setup_mm.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  linux/arch/m68k/kernel/setup.c
  4 *
  5 *  Copyright (C) 1995  Hamish Macdonald
  6 */
  7
  8/*
  9 * This file handles the architecture-dependent parts of system setup
 10 */
 11
 12#include <linux/kernel.h>
 13#include <linux/cpu.h>
 14#include <linux/mm.h>
 15#include <linux/sched.h>
 16#include <linux/delay.h>
 17#include <linux/interrupt.h>
 18#include <linux/fs.h>
 19#include <linux/console.h>
 20#include <linux/errno.h>
 21#include <linux/string.h>
 22#include <linux/init.h>
 23#include <linux/memblock.h>
 24#include <linux/proc_fs.h>
 25#include <linux/seq_file.h>
 26#include <linux/module.h>
 27#include <linux/nvram.h>
 28#include <linux/initrd.h>
 29#include <linux/random.h>
 30
 31#include <asm/bootinfo.h>
 32#include <asm/byteorder.h>
 33#include <asm/sections.h>
 34#include <asm/setup.h>
 35#include <asm/fpu.h>
 36#include <asm/irq.h>
 37#include <asm/io.h>
 38#include <asm/machdep.h>
 39#ifdef CONFIG_AMIGA
 40#include <asm/amigahw.h>
 41#endif
 42#include <asm/atarihw.h>
 43#ifdef CONFIG_ATARI
 44#include <asm/atari_stram.h>
 45#endif
 46#ifdef CONFIG_SUN3X
 47#include <asm/dvma.h>
 48#endif
 49#include <asm/macintosh.h>
 50#include <asm/natfeat.h>
 51#include <asm/config.h>
 52
 53#if !FPSTATESIZE || !NR_IRQS
 54#warning No CPU/platform type selected, your kernel will not work!
 55#warning Are you building an allnoconfig kernel?
 56#endif
 57
 58unsigned long m68k_machtype;
 59EXPORT_SYMBOL(m68k_machtype);
 60unsigned long m68k_cputype;
 61EXPORT_SYMBOL(m68k_cputype);
 62unsigned long m68k_fputype;
 63unsigned long m68k_mmutype;
 64EXPORT_SYMBOL(m68k_mmutype);
 65#ifdef CONFIG_VME
 66unsigned long vme_brdtype;
 67EXPORT_SYMBOL(vme_brdtype);
 68#endif
 69
 70int m68k_is040or060;
 71EXPORT_SYMBOL(m68k_is040or060);
 72
 73extern unsigned long availmem;
 74
 75int m68k_num_memory;
 76EXPORT_SYMBOL(m68k_num_memory);
 77int m68k_realnum_memory;
 78EXPORT_SYMBOL(m68k_realnum_memory);
 79unsigned long m68k_memoffset;
 80struct m68k_mem_info m68k_memory[NUM_MEMINFO];
 81EXPORT_SYMBOL(m68k_memory);
 82
 83static struct m68k_mem_info m68k_ramdisk __initdata;
 84
 85static char m68k_command_line[CL_SIZE] __initdata;
 86
 87void (*mach_sched_init) (void) __initdata = NULL;
 88/* machine dependent irq functions */
 89void (*mach_init_IRQ) (void) __initdata = NULL;
 90void (*mach_get_model) (char *model);
 91void (*mach_get_hardware_list) (struct seq_file *m);
 92void (*mach_reset)( void );
 93void (*mach_halt)( void );
 94#ifdef CONFIG_HEARTBEAT
 95void (*mach_heartbeat) (int);
 96EXPORT_SYMBOL(mach_heartbeat);
 97#endif
 98#ifdef CONFIG_M68K_L2_CACHE
 99void (*mach_l2_flush) (int);
100#endif
101#if defined(CONFIG_ISA) && defined(MULTI_ISA)
102int isa_type;
103int isa_sex;
104EXPORT_SYMBOL(isa_type);
105EXPORT_SYMBOL(isa_sex);
106#endif
107
108#define MASK_256K 0xfffc0000
109
110static void __init m68k_parse_bootinfo(const struct bi_record *record)
111{
112	const struct bi_record *first_record = record;
113	uint16_t tag;
114
115	while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
116		int unknown = 0;
117		const void *data = record->data;
118		uint16_t size = be16_to_cpu(record->size);
119
120		switch (tag) {
121		case BI_MACHTYPE:
122		case BI_CPUTYPE:
123		case BI_FPUTYPE:
124		case BI_MMUTYPE:
125			/* Already set up by head.S */
126			break;
127
128		case BI_MEMCHUNK:
129			if (m68k_num_memory < NUM_MEMINFO) {
130				const struct mem_info *m = data;
131				m68k_memory[m68k_num_memory].addr =
132					be32_to_cpu(m->addr);
133				m68k_memory[m68k_num_memory].size =
134					be32_to_cpu(m->size);
135				m68k_num_memory++;
136			} else
137				pr_warn("%s: too many memory chunks\n",
138					__func__);
139			break;
140
141		case BI_RAMDISK:
142			{
143				const struct mem_info *m = data;
144				m68k_ramdisk.addr = be32_to_cpu(m->addr);
145				m68k_ramdisk.size = be32_to_cpu(m->size);
146			}
147			break;
148
149		case BI_COMMAND_LINE:
150			strscpy(m68k_command_line, data);
151			break;
152
153		case BI_RNG_SEED: {
154			u16 len = be16_to_cpup(data);
155			add_bootloader_randomness(data + 2, len);
156			/*
157			 * Zero the data to preserve forward secrecy, and zero the
158			 * length to prevent kexec from using it.
159			 */
160			memzero_explicit((void *)data, len + 2);
161			break;
162		}
163
164		default:
165			if (MACH_IS_AMIGA)
166				unknown = amiga_parse_bootinfo(record);
167			else if (MACH_IS_ATARI)
168				unknown = atari_parse_bootinfo(record);
169			else if (MACH_IS_MAC)
170				unknown = mac_parse_bootinfo(record);
171			else if (MACH_IS_Q40)
172				unknown = q40_parse_bootinfo(record);
173			else if (MACH_IS_BVME6000)
174				unknown = bvme6000_parse_bootinfo(record);
175			else if (MACH_IS_MVME16x)
176				unknown = mvme16x_parse_bootinfo(record);
177			else if (MACH_IS_MVME147)
178				unknown = mvme147_parse_bootinfo(record);
179			else if (MACH_IS_HP300)
180				unknown = hp300_parse_bootinfo(record);
181			else if (MACH_IS_APOLLO)
182				unknown = apollo_parse_bootinfo(record);
183			else if (MACH_IS_VIRT)
184				unknown = virt_parse_bootinfo(record);
185			else
186				unknown = 1;
187		}
188		if (unknown)
189			pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
190				tag);
191		record = (struct bi_record *)((unsigned long)record + size);
192	}
193
194	save_bootinfo(first_record);
195
196	m68k_realnum_memory = m68k_num_memory;
197#ifdef CONFIG_SINGLE_MEMORY_CHUNK
198	if (m68k_num_memory > 1) {
199		pr_warn("%s: ignoring last %i chunks of physical memory\n",
200			__func__, (m68k_num_memory - 1));
201		m68k_num_memory = 1;
202	}
203#endif
204}
205
206void __init setup_arch(char **cmdline_p)
207{
208	/* The bootinfo is located right after the kernel */
209	if (!CPU_IS_COLDFIRE)
210		m68k_parse_bootinfo((const struct bi_record *)_end);
211
212	if (CPU_IS_040)
213		m68k_is040or060 = 4;
214	else if (CPU_IS_060)
215		m68k_is040or060 = 6;
216
217	/* FIXME: m68k_fputype is passed in by Penguin booter, which can
218	 * be confused by software FPU emulation. BEWARE.
219	 * We should really do our own FPU check at startup.
220	 * [what do we do with buggy 68LC040s? if we have problems
221	 *  with them, we should add a test to check_bugs() below] */
222#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
223	/* clear the fpu if we have one */
224	if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
225		volatile int zero = 0;
226		asm volatile ("frestore %0" : : "m" (zero));
227	}
228#endif
229
230	if (CPU_IS_060) {
231		u32 pcr;
232
233		asm (".chip 68060; movec %%pcr,%0; .chip 68k"
234		     : "=d" (pcr));
235		if (((pcr >> 8) & 0xff) <= 5) {
236			pr_warn("Enabling workaround for errata I14\n");
237			asm (".chip 68060; movec %0,%%pcr; .chip 68k"
238			     : : "d" (pcr | 0x20));
239		}
240	}
241
242	setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
243
244#if defined(CONFIG_BOOTPARAM)
245	strscpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
246#endif /* CONFIG_BOOTPARAM */
247	process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
248	*cmdline_p = m68k_command_line;
249	memcpy(boot_command_line, *cmdline_p, CL_SIZE);
250	/*
251	 * Initialise the static keys early as they may be enabled by the
252	 * cpufeature code and early parameters.
253	 */
254	jump_label_init();
255	parse_early_param();
256
257	switch (m68k_machtype) {
258#ifdef CONFIG_AMIGA
259	case MACH_AMIGA:
260		config_amiga();
261		break;
262#endif
263#ifdef CONFIG_ATARI
264	case MACH_ATARI:
265		config_atari();
266		break;
267#endif
268#ifdef CONFIG_MAC
269	case MACH_MAC:
270		config_mac();
271		break;
272#endif
273#ifdef CONFIG_SUN3
274	case MACH_SUN3:
275		config_sun3();
276		break;
277#endif
278#ifdef CONFIG_APOLLO
279	case MACH_APOLLO:
280		config_apollo();
281		break;
282#endif
283#ifdef CONFIG_MVME147
284	case MACH_MVME147:
285		config_mvme147();
286		break;
287#endif
288#ifdef CONFIG_MVME16x
289	case MACH_MVME16x:
290		config_mvme16x();
291		break;
292#endif
293#ifdef CONFIG_BVME6000
294	case MACH_BVME6000:
295		config_bvme6000();
296		break;
297#endif
298#ifdef CONFIG_HP300
299	case MACH_HP300:
300		config_hp300();
301		break;
302#endif
303#ifdef CONFIG_Q40
304	case MACH_Q40:
305		config_q40();
306		break;
307#endif
308#ifdef CONFIG_SUN3X
309	case MACH_SUN3X:
310		config_sun3x();
311		break;
312#endif
313#ifdef CONFIG_COLDFIRE
314	case MACH_M54XX:
315	case MACH_M5441X:
316		cf_bootmem_alloc();
317		cf_mmu_context_init();
318		config_BSP(NULL, 0);
319		break;
320#endif
321#ifdef CONFIG_VIRT
322	case MACH_VIRT:
323		config_virt();
324		break;
325#endif
326	default:
327		panic("No configuration setup");
328	}
329
330	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size)
331		memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
332
333	paging_init();
334
335	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) {
336		initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
337		initrd_end = initrd_start + m68k_ramdisk.size;
338		pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
339	}
340
341#ifdef CONFIG_NATFEAT
342	nf_init();
343#endif
344
345#ifdef CONFIG_ATARI
346	if (MACH_IS_ATARI)
347		atari_stram_reserve_pages((void *)availmem);
348#endif
349#ifdef CONFIG_SUN3X
350	if (MACH_IS_SUN3X) {
351		dvma_init();
352	}
353#endif
354
355/* set ISA defs early as possible */
356#if defined(CONFIG_ISA) && defined(MULTI_ISA)
357	if (MACH_IS_Q40) {
358		isa_type = ISA_TYPE_Q40;
359		isa_sex = 0;
360	}
361#ifdef CONFIG_AMIGA_PCMCIA
362	if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
363		isa_type = ISA_TYPE_AG;
364		isa_sex = 1;
365	}
366#endif
367#ifdef CONFIG_ATARI_ROM_ISA
368	if (MACH_IS_ATARI) {
369		isa_type = ISA_TYPE_ENEC;
370		isa_sex = 0;
371	}
372#endif
373#endif
374}
375
376static int show_cpuinfo(struct seq_file *m, void *v)
377{
378	const char *cpu, *mmu, *fpu;
379	unsigned long clockfreq, clockfactor;
380
381#define LOOP_CYCLES_68020	(8)
382#define LOOP_CYCLES_68030	(8)
383#define LOOP_CYCLES_68040	(3)
384#define LOOP_CYCLES_68060	(1)
385#define LOOP_CYCLES_COLDFIRE	(2)
386
387	if (CPU_IS_020) {
388		cpu = "68020";
389		clockfactor = LOOP_CYCLES_68020;
390	} else if (CPU_IS_030) {
391		cpu = "68030";
392		clockfactor = LOOP_CYCLES_68030;
393	} else if (CPU_IS_040) {
394		cpu = "68040";
395		clockfactor = LOOP_CYCLES_68040;
396	} else if (CPU_IS_060) {
397		cpu = "68060";
398		clockfactor = LOOP_CYCLES_68060;
399	} else if (CPU_IS_COLDFIRE) {
400		cpu = "ColdFire";
401		clockfactor = LOOP_CYCLES_COLDFIRE;
402	} else {
403		cpu = "680x0";
404		clockfactor = 0;
405	}
406
407#ifdef CONFIG_M68KFPU_EMU_ONLY
408	fpu = "none(soft float)";
409#else
410	if (m68k_fputype & FPU_68881)
411		fpu = "68881";
412	else if (m68k_fputype & FPU_68882)
413		fpu = "68882";
414	else if (m68k_fputype & FPU_68040)
415		fpu = "68040";
416	else if (m68k_fputype & FPU_68060)
417		fpu = "68060";
418	else if (m68k_fputype & FPU_SUNFPA)
419		fpu = "Sun FPA";
420	else if (m68k_fputype & FPU_COLDFIRE)
421		fpu = "ColdFire";
422	else
423		fpu = "none";
424#endif
425
426	if (m68k_mmutype & MMU_68851)
427		mmu = "68851";
428	else if (m68k_mmutype & MMU_68030)
429		mmu = "68030";
430	else if (m68k_mmutype & MMU_68040)
431		mmu = "68040";
432	else if (m68k_mmutype & MMU_68060)
433		mmu = "68060";
434	else if (m68k_mmutype & MMU_SUN3)
435		mmu = "Sun-3";
436	else if (m68k_mmutype & MMU_APOLLO)
437		mmu = "Apollo";
438	else if (m68k_mmutype & MMU_COLDFIRE)
439		mmu = "ColdFire";
440	else
441		mmu = "unknown";
442
443	clockfreq = loops_per_jiffy * HZ * clockfactor;
444
445	seq_printf(m, "CPU:\t\t%s\n"
446		   "MMU:\t\t%s\n"
447		   "FPU:\t\t%s\n"
448		   "Clocking:\t%lu.%1luMHz\n"
449		   "BogoMips:\t%lu.%02lu\n"
450		   "Calibration:\t%lu loops\n",
451		   cpu, mmu, fpu,
452		   clockfreq/1000000,(clockfreq/100000)%10,
453		   loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
454		   loops_per_jiffy);
455	return 0;
456}
457
458static void *c_start(struct seq_file *m, loff_t *pos)
459{
460	return *pos < 1 ? (void *)1 : NULL;
461}
462static void *c_next(struct seq_file *m, void *v, loff_t *pos)
463{
464	++*pos;
465	return NULL;
466}
467static void c_stop(struct seq_file *m, void *v)
468{
469}
470const struct seq_operations cpuinfo_op = {
471	.start	= c_start,
472	.next	= c_next,
473	.stop	= c_stop,
474	.show	= show_cpuinfo,
475};
476
477#ifdef CONFIG_PROC_HARDWARE
478static int hardware_proc_show(struct seq_file *m, void *v)
479{
480	char model[80];
481	unsigned long mem;
482	int i;
483
484	if (mach_get_model)
485		mach_get_model(model);
486	else
487		strscpy(model, "Unknown m68k");
488
489	seq_printf(m, "Model:\t\t%s\n", model);
490	for (mem = 0, i = 0; i < m68k_num_memory; i++)
491		mem += m68k_memory[i].size;
492	seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
493
494	if (mach_get_hardware_list)
495		mach_get_hardware_list(m);
496
497	return 0;
498}
499
500static int __init proc_hardware_init(void)
501{
502	proc_create_single("hardware", 0, NULL, hardware_proc_show);
503	return 0;
504}
505module_init(proc_hardware_init);
506#endif
507
508void __init arch_cpu_finalize_init(void)
509{
510#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
511	if (m68k_fputype == 0) {
512		pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
513			"WHICH IS REQUIRED BY LINUX/M68K ***\n");
514		pr_emerg("Upgrade your hardware or join the FPU "
515			"emulation project\n");
516		panic("no FPU");
517	}
518#endif /* !CONFIG_M68KFPU_EMU */
519}
520
521#ifdef CONFIG_ADB
522static int __init adb_probe_sync_enable (char *str) {
523	extern int __adb_probe_sync;
524	__adb_probe_sync = 1;
525	return 1;
526}
527
528__setup("adb_sync", adb_probe_sync_enable);
529#endif /* CONFIG_ADB */
530
531#if IS_ENABLED(CONFIG_NVRAM)
532#ifdef CONFIG_MAC
533static unsigned char m68k_nvram_read_byte(int addr)
534{
535	if (MACH_IS_MAC)
536		return mac_pram_read_byte(addr);
537	return 0xff;
538}
539
540static void m68k_nvram_write_byte(unsigned char val, int addr)
541{
542	if (MACH_IS_MAC)
543		mac_pram_write_byte(val, addr);
544}
545#endif /* CONFIG_MAC */
546
547#ifdef CONFIG_ATARI
548static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
549{
550	if (MACH_IS_ATARI)
551		return atari_nvram_read(buf, count, ppos);
552	else if (MACH_IS_MAC)
553		return nvram_read_bytes(buf, count, ppos);
554	return -EINVAL;
555}
556
557static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
558{
559	if (MACH_IS_ATARI)
560		return atari_nvram_write(buf, count, ppos);
561	else if (MACH_IS_MAC)
562		return nvram_write_bytes(buf, count, ppos);
563	return -EINVAL;
564}
565
566static long m68k_nvram_set_checksum(void)
567{
568	if (MACH_IS_ATARI)
569		return atari_nvram_set_checksum();
570	return -EINVAL;
571}
572
573static long m68k_nvram_initialize(void)
574{
575	if (MACH_IS_ATARI)
576		return atari_nvram_initialize();
577	return -EINVAL;
578}
579#endif /* CONFIG_ATARI */
580
581static ssize_t m68k_nvram_get_size(void)
582{
583	if (MACH_IS_ATARI)
584		return atari_nvram_get_size();
585	else if (MACH_IS_MAC)
586		return mac_pram_get_size();
587	return -ENODEV;
588}
589
590/* Atari device drivers call .read (to get checksum validation) whereas
591 * Mac and PowerMac device drivers just use .read_byte.
592 */
593const struct nvram_ops arch_nvram_ops = {
594#ifdef CONFIG_MAC
595	.read_byte      = m68k_nvram_read_byte,
596	.write_byte     = m68k_nvram_write_byte,
597#endif
598#ifdef CONFIG_ATARI
599	.read           = m68k_nvram_read,
600	.write          = m68k_nvram_write,
601	.set_checksum   = m68k_nvram_set_checksum,
602	.initialize     = m68k_nvram_initialize,
603#endif
604	.get_size       = m68k_nvram_get_size,
605};
606EXPORT_SYMBOL(arch_nvram_ops);
607#endif /* CONFIG_NVRAM */