[444] | 1 | /* |
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| 2 | * Copyright (c) 2011 Aeroflex Gaisler |
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| 3 | * |
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| 4 | * BSD license: |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 7 | * of this software and associated documentation files (the "Software"), to deal |
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| 8 | * in the Software without restriction, including without limitation the rights |
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 10 | * copies of the Software, and to permit persons to whom the Software is |
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| 11 | * furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included in |
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| 14 | * all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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| 22 | * THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | |
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| 26 | #include <asm-leon/asmmacro.h> |
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| 27 | #include <asm-leon/leonstack.h> |
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| 28 | #include <asm-leon/winmacros.h> |
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| 29 | #include <asm-leon/leon.h> |
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| 30 | |
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| 31 | #ifndef _SOFT_FLOAT |
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| 32 | |
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| 33 | .seg "text" |
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| 34 | /* ------- */ |
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| 35 | .weak _fpdis_enable_svt |
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| 36 | .set _fpdis_enable_svt,__fpdis_enable_svt |
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| 37 | .weak _fpdis_enable |
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| 38 | .set _fpdis_enable,__fpdis_enable |
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| 39 | /* ------- */ |
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| 40 | !.global _fpdis_enable,_fpdis_enable_svt |
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| 41 | __fpdis_enable_svt: |
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| 42 | __fpdis_enable: |
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| 43 | |
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| 44 | set SPARC_PSR_EF_MASK,%l3 |
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| 45 | or %l0,%l3,%l0 |
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| 46 | or %l0,0xf00, %l3 ! PIL up to 15, enable fpu |
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| 47 | wr %l3,0, %psr ! restore the condition flags, enable fpu |
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| 48 | nop |
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| 49 | nop |
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| 50 | nop |
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| 51 | |
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| 52 | mov %psr, %l3 ! check if fpu is present |
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| 53 | set SPARC_PSR_EF_MASK,%l4 |
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| 54 | andcc %l3, %l4, %l3 |
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| 55 | bne 4f |
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| 56 | nop |
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| 57 | |
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| 58 | ta 0 ! no fpu present, halt |
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| 59 | |
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| 60 | 4: |
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| 61 | set fpustate_current,%l4 |
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| 62 | |
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| 63 | ld [%l4],%l4 |
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| 64 | set fpustate_owner,%l5 |
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| 65 | ld [%l5],%l5 |
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| 66 | cmp %l4,%l5 |
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| 67 | beq mpfnostore |
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| 68 | nop |
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| 69 | cmp %g0,%l5 |
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| 70 | beq mpfstore |
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| 71 | nop |
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| 72 | |
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| 73 | FW_STORE(%l5) |
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| 74 | |
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| 75 | mpfstore: |
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| 76 | set fpustate_owner,%l6 |
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| 77 | st %l4,[%l6] |
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| 78 | cmp %g0,%l4 |
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| 79 | beq mpfnostore |
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| 80 | nop |
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| 81 | |
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| 82 | FW_LOAD(%l4) |
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| 83 | |
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| 84 | mpfnostore: |
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| 85 | wr %l0,0, %psr ! restore the condition flags, enable fpu |
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| 86 | nop |
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| 87 | nop |
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| 88 | nop |
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| 89 | |
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| 90 | jmpl %l1, %g0 |
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| 91 | rett %l2 |
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| 92 | |
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| 93 | .seg "data" |
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| 94 | |
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| 95 | .global fpustate_default |
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| 96 | .align 8 |
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| 97 | fpustate_default: |
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| 98 | .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; |
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| 99 | .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; |
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| 100 | .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; |
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| 101 | .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; |
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| 102 | .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; .long 0; |
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| 103 | .global fpustate_owner |
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| 104 | fpustate_owner: |
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| 105 | .word fpustate_default ! pointer to FPU owning context |
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| 106 | |
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| 107 | .global fpustate_current |
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| 108 | fpustate_current: |
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| 109 | .word fpustate_default ! pointer to current threads FPU context |
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| 110 | |
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| 111 | #endif |
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