| 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/elfmacro.h> |
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| 27 | #include <asm-leon/leon.h> |
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| 28 | #include <asm-leon/leonstack.h> |
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| 29 | #include <asm-leon/contextswitch.h> |
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| 30 | #include <asm-leon/winmacros.h> |
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| 31 | #include <asm-leon/leonbare_kernel.h> |
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| 32 | |
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| 33 | FUNC_EXPORT(_leonbare_kernel_switchto) |
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| 34 | FUNC_EXPORT(_leonbare_Stop) |
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| 35 | |
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| 36 | FUNC_IMPORT(leonbare_disable_traps) |
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| 37 | |
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| 38 | .text |
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| 39 | |
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| 40 | /* unsigned int _leonbare_kernel_switchto(struct leonbare_thread_ctx *thread,struct leonbare_thread_ctx *thread) */ |
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| 41 | FUNC_BEGIN(_leonbare_kernel_switchto) |
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| 42 | |
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| 43 | /* =================================*/ |
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| 44 | /* save context */ |
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| 45 | /* =================================*/ |
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| 46 | |
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| 47 | mov %o0, %g1 |
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| 48 | mov %o1, %g2 |
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| 49 | mov %o7, %g3 |
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| 50 | rd %psr, %g4 /* psr.cwp should stay same because irq path rely on it. */ |
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| 51 | |
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| 52 | call leonbare_disable_traps /* psr in %o0, modify %o0, %o1, %o7 */ |
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| 53 | nop |
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| 54 | |
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| 55 | set TACODE_IRQCALL_FLUSH,%o1 |
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| 56 | ta TACODE_IRQCALL |
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| 57 | |
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| 58 | st %g4, [%g1 + LEONBARE_THREAD_CTX_STACK_PSR] /* psr */ |
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| 59 | set LEONBARE_THREAD_CTX_MAGIC,%g4 |
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| 60 | st %g4, [%g1 + LEONBARE_THREAD_CTX_STACK_MAGIC] |
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| 61 | |
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| 62 | mov %g3, %o7 ! restore %o7 |
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| 63 | |
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| 64 | LEONBARE_THREAD_CTX_STORE_INS(g1) |
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| 65 | LEONBARE_THREAD_CTX_STORE_LOCALS(g1) |
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| 66 | LEONBARE_THREAD_CTX_STORE_OUTS(g1) |
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| 67 | |
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| 68 | /* =================================*/ |
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| 69 | /* restore context */ |
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| 70 | /* =================================*/ |
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| 71 | |
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| 72 | /* check valid context stack area */ |
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| 73 | ld [%g2 + LEONBARE_THREAD_CTX_STACK_MAGIC], %o1 |
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| 74 | set LEONBARE_THREAD_CTX_MAGIC,%o2 |
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| 75 | cmp %o1, %o2 |
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| 76 | beq 1f |
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| 77 | nop |
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| 78 | |
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| 79 | /* stop all */ |
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| 80 | ta 0x0 |
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| 81 | |
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| 82 | 1: |
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| 83 | /* get psr */ |
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| 84 | ld [%g2 + LEONBARE_THREAD_CTX_STACK_PSR],%g1 /* psr.cwp should stay same because irq path rely on it. */ |
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| 85 | set SPARC_PSR_EF_MASK,%g3 ! clear ef bit |
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| 86 | andn %g1, %g3, %g1 |
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| 87 | |
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| 88 | wr %g0,%wim |
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| 89 | nop; nop; nop; |
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| 90 | |
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| 91 | andn %g1, SPARC_PSR_ET_MASK, %g3 ! disable traps, up to PSR_EF imm andn ok |
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| 92 | wr %g3, %psr |
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| 93 | nop; nop; nop; |
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| 94 | |
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| 95 | LEONBARE_THREAD_CTX_LOAD_INS(g2) |
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| 96 | LEONBARE_THREAD_CTX_LOAD_LOCALS(g2) |
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| 97 | LEONBARE_THREAD_CTX_LOAD_OUTS(g2) |
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| 98 | |
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| 99 | SET_WIM_CWPMIN1(g1,o1,o2,o3,o4) ! calc wim from psr_cwp so that next restore traps |
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| 100 | |
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| 101 | wr %g1,%psr |
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| 102 | nop; nop; nop; |
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| 103 | |
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| 104 | retl |
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| 105 | nop |
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| 106 | |
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| 107 | FUNC_END(_leonbare_kernel_switchto) |
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| 108 | |
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| 109 | |
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| 110 | FUNC_BEGIN(_leonbare_Stop) |
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| 111 | ta 0x0 |
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| 112 | FUNC_END(_leonbare_Stop) |
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