112 lines
2.9 KiB
ArmAsm
112 lines
2.9 KiB
ArmAsm
/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <asm-leon/asmmacro.h>
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#include <asm-leon/leonstack.h>
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#include <asm-leon/winmacros.h>
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#include <asm-leon/leon.h>
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#ifndef _SOFT_FLOAT
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.seg "text"
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/* ------- */
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.weak _fpdis_enable_svt
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.set _fpdis_enable_svt,__fpdis_enable_svt
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.weak _fpdis_enable
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.set _fpdis_enable,__fpdis_enable
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/* ------- */
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!.global _fpdis_enable,_fpdis_enable_svt
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__fpdis_enable_svt:
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__fpdis_enable:
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set SPARC_PSR_EF_MASK,%l3
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or %l0,%l3,%l0
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or %l0,0xf00, %l3 ! PIL up to 15, enable fpu
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wr %l3,0, %psr ! restore the condition flags, enable fpu
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nop
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nop
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nop
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mov %psr, %l3 ! check if fpu is present
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set SPARC_PSR_EF_MASK,%l4
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andcc %l3, %l4, %l3
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bne 4f
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nop
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ta 0 ! no fpu present, halt
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4:
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set fpustate_current,%l4
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ld [%l4],%l4
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set fpustate_owner,%l5
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ld [%l5],%l5
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cmp %l4,%l5
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beq mpfnostore
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nop
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cmp %g0,%l5
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beq mpfstore
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nop
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FW_STORE(%l5)
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mpfstore:
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set fpustate_owner,%l6
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st %l4,[%l6]
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cmp %g0,%l4
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beq mpfnostore
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nop
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FW_LOAD(%l4)
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mpfnostore:
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wr %l0,0, %psr ! restore the condition flags, enable fpu
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nop
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nop
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nop
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jmpl %l1, %g0
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rett %l2
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.seg "data"
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.global fpustate_default
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.align 8
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fpustate_default:
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.long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0;
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.long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0;
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.long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0;
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.long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0;
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.long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0;
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.global fpustate_owner
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fpustate_owner:
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.word fpustate_default ! pointer to FPU owning context
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.global fpustate_current
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fpustate_current:
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.word fpustate_default ! pointer to current threads FPU context
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#endif
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