board_bwct.c revision 159814
1/*- 2 * Copyright (c) 1994-1998 Mark Brinicombe. 3 * Copyright (c) 1994 Brini. 4 * All rights reserved. 5 * 6 * This code is derived from software written for Brini by Mark Brinicombe 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 Brini. 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 BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * 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 * RiscBSD kernel project 36 * 37 * machdep.c 38 * 39 * Machine dependant functions for kernel setup 40 * 41 * This file needs a lot of work. 42 * 43 * Created : 17/09/94 44 */ 45 46#include "opt_msgbuf.h" 47#include "opt_ddb.h" 48 49#include <sys/cdefs.h> 50__FBSDID("$FreeBSD: head/sys/arm/at91/kb920x_machdep.c 159814 2006-06-20 23:40:04Z imp $"); 51 52#define _ARM32_BUS_DMA_PRIVATE 53#include <sys/param.h> 54#include <sys/systm.h> 55#include <sys/sysproto.h> 56#include <sys/signalvar.h> 57#include <sys/imgact.h> 58#include <sys/kernel.h> 59#include <sys/ktr.h> 60#include <sys/linker.h> 61#include <sys/lock.h> 62#include <sys/malloc.h> 63#include <sys/mutex.h> 64#include <sys/pcpu.h> 65#include <sys/proc.h> 66#include <sys/ptrace.h> 67#include <sys/cons.h> 68#include <sys/bio.h> 69#include <sys/bus.h> 70#include <sys/buf.h> 71#include <sys/exec.h> 72#include <sys/kdb.h> 73#include <sys/msgbuf.h> 74#include <machine/reg.h> 75#include <machine/cpu.h> 76 77#include <vm/vm.h> 78#include <vm/pmap.h> 79#include <vm/vm.h> 80#include <vm/vm_object.h> 81#include <vm/vm_page.h> 82#include <vm/vm_pager.h> 83#include <vm/vm_map.h> 84#include <vm/vnode_pager.h> 85#include <machine/pmap.h> 86#include <machine/vmparam.h> 87#include <machine/pcb.h> 88#include <machine/undefined.h> 89#include <machine/machdep.h> 90#include <machine/metadata.h> 91#include <machine/armreg.h> 92#include <machine/bus.h> 93#include <sys/reboot.h> 94 95#include <arm/at91/at91rm92reg.h> 96 97#define KERNEL_PT_SYS 0 /* Page table for mapping proc0 zero page */ 98#define KERNEL_PT_KERN 1 99#define KERNEL_PT_KERN_NUM 22 100#define KERNEL_PT_AFKERNEL KERNEL_PT_KERN + KERNEL_PT_KERN_NUM /* L2 table for mapping after kernel */ 101#define KERNEL_PT_AFKERNEL_NUM 5 102 103/* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */ 104#define NUM_KERNEL_PTS (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM) 105 106/* Define various stack sizes in pages */ 107#define IRQ_STACK_SIZE 1 108#define ABT_STACK_SIZE 1 109#define UND_STACK_SIZE 1 110 111extern u_int data_abort_handler_address; 112extern u_int prefetch_abort_handler_address; 113extern u_int undefined_handler_address; 114 115struct pv_addr kernel_pt_table[NUM_KERNEL_PTS]; 116 117extern void *_end; 118 119extern int *end; 120 121struct pcpu __pcpu; 122struct pcpu *pcpup = &__pcpu; 123 124/* Physical and virtual addresses for some global pages */ 125 126vm_paddr_t phys_avail[10]; 127vm_paddr_t dump_avail[4]; 128vm_offset_t physical_pages; 129vm_offset_t clean_sva, clean_eva; 130 131struct pv_addr systempage; 132struct pv_addr msgbufpv; 133struct pv_addr irqstack; 134struct pv_addr undstack; 135struct pv_addr abtstack; 136struct pv_addr kernelstack; 137struct pv_addr minidataclean; 138 139static struct trapframe proc0_tf; 140 141/* Static device mappings. */ 142static const struct pmap_devmap kb920x_devmap[] = { 143 /* 144 * Map the on-board devices VA == PA so that we can access them 145 * with the MMU on or off. 146 */ 147 { 148 /* 149 * This at least maps the interrupt controller, the UART 150 * and the timer. Other devices should use newbus to 151 * map their memory anyway. 152 */ 153 0xfff00000, 154 0xfff00000, 155 0x100000, 156 VM_PROT_READ|VM_PROT_WRITE, 157 PTE_NOCACHE, 158 }, 159 { 160 /* 161 * Add the ohci controller, and anything else that might be 162 * on this chip select for a VA/PA mapping. 163 */ 164 AT91RM92_OHCI_BASE, 165 AT91RM92_OHCI_BASE, 166 AT91RM92_OHCI_SIZE, 167 VM_PROT_READ|VM_PROT_WRITE, 168 PTE_NOCACHE, 169 }, 170 { 171 0, 172 0, 173 0, 174 0, 175 0, 176 } 177}; 178 179#define SDRAM_START 0xa0000000 180 181#ifdef DDB 182extern vm_offset_t ksym_start, ksym_end; 183#endif 184 185static long 186board_init(void) 187{ 188 uint32_t *SDRAMC = (uint32_t *)(AT91RM92_BASE + AT91RM92_SDRAMC_BASE); 189 uint32_t cr, mr; 190 int banks, rows, cols, bw; /* log2 size */ 191 192 cr = SDRAMC[AT91RM92_SDRAMC_CR / 4]; 193 mr = SDRAMC[AT91RM92_SDRAMC_MR / 4]; 194 bw = (mr & AT91RM92_SDRAMC_MR_DBW_16) ? 1 : 2; 195 banks = (cr & AT91RM92_SDRAMC_CR_NB_4) ? 2 : 1; 196 rows = ((cr & AT91RM92_SDRAMC_CR_NR_MASK) >> 2) + 11; 197 cols = (cr & AT91RM92_SDRAMC_CR_NC_MASK) + 8; 198 return (1 << (cols + rows + banks + bw)); 199} 200 201void * 202initarm(void *arg, void *arg2) 203{ 204 struct pv_addr kernel_l1pt; 205 int loop; 206 u_int l1pagetable; 207 vm_offset_t freemempos; 208 vm_offset_t afterkern; 209 int i = 0; 210 uint32_t fake_preload[35]; 211 uint32_t memsize; 212 vm_offset_t lastaddr; 213#ifdef DDB 214 vm_offset_t zstart = 0, zend = 0; 215#endif 216 217 i = 0; 218 219 set_cpufuncs(); 220 221 fake_preload[i++] = MODINFO_NAME; 222 fake_preload[i++] = strlen("elf kernel") + 1; 223 strcpy((char*)&fake_preload[i++], "elf kernel"); 224 i += 2; 225 fake_preload[i++] = MODINFO_TYPE; 226 fake_preload[i++] = strlen("elf kernel") + 1; 227 strcpy((char*)&fake_preload[i++], "elf kernel"); 228 i += 2; 229 fake_preload[i++] = MODINFO_ADDR; 230 fake_preload[i++] = sizeof(vm_offset_t); 231 fake_preload[i++] = KERNBASE; 232 fake_preload[i++] = MODINFO_SIZE; 233 fake_preload[i++] = sizeof(uint32_t); 234 fake_preload[i++] = (uint32_t)&end - KERNBASE; 235#ifdef DDB 236 if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) { 237 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM; 238 fake_preload[i++] = sizeof(vm_offset_t); 239 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4); 240 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM; 241 fake_preload[i++] = sizeof(vm_offset_t); 242 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8); 243 lastaddr = *(uint32_t *)(KERNVIRTADDR + 8); 244 zend = lastaddr; 245 zstart = *(uint32_t *)(KERNVIRTADDR + 4); 246 ksym_start = zstart; 247 ksym_end = zend; 248 } else 249#endif 250 lastaddr = (vm_offset_t)&end; 251 252 fake_preload[i++] = 0; 253 fake_preload[i] = 0; 254 preload_metadata = (void *)fake_preload; 255 256 257 pcpu_init(pcpup, 0, sizeof(struct pcpu)); 258 PCPU_SET(curthread, &thread0); 259 260#define KERNEL_TEXT_BASE (KERNBASE) 261 freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK; 262 /* Define a macro to simplify memory allocation */ 263#define valloc_pages(var, np) \ 264 alloc_pages((var).pv_va, (np)); \ 265 (var).pv_pa = (var).pv_va + (KERNPHYSADDR - KERNVIRTADDR); 266 267#define alloc_pages(var, np) \ 268 (var) = freemempos; \ 269 freemempos += (np * PAGE_SIZE); \ 270 memset((char *)(var), 0, ((np) * PAGE_SIZE)); 271 272 while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0) 273 freemempos += PAGE_SIZE; 274 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE); 275 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) { 276 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) { 277 valloc_pages(kernel_pt_table[loop], 278 L2_TABLE_SIZE / PAGE_SIZE); 279 } else { 280 kernel_pt_table[loop].pv_va = freemempos - 281 (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) * 282 L2_TABLE_SIZE_REAL; 283 kernel_pt_table[loop].pv_pa = 284 kernel_pt_table[loop].pv_va - KERNVIRTADDR + 285 KERNPHYSADDR; 286 } 287 i++; 288 } 289 /* 290 * Allocate a page for the system page mapped to V0x00000000 291 * This page will just contain the system vectors and can be 292 * shared by all processes. 293 */ 294 valloc_pages(systempage, 1); 295 296 /* Allocate stacks for all modes */ 297 valloc_pages(irqstack, IRQ_STACK_SIZE); 298 valloc_pages(abtstack, ABT_STACK_SIZE); 299 valloc_pages(undstack, UND_STACK_SIZE); 300 valloc_pages(kernelstack, KSTACK_PAGES); 301 alloc_pages(minidataclean.pv_pa, 1); 302 valloc_pages(msgbufpv, round_page(MSGBUF_SIZE) / PAGE_SIZE); 303 /* 304 * Now we start construction of the L1 page table 305 * We start by mapping the L2 page tables into the L1. 306 * This means that we can replace L1 mappings later on if necessary 307 */ 308 l1pagetable = kernel_l1pt.pv_va; 309 310 /* Map the L2 pages tables in the L1 page table */ 311 pmap_link_l2pt(l1pagetable, ARM_VECTORS_LOW, 312 &kernel_pt_table[KERNEL_PT_SYS]); 313 for (i = 0; i < KERNEL_PT_KERN_NUM; i++) 314 pmap_link_l2pt(l1pagetable, KERNBASE + i * 0x100000, 315 &kernel_pt_table[KERNEL_PT_KERN + i]); 316 pmap_map_chunk(l1pagetable, KERNBASE, KERNPHYSADDR, 317 (((uint32_t)(lastaddr) - KERNBASE) + PAGE_SIZE) & ~(PAGE_SIZE - 1), 318 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 319 afterkern = round_page((lastaddr + L1_S_SIZE) & ~(L1_S_SIZE 320 - 1)); 321 for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) { 322 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000, 323 &kernel_pt_table[KERNEL_PT_AFKERNEL + i]); 324 } 325 pmap_map_entry(l1pagetable, afterkern, minidataclean.pv_pa, 326 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 327 328 329 /* Map the vector page. */ 330 pmap_map_entry(l1pagetable, ARM_VECTORS_LOW, systempage.pv_pa, 331 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 332 /* Map the stack pages */ 333 pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa, 334 IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 335 pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa, 336 ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 337 pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa, 338 UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 339 pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa, 340 KSTACK_PAGES * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 341 342 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa, 343 L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE); 344 pmap_map_chunk(l1pagetable, msgbufpv.pv_va, msgbufpv.pv_pa, 345 MSGBUF_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE); 346 347 348 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) { 349 pmap_map_chunk(l1pagetable, kernel_pt_table[loop].pv_va, 350 kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE, 351 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE); 352 } 353 354 pmap_devmap_bootstrap(l1pagetable, kb920x_devmap); 355 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT); 356 setttb(kernel_l1pt.pv_pa); 357 cpu_tlb_flushID(); 358 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)); 359 cninit(); 360 memsize = board_init(); 361 physmem = memsize / PAGE_SIZE; 362 363 /* 364 * Pages were allocated during the secondary bootstrap for the 365 * stacks for different CPU modes. 366 * We must now set the r13 registers in the different CPU modes to 367 * point to these stacks. 368 * Since the ARM stacks use STMFD etc. we must set r13 to the top end 369 * of the stack memory. 370 */ 371 372 cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE); 373 set_stackptr(PSR_IRQ32_MODE, 374 irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE); 375 set_stackptr(PSR_ABT32_MODE, 376 abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE); 377 set_stackptr(PSR_UND32_MODE, 378 undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE); 379 380 381 382 /* 383 * We must now clean the cache again.... 384 * Cleaning may be done by reading new data to displace any 385 * dirty data in the cache. This will have happened in setttb() 386 * but since we are boot strapping the addresses used for the read 387 * may have just been remapped and thus the cache could be out 388 * of sync. A re-clean after the switch will cure this. 389 * After booting there are no gross reloations of the kernel thus 390 * this problem will not occur after initarm(). 391 */ 392 cpu_idcache_wbinv_all(); 393 394 /* Set stack for exception handlers */ 395 396 data_abort_handler_address = (u_int)data_abort_handler; 397 prefetch_abort_handler_address = (u_int)prefetch_abort_handler; 398 undefined_handler_address = (u_int)undefinedinstruction_bounce; 399 undefined_init(); 400 401 proc_linkup(&proc0, &ksegrp0, &thread0); 402 thread0.td_kstack = kernelstack.pv_va; 403 thread0.td_pcb = (struct pcb *) 404 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 405 thread0.td_pcb->pcb_flags = 0; 406 thread0.td_frame = &proc0_tf; 407 pcpup->pc_curpcb = thread0.td_pcb; 408 409 arm_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL); 410 411 pmap_curmaxkvaddr = afterkern + 0x100000 * (KERNEL_PT_KERN_NUM - 1); 412 pmap_bootstrap(freemempos, 413 KERNVIRTADDR + 3 * memsize, 414 &kernel_l1pt); 415 msgbufp = (void*)msgbufpv.pv_va; 416 msgbufinit(msgbufp, MSGBUF_SIZE); 417 mutex_init(); 418 419 i = 0; 420 dump_avail[0] = KERNPHYSADDR; 421 dump_avail[1] = KERNPHYSADDR + memsize; 422 dump_avail[2] = 0; 423 dump_avail[3] = 0; 424 425 phys_avail[0] = freemempos - KERNVIRTADDR + KERNPHYSADDR; 426 phys_avail[1] = KERNPHYSADDR + memsize; 427 phys_avail[2] = 0; 428 phys_avail[3] = 0; 429 /* Do basic tuning, hz etc */ 430 init_param1(); 431 init_param2(physmem); 432 avail_end = KERNPHYSADDR + memsize - 1; 433 kdb_init(); 434 return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP - 435 sizeof(struct pcb))); 436} 437