| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 1 | /* |
| Michal Simek | cfc6711 | 2007-03-11 13:48:24 +0100 | [diff] [blame^] | 2 | * (C) Copyright 2007 Michal Simek |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 3 | * (C) Copyright 2004 Atmark Techno, Inc. |
| 4 | * |
| Michal Simek | cfc6711 | 2007-03-11 13:48:24 +0100 | [diff] [blame^] | 5 | * Michal SIMEK <monstr@monstr.eu> |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 6 | * Yasushi SHOJI <yashi@atmark-techno.com> |
| 7 | * |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| Michal Simek | cfc6711 | 2007-03-11 13:48:24 +0100 | [diff] [blame^] | 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <config.h> |
| 28 | |
| 29 | .text |
| 30 | .global _start |
| 31 | _start: |
| Michal Simek | cfc6711 | 2007-03-11 13:48:24 +0100 | [diff] [blame^] | 32 | mts rmsr, r0 /* disable cache */ |
| 33 | addi r1, r0, CFG_INIT_SP_OFFSET |
| 34 | /* add opcode instruction for 32bit jump - 2 instruction imm & brai*/ |
| 35 | addi r6, r0, 0xb000 /* hex b000 opcode imm */ |
| 36 | bslli r6, r6, 16 /* shift */ |
| 37 | swi r6, r0, 0x0 /* reset address */ |
| 38 | swi r6, r0, 0x8 /* user vector exception */ |
| 39 | swi r6, r0, 0x10 /* interrupt */ |
| 40 | swi r6, r0, 0x20 /* hardware exception */ |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 41 | |
| Michal Simek | cfc6711 | 2007-03-11 13:48:24 +0100 | [diff] [blame^] | 42 | addi r6, r0, 0xb808 /* hew b808 opcode brai*/ |
| 43 | bslli r6, r6, 16 |
| 44 | swi r6, r0, 0x4 /* reset address */ |
| 45 | swi r6, r0, 0xC /* user vector exception */ |
| 46 | swi r6, r0, 0x14 /* interrupt */ |
| 47 | swi r6, r0, 0x24 /* hardware exception */ |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 48 | |
| Michal Simek | cfc6711 | 2007-03-11 13:48:24 +0100 | [diff] [blame^] | 49 | #ifdef CFG_RESET_ADDRESS |
| 50 | /* reset address */ |
| 51 | addik r6, r0, CFG_RESET_ADDRESS |
| 52 | sw r6, r1, r0 |
| 53 | lhu r7, r1, r0 |
| 54 | shi r7, r0, 0x2 |
| 55 | shi r6, r0, 0x6 |
| 56 | #endif |
| 57 | |
| 58 | #ifdef CFG_USR_EXCEP |
| 59 | /* user_vector_exception */ |
| 60 | addik r6, r0, _exception_handler |
| 61 | sw r6, r1, r0 |
| 62 | lhu r7, r1, r0 |
| 63 | shi r7, r0, 0xa |
| 64 | shi r6, r0, 0xe |
| 65 | #endif |
| 66 | |
| 67 | #ifdef CFG_INTC_0 |
| 68 | /* interrupt_handler */ |
| 69 | addik r6, r0, _interrupt_handler |
| 70 | sw r6, r1, r0 |
| 71 | lhu r7, r1, r0 |
| 72 | shi r7, r0, 0x12 |
| 73 | shi r6, r0, 0x16 |
| 74 | #endif |
| 75 | |
| 76 | /* hardware exception */ |
| 77 | addik r6, r0, _hw_exception_handler |
| 78 | sw r6, r1, r0 |
| 79 | lhu r7, r1, r0 |
| 80 | shi r7, r0, 0x22 |
| 81 | shi r6, r0, 0x26 |
| 82 | |
| 83 | /* enable instruction and data cache */ |
| 84 | mfs r12, rmsr |
| 85 | ori r12, r12, 0xa0 |
| 86 | mts rmsr, r12 |
| 87 | |
| 88 | /* jumping to board_init */ |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 89 | brai board_init |
| wdenk | 507bbe3 | 2004-04-18 21:13:41 +0000 | [diff] [blame] | 90 | 1: bri 1b |