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");
206 #ifdef CONFIG_BLK_DEV_INITRD
208 static int __init parse_rd_cmdline(unsigned long *rd_start, unsigned long *rd_end)
211 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
212 * "rd_size=0xNN" it's size
214 unsigned long start = 0;
215 unsigned long size = 0;
217 char cmd_line[CL_SIZE];
222 strcpy(cmd_line, command_line);
225 /* Ignore "rd_start=" strings in other parameters. */
226 start_str = strstr(cmd_line, "rd_start=");
227 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
228 start_str = strstr(start_str, " rd_start=");
230 if (start_str != cmd_line)
231 strncat(command_line, tmp, start_str - tmp);
232 start = memparse(start_str + 9, &start_str);
234 start_str = strstr(start_str, " rd_start=");
237 strcat(command_line, tmp);
239 strcpy(cmd_line, command_line);
242 /* Ignore "rd_size" strings in other parameters. */
243 size_str = strstr(cmd_line, "rd_size=");
244 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
245 size_str = strstr(size_str, " rd_size=");
247 if (size_str != cmd_line)
248 strncat(command_line, tmp, size_str - tmp);
249 size = memparse(size_str + 8, &size_str);
251 size_str = strstr(size_str, " rd_size=");
254 strcat(command_line, tmp);
257 /* HACK: Guess if the sign extension was forgotten */
258 if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
259 start |= 0xffffffff00000000UL;
271 static unsigned long __init init_initrd(void)
273 unsigned long tmp, end;
276 ROOT_DEV = Root_RAM0;
278 if (parse_rd_cmdline(&initrd_start, &initrd_end))
281 * Board specific code should have set up initrd_start
284 end = (unsigned long)&_end;
285 tmp = PAGE_ALIGN(end) - sizeof(u32) * 2;
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];
297 static void __init finalize_initrd(void)
299 unsigned long size = initrd_end - initrd_start;
302 printk(KERN_INFO "Initrd not found or empty");
305 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
306 printk("Initrd extends beyond end of memory");
310 reserve_bootmem(CPHYSADDR(initrd_start), size);
311 initrd_below_start_ok = 1;
313 printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
317 printk(" - disabling initrd\n");
322 #else /* !CONFIG_BLK_DEV_INITRD */
324 #define init_initrd() 0
325 #define finalize_initrd() do {} while (0)
330 * Initialize the bootmem allocator. It also setup initrd related data
333 #ifdef CONFIG_SGI_IP27
335 static void __init bootmem_init(void)
341 #else /* !CONFIG_SGI_IP27 */
343 static void __init bootmem_init(void)
345 unsigned long reserved_end;
346 unsigned long highest = 0;
347 unsigned long mapstart = -1UL;
348 unsigned long bootmap_size;
352 * Init any data related to initrd. It's a nop if INITRD is
353 * not selected. Once that done we can determine the low bound
356 reserved_end = init_initrd();
357 reserved_end = PFN_UP(CPHYSADDR(max(reserved_end, (unsigned long)&_end)));
360 * Find the highest page frame number we have available.
362 for (i = 0; i < boot_mem_map.nr_map; i++) {
363 unsigned long start, end;
365 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
368 start = PFN_UP(boot_mem_map.map[i].addr);
369 end = PFN_DOWN(boot_mem_map.map[i].addr
370 + boot_mem_map.map[i].size);
374 if (end <= reserved_end)
376 if (start >= mapstart)
378 mapstart = max(reserved_end, start);
382 * Determine low and high memory ranges
384 if (highest > PFN_DOWN(HIGHMEM_START)) {
385 #ifdef CONFIG_HIGHMEM
386 highstart_pfn = PFN_DOWN(HIGHMEM_START);
387 highend_pfn = highest;
389 highest = PFN_DOWN(HIGHMEM_START);
393 * Initialize the boot-time allocator with low memory only.
395 bootmap_size = init_bootmem(mapstart, highest);
398 * Register fully available low RAM pages with the bootmem allocator.
400 for (i = 0; i < boot_mem_map.nr_map; i++) {
401 unsigned long start, end, size;
404 * Reserve usable memory.
406 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
409 start = PFN_UP(boot_mem_map.map[i].addr);
410 end = PFN_DOWN(boot_mem_map.map[i].addr
411 + boot_mem_map.map[i].size);
413 * We are rounding up the start address of usable memory
414 * and at the end of the usable range downwards.
416 if (start >= max_low_pfn)
418 if (start < reserved_end)
419 start = reserved_end;
420 if (end > max_low_pfn)
424 * ... finally, is the area going away?
430 /* Register lowmem ranges */
431 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
432 memory_present(0, start, end);
436 * Reserve the bootmap memory.
438 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
441 * Reserve initrd memory if needed.
446 #endif /* CONFIG_SGI_IP27 */
449 * arch_mem_init - initialize memory managment subsystem
451 * o plat_mem_setup() detects the memory configuration and will record detected
452 * memory areas using add_memory_region.
453 * o parse_cmdline_early() parses the command line for mem= options which,
454 * iff detected, will override the results of the automatic detection.
456 * At this stage the memory configuration of the system is known to the
457 * kernel but generic memory managment system is still entirely uninitialized.
463 * At this stage the bootmem allocator is ready to use.
465 * NOTE: historically plat_mem_setup did the entire platform initialization.
466 * This was rather impractical because it meant plat_mem_setup had to
467 * get away without any kind of memory allocator. To keep old code from
468 * breaking plat_setup was just renamed to plat_setup and a second platform
469 * initialization hook for anything else was introduced.
472 extern void plat_mem_setup(void);
474 static void __init arch_mem_init(char **cmdline_p)
476 /* call board setup routine */
479 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
480 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
482 *cmdline_p = command_line;
484 parse_cmdline_early();
490 #define MAXMEM HIGHMEM_START
491 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
493 static inline void resource_init(void)
497 if (UNCAC_BASE != IO_BASE)
500 code_resource.start = virt_to_phys(&_text);
501 code_resource.end = virt_to_phys(&_etext) - 1;
502 data_resource.start = virt_to_phys(&_etext);
503 data_resource.end = virt_to_phys(&_edata) - 1;
506 * Request address space for all standard RAM.
508 for (i = 0; i < boot_mem_map.nr_map; i++) {
509 struct resource *res;
510 unsigned long start, end;
512 start = boot_mem_map.map[i].addr;
513 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
519 res = alloc_bootmem(sizeof(struct resource));
520 switch (boot_mem_map.map[i].type) {
522 case BOOT_MEM_ROM_DATA:
523 res->name = "System RAM";
525 case BOOT_MEM_RESERVED:
527 res->name = "reserved";
533 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
534 request_resource(&iomem_resource, res);
537 * We don't know which RAM region contains kernel data,
538 * so we try it repeatedly and let the resource manager
541 request_resource(res, &code_resource);
542 request_resource(res, &data_resource);
549 void __init setup_arch(char **cmdline_p)
555 #if defined(CONFIG_VT)
556 #if defined(CONFIG_VGA_CONSOLE)
557 conswitchp = &vga_con;
558 #elif defined(CONFIG_DUMMY_CONSOLE)
559 conswitchp = &dummy_con;
563 arch_mem_init(cmdline_p);
571 int __init fpu_disable(char *s)
575 for (i = 0; i < NR_CPUS; i++)
576 cpu_data[i].options &= ~MIPS_CPU_FPU;
581 __setup("nofpu", fpu_disable);
583 int __init dsp_disable(char *s)
585 cpu_data[0].ases &= ~MIPS_ASE_DSP;
590 __setup("nodsp", dsp_disable);