mpcsa_start.S revision 1.3
1 /* 2 * mpcsa_start.S 3 * Copyright (c) 2007, S. Kantoluoto <sami.kantoluoto (at) iki.fi> 4 * All rights reserved. 5 * 6 * Based on vx115_vep_start.S 7 * Copyright (c) 2007, J. Sevy <jsevy (at) cs.drexel.edu> 8 * 9 * Based on g42xxeb_start.S 10 * Copyright (c) 2002, 2003 Genetec Corporation. All rights reserved. 11 * Written by Hiroyuki Bessho for Genetec Corporation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of Genetec Corporation may not be used to endorse or 22 * promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENETEC CORPORATION 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <machine/asm.h> 39 #include <arm/armreg.h> 40 #include "assym.h" 41 42 RCSID("$NetBSD: mpcsa_start.S,v 1.3 2011/01/31 06:28:04 matt Exp $") 43 44 #ifndef FLASH_START 45 #define FLASH_START 0x10020000 46 #endif 47 48 #ifndef SDRAM_START 49 #define SDRAM_START 0x20000000 50 #endif 51 52 #define MODBASE 0x20200000 53 54 /* 55 * CPWAIT -- Canonical method to wait for CP15 update. 56 * NOTE: Clobbers the specified temp reg. 57 * copied from arm/arm/cpufunc_asm_xscale.S 58 * XXX: better be in a common header file. 59 */ 60 #define CPWAIT_BRANCH \ 61 sub pc, pc, #4 62 63 #define CPWAIT(tmp) \ 64 mrc p15, 0, tmp, c2, c0, 0 /* arbitrary read of CP15 */ ;\ 65 mov tmp, tmp /* wait for it to complete */ ;\ 66 CPWAIT_BRANCH /* branch to next insn */ 67 68 /* 69 * Kernel start routine for MPCSA board. 70 * This code is executed from Flash when the bootloader jumps to it. 71 */ 72 .text 73 74 .global _C_LABEL(mpcsa_start) 75 _C_LABEL(mpcsa_start): 76 77 /* make sure we're in supervisor mode */ 78 mov r0,sp 79 msr CPSR_c,#I32_bit | F32_bit | PSR_SVC32_MODE 80 mov sp,r0 81 82 /* move code to RAM */ 83 ldr r1, Lcopy_size 84 adr r0, _C_LABEL(mpcsa_start) 85 add r1, r1, #3 86 mov r1, r1, LSR #2 /* get size of code in words */ 87 mov r2, #SDRAM_START 88 add r2, r2, #0x200000 /* code placed 2MB above kernel base */ 89 mov r4, r2 90 91 /* copy kernel to RAM */ 92 5: ldr r3, [r0], #4 93 subs r1, r1, #1 94 str r3, [r2], #4 95 bhi 5b 96 97 /* jump to RAM */ 98 ldr r0, Lstart_off 99 add pc, r4, r0 100 101 102 Lcopy_size: .word _edata-_C_LABEL(mpcsa_start) 103 Lstart_off: .word mpcsa_start_ram-_C_LABEL(mpcsa_start) 104 105 mpcsa_start_ram: 106 /* 107 * Kernel is loaded in SDRAM (0x20200000), and is expected to run 108 * in VA 0xc0200000. 109 */ 110 111 /* build page table from scratch */ 112 ldr r0, Lstartup_pagetable 113 adr r4, mmu_init_table 114 b 3f 115 116 2: 117 str r3, [r0, r2] 118 add r2, r2, #4 119 add r3, r3, #(L1_S_SIZE) 120 adds r1, r1, #-1 121 bhi 2b 122 3: 123 ldmia r4!, {r1,r2,r3} /* # of sections, PA|attr, VA */ 124 cmp r1, #0 125 bne 2b 126 127 128 mcr p15, 0, r0, c2, c0, 0 /* Set TTB */ 129 mcr p15, 0, r0, c8, c7, 0 /* Flush TLB */ 130 131 /* Set the Domain Access register. Very important! */ 132 mov r0, #((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT) 133 mcr p15, 0, r0, c3, c0, 0 134 135 /* Enable MMU */ 136 mrc p15, 0, r0, c1, c0, 0 137 orr r0, r0, #CPU_CONTROL_MMU_ENABLE 138 mcr p15, 0, r0, c1, c0, 0 139 CPWAIT(r0) 140 141 /* Jump to kernel code in TRUE VA */ 142 adr r0, Lstart 143 ldr pc, [r0] 144 145 Lstart: 146 .word start 147 148 149 #define MMU_INIT(va,pa,n_sec,attr) \ 150 .word n_sec ;\ 151 .word 4*((va)>>L1_S_SHIFT) ;\ 152 .word (pa) | (attr) 153 154 #define STARTUP_PAGETABLE_ADDR 0x20100000 + 0x4000 155 156 Lstartup_pagetable: 157 .word STARTUP_PAGETABLE_ADDR 158 159 mmu_init_table: 160 /* fill all table VA==PA */ 161 MMU_INIT(0x00000000, 0x00000000, 1<<(32-L1_S_SHIFT), L1_TYPE_S|L1_S_AP_KRW) 162 /* map in peripheral space */ 163 MMU_INIT(0xfff00000, 0xfff00000, 1, L1_TYPE_S|L1_S_AP_KRW) 164 /* map SDRAM VA==PA, WT cacheable */ 165 MMU_INIT(0x20100000, 0x20100000, 63, L1_TYPE_S|L1_S_C|L1_S_AP_KRW) 166 /* map VA 0xc0000000..0xc0efffff to PA 0x20100000..0x23ffffff */ 167 MMU_INIT(0xc0000000, 0x20000000, 63, L1_TYPE_S|L1_S_C|L1_S_AP_KRW) 168 .word 0 /* end of table */ 169 170 .align 7 171 jme_module_header: 172 .word 0xe990510e /* magic number */ 173 .string "NetBSD/mpcsa\0\0\0" /* module name */ 174 .short 0 /* build flags */ 175 .short 0 /* flags */ 176 .word 0 /* version */ 177 .word 0 /* compile / link timestamp */ 178 .word MODBASE /* pointer to init routine */ 179 .word MODBASE /* start address */ 180 .word (_edata-(_C_LABEL(mpcsa_start))) /* length of module */ 181 .word (jme_module_header-_C_LABEL(mpcsa_start)+MODBASE) /* back pointer to module struct*/ 182 .word 0 /* data pointer (ignored but SBZ)*/ 183 .word 0 /* data length (ignored but SBZ)*/ 184 .word 0x20200000 /* alternate address */ 185 .word 0 /* reserved, SBZ */ 186 187 jme_kmodule_header: 188 .word 0xe000301e /* magic number */ 189 .string "JME kernel\0\0\0\0\0" /* module name */ 190 .short 0 /* build flags */ 191 .short 0 /* flags */ 192 .word 0 /* version */ 193 .word 0 /* compile / link timestamp */ 194 .word MODBASE /* pointer to init routine */ 195 .word MODBASE /* start address */ 196 .word (_edata-(_C_LABEL(mpcsa_start))) /* length of module */ 197 .word (jme_kmodule_header-_C_LABEL(mpcsa_start)+MODBASE) /* back pointer to module struct*/ 198 .word 0 /* data pointer (ignored but SBZ)*/ 199 .word 0 /* data length (ignored but SBZ)*/ 200 .word 0x20200000 /* alternate address */ 201 .word 0 /* reserved, SBZ */ 202
Indexes created Mon Oct 20 16:09:52 GMT 2025