/*
* Copyright (c) 1996-2002 Eduardo Horvath
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*notice, this list of conditions and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* The following routines allow fpu use in the kernel.
*
* They allocate a stack frame and use all local regs. Extra
* local storage can be requested by setting the siz parameter,
* and can be accessed at %sp+CC64FSZ.
*/
#define ENABLE_FPU(siz) \
save %sp, -(CC64FSZ), %sp; /* Allocate a stack frame */ \
sethi %hi(FPLWP), %l1; \
add %fp, STKB-FS_SIZE, %l0; /* Allocate a fpstate */\
LDPTR [%l1 + %lo(FPLWP)], %l2; /* Load fplwp */ \
andn %l0, BLOCK_ALIGN, %l0; /* Align it */ \
clr %l3; /* NULL fpstate */ \
brz,pt %l2, 1f; /* fplwp == NULL? */ \
add %l0, -STKB-CC64FSZ-(siz), %sp; /* Set proper %sp */ \
LDPTR [%l2 + L_FPSTATE], %l3; \
brz,pn %l3, 1f; /* Make sure we have an fpstate */ \
mov %l3, %o0; \
call _C_LABEL(savefpstate); /* Save the old fpstate */ \
1: \
set EINTSTACK-STKB, %l4; /* Are we on intr stack? */ \
cmp %sp, %l4; \
bgu,pt %xcc, 1f; \
set INTSTACK-STKB, %l4; \
cmp %sp, %l4; \
blu %xcc, 1f; \
0: \
sethi %hi(_C_LABEL(lwp0)), %l4; /* Yes, use lpw0 */ \
ba,pt %xcc, 2f; /* XXXX needs to change to CPUs idle proc */ \
or %l4, %lo(_C_LABEL(lwp0)), %l5; \
1: \
sethi %hi(CURLWP), %l4; /* Use curlwp */ \
LDPTR [%l4 + %lo(CURLWP)], %l5; \
brz,pn %l5, 0b; nop; /* If curlwp is NULL need to use lwp0 */\
2: \
LDPTR [%l5 + L_FPSTATE], %l6; /* Save old fpstate */ \
STPTR %l0, [%l5 + L_FPSTATE]; /* Insert new fpstate */\
STPTR %l5, [%l1 + %lo(FPLWP)]; /* Set new fplwp */ \
wr %g0, FPRS_FEF, %fprs /* Enable FPU */
/*
* Weve saved our possible fpstate, now disable the fpu
* and continue with life.
*/
#ifdef DEBUG
#define __CHECK_FPU \
LDPTR [%l5 + L_FPSTATE], %l7; \
cmp %l7, %l0; \
tnz 1;
#else
#define __CHECK_FPU
#endif
