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);
141 #ifdef CONFIG_BLK_DEV_INITRD
143 static int __init rd_start_early(char *p)
145 unsigned long start = memparse(p, &p);
148 /* HACK: Guess if the sign extension was forgotten */
149 if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
150 start |= 0xffffffff00000000UL;
152 initrd_start = start;
157 early_param("rd_start", rd_start_early);
159 static int __init rd_size_early(char *p)
161 initrd_end += memparse(p, &p);
165 early_param("rd_size", rd_size_early);
167 static unsigned long __init init_initrd(void)
169 unsigned long tmp, end, size;
172 ROOT_DEV = Root_RAM0;
175 * Board specific code or command line parser should have
176 * already set up initrd_start and initrd_end. In these cases
177 * perfom sanity checks and use them if all looks good.
179 size = initrd_end - initrd_start;
180 if (initrd_end == 0 || size == 0) {
186 end = (unsigned long)&_end;
187 tmp = PAGE_ALIGN(end) - sizeof(u32) * 2;
191 initrd_header = (u32 *)tmp;
192 if (initrd_header[0] == 0x494E5244) {
193 initrd_start = (unsigned long)&initrd_header[2];
194 initrd_end = initrd_start + initrd_header[1];
199 static void __init finalize_initrd(void)
201 unsigned long size = initrd_end - initrd_start;
204 printk(KERN_INFO "Initrd not found or empty");
207 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
208 printk("Initrd extends beyond end of memory");
212 reserve_bootmem(__pa(initrd_start), size);
213 initrd_below_start_ok = 1;
215 printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
219 printk(" - disabling initrd\n");
224 #else /* !CONFIG_BLK_DEV_INITRD */
226 static unsigned long __init init_initrd(void)
231 #define finalize_initrd() do {} while (0)
236 * Initialize the bootmem allocator. It also setup initrd related data
239 #ifdef CONFIG_SGI_IP27
241 static void __init bootmem_init(void)
247 #else /* !CONFIG_SGI_IP27 */
249 static void __init bootmem_init(void)
251 unsigned long reserved_end;
252 unsigned long highest = 0;
253 unsigned long mapstart = -1UL;
254 unsigned long bootmap_size;
258 * Init any data related to initrd. It's a nop if INITRD is
259 * not selected. Once that done we can determine the low bound
262 reserved_end = init_initrd();
263 reserved_end = PFN_UP(max(__pa(reserved_end), __pa_symbol(&_end)));
266 * Find the highest page frame number we have available.
268 for (i = 0; i < boot_mem_map.nr_map; i++) {
269 unsigned long start, end;
271 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
274 start = PFN_UP(boot_mem_map.map[i].addr);
275 end = PFN_DOWN(boot_mem_map.map[i].addr
276 + boot_mem_map.map[i].size);
280 if (end <= reserved_end)
282 if (start >= mapstart)
284 mapstart = max(reserved_end, start);
288 * Determine low and high memory ranges
290 if (highest > PFN_DOWN(HIGHMEM_START)) {
291 #ifdef CONFIG_HIGHMEM
292 highstart_pfn = PFN_DOWN(HIGHMEM_START);
293 highend_pfn = highest;
295 highest = PFN_DOWN(HIGHMEM_START);
299 * Initialize the boot-time allocator with low memory only.
301 bootmap_size = init_bootmem(mapstart, highest);
304 * Register fully available low RAM pages with the bootmem allocator.
306 for (i = 0; i < boot_mem_map.nr_map; i++) {
307 unsigned long start, end, size;
310 * Reserve usable memory.
312 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
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);
319 * We are rounding up the start address of usable memory
320 * and at the end of the usable range downwards.
322 if (start >= max_low_pfn)
324 if (start < reserved_end)
325 start = reserved_end;
326 if (end > max_low_pfn)
330 * ... finally, is the area going away?
336 /* Register lowmem ranges */
337 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
338 memory_present(0, start, end);
342 * Reserve the bootmap memory.
344 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
347 * Reserve initrd memory if needed.
352 #endif /* CONFIG_SGI_IP27 */
355 * arch_mem_init - initialize memory managment subsystem
357 * o plat_mem_setup() detects the memory configuration and will record detected
358 * memory areas using add_memory_region.
360 * At this stage the memory configuration of the system is known to the
361 * kernel but generic memory managment system is still entirely uninitialized.
367 * At this stage the bootmem allocator is ready to use.
369 * NOTE: historically plat_mem_setup did the entire platform initialization.
370 * This was rather impractical because it meant plat_mem_setup had to
371 * get away without any kind of memory allocator. To keep old code from
372 * breaking plat_setup was just renamed to plat_setup and a second platform
373 * initialization hook for anything else was introduced.
376 static int usermem __initdata = 0;
378 static int __init early_parse_mem(char *p)
380 unsigned long start, size;
383 * If a user specifies memory size, we
384 * blow away any automatically generated
388 boot_mem_map.nr_map = 0;
392 size = memparse(p, &p);
394 start = memparse(p + 1, &p);
396 add_memory_region(start, size, BOOT_MEM_RAM);
399 early_param("mem", early_parse_mem);
401 static void __init arch_mem_init(char **cmdline_p)
403 extern void plat_mem_setup(void);
405 /* call board setup routine */
408 printk("Determined physical RAM map:\n");
411 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
412 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
414 *cmdline_p = command_line;
419 printk("User-defined physical RAM map:\n");
428 static void __init resource_init(void)
432 if (UNCAC_BASE != IO_BASE)
435 code_resource.start = __pa_symbol(&_text);
436 code_resource.end = __pa_symbol(&_etext) - 1;
437 data_resource.start = __pa_symbol(&_etext);
438 data_resource.end = __pa_symbol(&_edata) - 1;
441 * Request address space for all standard RAM.
443 for (i = 0; i < boot_mem_map.nr_map; i++) {
444 struct resource *res;
445 unsigned long start, end;
447 start = boot_mem_map.map[i].addr;
448 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
449 if (start >= HIGHMEM_START)
451 if (end >= HIGHMEM_START)
452 end = HIGHMEM_START - 1;
454 res = alloc_bootmem(sizeof(struct resource));
455 switch (boot_mem_map.map[i].type) {
457 case BOOT_MEM_ROM_DATA:
458 res->name = "System RAM";
460 case BOOT_MEM_RESERVED:
462 res->name = "reserved";
468 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
469 request_resource(&iomem_resource, res);
472 * We don't know which RAM region contains kernel data,
473 * so we try it repeatedly and let the resource manager
476 request_resource(res, &code_resource);
477 request_resource(res, &data_resource);
481 void __init setup_arch(char **cmdline_p)
487 #if defined(CONFIG_VT)
488 #if defined(CONFIG_VGA_CONSOLE)
489 conswitchp = &vga_con;
490 #elif defined(CONFIG_DUMMY_CONSOLE)
491 conswitchp = &dummy_con;
495 arch_mem_init(cmdline_p);
503 int __init fpu_disable(char *s)
507 for (i = 0; i < NR_CPUS; i++)
508 cpu_data[i].options &= ~MIPS_CPU_FPU;
513 __setup("nofpu", fpu_disable);
515 int __init dsp_disable(char *s)
517 cpu_data[0].ases &= ~MIPS_ASE_DSP;
522 __setup("nodsp", dsp_disable);