armadillo9_start.S revision 1.1.4.2
1 /* $NetBSD: armadillo9_start.S,v 1.1.4.2 2005/12/11 10:28:16 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2003 5 * Ichiro FUKUHARA <ichiro (at) ichiro.org>. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Ichiro FUKUHARA. 19 * 4. The name of the company nor the name of the author may be used to 20 * endorse or promote products derived from this software without specific 21 * prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR 27 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 #include <machine/asm.h> 36 #include <arm/armreg.h> 37 #include <arm/arm32/pte.h> 38 39 .section .start,"ax",%progbits 40 41 .global _C_LABEL(armadillo9_start) 42 _C_LABEL(armadillo9_start): 43 44 /* make sure svc mode and all fiqs&irqs disabled */ 45 mov r0, #(PSR_SVC32_MODE | I32_bit | F32_bit) 46 msr cpsr_c, r0 47 48 /* 49 * We will go ahead and disable the MMU here so that we don't 50 * have to worry about flushing caches, etc. 51 * 52 * Note that we may not currently be running VA==PA, which means 53 * we'll need to leap to the next insn after disabing the MMU. 54 */ 55 adr r8, Lunmapped 56 bic r8, r8, #0xff000000 /* clear upper 8 bits */ 57 orr r8, r8, #0xc0000000 /* OR in physical base address */ 58 59 /* 60 * Setup coprocessor 15. 61 */ 62 mrc p15, 0, r2, c1, c0, 0 63 bic r2, r2, #CPU_CONTROL_MMU_ENABLE 64 bic r2, r2, #CPU_CONTROL_DC_ENABLE 65 bic r2, r2, #CPU_CONTROL_IC_ENABLE 66 mcr p15, 0, r2, c1, c0, 0 67 68 nop 69 nop 70 nop 71 mov pc, r8 /* Heave-ho! */ 72 73 Lunmapped: 74 #ifdef VERBOSE_INIT_ARM 75 /* set temporary stack pointer */ 76 adr sp, Ltable 77 ldr sp, [sp] 78 79 /* initialize UART1 */ 80 bl init_UART1 81 #endif 82 /* copy to virtual address */ 83 adr r0, Lsection 84 ldmia r0, {r0, r1, r2} /* r0: kernel(load) start address */ 85 /* r1: kernel(virtual) start address */ 86 /* r2: kernel(virtual) end address */ 87 sub r3, r2, r1 /* r3: kernel size */ 88 add r4, r0, r3 /* r4: kernel(load) end address */ 89 #ifdef VERBOSE_INIT_ARM 90 #define putc(c) \ 91 mov r5, c ;\ 92 bl print_char 93 putc(#'c') 94 putc(#'o') 95 putc(#'p') 96 putc(#'y') 97 putc(#' ') 98 putc(#'f') 99 putc(#'r') 100 putc(#'o') 101 putc(#'m') 102 putc(#' ') 103 bl print_r0 104 putc(#' ') 105 putc(#'t') 106 putc(#'o') 107 putc(#' ') 108 bl print_r1 109 putc(#' ') 110 putc(#'s') 111 putc(#'i') 112 putc(#'z') 113 putc(#'e') 114 putc(#' ') 115 bl print_r3 116 bl print_cr 117 #endif 118 1: 119 ldr r5, [r4], #-4 120 str r5, [r2], #-4 121 cmp r4, r0 122 bge 1b 123 124 /* 125 * We want to construct a memory map that maps us 126 * VA==PA (SDRAM at 0xc0000000). We create these 127 * mappings uncached and unbuffered to be safe. 128 */ 129 /* 130 * Step 1: Map the entire address space VA==PA. 131 */ 132 adr r4, Ltable 133 ldr r0, [r4] /* r0 = &l1table */ 134 mov r1, #(L1_TABLE_SIZE / 4) /* 4096 entry */ 135 mov r2, #(L1_S_SIZE) /* 1MB / section */ 136 mov r3, #(L1_S_AP(AP_KRW)) /* kernel read/write */ 137 orr r3, r3, #(L1_TYPE_S) /* L1 entry is section */ 138 1: 139 str r3, [r0], #0x04 140 add r3, r3, r2 141 subs r1, r1, #1 142 bgt 1b 143 144 /* 145 * Step 2: Map VA 0xf0000000->0xf00fffff to PA 0x80000000->0x800fffff. 146 */ 147 ldr r0, [r4] 148 add r0, r0, #(0xf00 * 4) /* offset to 0xf0000000 */ 149 mov r3, #(L1_S_AP(AP_KRW)) /* kernel read/write */ 150 orr r3, r3, #(L1_TYPE_S) /* L1 entry is section */ 151 orr r3, r3, #0x80000000 152 str r3, [r0], #4 153 154 /* 155 * Step 3: Map VA 0xf0100000->0xf02fffff to PA 0x80800000->0x809fffff. 156 */ 157 mov r3, #(L1_S_AP(AP_KRW)) /* kernel read/write */ 158 orr r3, r3, #(L1_TYPE_S) /* L1 entry is section */ 159 orr r3, r3, #0x80000000 160 orr r3, r3, #0x00800000 161 str r3, [r0], #0x4 162 add r3, r3, r2 163 str r3, [r0], #0x4 164 165 /* OK! Page table is set up. Give it to the CPU. */ 166 adr r0, Ltable 167 ldr r0, [r0] 168 mcr p15, 0, r0, c2, c0, 0 169 170 /* Flush the old TLBs, just in case. */ 171 mcr p15, 0, r0, c8, c7, 0 172 173 /* Set the Domain Access register. Very important! */ 174 mov r0, #1 175 mcr p15, 0, r0, c3, c0, 0 176 177 /* Get ready to jump to the "real" kernel entry point... */ 178 ldr r1, Lstart 179 mov r1, r1 /* Make sure the load completes! */ 180 181 /* OK, let's enable the MMU. */ 182 mrc p15, 0, r2, c1, c0, 0 183 orr r2, r2, #CPU_CONTROL_MMU_ENABLE 184 mcr p15, 0, r2, c1, c0, 0 185 186 nop 187 nop 188 nop 189 190 /* CPWAIT sequence to make sure the MMU is on... */ 191 mrc p15, 0, r2, c2, c0, 0 /* arbitrary read of CP15 */ 192 mov r2, r2 /* force it to complete */ 193 mov pc, r1 /* leap to kernel entry point! */ 194 195 Ltable: 196 .word armadillo9_start - L1_TABLE_SIZE 197 198 Lstart: 199 .word start 200 201 Lsection: 202 .word .start 203 .word 0xc0200000 204 .word __bss_start 205 206 #ifdef VERBOSE_INIT_ARM 207 init_UART1: 208 stmfd sp!, {r4, r5, lr} 209 mov r4, #0x80000000 210 add r4, r4, #0x008c0000 211 ldr r5, [r4, #0x08] 212 orr r5, r5, #0x10 213 str r5, [r4, #0x08] /* enable FIFO */ 214 mov r5, #0x01 215 str r5, [r4, #0x14] /* disable interrupt */ 216 ldmfd sp!, {r4, r5, pc} 217 218 print_char: /* char = r5 */ 219 stmfd sp!, {r4, r6, lr} 220 mov r4, #0x80000000 221 add r4, r4, #0x008c0000 222 1: 223 ldr r6, [r4, #0x18] 224 tst r6, #0x20 /* check TXFF */ 225 bne 1b 226 str r5, [r4, #0x00] 227 ldmfd sp!, {r4, r6, pc} 228 229 print_cr: 230 stmfd sp!, {r5, lr} 231 mov r5, #0x0d /* cr */ 232 bl print_char 233 mov r5, #0x0a /* lf */ 234 bl print_char 235 ldmfd sp!, {r5, pc} 236 237 print_r0: 238 stmfd sp!, {r0, r4-r7, lr} 239 mov r4, #28 240 mov r6, #0xf 241 1: 242 and r7, r6, r0, ROR r4 243 cmp r7, #10 244 addlt r5, r7, #'0' 245 addge r5, r7, #('a' - 0x0a) 246 bl print_char 247 subs r4, r4, #4 248 bge 1b 249 ldmfd sp!, {r0, r4-r7, pc} 250 251 #define print_register(reg) \ 252 stmfd sp!, {r0, lr} ;\ 253 mov r0, reg ;\ 254 bl print_r0 ;\ 255 ldmfd sp!, {r0, pc} 256 257 print_r1: 258 print_register(r1) 259 260 print_r2: 261 print_register(r2) 262 263 print_r3: 264 print_register(r3) 265 266 print_r4: 267 print_register(r4) 268 269 print_r5: 270 print_register(r5) 271 272 print_r6: 273 print_register(r6) 274 275 print_r7: 276 print_register(r7) 277 278 print_r8: 279 print_register(r8) 280 281 print_r9: 282 print_register(r9) 283 284 print_r10: 285 print_register(r10) 286 287 print_r11: 288 print_register(r11) 289 290 print_r12: 291 print_register(r12) 292 #endif 293
Indexes created Sun Oct 19 19:09:49 GMT 2025