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/export.h>
16 #include <linux/screen_info.h>
17 #include <linux/memblock.h>
18 #include <linux/bootmem.h>
19 #include <linux/initrd.h>
20 #include <linux/root_dev.h>
21 #include <linux/highmem.h>
22 #include <linux/console.h>
23 #include <linux/pfn.h>
24 #include <linux/debugfs.h>
26 #include <asm/addrspace.h>
27 #include <asm/bootinfo.h>
29 #include <asm/cache.h>
31 #include <asm/sections.h>
32 #include <asm/setup.h>
33 #include <asm/smp-ops.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;
85 if (start + size < start) {
86 pr_warning("Trying to add an invalid memory region, skipped\n");
91 * Try to merge with existing entry, if any.
93 for (i = 0; i < boot_mem_map.nr_map; i++) {
94 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
97 if (entry->type != type)
100 if (start + size < entry->addr)
101 continue; /* no overlap */
103 if (entry->addr + entry->size < start)
104 continue; /* no overlap */
106 top = max(entry->addr + entry->size, start + size);
107 entry->addr = min(entry->addr, start);
108 entry->size = top - entry->addr;
113 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
114 pr_err("Ooops! Too many entries in the memory map!\n");
118 boot_mem_map.map[x].addr = start;
119 boot_mem_map.map[x].size = size;
120 boot_mem_map.map[x].type = type;
121 boot_mem_map.nr_map++;
124 static void __init print_memory_map(void)
127 const int field = 2 * sizeof(unsigned long);
129 for (i = 0; i < boot_mem_map.nr_map; i++) {
130 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
131 field, (unsigned long long) boot_mem_map.map[i].size,
132 field, (unsigned long long) boot_mem_map.map[i].addr);
134 switch (boot_mem_map.map[i].type) {
136 printk(KERN_CONT "(usable)\n");
138 case BOOT_MEM_INIT_RAM:
139 printk(KERN_CONT "(usable after init)\n");
141 case BOOT_MEM_ROM_DATA:
142 printk(KERN_CONT "(ROM data)\n");
144 case BOOT_MEM_RESERVED:
145 printk(KERN_CONT "(reserved)\n");
148 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
157 #ifdef CONFIG_BLK_DEV_INITRD
159 static int __init rd_start_early(char *p)
161 unsigned long start = memparse(p, &p);
164 /* Guess if the sign extension was forgotten by bootloader */
168 initrd_start = start;
172 early_param("rd_start", rd_start_early);
174 static int __init rd_size_early(char *p)
176 initrd_end += memparse(p, &p);
179 early_param("rd_size", rd_size_early);
181 /* it returns the next free pfn after initrd */
182 static unsigned long __init init_initrd(void)
187 * Board specific code or command line parser should have
188 * already set up initrd_start and initrd_end. In these cases
189 * perfom sanity checks and use them if all looks good.
191 if (!initrd_start || initrd_end <= initrd_start)
194 if (initrd_start & ~PAGE_MASK) {
195 pr_err("initrd start must be page aligned\n");
198 if (initrd_start < PAGE_OFFSET) {
199 pr_err("initrd start < PAGE_OFFSET\n");
204 * Sanitize initrd addresses. For example firmware
205 * can't guess if they need to pass them through
206 * 64-bits values if the kernel has been built in pure
207 * 32-bit. We need also to switch from KSEG0 to XKPHYS
208 * addresses now, so the code can now safely use __pa().
210 end = __pa(initrd_end);
211 initrd_end = (unsigned long)__va(end);
212 initrd_start = (unsigned long)__va(__pa(initrd_start));
214 ROOT_DEV = Root_RAM0;
222 static void __init finalize_initrd(void)
224 unsigned long size = initrd_end - initrd_start;
227 printk(KERN_INFO "Initrd not found or empty");
230 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
231 printk(KERN_ERR "Initrd extends beyond end of memory");
235 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
236 initrd_below_start_ok = 1;
238 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
242 printk(KERN_CONT " - disabling initrd\n");
247 #else /* !CONFIG_BLK_DEV_INITRD */
249 static unsigned long __init init_initrd(void)
254 #define finalize_initrd() do {} while (0)
259 * Initialize the bootmem allocator. It also setup initrd related data
262 #ifdef CONFIG_SGI_IP27
264 static void __init bootmem_init(void)
270 #else /* !CONFIG_SGI_IP27 */
272 static void __init bootmem_init(void)
274 unsigned long reserved_end;
275 unsigned long mapstart = ~0UL;
276 unsigned long bootmap_size;
280 * Init any data related to initrd. It's a nop if INITRD is
281 * not selected. Once that done we can determine the low bound
284 reserved_end = max(init_initrd(),
285 (unsigned long) PFN_UP(__pa_symbol(&_end)));
288 * max_low_pfn is not a number of pages. The number of pages
289 * of the system is given by 'max_low_pfn - min_low_pfn'.
295 * Find the highest page frame number we have available.
297 for (i = 0; i < boot_mem_map.nr_map; i++) {
298 unsigned long start, end;
300 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
303 start = PFN_UP(boot_mem_map.map[i].addr);
304 end = PFN_DOWN(boot_mem_map.map[i].addr
305 + boot_mem_map.map[i].size);
307 if (end > max_low_pfn)
309 if (start < min_low_pfn)
311 if (end <= reserved_end)
313 if (start >= mapstart)
315 mapstart = max(reserved_end, start);
318 if (min_low_pfn >= max_low_pfn)
319 panic("Incorrect memory mapping !!!");
320 if (min_low_pfn > ARCH_PFN_OFFSET) {
321 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
322 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
323 min_low_pfn - ARCH_PFN_OFFSET);
324 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
325 pr_info("%lu free pages won't be used\n",
326 ARCH_PFN_OFFSET - min_low_pfn);
328 min_low_pfn = ARCH_PFN_OFFSET;
331 * Determine low and high memory ranges
333 max_pfn = max_low_pfn;
334 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
335 #ifdef CONFIG_HIGHMEM
336 highstart_pfn = PFN_DOWN(HIGHMEM_START);
337 highend_pfn = max_low_pfn;
339 max_low_pfn = PFN_DOWN(HIGHMEM_START);
343 * Initialize the boot-time allocator with low memory only.
345 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
346 min_low_pfn, max_low_pfn);
349 for (i = 0; i < boot_mem_map.nr_map; i++) {
350 unsigned long start, end;
352 start = PFN_UP(boot_mem_map.map[i].addr);
353 end = PFN_DOWN(boot_mem_map.map[i].addr
354 + boot_mem_map.map[i].size);
356 if (start <= min_low_pfn)
361 #ifndef CONFIG_HIGHMEM
362 if (end > max_low_pfn)
366 * ... finally, is the area going away?
372 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
376 * Register fully available low RAM pages with the bootmem allocator.
378 for (i = 0; i < boot_mem_map.nr_map; i++) {
379 unsigned long start, end, size;
381 start = PFN_UP(boot_mem_map.map[i].addr);
382 end = PFN_DOWN(boot_mem_map.map[i].addr
383 + boot_mem_map.map[i].size);
386 * Reserve usable memory.
388 switch (boot_mem_map.map[i].type) {
391 case BOOT_MEM_INIT_RAM:
392 memory_present(0, start, end);
395 /* Not usable memory */
400 * We are rounding up the start address of usable memory
401 * and at the end of the usable range downwards.
403 if (start >= max_low_pfn)
405 if (start < reserved_end)
406 start = reserved_end;
407 if (end > max_low_pfn)
411 * ... finally, is the area going away?
417 /* Register lowmem ranges */
418 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
419 memory_present(0, start, end);
423 * Reserve the bootmap memory.
425 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
428 * Reserve initrd memory if needed.
433 #endif /* CONFIG_SGI_IP27 */
436 * arch_mem_init - initialize memory management subsystem
438 * o plat_mem_setup() detects the memory configuration and will record detected
439 * memory areas using add_memory_region.
441 * At this stage the memory configuration of the system is known to the
442 * kernel but generic memory management system is still entirely uninitialized.
448 * At this stage the bootmem allocator is ready to use.
450 * NOTE: historically plat_mem_setup did the entire platform initialization.
451 * This was rather impractical because it meant plat_mem_setup had to
452 * get away without any kind of memory allocator. To keep old code from
453 * breaking plat_setup was just renamed to plat_setup and a second platform
454 * initialization hook for anything else was introduced.
457 static int usermem __initdata;
459 static int __init early_parse_mem(char *p)
461 unsigned long start, size;
464 * If a user specifies memory size, we
465 * blow away any automatically generated
469 boot_mem_map.nr_map = 0;
473 size = memparse(p, &p);
475 start = memparse(p + 1, &p);
477 add_memory_region(start, size, BOOT_MEM_RAM);
480 early_param("mem", early_parse_mem);
482 static void __init arch_mem_init(char **cmdline_p)
484 phys_t init_mem, init_end, init_size;
486 extern void plat_mem_setup(void);
488 /* call board setup routine */
491 init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
492 init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
493 init_size = init_end - init_mem;
495 /* Make sure it is in the boot_mem_map */
498 for (i = 0; i < boot_mem_map.nr_map; i++) {
499 if (init_mem >= boot_mem_map.map[i].addr &&
500 init_mem < (boot_mem_map.map[i].addr +
501 boot_mem_map.map[i].size)) {
507 add_memory_region(init_mem, init_size,
511 pr_info("Determined physical RAM map:\n");
514 #ifdef CONFIG_CMDLINE_BOOL
515 #ifdef CONFIG_CMDLINE_OVERRIDE
516 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
518 if (builtin_cmdline[0]) {
519 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
520 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
522 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
525 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
527 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
529 *cmdline_p = command_line;
534 pr_info("User-defined physical RAM map:\n");
541 plat_swiotlb_setup();
545 static void __init resource_init(void)
549 if (UNCAC_BASE != IO_BASE)
552 code_resource.start = __pa_symbol(&_text);
553 code_resource.end = __pa_symbol(&_etext) - 1;
554 data_resource.start = __pa_symbol(&_etext);
555 data_resource.end = __pa_symbol(&_edata) - 1;
558 * Request address space for all standard RAM.
560 for (i = 0; i < boot_mem_map.nr_map; i++) {
561 struct resource *res;
562 unsigned long start, end;
564 start = boot_mem_map.map[i].addr;
565 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
566 if (start >= HIGHMEM_START)
568 if (end >= HIGHMEM_START)
569 end = HIGHMEM_START - 1;
571 res = alloc_bootmem(sizeof(struct resource));
572 switch (boot_mem_map.map[i].type) {
574 case BOOT_MEM_INIT_RAM:
575 case BOOT_MEM_ROM_DATA:
576 res->name = "System RAM";
578 case BOOT_MEM_RESERVED:
580 res->name = "reserved";
586 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
587 request_resource(&iomem_resource, res);
590 * We don't know which RAM region contains kernel data,
591 * so we try it repeatedly and let the resource manager
594 request_resource(res, &code_resource);
595 request_resource(res, &data_resource);
599 void __init setup_arch(char **cmdline_p)
604 #ifdef CONFIG_EARLY_PRINTK
605 setup_early_printk();
610 #if defined(CONFIG_VT)
611 #if defined(CONFIG_VGA_CONSOLE)
612 conswitchp = &vga_con;
613 #elif defined(CONFIG_DUMMY_CONSOLE)
614 conswitchp = &dummy_con;
618 arch_mem_init(cmdline_p);
626 unsigned long kernelsp[NR_CPUS];
627 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
629 #ifdef CONFIG_DEBUG_FS
630 struct dentry *mips_debugfs_dir;
631 static int __init debugfs_mips(void)
635 d = debugfs_create_dir("mips", NULL);
638 mips_debugfs_dir = d;
641 arch_initcall(debugfs_mips);