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/init.h>
14 #include <linux/ioport.h>
15 #include <linux/module.h>
16 #include <linux/screen_info.h>
17 #include <linux/bootmem.h>
18 #include <linux/initrd.h>
19 #include <linux/root_dev.h>
20 #include <linux/highmem.h>
21 #include <linux/console.h>
22 #include <linux/pfn.h>
24 #include <asm/addrspace.h>
25 #include <asm/bootinfo.h>
26 #include <asm/cache.h>
28 #include <asm/sections.h>
29 #include <asm/setup.h>
30 #include <asm/system.h>
32 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
34 EXPORT_SYMBOL(cpu_data);
37 struct screen_info screen_info;
41 * Despite it's name this variable is even if we don't have PCI
43 unsigned int PCI_DMA_BUS_IS_PHYS;
45 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
50 * These are initialized so they are in the .data section
52 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
53 unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
55 EXPORT_SYMBOL(mips_machtype);
56 EXPORT_SYMBOL(mips_machgroup);
58 struct boot_mem_map boot_mem_map;
60 static char command_line[CL_SIZE];
61 char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
64 * mips_io_port_base is the begin of the address space to which x86 style
65 * I/O ports are mapped.
67 const unsigned long mips_io_port_base __read_mostly = -1;
68 EXPORT_SYMBOL(mips_io_port_base);
71 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
74 unsigned long isa_slot_offset;
75 EXPORT_SYMBOL(isa_slot_offset);
77 static struct resource code_resource = { .name = "Kernel code", };
78 static struct resource data_resource = { .name = "Kernel data", };
80 void __init add_memory_region(phys_t start, phys_t size, long type)
82 int x = boot_mem_map.nr_map;
83 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
86 if (start + size < start) {
87 printk("Trying to add an invalid memory region, skipped\n");
92 * Try to merge with previous entry if any. This is far less than
93 * perfect but is sufficient for most real world cases.
95 if (x && prev->addr + prev->size == start && prev->type == type) {
100 if (x == BOOT_MEM_MAP_MAX) {
101 printk("Ooops! Too many entries in the memory map!\n");
105 boot_mem_map.map[x].addr = start;
106 boot_mem_map.map[x].size = size;
107 boot_mem_map.map[x].type = type;
108 boot_mem_map.nr_map++;
111 static void __init print_memory_map(void)
114 const int field = 2 * sizeof(unsigned long);
116 for (i = 0; i < boot_mem_map.nr_map; i++) {
117 printk(" memory: %0*Lx @ %0*Lx ",
118 field, (unsigned long long) boot_mem_map.map[i].size,
119 field, (unsigned long long) boot_mem_map.map[i].addr);
121 switch (boot_mem_map.map[i].type) {
123 printk("(usable)\n");
125 case BOOT_MEM_ROM_DATA:
126 printk("(ROM data)\n");
128 case BOOT_MEM_RESERVED:
129 printk("(reserved)\n");
132 printk("type %lu\n", boot_mem_map.map[i].type);
138 static inline void parse_cmdline_early(void)
140 char c = ' ', *to = command_line, *from = saved_command_line;
141 unsigned long start_at, mem_size;
145 printk("Determined physical RAM map:\n");
150 * "mem=XXX[kKmM]" defines a memory region from
151 * 0 to <XXX>, overriding the determined size.
152 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
153 * <YYY> to <YYY>+<XXX>, overriding the determined size.
155 if (c == ' ' && !memcmp(from, "mem=", 4)) {
156 if (to != command_line)
159 * If a user specifies memory size, we
160 * blow away any automatically generated
164 boot_mem_map.nr_map = 0;
167 mem_size = memparse(from + 4, &from);
169 start_at = memparse(from + 1, &from);
172 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
177 if (CL_SIZE <= ++len)
184 printk("User-defined physical RAM map:\n");
192 #ifdef CONFIG_BLK_DEV_INITRD
194 static int __init parse_rd_cmdline(unsigned long *rd_start, unsigned long *rd_end)
197 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
198 * "rd_size=0xNN" it's size
200 unsigned long start = 0;
201 unsigned long size = 0;
203 char cmd_line[CL_SIZE];
208 strcpy(cmd_line, command_line);
211 /* Ignore "rd_start=" strings in other parameters. */
212 start_str = strstr(cmd_line, "rd_start=");
213 if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
214 start_str = strstr(start_str, " rd_start=");
216 if (start_str != cmd_line)
217 strncat(command_line, tmp, start_str - tmp);
218 start = memparse(start_str + 9, &start_str);
220 start_str = strstr(start_str, " rd_start=");
223 strcat(command_line, tmp);
225 strcpy(cmd_line, command_line);
228 /* Ignore "rd_size" strings in other parameters. */
229 size_str = strstr(cmd_line, "rd_size=");
230 if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
231 size_str = strstr(size_str, " rd_size=");
233 if (size_str != cmd_line)
234 strncat(command_line, tmp, size_str - tmp);
235 size = memparse(size_str + 8, &size_str);
237 size_str = strstr(size_str, " rd_size=");
240 strcat(command_line, tmp);
243 /* HACK: Guess if the sign extension was forgotten */
244 if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
245 start |= 0xffffffff00000000UL;
257 static unsigned long __init init_initrd(void)
259 unsigned long tmp, end;
262 ROOT_DEV = Root_RAM0;
264 if (parse_rd_cmdline(&initrd_start, &initrd_end))
267 * Board specific code should have set up initrd_start
270 end = (unsigned long)&_end;
271 tmp = PAGE_ALIGN(end) - sizeof(u32) * 2;
275 initrd_header = (u32 *)tmp;
276 if (initrd_header[0] == 0x494E5244) {
277 initrd_start = (unsigned long)&initrd_header[2];
278 initrd_end = initrd_start + initrd_header[1];
283 static void __init finalize_initrd(void)
285 unsigned long size = initrd_end - initrd_start;
288 printk(KERN_INFO "Initrd not found or empty");
291 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
292 printk("Initrd extends beyond end of memory");
296 reserve_bootmem(CPHYSADDR(initrd_start), size);
297 initrd_below_start_ok = 1;
299 printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
303 printk(" - disabling initrd\n");
308 #else /* !CONFIG_BLK_DEV_INITRD */
310 #define init_initrd() 0
311 #define finalize_initrd() do {} while (0)
316 * Initialize the bootmem allocator. It also setup initrd related data
319 #ifdef CONFIG_SGI_IP27
321 static void __init bootmem_init(void)
327 #else /* !CONFIG_SGI_IP27 */
329 static void __init bootmem_init(void)
331 unsigned long reserved_end;
332 unsigned long highest = 0;
333 unsigned long mapstart = -1UL;
334 unsigned long bootmap_size;
338 * Init any data related to initrd. It's a nop if INITRD is
339 * not selected. Once that done we can determine the low bound
342 reserved_end = init_initrd();
343 reserved_end = PFN_UP(CPHYSADDR(max(reserved_end, (unsigned long)&_end)));
346 * Find the highest page frame number we have available.
348 for (i = 0; i < boot_mem_map.nr_map; i++) {
349 unsigned long start, end;
351 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
354 start = PFN_UP(boot_mem_map.map[i].addr);
355 end = PFN_DOWN(boot_mem_map.map[i].addr
356 + boot_mem_map.map[i].size);
360 if (end <= reserved_end)
362 if (start >= mapstart)
364 mapstart = max(reserved_end, start);
368 * Determine low and high memory ranges
370 if (highest > PFN_DOWN(HIGHMEM_START)) {
371 #ifdef CONFIG_HIGHMEM
372 highstart_pfn = PFN_DOWN(HIGHMEM_START);
373 highend_pfn = highest;
375 highest = PFN_DOWN(HIGHMEM_START);
379 * Initialize the boot-time allocator with low memory only.
381 bootmap_size = init_bootmem(mapstart, highest);
384 * Register fully available low RAM pages with the bootmem allocator.
386 for (i = 0; i < boot_mem_map.nr_map; i++) {
387 unsigned long start, end, size;
390 * Reserve usable memory.
392 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
395 start = PFN_UP(boot_mem_map.map[i].addr);
396 end = PFN_DOWN(boot_mem_map.map[i].addr
397 + boot_mem_map.map[i].size);
399 * We are rounding up the start address of usable memory
400 * and at the end of the usable range downwards.
402 if (start >= max_low_pfn)
404 if (start < reserved_end)
405 start = reserved_end;
406 if (end > max_low_pfn)
410 * ... finally, is the area going away?
416 /* Register lowmem ranges */
417 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
418 memory_present(0, start, end);
422 * Reserve the bootmap memory.
424 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
427 * Reserve initrd memory if needed.
432 #endif /* CONFIG_SGI_IP27 */
435 * arch_mem_init - initialize memory managment subsystem
437 * o plat_mem_setup() detects the memory configuration and will record detected
438 * memory areas using add_memory_region.
439 * o parse_cmdline_early() parses the command line for mem= options which,
440 * iff detected, will override the results of the automatic detection.
442 * At this stage the memory configuration of the system is known to the
443 * kernel but generic memory managment system is still entirely uninitialized.
449 * At this stage the bootmem allocator is ready to use.
451 * NOTE: historically plat_mem_setup did the entire platform initialization.
452 * This was rather impractical because it meant plat_mem_setup had to
453 * get away without any kind of memory allocator. To keep old code from
454 * breaking plat_setup was just renamed to plat_setup and a second platform
455 * initialization hook for anything else was introduced.
458 extern void plat_mem_setup(void);
460 static void __init arch_mem_init(char **cmdline_p)
462 /* call board setup routine */
465 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
466 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
468 *cmdline_p = command_line;
470 parse_cmdline_early();
476 #define MAXMEM HIGHMEM_START
477 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
479 static inline void resource_init(void)
483 if (UNCAC_BASE != IO_BASE)
486 code_resource.start = virt_to_phys(&_text);
487 code_resource.end = virt_to_phys(&_etext) - 1;
488 data_resource.start = virt_to_phys(&_etext);
489 data_resource.end = virt_to_phys(&_edata) - 1;
492 * Request address space for all standard RAM.
494 for (i = 0; i < boot_mem_map.nr_map; i++) {
495 struct resource *res;
496 unsigned long start, end;
498 start = boot_mem_map.map[i].addr;
499 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
505 res = alloc_bootmem(sizeof(struct resource));
506 switch (boot_mem_map.map[i].type) {
508 case BOOT_MEM_ROM_DATA:
509 res->name = "System RAM";
511 case BOOT_MEM_RESERVED:
513 res->name = "reserved";
519 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
520 request_resource(&iomem_resource, res);
523 * We don't know which RAM region contains kernel data,
524 * so we try it repeatedly and let the resource manager
527 request_resource(res, &code_resource);
528 request_resource(res, &data_resource);
535 void __init setup_arch(char **cmdline_p)
541 #if defined(CONFIG_VT)
542 #if defined(CONFIG_VGA_CONSOLE)
543 conswitchp = &vga_con;
544 #elif defined(CONFIG_DUMMY_CONSOLE)
545 conswitchp = &dummy_con;
549 arch_mem_init(cmdline_p);
557 int __init fpu_disable(char *s)
561 for (i = 0; i < NR_CPUS; i++)
562 cpu_data[i].options &= ~MIPS_CPU_FPU;
567 __setup("nofpu", fpu_disable);
569 int __init dsp_disable(char *s)
571 cpu_data[0].ases &= ~MIPS_ASE_DSP;
576 __setup("nodsp", dsp_disable);