beri_machdep.c revision 331722 
1/*-
2 * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
3 * Copyright (c) 2012-2014 Robert N. M. Watson
4 * All rights reserved.
5 *
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
8 * ("CTSRD"), as part of the DARPA CRASH research programme.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/11/sys/mips/beri/beri_machdep.c 331722 2018-03-29 02:50:57Z eadler $");
33
34#include "opt_ddb.h"
35#include "opt_platform.h"
36
37#include <sys/param.h>
38#include <sys/conf.h>
39#include <sys/kernel.h>
40#include <sys/systm.h>
41#include <sys/imgact.h>
42#include <sys/bio.h>
43#include <sys/buf.h>
44#include <sys/bus.h>
45#include <sys/cpu.h>
46#include <sys/cons.h>
47#include <sys/exec.h>
48#include <sys/linker.h>
49#include <sys/ucontext.h>
50#include <sys/proc.h>
51#include <sys/kdb.h>
52#include <sys/ptrace.h>
53#include <sys/reboot.h>
54#include <sys/signalvar.h>
55#include <sys/sysent.h>
56#include <sys/sysproto.h>
57#include <sys/user.h>
58
59#ifdef FDT
60#include <dev/fdt/fdt_common.h>
61#include <dev/ofw/openfirm.h>
62#endif
63
64#include <vm/vm.h>
65#include <vm/vm_object.h>
66#include <vm/vm_page.h>
67
68#include <machine/bootinfo.h>
69#include <machine/clock.h>
70#include <machine/cpu.h>
71#include <machine/cpuregs.h>
72#include <machine/hwfunc.h>
73#include <machine/md_var.h>
74#include <machine/metadata.h>
75#include <machine/pmap.h>
76#include <machine/trap.h>
77
78extern int	*edata;
79extern int	*end;
80
81void
82platform_cpu_init()
83{
84	/* Nothing special */
85}
86
87static void
88mips_init(void)
89{
90	int i;
91#ifdef FDT
92	struct mem_region mr[FDT_MEM_REGIONS];
93	uint64_t val;
94	int mr_cnt;
95	int j;
96#endif
97
98	for (i = 0; i < 10; i++) {
99		phys_avail[i] = 0;
100	}
101
102	/* phys_avail regions are in bytes */
103	phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
104	phys_avail[1] = ctob(realmem);
105
106	dump_avail[0] = phys_avail[0];
107	dump_avail[1] = phys_avail[1];
108
109	physmem = realmem;
110
111#ifdef FDT
112	if (fdt_get_mem_regions(mr, &mr_cnt, &val) == 0) {
113
114		physmem = btoc(val);
115
116		KASSERT((phys_avail[0] >= mr[0].mr_start) && \
117			(phys_avail[0] < (mr[0].mr_start + mr[0].mr_size)),
118			("First region is not within FDT memory range"));
119
120		/* Limit size of the first region */
121		phys_avail[1] = (mr[0].mr_start + MIN(mr[0].mr_size, ctob(realmem)));
122		dump_avail[1] = phys_avail[1];
123
124		/* Add the rest of regions */
125		for (i = 1, j = 2; i < mr_cnt; i++, j+=2) {
126			phys_avail[j] = mr[i].mr_start;
127			phys_avail[j+1] = (mr[i].mr_start + mr[i].mr_size);
128			dump_avail[j] = phys_avail[j];
129			dump_avail[j+1] = phys_avail[j+1];
130		}
131	}
132#endif
133
134	init_param1();
135	init_param2(physmem);
136	mips_cpu_init();
137	pmap_bootstrap();
138	mips_proc0_init();
139	mutex_init();
140	kdb_init();
141#ifdef KDB
142	if (boothowto & RB_KDB)
143		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
144#endif
145}
146
147/*
148 * Perform a board-level soft-reset.
149 */
150void
151platform_reset(void)
152{
153
154	/* XXX SMP will likely require us to do more. */
155	__asm__ __volatile__(
156		"mfc0 $k0, $12\n\t"
157		"li $k1, 0x00100000\n\t"
158		"or $k0, $k0, $k1\n\t"
159		"mtc0 $k0, $12\n");
160	for( ; ; )
161		__asm__ __volatile("wait");
162}
163
164#ifdef FDT
165/* Parse cmd line args as env - copied from xlp_machdep. */
166/* XXX-BZ this should really be centrally provided for all (boot) code. */
167static void
168_parse_bootargs(char *cmdline)
169{
170	char *n, *v;
171
172	while ((v = strsep(&cmdline, " \n")) != NULL) {
173		if (*v == '\0')
174			continue;
175		if (*v == '-') {
176			while (*v != '\0') {
177				v++;
178				switch (*v) {
179				case 'a': boothowto |= RB_ASKNAME; break;
180				/* Someone should simulate that ;-) */
181				case 'C': boothowto |= RB_CDROM; break;
182				case 'd': boothowto |= RB_KDB; break;
183				case 'D': boothowto |= RB_MULTIPLE; break;
184				case 'm': boothowto |= RB_MUTE; break;
185				case 'g': boothowto |= RB_GDB; break;
186				case 'h': boothowto |= RB_SERIAL; break;
187				case 'p': boothowto |= RB_PAUSE; break;
188				case 'r': boothowto |= RB_DFLTROOT; break;
189				case 's': boothowto |= RB_SINGLE; break;
190				case 'v': boothowto |= RB_VERBOSE; break;
191				}
192			}
193		} else {
194			n = strsep(&v, "=");
195			if (v == NULL)
196				kern_setenv(n, "1");
197			else
198				kern_setenv(n, v);
199		}
200	}
201}
202#endif
203
204void
205platform_start(__register_t a0, __register_t a1,  __register_t a2,
206    __register_t a3)
207{
208	struct bootinfo *bootinfop;
209	vm_offset_t kernend;
210	uint64_t platform_counter_freq;
211	int argc = a0;
212	char **argv = (char **)a1;
213	char **envp = (char **)a2;
214	long memsize;
215#ifdef FDT
216	char buf[2048];		/* early stack supposedly big enough */
217	vm_offset_t dtbp;
218	phandle_t chosen;
219	void *kmdp;
220#endif
221	int i;
222
223	/* clear the BSS and SBSS segments */
224	kernend = (vm_offset_t)&end;
225	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
226
227	mips_postboot_fixup();
228
229	mips_pcpu0_init();
230
231	/*
232	 * Over time, we've changed out boot-time binary interface for the
233	 * kernel.  Miniboot simply provides a 'memsize' in a3, whereas the
234	 * FreeBSD boot loader provides a 'bootinfo *' in a3.  While slightly
235	 * grody, we support both here by detecting 'pointer-like' values in
236	 * a3 and assuming physical memory can never be that back.
237	 *
238	 * XXXRW: Pull more values than memsize out of bootinfop -- e.g.,
239	 * module information.
240	 */
241	if (a3 >= 0x9800000000000000ULL) {
242		bootinfop = (void *)a3;
243		memsize = bootinfop->bi_memsize;
244		preload_metadata = (caddr_t)bootinfop->bi_modulep;
245	} else {
246		bootinfop = NULL;
247		memsize = a3;
248	}
249
250#ifdef FDT
251	/*
252	 * Find the dtb passed in by the boot loader (currently fictional).
253	 */
254	kmdp = preload_search_by_type("elf kernel");
255	dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
256
257#if defined(FDT_DTB_STATIC)
258	/*
259	 * In case the device tree blob was not retrieved (from metadata) try
260	 * to use the statically embedded one.
261	 */
262	if (dtbp == (vm_offset_t)NULL)
263		dtbp = (vm_offset_t)&fdt_static_dtb;
264#else
265#error	"Non-static FDT not yet supported on BERI"
266#endif
267
268	if (OF_install(OFW_FDT, 0) == FALSE)
269		while (1);
270	if (OF_init((void *)dtbp) != 0)
271		while (1);
272
273	/*
274	 * Configure more boot-time parameters passed in by loader.
275	 */
276	boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
277	init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 0);
278
279	/*
280	 * Get bootargs from FDT if specified.
281	 */
282	chosen = OF_finddevice("/chosen");
283	if (OF_getprop(chosen, "bootargs", buf, sizeof(buf)) != -1)
284		_parse_bootargs(buf);
285#endif
286
287	/*
288	 * XXXRW: We have no way to compare wallclock time to cycle rate on
289	 * BERI, so for now assume we run at the MALTA default (100MHz).
290	 */
291	platform_counter_freq = MIPS_DEFAULT_HZ;
292	mips_timer_early_init(platform_counter_freq);
293
294	cninit();
295	printf("entry: platform_start()\n");
296
297	bootverbose = 1;
298	if (bootverbose) {
299		printf("cmd line: ");
300		for (i = 0; i < argc; i++)
301			printf("%s ", argv[i]);
302		printf("\n");
303
304		printf("envp:\n");
305		for (i = 0; envp[i]; i += 2)
306			printf("\t%s = %s\n", envp[i], envp[i+1]);
307
308		if (bootinfop != NULL)
309			printf("bootinfo found at %p\n", bootinfop);
310
311		printf("memsize = %p\n", (void *)memsize);
312	}
313
314	realmem = btoc(memsize);
315	mips_init();
316
317	mips_timer_init_params(platform_counter_freq, 0);
318}
319