[566a1806] | 1 | # |
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| 2 | # Copyright (c) 2006 Martin Decky |
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| 3 | # Copyright (c) 2006 Jakub Jermar |
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| 4 | # All rights reserved. |
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| 5 | # |
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| 6 | # Redistribution and use in source and binary forms, with or without |
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| 7 | # modification, are permitted provided that the following conditions |
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| 8 | # are met: |
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| 9 | # |
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| 10 | # - Redistributions of source code must retain the above copyright |
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| 11 | # notice, this list of conditions and the following disclaimer. |
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| 12 | # - Redistributions in binary form must reproduce the above copyright |
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| 13 | # notice, this list of conditions and the following disclaimer in the |
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| 14 | # documentation and/or other materials provided with the distribution. |
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| 15 | # - The name of the author may not be used to endorse or promote products |
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| 16 | # derived from this software without specific prior written permission. |
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| 17 | # |
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| 18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | # |
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| 29 | |
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| 30 | /* |
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| 31 | * start.S |
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| 32 | * |
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| 33 | * Start code for Sparc64 RTEMS |
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| 34 | * |
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| 35 | * This is based on the boot.S file of the HelenOS sparc64 architecture. |
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| 36 | * http://www.helenos.org/ |
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| 37 | * ${helenos}/boot/arch/sparc64/loader/boot.S |
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| 38 | * |
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| 39 | * Modifications for the RTEMS executive are |
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| 40 | * COPYRIGHT (c) 2010 Gedare Bloom. |
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| 41 | * COPYRIGHT (c) 2010 Eugen Leontie. |
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| 42 | * |
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| 43 | * $Id$ |
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| 44 | */ |
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| 45 | |
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| 46 | #include <rtems/asm.h> |
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| 47 | #include <rtems/score/cpu.h> |
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| 48 | |
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| 49 | #define PSTATE_PRIV_BIT 4 |
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| 50 | |
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| 51 | .register %g2, #scratch |
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| 52 | .register %g3, #scratch |
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| 53 | .register %g6, #scratch |
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| 54 | .register %g7, #scratch |
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| 55 | |
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| 56 | #if 0 |
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| 57 | #define _BSP_DEBUG |
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| 58 | #endif |
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| 59 | |
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| 60 | #if _BSP_DEBUG |
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| 61 | /* |
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| 62 | * This is for debug and script support to identify RTEMS app termination |
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| 63 | */ |
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| 64 | .section .data |
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| 65 | .align 8 |
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| 66 | _end_token_string: |
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| 67 | .asciz "END_TOKEN\n" |
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| 68 | #endif |
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| 69 | |
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| 70 | .section BOOTSTRAP, "ax" |
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| 71 | |
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| 72 | PUBLIC(_start) |
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| 73 | .global _start |
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| 74 | SYM(_start): |
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| 75 | start: |
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| 76 | b 1f |
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| 77 | nop |
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| 78 | |
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| 79 | /* |
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| 80 | * This header forces SILO to load the image at 0x4000. |
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| 81 | * More precisely, SILO will think this is an old version of Linux. |
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| 82 | */ |
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| 83 | .ascii "HdrS" |
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| 84 | .word 0 |
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| 85 | .half 0 |
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| 86 | .half 0 |
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| 87 | .half 0 |
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| 88 | .half 0 |
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| 89 | .global silo_ramdisk_image |
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| 90 | silo_ramdisk_image: |
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| 91 | .word 0 |
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| 92 | .global silo_ramdisk_size |
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| 93 | silo_ramdisk_size: |
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| 94 | .word 0 |
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| 95 | |
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| 96 | .align 8 |
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| 97 | 1: |
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| 98 | /* |
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| 99 | * Disable interrupts and disable address masking. |
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| 100 | */ |
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| 101 | wrpr %g0, PSTATE_PRIV_BIT, %pstate |
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| 102 | |
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| 103 | wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 2, %cansave ! set maximum saveable windows |
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| 104 | wrpr %g0, 0, %canrestore ! get rid of windows we will never need again |
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| 105 | wrpr %g0, 0, %otherwin ! make sure the window state is consistent |
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| 106 | wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel |
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| 107 | |
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| 108 | /* g4 needs to be cleared for gcc */ |
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| 109 | mov %g0, %g4 |
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| 110 | |
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| 111 | /* Clear the bss */ |
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| 112 | setx SYM(bss_start), %l0, %g2 ! g2 = start of bss |
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| 113 | setx SYM(_end), %l0, %g3 ! g3 = end of bss |
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| 114 | zerobss: |
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| 115 | stx %g0, [%g2] |
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| 116 | add %g2, 8, %g2 |
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| 117 | cmp %g2, %g3 |
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| 118 | bleu,a zerobss |
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| 119 | nop |
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| 120 | |
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| 121 | /* Install stack */ |
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| 122 | setstack: |
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| 123 | set SYM(StackStart), %sp |
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| 124 | add %sp, -STACK_BIAS, %sp |
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| 125 | |
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| 126 | setx ofw_cif, %l0, %l1 |
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| 127 | |
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| 128 | call ofw_init ! initialize OpenFirmware |
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| 129 | stx %o4, [%l1] |
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| 130 | |
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| 131 | call bootstrap |
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| 132 | nop |
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| 133 | |
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| 134 | /* BSP-specific pre-bootcard initializations */ |
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| 135 | call SYM(_BSP_init) |
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| 136 | nop |
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| 137 | |
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| 138 | /* Set up ISR handler for interrupt enable/disable */ |
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| 139 | setx SYM(syscall), %l0, %o1 |
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| 140 | setx param_space, %l0, %o2 |
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| 141 | call SYM(_CPU_ISR_install_raw_handler) |
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| 142 | mov 0x100, %o0 |
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| 143 | |
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| 144 | /* Don't need to copy initialized data to RAM--link puts all in RAM already */ |
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| 145 | |
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| 146 | mov %g0, %o0 ! clear command line passed to main |
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| 147 | call SYM(boot_card) |
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| 148 | sub %sp, 0x60, %sp ! make room on stack (necessary?) |
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| 149 | |
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| 150 | #if _BSP_DEBUG |
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| 151 | /* execution returns here when RTEMS terminates */ |
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| 152 | sethi %hi(_end_token_string), %g1 |
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| 153 | add %g1, %lo(_end_token_string), %o0 |
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| 154 | call SYM(printk) |
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| 155 | nop |
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| 156 | #endif |
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| 157 | |
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| 158 | call SYM(halt) |
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| 159 | nop |
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| 160 | |
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| 161 | halted: nop |
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| 162 | b SYM(halted) |
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| 163 | |
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| 164 | .align CPU_ALIGNMENT |
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| 165 | param_space: |
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| 166 | .space 8 |
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| 167 | |
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| 168 | .global _fini |
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| 169 | _fini: |
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| 170 | nop |
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| 171 | nop |
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| 172 | |
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| 173 | .global _init |
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| 174 | _init: |
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| 175 | nop |
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| 176 | nop |
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