[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 | /* The traptable has to be the first code in a boot PROM. */ |
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| 27 | |
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| 28 | #include <asm-leon/head.h> |
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| 29 | |
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| 30 | #define TRAP(H) mov %psr, %l0; sethi %hi(H), %l4; jmp %l4+%lo(H); nop; |
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| 31 | #define TRAPL(H) nop; sethi %hi(H), %g1; jmp %g1+%lo(H); nop; |
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| 32 | #define TRAP_ENTRY(H) rd %psr, %l0; b H; rd %wim, %l3; nop; |
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| 33 | |
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| 34 | #define WIM_INIT 2 |
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| 35 | #ifdef _SOFT_FLOAT |
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| 36 | #define PSR_INIT 0x0e0 |
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| 37 | #else |
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| 38 | #define PSR_INIT 0x10e0 |
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| 39 | #endif |
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| 40 | |
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| 41 | #define NUMREGWINDOWS 8 |
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| 42 | |
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| 43 | /* Unexcpected trap will halt the processor by forcing it to error state */ |
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| 44 | #define BAD_TRAP ta 0; nop; nop; nop; |
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| 45 | |
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| 46 | /* Software trap. Treat as BAD_TRAP */ |
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| 47 | #define SOFT_TRAP BAD_TRAP |
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| 48 | |
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| 49 | .seg "text" |
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| 50 | .global _trap_table, start, _start, cpuinit, leonbare_irq_entry, _hardreset |
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| 51 | .global _window_overflow, _window_underflow, _flush_windows, _fpdis_enable |
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| 52 | /*.global _nwindows, _leon_version, _nwindows_min1*/ |
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| 53 | |
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| 54 | |
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| 55 | ! |
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| 56 | ! Startup code for standalone system. Wash IU and FPU (if present) registers. |
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| 57 | ! The registers have to be written to initiate the parity bits. |
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| 58 | ! |
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| 59 | .section .text |
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| 60 | /* ------- */ |
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| 61 | .weak _hardreset |
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| 62 | .set _hardreset,_hardreset_libgloss |
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| 63 | /* ------- */ |
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| 64 | |
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| 65 | .global _hardreset_custom_weak, _hardreset_real, _cleanregs_custom_weak, _hardreset_custom_svt_weak |
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| 66 | |
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| 67 | _hardreset_real: |
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| 68 | nop |
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| 69 | _hardreset_libgloss: |
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| 70 | set _hardreset_custom_weak, %g1 ! possible mkprom init code here, default links to dummy _hardreset_custom_dummy |
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| 71 | call %g1 |
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| 72 | nop |
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| 73 | |
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| 74 | set _trap_table, %g1 ! Initialize TBR |
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| 75 | mov %g1, %tbr |
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| 76 | |
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| 77 | set _hardreset_custom_svt_weak, %g1 ! give mkprom svt chance to reset tbr |
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| 78 | call %g1 |
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| 79 | nop |
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| 80 | |
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| 81 | set _cleanregs_custom_weak, %g1 |
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| 82 | call %g1 |
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| 83 | nop |
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| 84 | |
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| 85 | #ifdef _FLAT |
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| 86 | mov %g0, %wim |
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| 87 | #else |
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| 88 | /* ! assume that %sp is correct use cwp of psr to set the next window as invalid |
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| 89 | mov %psr, %g2 ! extract cwp |
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| 90 | and 0x1f, %g2,%g2 |
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| 91 | set 0x1, %g3 |
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| 92 | sll %g3,%g2,%g3 ! the bit mask for cwp |
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| 93 | |
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| 94 | sll %g3, 1, %g4 ! rotate one to left |
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| 95 | sethi %hi(_nwindows_min1), %g5 ! NWINDOWS-1 |
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| 96 | ld [%g5+%lo(_nwindows_min1)], %g5 |
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| 97 | srl %g3, %g5, %g5 |
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| 98 | or %g5, %g4, %g5 |
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| 99 | mov %g5, %wim |
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| 100 | nop; nop; nop */ |
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| 101 | #endif |
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| 102 | |
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| 103 | /* |
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| 104 | mov %psr, %g2 |
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| 105 | set 0x202, %g3 |
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| 106 | sll %g3, %g2, %g2 |
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| 107 | mov %g2, %wim |
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| 108 | nop; nop; nop |
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| 109 | 1: |
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| 110 | */ |
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| 111 | ! ------------------------------- |
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| 112 | ! only cpu 0 initializes |
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| 113 | /* mov %psr, %g5 |
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| 114 | srl %g5, 24, %g5 |
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| 115 | and %g5, 3, %g5 |
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| 116 | subcc %g5, 3, %g0 ! leon2: 0 or 2, leon3: 3 |
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| 117 | bne callcpuinit |
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| 118 | nop |
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| 119 | */ |
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| 120 | |
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| 121 | rd %asr17,%g5 |
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| 122 | srl %g5,28,%g5 |
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| 123 | cmp %g5,%g0 |
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| 124 | bne slavego |
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| 125 | nop |
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| 126 | |
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| 127 | callcpuinit: |
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| 128 | call cpuinit |
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| 129 | nop |
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| 130 | |
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| 131 | call pnpinit |
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| 132 | nop |
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| 133 | |
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| 134 | slavego: |
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| 135 | ! ------------------------------- |
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| 136 | |
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| 137 | sub %sp, 0x40, %sp ! room for main to save args |
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| 138 | call _start |
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| 139 | nop |
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| 140 | |
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| 141 | mov 1, %g1 |
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| 142 | ta 0 ! Halt if _main would return ... |
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| 143 | nop |
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| 144 | |
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| 145 | .global _fpdis,_fpdis_svt |
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| 146 | _fpdis_svt: |
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| 147 | _fpdis: |
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| 148 | set 0x1000, %l4 |
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| 149 | andcc %l0, %l4, %l3 |
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| 150 | bne,a 4f |
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| 151 | andn %l0, %l4, %l0 |
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| 152 | ta 0 |
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| 153 | 4: |
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| 154 | mov %l0, %psr ! restore %psr |
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| 155 | nop; nop; nop |
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| 156 | jmp %l2 ! Jump to nPC |
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| 157 | rett %l2 + 4 |
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| 158 | |
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| 159 | |
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| 160 | /* |
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| 161 | !'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' |
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| 162 | .section .bss |
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| 163 | .global _nwindows, _leon_version, _nwindows_min1 |
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| 164 | _nwindows: |
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| 165 | .word 8 |
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| 166 | _nwindows_min1: |
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| 167 | .word 7 |
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| 168 | _leon_version: |
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| 169 | .word 3 |
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| 170 | */ |
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