| 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/leonstack.h> |
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| 27 | #include <asm-leon/asmmacro.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 | /* l0: psr |
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| 32 | l1: pc |
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| 33 | l2: npc |
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| 34 | l3: wim |
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| 35 | l7: irqnr */ |
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| 36 | |
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| 37 | .seg "text" |
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| 38 | |
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| 39 | /* ------- */ |
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| 40 | .weak _leonbare_irq_entry_svt |
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| 41 | .set _leonbare_irq_entry_svt,__leonbare_irq_entry_svt |
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| 42 | .weak leonbare_irq_entry |
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| 43 | .set leonbare_irq_entry,_leonbare_irq_entry |
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| 44 | /* ------- */ |
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| 45 | !.global leonbare_irq_entry,_leonbare_irq_entry_svt |
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| 46 | .global _irqtbl, _irqtrap, handler_irq, fpustate_current |
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| 47 | |
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| 48 | #define FASTIRQ_ENABLE |
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| 49 | /*#define FASTIRQ_DYNAMIC*/ /* depend on FASTIRQ_ENABLE */ |
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| 50 | |
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| 51 | __leonbare_irq_entry_svt: /* irq from svt trap dispatcher */ |
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| 52 | sub %l6,0x10, %l7 |
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| 53 | rd %wim, %l3 |
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| 54 | |
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| 55 | _leonbare_irq_entry: |
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| 56 | |
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| 57 | SAVE_ALL_FAST(.L3) ! fast irq processing, volatile %g6, use frame |
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| 58 | |
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| 59 | .L3: |
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| 60 | #ifdef __threadx__ |
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| 61 | set _tx_thread_system_state, %o0 |
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| 62 | ld [%o0],%o1 |
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| 63 | add %o1,1,%o1 |
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| 64 | st %o1,[%o0] |
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| 65 | #endif |
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| 66 | |
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| 67 | set nestcount,%o0 |
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| 68 | ld [%o0],%o1 |
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| 69 | add %o1,1,%o1 |
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| 70 | st %o1,[%o0] |
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| 71 | |
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| 72 | #ifdef CONFIG_LEONBARE_NONESTEDIRQ |
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| 73 | or %l0, SPARC_PSR_PIL_MASK, %o0 ! no nested irqs |
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| 74 | wr %o0, SPARC_PSR_ET_MASK, %psr |
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| 75 | WRITE_PAUSE |
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| 76 | #else |
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| 77 | sll %l7,SPARC_PSR_PIL_SHIFT,%o1 |
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| 78 | andn %l0,SPARC_PSR_PIL_MASK,%o0 |
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| 79 | or %o0, %o1, %o1 |
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| 80 | set nestedirq,%o0 |
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| 81 | ld [%o0],%o0 |
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| 82 | cmp %g0,%o0 ! no nested irqs? |
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| 83 | beq,a .L1 |
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| 84 | or %o1, SPARC_PSR_PIL_MASK, %o1 |
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| 85 | .L1: |
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| 86 | wr %o1, SPARC_PSR_ET_MASK, %psr |
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| 87 | WRITE_PAUSE |
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| 88 | #endif |
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| 89 | |
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| 90 | mov %l7, %o0 ! irq level |
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| 91 | call handler_irq ! void handler_irq (int irq, struct leonbare_pt_regs *pt_regs) |
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| 92 | #ifndef _SOFT_FLOAT |
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| 93 | add %sp, FW_REGS_SZ + 8 + SF_REGS_SZ , %o1 ! pt_regs ptr |
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| 94 | #else |
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| 95 | add %sp, SF_REGS_SZ , %o1 ! pt_regs ptr |
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| 96 | #endif |
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| 97 | |
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| 98 | or %l0, SPARC_PSR_PIL_MASK, %o1 |
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| 99 | wr %o1, SPARC_PSR_ET_MASK, %psr ! enable nesting again, keep ET up |
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| 100 | WRITE_PAUSE |
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| 101 | |
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| 102 | set nestcount,%o0 |
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| 103 | ld [%o0],%o1 |
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| 104 | sub %o1,1,%o1 |
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| 105 | st %o1,[%o0] |
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| 106 | |
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| 107 | #ifdef __threadx__ |
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| 108 | set _tx_thread_system_state, %o0 |
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| 109 | ld [%o0],%o1 |
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| 110 | sub %o1,1,%o1 |
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| 111 | st %o1,[%o0] |
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| 112 | #endif |
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| 113 | |
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| 114 | RESTORE_ALL_FAST |
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| 115 | |
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| 116 | .seg "data" |
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| 117 | .global nestedirq |
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| 118 | .align 4 |
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| 119 | nestedirq: |
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| 120 | .long 0 |
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| 121 | .global fastirq |
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| 122 | .align 4 |
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| 123 | fastirq: |
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| 124 | .long 0 |
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| 125 | .global nestcount |
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| 126 | .align 4 |
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| 127 | nestcount: |
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| 128 | .long 0 |
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