
#include "assym.h"
@ -167,6 +167,24 @@ _C_LABEL(kernel_text):
mfc0 t0, MIPS_COP_0_PRID # read product revision ID
COP0_SYNC
nop
#ifdef NOFPU
li t1, 0 # Dummy FPU_ID
#else
/* Enable the FPU to read FPUID */
mfc0 k0, MIPS_COP_0_STATUS
MFC0_HAZARD
or k0, MIPS_SR_COP_1_BIT
mtc0 k0, MIPS_COP_0_STATUS
COP0_HAZARD_FPUENABLE
cfc1 t1, MIPS_FPU_ID
/* Disable again, we don't want it on in the kernel */
and k0, ~MIPS_SR_COP_1_BIT
mtc0 k0, MIPS_COP_0_STATUS
#endif
#ifdef NOFPU /* No FPU; avoid touching FPU registers */
add t1, zero, zero
#else