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, 2007 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>
23 #include <linux/debugfs.h>
25 #include <asm/addrspace.h>
26 #include <asm/bootinfo.h>
28 #include <asm/cache.h>
30 #include <asm/sections.h>
31 #include <asm/setup.h>
32 #include <asm/smp-ops.h>
33 #include <asm/system.h>
36 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
38 EXPORT_SYMBOL(cpu_data);
41 struct screen_info screen_info;
45 * Despite it's name this variable is even if we don't have PCI
47 unsigned int PCI_DMA_BUS_IS_PHYS;
49 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
54 * These are initialized so they are in the .data section
56 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
58 EXPORT_SYMBOL(mips_machtype);
60 struct boot_mem_map boot_mem_map;
62 static char __initdata command_line[COMMAND_LINE_SIZE];
63 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
65 #ifdef CONFIG_CMDLINE_BOOL
66 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
70 * mips_io_port_base is the begin of the address space to which x86 style
71 * I/O ports are mapped.
73 const unsigned long mips_io_port_base = -1;
74 EXPORT_SYMBOL(mips_io_port_base);
76 static struct resource code_resource = { .name = "Kernel code", };
77 static struct resource data_resource = { .name = "Kernel data", };
79 void __init add_memory_region(phys_t start, phys_t size, long type)
81 int x = boot_mem_map.nr_map;
82 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
85 if (start + size < start) {
86 pr_warning("Trying to add an invalid memory region, skipped\n");
91 * Try to merge with previous entry if any. This is far less than
92 * perfect but is sufficient for most real world cases.
94 if (x && prev->addr + prev->size == start && prev->type == type) {
99 if (x == BOOT_MEM_MAP_MAX) {
100 pr_err("Ooops! Too many entries in the memory map!\n");
104 boot_mem_map.map[x].addr = start;
105 boot_mem_map.map[x].size = size;
106 boot_mem_map.map[x].type = type;
107 boot_mem_map.nr_map++;
110 static void __init print_memory_map(void)
113 const int field = 2 * sizeof(unsigned long);
115 for (i = 0; i < boot_mem_map.nr_map; i++) {
116 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
117 field, (unsigned long long) boot_mem_map.map[i].size,
118 field, (unsigned long long) boot_mem_map.map[i].addr);
120 switch (boot_mem_map.map[i].type) {
122 printk(KERN_CONT "(usable)\n");
124 case BOOT_MEM_ROM_DATA:
125 printk(KERN_CONT "(ROM data)\n");
127 case BOOT_MEM_RESERVED:
128 printk(KERN_CONT "(reserved)\n");
131 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
140 #ifdef CONFIG_BLK_DEV_INITRD
142 static int __init rd_start_early(char *p)
144 unsigned long start = memparse(p, &p);
147 /* Guess if the sign extension was forgotten by bootloader */
151 initrd_start = start;
155 early_param("rd_start", rd_start_early);
157 static int __init rd_size_early(char *p)
159 initrd_end += memparse(p, &p);
162 early_param("rd_size", rd_size_early);
164 /* it returns the next free pfn after initrd */
165 static unsigned long __init init_initrd(void)
170 * Board specific code or command line parser should have
171 * already set up initrd_start and initrd_end. In these cases
172 * perfom sanity checks and use them if all looks good.
174 if (!initrd_start || initrd_end <= initrd_start)
177 if (initrd_start & ~PAGE_MASK) {
178 pr_err("initrd start must be page aligned\n");
181 if (initrd_start < PAGE_OFFSET) {
182 pr_err("initrd start < PAGE_OFFSET\n");
187 * Sanitize initrd addresses. For example firmware
188 * can't guess if they need to pass them through
189 * 64-bits values if the kernel has been built in pure
190 * 32-bit. We need also to switch from KSEG0 to XKPHYS
191 * addresses now, so the code can now safely use __pa().
193 end = __pa(initrd_end);
194 initrd_end = (unsigned long)__va(end);
195 initrd_start = (unsigned long)__va(__pa(initrd_start));
197 ROOT_DEV = Root_RAM0;
205 static void __init finalize_initrd(void)
207 unsigned long size = initrd_end - initrd_start;
210 printk(KERN_INFO "Initrd not found or empty");
213 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
214 printk(KERN_ERR "Initrd extends beyond end of memory");
218 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
219 initrd_below_start_ok = 1;
221 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
225 printk(KERN_CONT " - disabling initrd\n");
230 #else /* !CONFIG_BLK_DEV_INITRD */
232 static unsigned long __init init_initrd(void)
237 #define finalize_initrd() do {} while (0)
242 * Initialize the bootmem allocator. It also setup initrd related data
245 #ifdef CONFIG_SGI_IP27
247 static void __init bootmem_init(void)
253 #else /* !CONFIG_SGI_IP27 */
255 static void __init bootmem_init(void)
257 unsigned long reserved_end;
258 unsigned long mapstart = ~0UL;
259 unsigned long bootmap_size;
263 * Init any data related to initrd. It's a nop if INITRD is
264 * not selected. Once that done we can determine the low bound
267 reserved_end = max(init_initrd(),
268 (unsigned long) PFN_UP(__pa_symbol(&_end)));
271 * max_low_pfn is not a number of pages. The number of pages
272 * of the system is given by 'max_low_pfn - min_low_pfn'.
278 * Find the highest page frame number we have available.
280 for (i = 0; i < boot_mem_map.nr_map; i++) {
281 unsigned long start, end;
283 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
286 start = PFN_UP(boot_mem_map.map[i].addr);
287 end = PFN_DOWN(boot_mem_map.map[i].addr
288 + boot_mem_map.map[i].size);
290 if (end > max_low_pfn)
292 if (start < min_low_pfn)
294 if (end <= reserved_end)
296 if (start >= mapstart)
298 mapstart = max(reserved_end, start);
301 if (min_low_pfn >= max_low_pfn)
302 panic("Incorrect memory mapping !!!");
303 if (min_low_pfn > ARCH_PFN_OFFSET) {
304 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
305 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
306 min_low_pfn - ARCH_PFN_OFFSET);
307 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
308 pr_info("%lu free pages won't be used\n",
309 ARCH_PFN_OFFSET - min_low_pfn);
311 min_low_pfn = ARCH_PFN_OFFSET;
314 * Determine low and high memory ranges
316 max_pfn = max_low_pfn;
317 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
318 #ifdef CONFIG_HIGHMEM
319 highstart_pfn = PFN_DOWN(HIGHMEM_START);
320 highend_pfn = max_low_pfn;
322 max_low_pfn = PFN_DOWN(HIGHMEM_START);
326 * Initialize the boot-time allocator with low memory only.
328 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
329 min_low_pfn, max_low_pfn);
332 for (i = 0; i < boot_mem_map.nr_map; i++) {
333 unsigned long start, end;
335 start = PFN_UP(boot_mem_map.map[i].addr);
336 end = PFN_DOWN(boot_mem_map.map[i].addr
337 + boot_mem_map.map[i].size);
339 if (start <= min_low_pfn)
344 #ifndef CONFIG_HIGHMEM
345 if (end > max_low_pfn)
349 * ... finally, is the area going away?
355 add_active_range(0, start, end);
359 * Register fully available low RAM pages with the bootmem allocator.
361 for (i = 0; i < boot_mem_map.nr_map; i++) {
362 unsigned long start, end, size;
365 * Reserve usable memory.
367 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
370 start = PFN_UP(boot_mem_map.map[i].addr);
371 end = PFN_DOWN(boot_mem_map.map[i].addr
372 + boot_mem_map.map[i].size);
374 * We are rounding up the start address of usable memory
375 * and at the end of the usable range downwards.
377 if (start >= max_low_pfn)
379 if (start < reserved_end)
380 start = reserved_end;
381 if (end > max_low_pfn)
385 * ... finally, is the area going away?
391 /* Register lowmem ranges */
392 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
393 memory_present(0, start, end);
397 * Reserve the bootmap memory.
399 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
402 * Reserve initrd memory if needed.
407 #endif /* CONFIG_SGI_IP27 */
410 * arch_mem_init - initialize memory management subsystem
412 * o plat_mem_setup() detects the memory configuration and will record detected
413 * memory areas using add_memory_region.
415 * At this stage the memory configuration of the system is known to the
416 * kernel but generic memory management system is still entirely uninitialized.
422 * At this stage the bootmem allocator is ready to use.
424 * NOTE: historically plat_mem_setup did the entire platform initialization.
425 * This was rather impractical because it meant plat_mem_setup had to
426 * get away without any kind of memory allocator. To keep old code from
427 * breaking plat_setup was just renamed to plat_setup and a second platform
428 * initialization hook for anything else was introduced.
431 static int usermem __initdata;
433 static int __init early_parse_mem(char *p)
435 unsigned long start, size;
438 * If a user specifies memory size, we
439 * blow away any automatically generated
443 boot_mem_map.nr_map = 0;
447 size = memparse(p, &p);
449 start = memparse(p + 1, &p);
451 add_memory_region(start, size, BOOT_MEM_RAM);
454 early_param("mem", early_parse_mem);
456 static void __init arch_mem_init(char **cmdline_p)
458 extern void plat_mem_setup(void);
460 /* call board setup routine */
463 pr_info("Determined physical RAM map:\n");
466 #ifdef CONFIG_CMDLINE_BOOL
467 #ifdef CONFIG_CMDLINE_OVERRIDE
468 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
470 if (builtin_cmdline[0]) {
471 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
472 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
474 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
477 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
479 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
481 *cmdline_p = command_line;
486 pr_info("User-defined physical RAM map:\n");
493 plat_swiotlb_setup();
497 static void __init resource_init(void)
501 if (UNCAC_BASE != IO_BASE)
504 code_resource.start = __pa_symbol(&_text);
505 code_resource.end = __pa_symbol(&_etext) - 1;
506 data_resource.start = __pa_symbol(&_etext);
507 data_resource.end = __pa_symbol(&_edata) - 1;
510 * Request address space for all standard RAM.
512 for (i = 0; i < boot_mem_map.nr_map; i++) {
513 struct resource *res;
514 unsigned long start, end;
516 start = boot_mem_map.map[i].addr;
517 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
518 if (start >= HIGHMEM_START)
520 if (end >= HIGHMEM_START)
521 end = HIGHMEM_START - 1;
523 res = alloc_bootmem(sizeof(struct resource));
524 switch (boot_mem_map.map[i].type) {
526 case BOOT_MEM_ROM_DATA:
527 res->name = "System RAM";
529 case BOOT_MEM_RESERVED:
531 res->name = "reserved";
537 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
538 request_resource(&iomem_resource, res);
541 * We don't know which RAM region contains kernel data,
542 * so we try it repeatedly and let the resource manager
545 request_resource(res, &code_resource);
546 request_resource(res, &data_resource);
550 void __init setup_arch(char **cmdline_p)
555 #ifdef CONFIG_EARLY_PRINTK
556 setup_early_printk();
561 #if defined(CONFIG_VT)
562 #if defined(CONFIG_VGA_CONSOLE)
563 conswitchp = &vga_con;
564 #elif defined(CONFIG_DUMMY_CONSOLE)
565 conswitchp = &dummy_con;
569 arch_mem_init(cmdline_p);
575 unsigned long kernelsp[NR_CPUS];
576 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
578 #ifdef CONFIG_DEBUG_FS
579 struct dentry *mips_debugfs_dir;
580 static int __init debugfs_mips(void)
584 d = debugfs_create_dir("mips", NULL);
587 mips_debugfs_dir = d;
590 arch_initcall(debugfs_mips);