/arch/mips/kernel/setup.c

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 1995 Linus Torvalds
  7 * Copyright (C) 1995 Waldorf Electronics
  8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
  9 * Copyright (C) 1996 Stoned Elipot
 10 * Copyright (C) 1999 Silicon Graphics, Inc.
 11 * Copyright (C) 2000 2001, 2002  Maciej W. Rozycki
 12 */
 13#include <linux/config.h>
 14#include <linux/errno.h>
 15#include <linux/init.h>
 16#include <linux/ioport.h>
 17#include <linux/sched.h>
 18#include <linux/kernel.h>
 19#include <linux/mm.h>
 20#include <linux/module.h>
 21#include <linux/stddef.h>
 22#include <linux/string.h>
 23#include <linux/unistd.h>
 24#include <linux/slab.h>
 25#include <linux/user.h>
 26#include <linux/utsname.h>
 27#include <linux/a.out.h>
 28#include <linux/tty.h>
 29#include <linux/bootmem.h>
 30#include <linux/initrd.h>
 31#include <linux/major.h>
 32#include <linux/kdev_t.h>
 33#include <linux/root_dev.h>
 34#include <linux/highmem.h>
 35#include <linux/console.h>
 36
 37#include <asm/addrspace.h>
 38#include <asm/bootinfo.h>
 39#include <asm/cpu.h>
 40#include <asm/sections.h>
 41#include <asm/setup.h>
 42#include <asm/system.h>
 43
 44struct cpuinfo_mips cpu_data[NR_CPUS];
 45
 46EXPORT_SYMBOL(cpu_data);
 47
 48#ifdef CONFIG_VT
 49struct screen_info screen_info;
 50#endif
 51
 52/*
 53 * Despite it's name this variable is even if we don't have PCI
 54 */
 55unsigned int PCI_DMA_BUS_IS_PHYS;
 56
 57EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
 58
 59/*
 60 * Setup information
 61 *
 62 * These are initialized so they are in the .data section
 63 */
 64unsigned long mips_machtype = MACH_UNKNOWN;
 65unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
 66
 67EXPORT_SYMBOL(mips_machtype);
 68EXPORT_SYMBOL(mips_machgroup);
 69
 70struct boot_mem_map boot_mem_map;
 71
 72static char command_line[CL_SIZE];
 73       char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
 74
 75/*
 76 * mips_io_port_base is the begin of the address space to which x86 style
 77 * I/O ports are mapped.
 78 */
 79const unsigned long mips_io_port_base = -1;
 80EXPORT_SYMBOL(mips_io_port_base);
 81
 82/*
 83 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
 84 * for the processor.
 85 */
 86unsigned long isa_slot_offset;
 87EXPORT_SYMBOL(isa_slot_offset);
 88
 89static struct resource code_resource = { .name = "Kernel code", };
 90static struct resource data_resource = { .name = "Kernel data", };
 91
 92void __init add_memory_region(phys_t start, phys_t size, long type)
 93{
 94	int x = boot_mem_map.nr_map;
 95	struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
 96
 97	/*
 98	 * Try to merge with previous entry if any.  This is far less than
 99	 * perfect but is sufficient for most real world cases.
100	 */
101	if (x && prev->addr + prev->size == start && prev->type == type) {
102		prev->size += size;
103		return;
104	}
105
106	if (x == BOOT_MEM_MAP_MAX) {
107		printk("Ooops! Too many entries in the memory map!\n");
108		return;
109	}
110
111	boot_mem_map.map[x].addr = start;
112	boot_mem_map.map[x].size = size;
113	boot_mem_map.map[x].type = type;
114	boot_mem_map.nr_map++;
115}
116
117static void __init print_memory_map(void)
118{
119	int i;
120	const int field = 2 * sizeof(unsigned long);
121
122	for (i = 0; i < boot_mem_map.nr_map; i++) {
123		printk(" memory: %0*Lx @ %0*Lx ",
124		       field, (unsigned long long) boot_mem_map.map[i].size,
125		       field, (unsigned long long) boot_mem_map.map[i].addr);
126
127		switch (boot_mem_map.map[i].type) {
128		case BOOT_MEM_RAM:
129			printk("(usable)\n");
130			break;
131		case BOOT_MEM_ROM_DATA:
132			printk("(ROM data)\n");
133			break;
134		case BOOT_MEM_RESERVED:
135			printk("(reserved)\n");
136			break;
137		default:
138			printk("type %lu\n", boot_mem_map.map[i].type);
139			break;
140		}
141	}
142}
143
144static inline void parse_cmdline_early(void)
145{
146	char c = ' ', *to = command_line, *from = saved_command_line;
147	unsigned long start_at, mem_size;
148	int len = 0;
149	int usermem = 0;
150
151	printk("Determined physical RAM map:\n");
152	print_memory_map();
153
154	for (;;) {
155		/*
156		 * "mem=XXX[kKmM]" defines a memory region from
157		 * 0 to <XXX>, overriding the determined size.
158		 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
159		 * <YYY> to <YYY>+<XXX>, overriding the determined size.
160		 */
161		if (c == ' ' && !memcmp(from, "mem=", 4)) {
162			if (to != command_line)
163				to--;
164			/*
165			 * If a user specifies memory size, we
166			 * blow away any automatically generated
167			 * size.
168			 */
169			if (usermem == 0) {
170				boot_mem_map.nr_map = 0;
171				usermem = 1;
172			}
173			mem_size = memparse(from + 4, &from);
174			if (*from == '@')
175				start_at = memparse(from + 1, &from);
176			else
177				start_at = 0;
178			add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
179		}
180		c = *(from++);
181		if (!c)
182			break;
183		if (CL_SIZE <= ++len)
184			break;
185		*(to++) = c;
186	}
187	*to = '\0';
188
189	if (usermem) {
190		printk("User-defined physical RAM map:\n");
191		print_memory_map();
192	}
193}
194
195static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
196{
197	/*
198	 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
199	 * "rd_size=0xNN" it's size
200	 */
201	unsigned long start = 0;
202	unsigned long size = 0;
203	unsigned long end;
204	char cmd_line[CL_SIZE];
205	char *start_str;
206	char *size_str;
207	char *tmp;
208
209	strcpy(cmd_line, command_line);
210	*command_line = 0;
211	tmp = cmd_line;
212	/* Ignore "rd_start=" strings in other parameters. */
213	start_str = strstr(cmd_line, "rd_start=");
214	if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
215		start_str = strstr(start_str, " rd_start=");
216	while (start_str) {
217		if (start_str != cmd_line)
218			strncat(command_line, tmp, start_str - tmp);
219		start = memparse(start_str + 9, &start_str);
220		tmp = start_str + 1;
221		start_str = strstr(start_str, " rd_start=");
222	}
223	if (*tmp)
224		strcat(command_line, tmp);
225
226	strcpy(cmd_line, command_line);
227	*command_line = 0;
228	tmp = cmd_line;
229	/* Ignore "rd_size" strings in other parameters. */
230	size_str = strstr(cmd_line, "rd_size=");
231	if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
232		size_str = strstr(size_str, " rd_size=");
233	while (size_str) {
234		if (size_str != cmd_line)
235			strncat(command_line, tmp, size_str - tmp);
236		size = memparse(size_str + 8, &size_str);
237		tmp = size_str + 1;
238		size_str = strstr(size_str, " rd_size=");
239	}
240	if (*tmp)
241		strcat(command_line, tmp);
242
243#ifdef CONFIG_MIPS64
244	/* HACK: Guess if the sign extension was forgotten */
245	if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
246		start |= 0xffffffff00000000;
247#endif
248
249	end = start + size;
250	if (start && end) {
251		*rd_start = start;
252		*rd_end = end;
253		return 1;
254	}
255	return 0;
256}
257
258#define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
259#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
260#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
261
262#define MAXMEM		HIGHMEM_START
263#define MAXMEM_PFN	PFN_DOWN(MAXMEM)
264
265static inline void bootmem_init(void)
266{
267	unsigned long start_pfn;
268	unsigned long reserved_end = (unsigned long)&_end;
269#ifndef CONFIG_SGI_IP27
270	unsigned long first_usable_pfn;
271	unsigned long bootmap_size;
272	int i;
273#endif
274#ifdef CONFIG_BLK_DEV_INITRD
275	int initrd_reserve_bootmem = 0;
276
277	/* Board specific code should have set up initrd_start and initrd_end */
278 	ROOT_DEV = Root_RAM0;
279	if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
280		reserved_end = max(reserved_end, initrd_end);
281		initrd_reserve_bootmem = 1;
282	} else {
283		unsigned long tmp;
284		u32 *initrd_header;
285
286		tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
287		if (tmp < reserved_end)
288			tmp += PAGE_SIZE;
289		initrd_header = (u32 *)tmp;
290		if (initrd_header[0] == 0x494E5244) {
291			initrd_start = (unsigned long)&initrd_header[2];
292			initrd_end = initrd_start + initrd_header[1];
293			reserved_end = max(reserved_end, initrd_end);
294			initrd_reserve_bootmem = 1;
295		}
296	}
297#endif	/* CONFIG_BLK_DEV_INITRD */
298
299	/*
300	 * Partially used pages are not usable - thus
301	 * we are rounding upwards.
302	 */
303	start_pfn = PFN_UP(CPHYSADDR(reserved_end));
304
305#ifndef CONFIG_SGI_IP27
306	/* Find the highest page frame number we have available.  */
307	max_pfn = 0;
308	first_usable_pfn = -1UL;
309	for (i = 0; i < boot_mem_map.nr_map; i++) {
310		unsigned long start, end;
311
312		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
313			continue;
314
315		start = PFN_UP(boot_mem_map.map[i].addr);
316		end = PFN_DOWN(boot_mem_map.map[i].addr
317		      + boot_mem_map.map[i].size);
318
319		if (start >= end)
320			continue;
321		if (end > max_pfn)
322			max_pfn = end;
323		if (start < first_usable_pfn) {
324			if (start > start_pfn) {
325				first_usable_pfn = start;
326			} else if (end > start_pfn) {
327				first_usable_pfn = start_pfn;
328			}
329		}
330	}
331
332	/*
333	 * Determine low and high memory ranges
334	 */
335	max_low_pfn = max_pfn;
336	if (max_low_pfn > MAXMEM_PFN) {
337		max_low_pfn = MAXMEM_PFN;
338#ifndef CONFIG_HIGHMEM
339		/* Maximum memory usable is what is directly addressable */
340		printk(KERN_WARNING "Warning only %ldMB will be used.\n",
341		       MAXMEM >> 20);
342		printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
343#endif
344	}
345
346#ifdef CONFIG_HIGHMEM
347	/*
348	 * Crude, we really should make a better attempt at detecting
349	 * highstart_pfn
350	 */
351	highstart_pfn = highend_pfn = max_pfn;
352	if (max_pfn > MAXMEM_PFN) {
353		highstart_pfn = MAXMEM_PFN;
354		printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
355		       (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
356	}
357#endif
358
359	/* Initialize the boot-time allocator with low memory only.  */
360	bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
361
362	/*
363	 * Register fully available low RAM pages with the bootmem allocator.
364	 */
365	for (i = 0; i < boot_mem_map.nr_map; i++) {
366		unsigned long curr_pfn, last_pfn, size;
367
368		/*
369		 * Reserve usable memory.
370		 */
371		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
372			continue;
373
374		/*
375		 * We are rounding up the start address of usable memory:
376		 */
377		curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
378		if (curr_pfn >= max_low_pfn)
379			continue;
380		if (curr_pfn < start_pfn)
381			curr_pfn = start_pfn;
382
383		/*
384		 * ... and at the end of the usable range downwards:
385		 */
386		last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
387				    + boot_mem_map.map[i].size);
388
389		if (last_pfn > max_low_pfn)
390			last_pfn = max_low_pfn;
391
392		/*
393		 * Only register lowmem part of lowmem segment with bootmem.
394		 */
395		size = last_pfn - curr_pfn;
396		if (curr_pfn > PFN_DOWN(HIGHMEM_START))
397			continue;
398		if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
399			size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
400		if (!size)
401			continue;
402
403		/*
404		 * ... finally, did all the rounding and playing
405		 * around just make the area go away?
406		 */
407		if (last_pfn <= curr_pfn)
408			continue;
409
410		/* Register lowmem ranges */
411		free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
412	}
413
414	/* Reserve the bootmap memory.  */
415	reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
416#endif /* CONFIG_SGI_IP27 */
417
418#ifdef CONFIG_BLK_DEV_INITRD
419	initrd_below_start_ok = 1;
420	if (initrd_start) {
421		unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
422		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
423		       (void *)initrd_start, initrd_size);
424
425		if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
426			printk("initrd extends beyond end of memory "
427			       "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
428			       sizeof(long) * 2,
429			       (unsigned long long)CPHYSADDR(initrd_end),
430			       sizeof(long) * 2,
431			       (unsigned long long)PFN_PHYS(max_low_pfn));
432			initrd_start = initrd_end = 0;
433			initrd_reserve_bootmem = 0;
434		}
435
436		if (initrd_reserve_bootmem)
437			reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
438	}
439#endif /* CONFIG_BLK_DEV_INITRD  */
440}
441
442static inline void resource_init(void)
443{
444	int i;
445
446#if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
447	/*
448	 * The 64bit code in 32bit object format trick can't represent
449	 * 64bit wide relocations for linker script symbols.
450	 */
451	code_resource.start = CPHYSADDR(&_text);
452	code_resource.end = CPHYSADDR(&_etext) - 1;
453	data_resource.start = CPHYSADDR(&_etext);
454	data_resource.end = CPHYSADDR(&_edata) - 1;
455#else
456	code_resource.start = virt_to_phys(&_text);
457	code_resource.end = virt_to_phys(&_etext) - 1;
458	data_resource.start = virt_to_phys(&_etext);
459	data_resource.end = virt_to_phys(&_edata) - 1;
460#endif
461
462	/*
463	 * Request address space for all standard RAM.
464	 */
465	for (i = 0; i < boot_mem_map.nr_map; i++) {
466		struct resource *res;
467		unsigned long start, end;
468
469		start = boot_mem_map.map[i].addr;
470		end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
471		if (start >= MAXMEM)
472			continue;
473		if (end >= MAXMEM)
474			end = MAXMEM - 1;
475
476		res = alloc_bootmem(sizeof(struct resource));
477		switch (boot_mem_map.map[i].type) {
478		case BOOT_MEM_RAM:
479		case BOOT_MEM_ROM_DATA:
480			res->name = "System RAM";
481			break;
482		case BOOT_MEM_RESERVED:
483		default:
484			res->name = "reserved";
485		}
486
487		res->start = start;
488		res->end = end;
489
490		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
491		request_resource(&iomem_resource, res);
492
493		/*
494		 *  We don't know which RAM region contains kernel data,
495		 *  so we try it repeatedly and let the resource manager
496		 *  test it.
497		 */
498		request_resource(res, &code_resource);
499		request_resource(res, &data_resource);
500	}
501}
502
503#undef PFN_UP
504#undef PFN_DOWN
505#undef PFN_PHYS
506
507#undef MAXMEM
508#undef MAXMEM_PFN
509
510static int __initdata earlyinit_debug;
511
512static int __init earlyinit_debug_setup(char *str)
513{
514	earlyinit_debug = 1;
515	return 1;
516}
517__setup("earlyinit_debug", earlyinit_debug_setup);
518
519extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
520
521static void __init do_earlyinitcalls(void)
522{
523	initcall_t *call, *start, *end;
524
525	start = &__earlyinitcall_start;
526	end = &__earlyinitcall_end;
527
528	for (call = start; call < end; call++) {
529		if (earlyinit_debug)
530			printk("calling earlyinitcall 0x%p\n", *call);
531
532		(*call)();
533	}
534}
535
536void __init setup_arch(char **cmdline_p)
537{
538	cpu_probe();
539	prom_init();
540	cpu_report();
541
542#if defined(CONFIG_VT)
543#if defined(CONFIG_VGA_CONSOLE)
544        conswitchp = &vga_con;
545#elif defined(CONFIG_DUMMY_CONSOLE)
546        conswitchp = &dummy_con;
547#endif
548#endif
549
550	/* call board setup routine */
551	do_earlyinitcalls();
552
553	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
554	strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
555
556	*cmdline_p = command_line;
557
558	parse_cmdline_early();
559	bootmem_init();
560	paging_init();
561	resource_init();
562}
563
564int __init fpu_disable(char *s)
565{
566	cpu_data[0].options &= ~MIPS_CPU_FPU;
567
568	return 1;
569}
570
571__setup("nofpu", fpu_disable);