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_at91.h"
48
49 #include <sys/cdefs.h>
50 __FBSDID("$FreeBSD$");
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_object.h>
80 #include <vm/vm_page.h>
81 #include <vm/vm_pager.h>
82 #include <vm/vm_map.h>
83 #include <vm/vnode_pager.h>
84 #include <machine/pmap.h>
85 #include <machine/vmparam.h>
86 #include <machine/pcb.h>
87 #include <machine/undefined.h>
88 #include <machine/machdep.h>
89 #include <machine/metadata.h>
90 #include <machine/armreg.h>
91 #include <machine/bus.h>
92 #include <sys/reboot.h>
93
94 #include <arm/at91/at91rm92reg.h>
95 #include <arm/at91/at91_piovar.h>
96 #include <arm/at91/at91_pio_rm9200.h>
97
98 #define KERNEL_PT_SYS 0 /* Page table for mapping proc0 zero page */
99 #define KERNEL_PT_KERN 1
100 #define KERNEL_PT_KERN_NUM 22
101 #define KERNEL_PT_AFKERNEL KERNEL_PT_KERN + KERNEL_PT_KERN_NUM /* L2 table for mapping after kernel */
102 #define KERNEL_PT_AFKERNEL_NUM 5
103
104 /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
105 #define NUM_KERNEL_PTS (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
106
107 /* Define various stack sizes in pages */
108 #define IRQ_STACK_SIZE 1
109 #define ABT_STACK_SIZE 1
110 #define UND_STACK_SIZE 1
111
112 extern u_int data_abort_handler_address;
113 extern u_int prefetch_abort_handler_address;
114 extern u_int undefined_handler_address;
115
116 struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
117
118 extern void *_end;
119
120 extern int *end;
121
122 struct pcpu __pcpu;
123 struct pcpu *pcpup = &__pcpu;
124
125 /* Physical and virtual addresses for some global pages */
126
127 vm_paddr_t phys_avail[10];
128 vm_paddr_t dump_avail[4];
129 vm_offset_t physical_pages;
130
131 struct pv_addr systempage;
132 struct pv_addr msgbufpv;
133 struct pv_addr irqstack;
134 struct pv_addr undstack;
135 struct pv_addr abtstack;
136 struct pv_addr kernelstack;
137
138 static struct trapframe proc0_tf;
139
140 /* Static device mappings. */
141 static const struct pmap_devmap kb920x_devmap[] = {
142 /*
143 * Map the on-board devices VA == PA so that we can access them
144 * with the MMU on or off.
145 */
146 {
147 /*
148 * This at least maps the interrupt controller, the UART
149 * and the timer. Other devices should use newbus to
150 * map their memory anyway.
151 */
152 0xdff00000,
153 0xfff00000,
154 0x100000,
155 VM_PROT_READ|VM_PROT_WRITE,
156 PTE_NOCACHE,
157 },
158 /*
159 * We can't just map the OHCI registers VA == PA, because
160 * AT91RM92_OHCI_BASE belongs to the userland address space.
161 * We could just choose a different virtual address, but a better
162 * solution would probably be to just use pmap_mapdev() to allocate
163 * KVA, as we don't need the OHCI controller before the vm
164 * initialization is done. However, the AT91 resource allocation
165 * system doesn't know how to use pmap_mapdev() yet.
166 */
167 #if 1
168 {
169 /*
170 * Add the ohci controller, and anything else that might be
171 * on this chip select for a VA/PA mapping.
172 */
173 AT91RM92_OHCI_BASE,
174 AT91RM92_OHCI_PA_BASE,
175 AT91RM92_OHCI_SIZE,
176 VM_PROT_READ|VM_PROT_WRITE,
177 PTE_NOCACHE,
178 },
179 #endif
180 {
181 0,
182 0,
183 0,
184 0,
185 0,
186 }
187 };
188
189 static long
190 ramsize(void)
191 {
192 uint32_t *SDRAMC = (uint32_t *)(AT91RM92_BASE + AT91RM92_SDRAMC_BASE);
193 uint32_t cr, mr;
194 int banks, rows, cols, bw;
195
196 cr = SDRAMC[AT91RM92_SDRAMC_CR / 4];
197 mr = SDRAMC[AT91RM92_SDRAMC_MR / 4];
198 bw = (mr & AT91RM92_SDRAMC_MR_DBW_16) ? 1 : 2;
199 banks = (cr & AT91RM92_SDRAMC_CR_NB_4) ? 2 : 1;
200 rows = ((cr & AT91RM92_SDRAMC_CR_NR_MASK) >> 2) + 11;
201 cols = (cr & AT91RM92_SDRAMC_CR_NC_MASK) + 8;
202 return (1 << (cols + rows + banks + bw));
203 }
204
205 static long
206 board_init(void)
207 {
208 /*
209 * Since the USART supports RS-485 multidrop mode, it allows the
210 * TX pins to float. However, for RS-232 operations, we don't want
211 * these pins to float. Instead, they should be pulled up to avoid
212 * mismatches. Linux does something similar when it configures the
213 * TX lines. This implies that we also allow the RX lines to float
214 * rather than be in the state they are left in by the boot loader.
215 * Since they are input pins, I think that this is the right thing
216 * to do.
217 */
218
219 /* PIOA's A periph: Turn USART 0 and 2's TX/RX pins */
220 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
221 AT91C_PA18_RXD0 | AT91C_PA22_RXD2, 0);
222 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
223 AT91C_PA17_TXD0 | AT91C_PA23_TXD2, 1);
224 /* PIOA's B periph: Turn USART 3's TX/RX pins */
225 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA6_RXD3, 0);
226 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA5_TXD3, 1);
227 #ifdef AT91_TSC
228 /* We're using TC0's A1 and A2 input */
229 at91_pio_use_periph_b(AT91RM92_PIOA_BASE,
230 AT91C_PA19_TIOA1 | AT91C_PA21_TIOA2, 0);
231 #endif
232 /* PIOB's A periph: Turn USART 1's TX/RX pins */
233 at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB21_RXD1, 0);
234 at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB20_TXD1, 1);
235
236 /* Pin assignment */
237 #ifdef AT91_TSC
238 /* Assert PA24 low -- talk to rubidium */
239 at91_pio_use_gpio(AT91RM92_PIOA_BASE, AT91C_PIO_PA24);
240 at91_pio_gpio_output(AT91RM92_PIOA_BASE, AT91C_PIO_PA24, 0);
241 at91_pio_gpio_clear(AT91RM92_PIOA_BASE, AT91C_PIO_PA24);
242 at91_pio_use_gpio(AT91RM92_PIOB_BASE,
243 AT91C_PIO_PB16 | AT91C_PIO_PB17 | AT91C_PIO_PB18 | AT91C_PIO_PB19);
244 #endif
245
246 return (ramsize());
247 }
248
249 void *
250 initarm(void *arg, void *arg2)
251 {
252 struct pv_addr kernel_l1pt;
253 int loop, i;
254 u_int l1pagetable;
255 vm_offset_t freemempos;
256 vm_offset_t afterkern;
257 uint32_t memsize;
258 vm_offset_t lastaddr;
259
260 set_cpufuncs();
261 lastaddr = fake_preload_metadata();
262 pcpu_init(pcpup, 0, sizeof(struct pcpu));
263 PCPU_SET(curthread, &thread0);
264
265 #define KERNEL_TEXT_BASE (KERNBASE)
266 freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK;
267 /* Define a macro to simplify memory allocation */
268 #define valloc_pages(var, np) \
269 alloc_pages((var).pv_va, (np)); \
270 (var).pv_pa = (var).pv_va + (KERNPHYSADDR - KERNVIRTADDR);
271
272 #define alloc_pages(var, np) \
273 (var) = freemempos; \
274 freemempos += (np * PAGE_SIZE); \
275 memset((char *)(var), 0, ((np) * PAGE_SIZE));
276
277 while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
278 freemempos += PAGE_SIZE;
279 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
280 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
281 if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
282 valloc_pages(kernel_pt_table[loop],
283 L2_TABLE_SIZE / PAGE_SIZE);
284 } else {
285 kernel_pt_table[loop].pv_va = freemempos -
286 (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
287 L2_TABLE_SIZE_REAL;
288 kernel_pt_table[loop].pv_pa =
289 kernel_pt_table[loop].pv_va - KERNVIRTADDR +
290 KERNPHYSADDR;
291 }
292 i++;
293 }
294 /*
295 * Allocate a page for the system page mapped to V0x00000000
296 * This page will just contain the system vectors and can be
297 * shared by all processes.
298 */
299 valloc_pages(systempage, 1);
300
301 /* Allocate stacks for all modes */
302 valloc_pages(irqstack, IRQ_STACK_SIZE);
303 valloc_pages(abtstack, ABT_STACK_SIZE);
304 valloc_pages(undstack, UND_STACK_SIZE);
305 valloc_pages(kernelstack, KSTACK_PAGES);
306 valloc_pages(msgbufpv, round_page(MSGBUF_SIZE) / PAGE_SIZE);
307 /*
308 * Now we start construction of the L1 page table
309 * We start by mapping the L2 page tables into the L1.
310 * This means that we can replace L1 mappings later on if necessary
311 */
312 l1pagetable = kernel_l1pt.pv_va;
313
314 /* Map the L2 pages tables in the L1 page table */
315 pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH,
316 &kernel_pt_table[KERNEL_PT_SYS]);
317 for (i = 0; i < KERNEL_PT_KERN_NUM; i++)
318 pmap_link_l2pt(l1pagetable, KERNBASE + i * 0x100000,
319 &kernel_pt_table[KERNEL_PT_KERN + i]);
320 pmap_map_chunk(l1pagetable, KERNBASE, PHYSADDR,
321 (((uint32_t)lastaddr - KERNBASE) + PAGE_SIZE) & ~(PAGE_SIZE - 1),
322 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
323 afterkern = round_page((lastaddr + L1_S_SIZE) & ~(L1_S_SIZE
324 - 1));
325 for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
326 pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
327 &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
328 }
329
330 /* Map the vector page. */
331 pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
332 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
333 /* Map the stack pages */
334 pmap_map_chunk(l1pagetable, irqstack.pv_va, irqstack.pv_pa,
335 IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
336 pmap_map_chunk(l1pagetable, abtstack.pv_va, abtstack.pv_pa,
337 ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
338 pmap_map_chunk(l1pagetable, undstack.pv_va, undstack.pv_pa,
339 UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
340 pmap_map_chunk(l1pagetable, kernelstack.pv_va, kernelstack.pv_pa,
341 KSTACK_PAGES * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
342
343 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
344 L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
345 pmap_map_chunk(l1pagetable, msgbufpv.pv_va, msgbufpv.pv_pa,
346 MSGBUF_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
347
348
349 for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
350 pmap_map_chunk(l1pagetable, kernel_pt_table[loop].pv_va,
351 kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE,
352 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
353 }
354
355 pmap_devmap_bootstrap(l1pagetable, kb920x_devmap);
356 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
357 setttb(kernel_l1pt.pv_pa);
358 cpu_tlb_flushID();
359 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
360 cninit();
361 memsize = board_init();
362 physmem = memsize / PAGE_SIZE;
363
364 /*
365 * Pages were allocated during the secondary bootstrap for the
366 * stacks for different CPU modes.
367 * We must now set the r13 registers in the different CPU modes to
368 * point to these stacks.
369 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
370 * of the stack memory.
371 */
372
373 cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE);
374 set_stackptr(PSR_IRQ32_MODE,
375 irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
376 set_stackptr(PSR_ABT32_MODE,
377 abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
378 set_stackptr(PSR_UND32_MODE,
379 undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
380
381
382
383 /*
384 * We must now clean the cache again....
385 * Cleaning may be done by reading new data to displace any
386 * dirty data in the cache. This will have happened in setttb()
387 * but since we are boot strapping the addresses used for the read
388 * may have just been remapped and thus the cache could be out
389 * of sync. A re-clean after the switch will cure this.
390 * After booting there are no gross reloations of the kernel thus
391 * this problem will not occur after initarm().
392 */
393 cpu_idcache_wbinv_all();
394
395 /* Set stack for exception handlers */
396
397 data_abort_handler_address = (u_int)data_abort_handler;
398 prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
399 undefined_handler_address = (u_int)undefinedinstruction_bounce;
400 undefined_init();
401
402 proc_linkup0(&proc0, &thread0);
403 thread0.td_kstack = kernelstack.pv_va;
404 thread0.td_pcb = (struct pcb *)
405 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
406 thread0.td_pcb->pcb_flags = 0;
407 thread0.td_frame = &proc0_tf;
408 pcpup->pc_curpcb = thread0.td_pcb;
409
410 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
411
412 pmap_curmaxkvaddr = afterkern + 0x100000 * (KERNEL_PT_KERN_NUM - 1);
413 /*
414 * ARM_USE_SMALL_ALLOC uses dump_avail, so it must be filled before
415 * calling pmap_bootstrap.
416 */
417 dump_avail[0] = PHYSADDR;
418 dump_avail[1] = PHYSADDR + memsize;
419 dump_avail[2] = 0;
420 dump_avail[3] = 0;
421
422 pmap_bootstrap(freemempos,
423 KERNVIRTADDR + 3 * memsize,
424 &kernel_l1pt);
425 msgbufp = (void*)msgbufpv.pv_va;
426 msgbufinit(msgbufp, MSGBUF_SIZE);
427 mutex_init();
428
429 i = 0;
430
431 #if PHYSADDR != KERNPHYSADDR
432 phys_avail[i++] = PHYSADDR;
433 phys_avail[i++] = KERNPHYSADDR;
434 #endif
435 phys_avail[i++] = virtual_avail - KERNVIRTADDR + KERNPHYSADDR;
436 phys_avail[i++] = PHYSADDR + memsize;
437 phys_avail[i++] = 0;
438 phys_avail[i++] = 0;
439 /* Do basic tuning, hz etc */
440 init_param1();
441 init_param2(physmem);
442 kdb_init();
443 return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
444 sizeof(struct pcb)));
445 }
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