xref: /netbsd-src/sys/arch/hpcarm/hpcarm/sa11x0_hpc_machdep.c (revision 357b7a3e802f8bcc048778dbaaaca4485ddbc565)
1 /*	$NetBSD: sa11x0_hpc_machdep.c,v 1.23 2023/08/03 08:16:31 mrg Exp $	*/
2 
3 /*
4  * Copyright (c) 1994-1998 Mark Brinicombe.
5  * Copyright (c) 1994 Brini.
6  * All rights reserved.
7  *
8  * This code is derived from software written for Brini by Mark Brinicombe
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *      This product includes software developed by Brini.
21  * 4. The name of the company nor the name of the author may be used to
22  *    endorse or promote products derived from this software without specific
23  *    prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
29  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 /*
39  * Machine dependent functions for kernel setup.
40  */
41 
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: sa11x0_hpc_machdep.c,v 1.23 2023/08/03 08:16:31 mrg Exp $");
44 
45 #include "opt_ddb.h"
46 #include "opt_dram_pages.h"
47 #include "opt_modular.h"
48 #include "ksyms.h"
49 
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
53 #include <sys/reboot.h>
54 #include <sys/proc.h>
55 #include <sys/msgbuf.h>
56 #include <sys/exec.h>
57 #include <sys/ksyms.h>
58 #include <sys/conf.h>	/* XXX for consinit related hacks */
59 #include <sys/device.h>
60 #include <sys/termios.h>
61 #include <sys/bus.h>
62 #include <sys/cpu.h>
63 #include <sys/intr.h>
64 
65 #if NKSYMS || defined(DDB) || defined(MODULAR)
66 #include <machine/db_machdep.h>
67 #include <ddb/db_sym.h>
68 #include <ddb/db_extern.h>
69 #include <sys/exec_elf.h>
70 #endif
71 
72 #include <uvm/uvm.h>
73 
74 #include <arm/arm32/machdep.h>
75 #include <arm/sa11x0/sa11x0_reg.h>
76 #include <arm/locore.h>
77 #include <arm/undefined.h>
78 
79 #include <machine/bootconfig.h>
80 #include <machine/bootinfo.h>
81 #include <machine/io.h>
82 #include <machine/platid.h>
83 #include <machine/platid_mask.h>
84 #include <machine/rtc.h>
85 #include <machine/signal.h>
86 
87 #include <dev/cons.h>
88 #include <dev/hpc/apm/apmvar.h>
89 #include <dev/hpc/bicons.h>
90 
91 /* Kernel text starts 256K in from the bottom of the kernel address space. */
92 #define	KERNEL_TEXT_BASE	(KERNEL_BASE + 0x00040000)
93 #define	KERNEL_VM_BASE		(KERNEL_BASE + 0x00C00000)
94 #define	KERNEL_VM_SIZE		0x05000000
95 
96 extern BootConfig bootconfig;		/* Boot config storage */
97 
98 extern paddr_t physical_start;
99 extern paddr_t physical_freestart;
100 extern paddr_t physical_freeend;
101 extern paddr_t physical_end;
102 
103 extern paddr_t msgbufphys;
104 
105 extern int end;
106 
107 #define	KERNEL_PT_VMEM		0	/* Page table for mapping video memory */
108 #define	KERNEL_PT_SYS		1	/* Page table for mapping proc0 zero page */
109 #define	KERNEL_PT_IO		2	/* Page table for mapping IO */
110 #define	KERNEL_PT_KERNEL	3	/* Page table for mapping kernel */
111 #define	KERNEL_PT_KERNEL_NUM	4
112 #define	KERNEL_PT_VMDATA	(KERNEL_PT_KERNEL + KERNEL_PT_KERNEL_NUM)
113 					/* Page tables for mapping kernel VM */
114 #define	KERNEL_PT_VMDATA_NUM	4	/* start with 16MB of KVM */
115 #define	NUM_KERNEL_PTS		(KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM)
116 
117 pv_addr_t kernel_pt_table[NUM_KERNEL_PTS];
118 
119 #define CPU_SA110_CACHE_CLEAN_SIZE (0x4000 * 2)
120 extern unsigned int sa1_cache_clean_addr;
121 extern unsigned int sa1_cache_clean_size;
122 static vaddr_t sa1_cc_base;
123 
124 /* Non-buffered non-cacheable memory needed to enter idle mode */
125 extern vaddr_t sa11x0_idle_mem;
126 
127 /* Prototypes */
128 void data_abort_handler(trapframe_t *);
129 void prefetch_abort_handler(trapframe_t *);
130 void undefinedinstruction_bounce(trapframe_t *);
131 u_int cpu_get_control(void);
132 
133 vaddr_t init_sa11x0(int, char **, struct bootinfo *);
134 
135 #ifdef BOOT_DUMP
136 void    dumppages(char *, int);
137 #endif
138 
139 #ifdef DEBUG_BEFOREMMU
140 static void fakecninit(void);
141 #endif
142 
143 /* Mode dependent sleep function holder */
144 extern void (*__sleep_func)(void *);
145 extern void *__sleep_ctx;
146 
147 /* Number of DRAM pages which are installed */
148 /* Units are 4K pages, so 8192 is 32 MB of memory */
149 #ifndef DRAM_PAGES
150 #define DRAM_PAGES	8192
151 #endif
152 
153 /*
154  * Static device mappings. These peripheral registers are mapped at
155  * fixed virtual addresses very early in initarm() so that we can use
156  * them while booting the kernel and stay at the same address
157  * throughout whole kernel's life time.
158  */
159 static const struct pmap_devmap sa11x0_devmap[] = {
160 	/* Physical/virtual address for UART #3. */
161 	DEVMAP_ENTRY(
162 		SACOM3_VBASE,
163 		SACOM3_BASE,
164 		0x24
165 	),
166 	DEVMAP_ENTRY_END
167 };
168 
169 /*
170  * It should be responsible for setting up everything that must be
171  * in place when main is called.
172  * This includes:
173  *   Initializing the physical console so characters can be printed.
174  *   Setting up page tables for the kernel.
175  */
176 vaddr_t
init_sa11x0(int argc,char ** argv,struct bootinfo * bi)177 init_sa11x0(int argc, char **argv, struct bootinfo *bi)
178 {
179 	u_int kerneldatasize, symbolsize;
180 	u_int l1pagetable;
181 	vaddr_t freemempos;
182 	vsize_t pt_size;
183 	int loop;
184 #if NKSYMS || defined(DDB) || defined(MODULAR)
185 	Elf_Shdr *sh;
186 #endif
187 
188 #ifdef DEBUG_BEFOREMMU
189 	/*
190 	 * At this point, we cannot call real consinit().
191 	 * Just call a faked up version of consinit(), which does the thing
192 	 * with MMU disabled.
193 	 */
194 	fakecninit();
195 #endif
196 
197 	/*
198 	 * XXX for now, overwrite bootconfig to hardcoded values.
199 	 * XXX kill bootconfig and directly call uvm_physload
200 	 */
201 	bootconfig.dram[0].address = 0xc0000000;
202 	bootconfig.dram[0].pages = DRAM_PAGES;
203 	bootconfig.dramblocks = 1;
204 
205 	kerneldatasize = (uint32_t)&end - (uint32_t)KERNEL_TEXT_BASE;
206 	symbolsize = 0;
207 #if NKSYMS || defined(DDB) || defined(MODULAR)
208 	if (!memcmp(&end, "\177ELF", 4)) {
209 /*
210  * XXXGCC12.
211  * This accesses beyond what "int end" technically supplies.
212  */
213 #pragma GCC push_options
214 #pragma GCC diagnostic ignored "-Warray-bounds"
215 		sh = (Elf_Shdr *)((char *)&end + ((Elf_Ehdr *)&end)->e_shoff);
216 #pragma GCC pop_options
217 		loop = ((Elf_Ehdr *)&end)->e_shnum;
218 		for (; loop; loop--, sh++)
219 			if (sh->sh_offset > 0 &&
220 			    (sh->sh_offset + sh->sh_size) > symbolsize)
221 				symbolsize = sh->sh_offset + sh->sh_size;
222 	}
223 #endif
224 
225 	printf("kernsize=0x%x\n", kerneldatasize);
226 	kerneldatasize += symbolsize;
227 	kerneldatasize = ((kerneldatasize - 1) & ~(PAGE_SIZE * 4 - 1)) +
228 	    PAGE_SIZE * 8;
229 
230 	/*
231 	 * hpcboot has loaded me with MMU disabled.
232 	 * So create kernel page tables and enable MMU.
233 	 */
234 
235 	/*
236 	 * Set up the variables that define the availability of physical
237 	 * memory.
238 	 */
239 	physical_start = bootconfig.dram[0].address;
240 	physical_freestart = physical_start
241 	    + (KERNEL_TEXT_BASE - KERNEL_BASE) + kerneldatasize;
242 	physical_end = bootconfig.dram[bootconfig.dramblocks - 1].address
243 	    + bootconfig.dram[bootconfig.dramblocks - 1].pages * PAGE_SIZE;
244 	physical_freeend = physical_end;
245 
246 	for (loop = 0; loop < bootconfig.dramblocks; ++loop)
247 		physmem += bootconfig.dram[loop].pages;
248 
249 	/* XXX handle UMA framebuffer memory */
250 
251 	/* Use the first 256kB to allocate things */
252 	freemempos = KERNEL_BASE;
253 	memset((void *)KERNEL_BASE, 0, KERNEL_TEXT_BASE - KERNEL_BASE);
254 
255 	/*
256 	 * Right. We have the bottom meg of memory mapped to 0x00000000
257 	 * so was can get at it. The kernel will occupy the start of it.
258 	 * After the kernel/args we allocate some of the fixed page tables
259 	 * we need to get the system going.
260 	 * We allocate one page directory and NUM_KERNEL_PTS page tables
261 	 * and store the physical addresses in the kernel_pt_table array.
262 	 * Must remember that neither the page L1 or L2 page tables are the
263 	 * same size as a page !
264 	 *
265 	 * Ok, the next bit of physical allocate may look complex but it is
266 	 * simple really. I have done it like this so that no memory gets
267 	 * wasted during the allocate of various pages and tables that are
268 	 * all different sizes.
269 	 * The start address will be page aligned.
270 	 * We allocate the kernel page directory on the first free 16KB
271 	 * boundary we find.
272 	 * We allocate the kernel page tables on the first 1KB boundary we
273 	 * find.  We allocate at least 9 PT's (12 currently).  This means
274 	 * that in the process we KNOW that we will encounter at least one
275 	 * 16KB boundary.
276 	 *
277 	 * Eventually if the top end of the memory gets used for process L1
278 	 * page tables the kernel L1 page table may be moved up there.
279 	 */
280 
281 #ifdef VERBOSE_INIT_ARM
282 	printf("Allocating page tables\n");
283 #endif
284 
285 	/* Define a macro to simplify memory allocation */
286 #define	valloc_pages(var, np)						\
287     do {								\
288 	alloc_pages((var).pv_pa, (np));					\
289 	(var).pv_va = KERNEL_BASE + (var).pv_pa - physical_start;	\
290     } while (0)
291 #define	alloc_pages(var, np)						\
292     do {								\
293 	(var) = freemempos;						\
294 	freemempos += (np) * PAGE_SIZE;					\
295 	if (freemempos > KERNEL_TEXT_BASE)				\
296 		panic("%s: out of memory", __func__);			\
297     } while (0)
298 
299 	valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
300 	for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
301 		alloc_pages(kernel_pt_table[loop].pv_pa,
302 		    L2_TABLE_SIZE / PAGE_SIZE);
303 		kernel_pt_table[loop].pv_va = kernel_pt_table[loop].pv_pa;
304 	}
305 
306 	/* This should never be able to happen but better confirm that. */
307 	if (!kernel_l1pt.pv_pa || (kernel_l1pt.pv_pa & (L1_TABLE_SIZE-1)) != 0)
308 		panic("initarm: Failed to align the kernel page directory");
309 
310 	/*
311 	 * Allocate a page for the system page mapped to V0x00000000
312 	 * This page will just contain the system vectors and can be
313 	 * shared by all processes.
314 	 */
315 	valloc_pages(systempage, 1);
316 
317 	pt_size = round_page(freemempos) - physical_start;
318 
319 	/* Allocate stacks for all modes */
320 	valloc_pages(irqstack, IRQ_STACK_SIZE);
321 	valloc_pages(abtstack, ABT_STACK_SIZE);
322 	valloc_pages(undstack, UND_STACK_SIZE);
323 	valloc_pages(kernelstack, UPAGES);
324 
325 #ifdef VERBOSE_INIT_ARM
326 	printf("IRQ stack: p0x%08lx v0x%08lx\n", irqstack.pv_pa,
327 	    irqstack.pv_va);
328 	printf("ABT stack: p0x%08lx v0x%08lx\n", abtstack.pv_pa,
329 	    abtstack.pv_va);
330 	printf("UND stack: p0x%08lx v0x%08lx\n", undstack.pv_pa,
331 	    undstack.pv_va);
332 	printf("SVC stack: p0x%08lx v0x%08lx\n", kernelstack.pv_pa,
333 	    kernelstack.pv_va);
334 #endif
335 
336 	alloc_pages(msgbufphys, round_page(MSGBUFSIZE) / PAGE_SIZE);
337 
338 	/*
339 	 * XXX Actually, we only need virtual space and don't need
340 	 * XXX physical memory for sa110_cc_base and sa11x0_idle_mem.
341 	 */
342 	/*
343 	 * XXX totally stuffed hack to work round problems introduced
344 	 * in recent versions of the pmap code. Due to the calls used there
345 	 * we cannot allocate virtual memory during bootstrap.
346 	 */
347 	for (;;) {
348 		alloc_pages(sa1_cc_base, 1);
349 		if (!(sa1_cc_base & (CPU_SA110_CACHE_CLEAN_SIZE - 1)))
350 			break;
351 	}
352 	alloc_pages(sa1_cache_clean_addr, CPU_SA110_CACHE_CLEAN_SIZE / PAGE_SIZE - 1);
353 
354 	sa1_cache_clean_addr = sa1_cc_base;
355 	sa1_cache_clean_size = CPU_SA110_CACHE_CLEAN_SIZE / 2;
356 
357 	alloc_pages(sa11x0_idle_mem, 1);
358 
359 	/*
360 	 * Ok, we have allocated physical pages for the primary kernel
361 	 * page tables.
362 	 */
363 
364 #ifdef VERBOSE_INIT_ARM
365 	printf("Creating L1 page table\n");
366 #endif
367 
368 	/*
369 	 * Now we start construction of the L1 page table.
370 	 * We start by mapping the L2 page tables into the L1.
371 	 * This means that we can replace L1 mappings later on if necessary.
372 	 */
373 	l1pagetable = kernel_l1pt.pv_pa;
374 
375 	/* Map the L2 pages tables in the L1 page table */
376 	pmap_link_l2pt(l1pagetable, 0x00000000,
377 	    &kernel_pt_table[KERNEL_PT_SYS]);
378 #define SAIPIO_BASE		0xd0000000		/* XXX XXX */
379 	pmap_link_l2pt(l1pagetable, SAIPIO_BASE,
380 	    &kernel_pt_table[KERNEL_PT_IO]);
381 	for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; ++loop)
382 		pmap_link_l2pt(l1pagetable, KERNEL_BASE + loop * 0x00400000,
383 		    &kernel_pt_table[KERNEL_PT_KERNEL + loop]);
384 	for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; ++loop)
385 		pmap_link_l2pt(l1pagetable, KERNEL_VM_BASE + loop * 0x00400000,
386 		    &kernel_pt_table[KERNEL_PT_VMDATA + loop]);
387 
388 	/* update the top of the kernel VM */
389 	pmap_curmaxkvaddr =
390 	    KERNEL_VM_BASE + (KERNEL_PT_VMDATA_NUM * 0x00400000);
391 
392 #ifdef VERBOSE_INIT_ARM
393 	printf("Mapping kernel\n");
394 #endif
395 
396 	/* Now we fill in the L2 pagetable for the kernel code/data */
397 
398 	/*
399 	 * XXX there is no ELF header to find RO region.
400 	 * XXX What should we do?
401 	 */
402 #if 0
403 	if (N_GETMAGIC(kernexec[0]) == ZMAGIC) {
404 		logical = pmap_map_chunk(l1pagetable, KERNEL_TEXT_BASE,
405 		    physical_start, kernexec->a_text,
406 		    VM_PROT_READ, PTE_CACHE);
407 		logical += pmap_map_chunk(l1pagetable,
408 		    KERNEL_TEXT_BASE + logical, physical_start + logical,
409 		    kerneldatasize - kernexec->a_text,
410 		    VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
411 	} else
412 #endif
413 		pmap_map_chunk(l1pagetable, KERNEL_TEXT_BASE,
414 		    KERNEL_TEXT_BASE - KERNEL_BASE + physical_start,
415 		    kerneldatasize, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
416 
417 #ifdef VERBOSE_INIT_ARM
418 	printf("Constructing L2 page tables\n");
419 #endif
420 
421 	/* Map the stack pages */
422 	pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa,
423 	    IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
424 	pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa,
425 	    ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
426 	pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa,
427 	    UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
428 	pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa,
429 	    UPAGES * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
430 
431 	pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
432 	    L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
433 
434 	/* Map page tables */
435 	pmap_map_chunk(l1pagetable, KERNEL_BASE, physical_start, pt_size,
436 	    VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
437 
438 	/* Map a page for entering idle mode */
439 	pmap_map_entry(l1pagetable, sa11x0_idle_mem, sa11x0_idle_mem,
440 	    VM_PROT_READ|VM_PROT_WRITE, PTE_NOCACHE);
441 
442 	/* Map the vector page. */
443 	pmap_map_entry(l1pagetable, vector_page, systempage.pv_pa,
444 	    VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
445 
446 	/* Map the statically mapped devices. */
447 	pmap_devmap_bootstrap(l1pagetable, sa11x0_devmap);
448 
449 	pmap_map_chunk(l1pagetable, sa1_cache_clean_addr, 0xe0000000,
450 	    CPU_SA110_CACHE_CLEAN_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
451 
452 	/*
453 	 * Now we have the real page tables in place so we can switch to them.
454 	 * Once this is done we will be running with the REAL kernel page
455 	 * tables.
456 	 */
457 
458 #ifdef VERBOSE_INIT_ARM
459 	printf("done.\n");
460 #endif
461 
462 	/*
463 	 * Pages were allocated during the secondary bootstrap for the
464 	 * stacks for different CPU modes.
465 	 * We must now set the r13 registers in the different CPU modes to
466 	 * point to these stacks.
467 	 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
468 	 * of the stack memory.
469 	 */
470 #ifdef VERBOSE_INIT_ARM
471 	printf("init subsystems: stacks ");
472 #endif
473 
474 	set_stackptr(PSR_IRQ32_MODE,
475 	    irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
476 	set_stackptr(PSR_ABT32_MODE,
477 	    abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
478 	set_stackptr(PSR_UND32_MODE,
479 	    undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
480 #ifdef VERBOSE_INIT_ARM
481 	printf("kstack V%08lx P%08lx\n", kernelstack.pv_va,
482 	    kernelstack.pv_pa);
483 #endif /* VERBOSE_INIT_ARM */
484 
485 	/*
486 	 * Well we should set a data abort handler.
487 	 * Once things get going this will change as we will need a proper
488 	 * handler. Until then we will use a handler that just panics but
489 	 * tells us why.
490 	 * Initialization of the vectors will just panic on a data abort.
491 	 * This just fills in a slightly better one.
492 	 */
493 #ifdef VERBOSE_INIT_ARM
494 	printf("vectors ");
495 #endif
496 	data_abort_handler_address = (u_int)data_abort_handler;
497 	prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
498 	undefined_handler_address = (u_int)undefinedinstruction_bounce;
499 #ifdef DEBUG
500 	printf("%08x %08x %08x\n", data_abort_handler_address,
501 	    prefetch_abort_handler_address, undefined_handler_address);
502 #endif
503 
504 	/* Initialize the undefined instruction handlers */
505 #ifdef VERBOSE_INIT_ARM
506 	printf("undefined\n");
507 #endif
508 	undefined_init();
509 
510 	/* Set the page table address. */
511 #ifdef VERBOSE_INIT_ARM
512 	printf("switching to new L1 page table  @%#lx...\n", kernel_l1pt.pv_pa);
513 #endif
514 	cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
515 	cpu_setttb(kernel_l1pt.pv_pa, true);
516 	cpu_tlb_flushID();
517 	cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
518 
519 	/*
520 	 * Moved from cpu_startup() as data_abort_handler() references
521 	 * this during uvm init.
522 	 */
523 	uvm_lwp_setuarea(&lwp0, kernelstack.pv_va);
524 
525 #ifdef BOOT_DUMP
526 	dumppages((char *)0xc0000000, 16 * PAGE_SIZE);
527 	dumppages((char *)0xb0100000, 64); /* XXX */
528 #endif
529 	/* Enable MMU, I-cache, D-cache, write buffer. */
530 	cpufunc_control(0x337f, 0x107d);
531 
532 	arm32_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL);
533 
534 	consinit();
535 
536 #ifdef VERBOSE_INIT_ARM
537 	printf("bootstrap done.\n");
538 #endif
539 
540 #ifdef VERBOSE_INIT_ARM
541 	printf("freemempos=%08lx\n", freemempos);
542 	printf("MMU enabled. control=%08x\n", cpu_get_control());
543 #endif
544 
545 	/* Load memory into UVM. */
546 	uvm_md_init();
547 	for (loop = 0; loop < bootconfig.dramblocks; loop++) {
548 		paddr_t dblk_start = (paddr_t)bootconfig.dram[loop].address;
549 		paddr_t dblk_end = dblk_start
550 			+ (bootconfig.dram[loop].pages * PAGE_SIZE);
551 
552 		if (dblk_start < physical_freestart)
553 			dblk_start = physical_freestart;
554 		if (dblk_end > physical_freeend)
555 			dblk_end = physical_freeend;
556 
557 		uvm_page_physload(atop(dblk_start), atop(dblk_end),
558 		    atop(dblk_start), atop(dblk_end), VM_FREELIST_DEFAULT);
559 	}
560 
561 	/* Boot strap pmap telling it where managed kernel virtual memory is */
562 	pmap_bootstrap(KERNEL_VM_BASE, KERNEL_VM_BASE + KERNEL_VM_SIZE);
563 
564 #ifdef BOOT_DUMP
565 	dumppages((char *)kernel_l1pt.pv_va, 16);
566 #endif
567 
568 #ifdef DDB
569 	db_machine_init();
570 #endif
571 #if NKSYMS || defined(DDB) || defined(MODULAR)
572 	ksyms_addsyms_elf(symbolsize, ((int *)&end), ((char *)&end) + symbolsize);
573 #endif
574 
575 	printf("kernsize=0x%x", kerneldatasize);
576 	printf(" (including 0x%x symbols)\n", symbolsize);
577 
578 #ifdef DDB
579 	if (boothowto & RB_KDB)
580 		Debugger();
581 #endif /* DDB */
582 
583 	/* We return the new stack pointer address */
584 	return kernelstack.pv_va + USPACE_SVC_STACK_TOP;
585 }
586 
587 void
consinit(void)588 consinit(void)
589 {
590 	static int consinit_called = 0;
591 
592 	if (consinit_called != 0)
593 		return;
594 
595 	consinit_called = 1;
596 	if (bootinfo->bi_cnuse == BI_CNUSE_SERIAL) {
597 		cninit();
598 	}
599 }
600 
601 #ifdef DEBUG_BEFOREMMU
602 cons_decl(sacom);
603 
604 static void
fakecninit(void)605 fakecninit(void)
606 {
607 	static struct consdev fakecntab = cons_init(sacom);
608 	cn_tab = &fakecntab;
609 
610 	(*cn_tab->cn_init)(0);
611 	cn_tab->cn_pri = CN_REMOTE;
612 }
613 #endif
614