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/errno.h>
14 #include <linux/init.h>
15 #include <linux/ioport.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/stddef.h>
21 #include <linux/string.h>
22 #include <linux/unistd.h>
23 #include <linux/slab.h>
24 #include <linux/user.h>
25 #include <linux/utsname.h>
26 #include <linux/a.out.h>
27 #include <linux/screen_info.h>
28 #include <linux/bootmem.h>
29 #include <linux/initrd.h>
30 #include <linux/major.h>
31 #include <linux/kdev_t.h>
32 #include <linux/root_dev.h>
33 #include <linux/highmem.h>
34 #include <linux/console.h>
35 #include <linux/mmzone.h>
36 #include <linux/pfn.h>
38 #include <asm/addrspace.h>
39 #include <asm/bootinfo.h>
40 #include <asm/cache.h>
42 #include <asm/sections.h>
43 #include <asm/setup.h>
44 #include <asm/system.h>
46 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
48 EXPORT_SYMBOL(cpu_data);
51 struct screen_info screen_info;
55 * Despite it's name this variable is even if we don't have PCI
57 unsigned int PCI_DMA_BUS_IS_PHYS;
59 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
64 * These are initialized so they are in the .data section
66 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
67 unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
69 EXPORT_SYMBOL(mips_machtype);
70 EXPORT_SYMBOL(mips_machgroup);
72 struct boot_mem_map boot_mem_map;
74 static char 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 __read_mostly = -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 = { .name = "Kernel code", };
92 static struct resource data_resource = { .name = "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 if (start + size < start) {
101 printk("Trying to add an invalid memory region, skipped\n");
106 * Try to merge with previous entry if any. This is far less than
107 * perfect but is sufficient for most real world cases.
109 if (x && prev->addr + prev->size == start && prev->type == type) {
114 if (x == BOOT_MEM_MAP_MAX) {
115 printk("Ooops! Too many entries in the memory map!\n");
119 boot_mem_map.map[x].addr = start;
120 boot_mem_map.map[x].size = size;
121 boot_mem_map.map[x].type = type;
122 boot_mem_map.nr_map++;
125 static void __init print_memory_map(void)
128 const int field = 2 * sizeof(unsigned long);
130 for (i = 0; i < boot_mem_map.nr_map; i++) {
131 printk(" memory: %0*Lx @ %0*Lx ",
132 field, (unsigned long long) boot_mem_map.map[i].size,
133 field, (unsigned long long) boot_mem_map.map[i].addr);
135 switch (boot_mem_map.map[i].type) {
137 printk("(usable)\n");
139 case BOOT_MEM_ROM_DATA:
140 printk("(ROM data)\n");
142 case BOOT_MEM_RESERVED:
143 printk("(reserved)\n");
146 printk("type %lu\n", boot_mem_map.map[i].type);
152 static inline void parse_cmdline_early(void)
154 char c = ' ', *to = command_line, *from = saved_command_line;
155 unsigned long start_at, mem_size;
159 printk("Determined physical RAM map:\n");
164 * "mem=XXX[kKmM]" defines a memory region from
165 * 0 to <XXX>, overriding the determined size.
166 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
167 * <YYY> to <YYY>+<XXX>, overriding the determined size.
169 if (c == ' ' && !memcmp(from, "mem=", 4)) {
170 if (to != command_line)
173 * If a user specifies memory size, we
174 * blow away any automatically generated
178 boot_mem_map.nr_map = 0;
181 mem_size = memparse(from + 4, &from);
183 start_at = memparse(from + 1, &from);
186 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
191 if (CL_SIZE <= ++len)
198 printk("User-defined physical RAM map:\n");
203 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
206 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
207 * "rd_size=0xNN" it's size
209 unsigned long start = 0;
210 unsigned long size = 0;
212 char cmd_line[CL_SIZE];
217 strcpy(cmd_line, command_line);
220 /* Ignore "rd_start=" strings in other parameters. */
221 start_str = strstr(cmd_line, "rd_start=");
222 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
223 start_str = strstr(start_str, " rd_start=");
225 if (start_str != cmd_line)
226 strncat(command_line, tmp, start_str - tmp);
227 start = memparse(start_str + 9, &start_str);
229 start_str = strstr(start_str, " rd_start=");
232 strcat(command_line, tmp);
234 strcpy(cmd_line, command_line);
237 /* Ignore "rd_size" strings in other parameters. */
238 size_str = strstr(cmd_line, "rd_size=");
239 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
240 size_str = strstr(size_str, " rd_size=");
242 if (size_str != cmd_line)
243 strncat(command_line, tmp, size_str - tmp);
244 size = memparse(size_str + 8, &size_str);
246 size_str = strstr(size_str, " rd_size=");
249 strcat(command_line, tmp);
252 /* HACK: Guess if the sign extension was forgotten */
253 if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
254 start |= 0xffffffff00000000UL;
267 * Initialize the bootmem allocator. It also setup initrd related data
270 static void __init bootmem_init(void)
272 unsigned long reserved_end = (unsigned long)&_end;
273 #ifndef CONFIG_SGI_IP27
274 unsigned long highest = 0;
275 unsigned long mapstart = -1UL;
276 unsigned long bootmap_size;
279 #ifdef CONFIG_BLK_DEV_INITRD
280 int initrd_reserve_bootmem = 0;
282 /* Board specific code should have set up initrd_start and initrd_end */
283 ROOT_DEV = Root_RAM0;
284 if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
285 reserved_end = max(reserved_end, initrd_end);
286 initrd_reserve_bootmem = 1;
291 tmp = PAGE_ALIGN(reserved_end) - sizeof(u32) * 2;
292 if (tmp < reserved_end)
294 initrd_header = (u32 *)tmp;
295 if (initrd_header[0] == 0x494E5244) {
296 initrd_start = (unsigned long)&initrd_header[2];
297 initrd_end = initrd_start + initrd_header[1];
298 reserved_end = max(reserved_end, initrd_end);
299 initrd_reserve_bootmem = 1;
302 #endif /* CONFIG_BLK_DEV_INITRD */
304 #ifndef CONFIG_SGI_IP27
306 * reserved_end is now a pfn
308 reserved_end = PFN_UP(CPHYSADDR(reserved_end));
311 * Find the highest page frame number we have available.
313 for (i = 0; i < boot_mem_map.nr_map; i++) {
314 unsigned long start, end;
316 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
319 start = PFN_UP(boot_mem_map.map[i].addr);
320 end = PFN_DOWN(boot_mem_map.map[i].addr
321 + boot_mem_map.map[i].size);
325 if (end <= reserved_end)
327 if (start >= mapstart)
329 mapstart = max(reserved_end, start);
333 * Determine low and high memory ranges
335 if (highest > PFN_DOWN(HIGHMEM_START)) {
336 #ifdef CONFIG_HIGHMEM
337 highstart_pfn = PFN_DOWN(HIGHMEM_START);
338 highend_pfn = highest;
340 highest = PFN_DOWN(HIGHMEM_START);
344 * Initialize the boot-time allocator with low memory only.
346 bootmap_size = init_bootmem(mapstart, highest);
349 * Register fully available low RAM pages with the bootmem allocator.
351 for (i = 0; i < boot_mem_map.nr_map; i++) {
352 unsigned long start, end, size;
355 * Reserve usable memory.
357 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
360 start = PFN_UP(boot_mem_map.map[i].addr);
361 end = PFN_DOWN(boot_mem_map.map[i].addr
362 + boot_mem_map.map[i].size);
364 * We are rounding up the start address of usable memory
365 * and at the end of the usable range downwards.
367 if (start >= max_low_pfn)
369 if (start < reserved_end)
370 start = reserved_end;
371 if (end > max_low_pfn)
375 * ... finally, is the area going away?
381 /* Register lowmem ranges */
382 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
383 memory_present(0, start, end);
387 * Reserve the bootmap memory.
389 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
391 #endif /* CONFIG_SGI_IP27 */
393 #ifdef CONFIG_BLK_DEV_INITRD
394 initrd_below_start_ok = 1;
396 unsigned long initrd_size = ((unsigned char *)initrd_end) -
397 ((unsigned char *)initrd_start);
398 const int width = sizeof(long) * 2;
400 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
401 (void *)initrd_start, initrd_size);
403 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
404 printk("initrd extends beyond end of memory "
405 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
407 (unsigned long long) CPHYSADDR(initrd_end),
409 (unsigned long long) PFN_PHYS(max_low_pfn));
410 initrd_start = initrd_end = 0;
411 initrd_reserve_bootmem = 0;
414 if (initrd_reserve_bootmem)
415 reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
417 #endif /* CONFIG_BLK_DEV_INITRD */
421 * arch_mem_init - initialize memory managment subsystem
423 * o plat_mem_setup() detects the memory configuration and will record detected
424 * memory areas using add_memory_region.
425 * o parse_cmdline_early() parses the command line for mem= options which,
426 * iff detected, will override the results of the automatic detection.
428 * At this stage the memory configuration of the system is known to the
429 * kernel but generic memory managment system is still entirely uninitialized.
435 * At this stage the bootmem allocator is ready to use.
437 * NOTE: historically plat_mem_setup did the entire platform initialization.
438 * This was rather impractical because it meant plat_mem_setup had to
439 * get away without any kind of memory allocator. To keep old code from
440 * breaking plat_setup was just renamed to plat_setup and a second platform
441 * initialization hook for anything else was introduced.
444 extern void plat_mem_setup(void);
446 static void __init arch_mem_init(char **cmdline_p)
448 /* call board setup routine */
451 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
452 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
454 *cmdline_p = command_line;
456 parse_cmdline_early();
462 #define MAXMEM HIGHMEM_START
463 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
465 static inline void resource_init(void)
469 if (UNCAC_BASE != IO_BASE)
472 code_resource.start = virt_to_phys(&_text);
473 code_resource.end = virt_to_phys(&_etext) - 1;
474 data_resource.start = virt_to_phys(&_etext);
475 data_resource.end = virt_to_phys(&_edata) - 1;
478 * Request address space for all standard RAM.
480 for (i = 0; i < boot_mem_map.nr_map; i++) {
481 struct resource *res;
482 unsigned long start, end;
484 start = boot_mem_map.map[i].addr;
485 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
491 res = alloc_bootmem(sizeof(struct resource));
492 switch (boot_mem_map.map[i].type) {
494 case BOOT_MEM_ROM_DATA:
495 res->name = "System RAM";
497 case BOOT_MEM_RESERVED:
499 res->name = "reserved";
505 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
506 request_resource(&iomem_resource, res);
509 * We don't know which RAM region contains kernel data,
510 * so we try it repeatedly and let the resource manager
513 request_resource(res, &code_resource);
514 request_resource(res, &data_resource);
521 void __init setup_arch(char **cmdline_p)
527 #if defined(CONFIG_VT)
528 #if defined(CONFIG_VGA_CONSOLE)
529 conswitchp = &vga_con;
530 #elif defined(CONFIG_DUMMY_CONSOLE)
531 conswitchp = &dummy_con;
535 arch_mem_init(cmdline_p);
543 int __init fpu_disable(char *s)
547 for (i = 0; i < NR_CPUS; i++)
548 cpu_data[i].options &= ~MIPS_CPU_FPU;
553 __setup("nofpu", fpu_disable);
555 int __init dsp_disable(char *s)
557 cpu_data[0].ases &= ~MIPS_ASE_DSP;
562 __setup("nodsp", dsp_disable);