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
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
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>
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>
37 #include <asm/addrspace.h>
38 #include <asm/bootinfo.h>
40 #include <asm/sections.h>
41 #include <asm/system.h>
43 struct cpuinfo_mips cpu_data[NR_CPUS];
45 EXPORT_SYMBOL(cpu_data);
48 struct screen_info screen_info;
52 * Despite it's name this variable is even if we don't have PCI
54 unsigned int PCI_DMA_BUS_IS_PHYS;
56 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
58 extern void * __rd_start, * __rd_end;
63 * These are initialized so they are in the .data section
65 unsigned long mips_machtype = MACH_UNKNOWN;
66 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
68 EXPORT_SYMBOL(mips_machtype);
69 EXPORT_SYMBOL(mips_machgroup);
71 struct boot_mem_map boot_mem_map;
73 static char command_line[CL_SIZE];
74 char saved_command_line[CL_SIZE];
75 char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
78 * mips_io_port_base is the begin of the address space to which x86 style
79 * I/O ports are mapped.
81 const unsigned long mips_io_port_base = -1;
82 EXPORT_SYMBOL(mips_io_port_base);
85 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
88 unsigned long isa_slot_offset;
89 EXPORT_SYMBOL(isa_slot_offset);
91 static struct resource code_resource = { "Kernel code" };
92 static struct resource data_resource = { "Kernel data" };
94 void __init add_memory_region(phys_t start, phys_t size, long type)
96 int x = boot_mem_map.nr_map;
97 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
100 * Try to merge with previous entry if any. This is far less than
101 * perfect but is sufficient for most real world cases.
103 if (x && prev->addr + prev->size == start && prev->type == type) {
108 if (x == BOOT_MEM_MAP_MAX) {
109 printk("Ooops! Too many entries in the memory map!\n");
113 boot_mem_map.map[x].addr = start;
114 boot_mem_map.map[x].size = size;
115 boot_mem_map.map[x].type = type;
116 boot_mem_map.nr_map++;
119 static void __init print_memory_map(void)
122 const int field = 2 * sizeof(unsigned long);
124 for (i = 0; i < boot_mem_map.nr_map; i++) {
125 printk(" memory: %0*Lx @ %0*Lx ",
126 field, (unsigned long long) boot_mem_map.map[i].size,
127 field, (unsigned long long) boot_mem_map.map[i].addr);
129 switch (boot_mem_map.map[i].type) {
131 printk("(usable)\n");
133 case BOOT_MEM_ROM_DATA:
134 printk("(ROM data)\n");
136 case BOOT_MEM_RESERVED:
137 printk("(reserved)\n");
140 printk("type %lu\n", boot_mem_map.map[i].type);
146 static inline void parse_cmdline_early(void)
148 char c = ' ', *to = command_line, *from = saved_command_line;
149 unsigned long start_at, mem_size;
153 printk("Determined physical RAM map:\n");
158 * "mem=XXX[kKmM]" defines a memory region from
159 * 0 to <XXX>, overriding the determined size.
160 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
161 * <YYY> to <YYY>+<XXX>, overriding the determined size.
163 if (c == ' ' && !memcmp(from, "mem=", 4)) {
164 if (to != command_line)
167 * If a user specifies memory size, we
168 * blow away any automatically generated
172 boot_mem_map.nr_map = 0;
175 mem_size = memparse(from + 4, &from);
177 start_at = memparse(from + 1, &from);
180 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
185 if (CL_SIZE <= ++len)
192 printk("User-defined physical RAM map:\n");
198 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
199 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
200 #define PFN_PHYS(x) ((x) << PAGE_SHIFT)
202 #define MAXMEM HIGHMEM_START
203 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
205 static inline void bootmem_init(void)
207 unsigned long start_pfn;
208 #ifndef CONFIG_SGI_IP27
209 unsigned long bootmap_size, max_low_pfn, first_usable_pfn;
212 #ifdef CONFIG_BLK_DEV_INITRD
214 unsigned long *initrd_header;
216 tmp = (((unsigned long)&_end + PAGE_SIZE-1) & PAGE_MASK) - 8;
217 if (tmp < (unsigned long)&_end)
219 initrd_header = (unsigned long *)tmp;
220 if (initrd_header[0] == 0x494E5244) {
221 initrd_start = (unsigned long)&initrd_header[2];
222 initrd_end = initrd_start + initrd_header[1];
224 start_pfn = PFN_UP(CPHYSADDR((&_end)+(initrd_end - initrd_start) + PAGE_SIZE));
227 * Partially used pages are not usable - thus
228 * we are rounding upwards.
230 start_pfn = PFN_UP(CPHYSADDR(&_end));
231 #endif /* CONFIG_BLK_DEV_INITRD */
233 #ifndef CONFIG_SGI_IP27
234 /* Find the highest page frame number we have available. */
236 first_usable_pfn = -1UL;
237 for (i = 0; i < boot_mem_map.nr_map; i++) {
238 unsigned long start, end;
240 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
243 start = PFN_UP(boot_mem_map.map[i].addr);
244 end = PFN_DOWN(boot_mem_map.map[i].addr
245 + boot_mem_map.map[i].size);
251 if (start < first_usable_pfn) {
252 if (start > start_pfn) {
253 first_usable_pfn = start;
254 } else if (end > start_pfn) {
255 first_usable_pfn = start_pfn;
261 * Determine low and high memory ranges
263 max_low_pfn = max_pfn;
264 if (max_low_pfn > MAXMEM_PFN) {
265 max_low_pfn = MAXMEM_PFN;
266 #ifndef CONFIG_HIGHMEM
267 /* Maximum memory usable is what is directly addressable */
268 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
270 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
274 #ifdef CONFIG_HIGHMEM
276 * Crude, we really should make a better attempt at detecting
279 highstart_pfn = highend_pfn = max_pfn;
280 if (max_pfn > MAXMEM_PFN) {
281 highstart_pfn = MAXMEM_PFN;
282 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
283 (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
287 /* Initialize the boot-time allocator with low memory only. */
288 bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
291 * Register fully available low RAM pages with the bootmem allocator.
293 for (i = 0; i < boot_mem_map.nr_map; i++) {
294 unsigned long curr_pfn, last_pfn, size;
297 * Reserve usable memory.
299 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
303 * We are rounding up the start address of usable memory:
305 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
306 if (curr_pfn >= max_low_pfn)
308 if (curr_pfn < start_pfn)
309 curr_pfn = start_pfn;
312 * ... and at the end of the usable range downwards:
314 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
315 + boot_mem_map.map[i].size);
317 if (last_pfn > max_low_pfn)
318 last_pfn = max_low_pfn;
321 * Only register lowmem part of lowmem segment with bootmem.
323 size = last_pfn - curr_pfn;
324 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
326 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
327 size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
332 * ... finally, did all the rounding and playing
333 * around just make the area go away?
335 if (last_pfn <= curr_pfn)
338 /* Register lowmem ranges */
339 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
342 /* Reserve the bootmap memory. */
343 reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
346 #ifdef CONFIG_BLK_DEV_INITRD
347 /* Board specific code should have set up initrd_start and initrd_end */
348 ROOT_DEV = Root_RAM0;
349 if (&__rd_start != &__rd_end) {
350 initrd_start = (unsigned long)&__rd_start;
351 initrd_end = (unsigned long)&__rd_end;
353 initrd_below_start_ok = 1;
355 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
356 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
357 (void *)initrd_start,
360 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
361 printk("initrd extends beyond end of memory "
362 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
363 sizeof(long) * 2, CPHYSADDR(initrd_end),
364 sizeof(long) * 2, PFN_PHYS(max_low_pfn));
365 initrd_start = initrd_end = 0;
368 #endif /* CONFIG_BLK_DEV_INITRD */
371 static inline void resource_init(void)
375 code_resource.start = virt_to_phys(&_text);
376 code_resource.end = virt_to_phys(&_etext) - 1;
377 data_resource.start = virt_to_phys(&_etext);
378 data_resource.end = virt_to_phys(&_edata) - 1;
381 * Request address space for all standard RAM.
383 for (i = 0; i < boot_mem_map.nr_map; i++) {
384 struct resource *res;
385 unsigned long start, end;
387 start = boot_mem_map.map[i].addr;
388 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
394 res = alloc_bootmem(sizeof(struct resource));
395 switch (boot_mem_map.map[i].type) {
397 case BOOT_MEM_ROM_DATA:
398 res->name = "System RAM";
400 case BOOT_MEM_RESERVED:
402 res->name = "reserved";
408 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
409 request_resource(&iomem_resource, res);
412 * We don't know which RAM region contains kernel data,
413 * so we try it repeatedly and let the resource manager
416 request_resource(res, &code_resource);
417 request_resource(res, &data_resource);
428 static int __initdata earlyinit_debug;
430 static int __init earlyinit_debug_setup(char *str)
435 __setup("earlyinit_debug", earlyinit_debug_setup);
437 extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
439 static void __init do_earlyinitcalls(void)
441 initcall_t *call, *start, *end;
443 start = &__earlyinitcall_start;
444 end = &__earlyinitcall_end;
446 for (call = start; call < end; call++) {
448 printk("calling earlyinitcall 0x%p\n", *call);
454 void __init setup_arch(char **cmdline_p)
461 /* Disable coprocessors and set FPU for 16/32 FPR register model */
462 clear_c0_status(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR);
463 set_c0_status(ST0_CU0);
467 * On IP27, I am seeing the TS bit set when the kernel is loaded.
468 * Maybe because the kernel is in ckseg0 and not xkphys? Clear it
471 clear_c0_status(ST0_BEV|ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3);
472 set_c0_status(ST0_CU0|ST0_KX|ST0_SX|ST0_FR);
475 #if defined(CONFIG_VT)
476 #if defined(CONFIG_VGA_CONSOLE)
477 conswitchp = &vga_con;
478 #elif defined(CONFIG_DUMMY_CONSOLE)
479 conswitchp = &dummy_con;
483 /* call board setup routine */
486 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
487 strlcpy(saved_command_line, command_line, sizeof(saved_command_line));
489 *cmdline_p = command_line;
491 parse_cmdline_early();
497 int __init fpu_disable(char *s)
499 cpu_data[0].options &= ~MIPS_CPU_FPU;
504 __setup("nofpu", fpu_disable);