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 /* Guess if the sign extension was forgotten by bootloader */
152 initrd_start = start;
156 early_param("rd_start", rd_start_early);
158 static int __init rd_size_early(char *p)
160 initrd_end += memparse(p, &p);
163 early_param("rd_size", rd_size_early);
165 /* it returns the next free pfn after initrd */
166 static unsigned long __init init_initrd(void)
172 * Board specific code or command line parser should have
173 * already set up initrd_start and initrd_end. In these cases
174 * perfom sanity checks and use them if all looks good.
176 if (initrd_start && initrd_end > initrd_start)
180 * See if initrd has been added to the kernel image by
181 * arch/mips/boot/addinitrd.c. In that case a header is
182 * prepended to initrd and is made up by 8 bytes. The fisrt
183 * word is a magic number and the second one is the size of
184 * initrd. Initrd start must be page aligned in any cases.
186 initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
187 if (initrd_header[0] != 0x494E5244)
189 initrd_start = (unsigned long)(initrd_header + 2);
190 initrd_end = initrd_start + initrd_header[1];
193 if (initrd_start & ~PAGE_MASK) {
194 printk(KERN_ERR "initrd start must be page aligned\n");
197 if (initrd_start < PAGE_OFFSET) {
198 printk(KERN_ERR "initrd start < PAGE_OFFSET\n");
203 * Sanitize initrd addresses. For example firmware
204 * can't guess if they need to pass them through
205 * 64-bits values if the kernel has been built in pure
206 * 32-bit. We need also to switch from KSEG0 to XKPHYS
207 * addresses now, so the code can now safely use __pa().
209 end = __pa(initrd_end);
210 initrd_end = (unsigned long)__va(end);
211 initrd_start = (unsigned long)__va(__pa(initrd_start));
213 ROOT_DEV = Root_RAM0;
221 static void __init finalize_initrd(void)
223 unsigned long size = initrd_end - initrd_start;
226 printk(KERN_INFO "Initrd not found or empty");
229 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
230 printk("Initrd extends beyond end of memory");
234 reserve_bootmem(__pa(initrd_start), size);
235 initrd_below_start_ok = 1;
237 printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
241 printk(" - disabling initrd\n");
246 #else /* !CONFIG_BLK_DEV_INITRD */
248 static unsigned long __init init_initrd(void)
253 #define finalize_initrd() do {} while (0)
258 * Initialize the bootmem allocator. It also setup initrd related data
261 #ifdef CONFIG_SGI_IP27
263 static void __init bootmem_init(void)
269 #else /* !CONFIG_SGI_IP27 */
271 static void __init bootmem_init(void)
273 unsigned long reserved_end;
274 unsigned long highest = 0;
275 unsigned long mapstart = -1UL;
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(), PFN_UP(__pa_symbol(&_end)));
287 * Find the highest page frame number we have available.
289 for (i = 0; i < boot_mem_map.nr_map; i++) {
290 unsigned long start, end;
292 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
295 start = PFN_UP(boot_mem_map.map[i].addr);
296 end = PFN_DOWN(boot_mem_map.map[i].addr
297 + boot_mem_map.map[i].size);
301 if (end <= reserved_end)
303 if (start >= mapstart)
305 mapstart = max(reserved_end, start);
309 * Determine low and high memory ranges
311 if (highest > PFN_DOWN(HIGHMEM_START)) {
312 #ifdef CONFIG_HIGHMEM
313 highstart_pfn = PFN_DOWN(HIGHMEM_START);
314 highend_pfn = highest;
316 highest = PFN_DOWN(HIGHMEM_START);
320 * Initialize the boot-time allocator with low memory only.
322 bootmap_size = init_bootmem(mapstart, highest);
325 * Register fully available low RAM pages with the bootmem allocator.
327 for (i = 0; i < boot_mem_map.nr_map; i++) {
328 unsigned long start, end, size;
331 * Reserve usable memory.
333 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
336 start = PFN_UP(boot_mem_map.map[i].addr);
337 end = PFN_DOWN(boot_mem_map.map[i].addr
338 + boot_mem_map.map[i].size);
340 * We are rounding up the start address of usable memory
341 * and at the end of the usable range downwards.
343 if (start >= max_low_pfn)
345 if (start < reserved_end)
346 start = reserved_end;
347 if (end > max_low_pfn)
351 * ... finally, is the area going away?
357 /* Register lowmem ranges */
358 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
359 memory_present(0, start, end);
363 * Reserve the bootmap memory.
365 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
368 * Reserve initrd memory if needed.
373 #endif /* CONFIG_SGI_IP27 */
376 * arch_mem_init - initialize memory managment subsystem
378 * o plat_mem_setup() detects the memory configuration and will record detected
379 * memory areas using add_memory_region.
381 * At this stage the memory configuration of the system is known to the
382 * kernel but generic memory managment system is still entirely uninitialized.
388 * At this stage the bootmem allocator is ready to use.
390 * NOTE: historically plat_mem_setup did the entire platform initialization.
391 * This was rather impractical because it meant plat_mem_setup had to
392 * get away without any kind of memory allocator. To keep old code from
393 * breaking plat_setup was just renamed to plat_setup and a second platform
394 * initialization hook for anything else was introduced.
397 static int usermem __initdata = 0;
399 static int __init early_parse_mem(char *p)
401 unsigned long start, size;
404 * If a user specifies memory size, we
405 * blow away any automatically generated
409 boot_mem_map.nr_map = 0;
413 size = memparse(p, &p);
415 start = memparse(p + 1, &p);
417 add_memory_region(start, size, BOOT_MEM_RAM);
420 early_param("mem", early_parse_mem);
422 static void __init arch_mem_init(char **cmdline_p)
424 extern void plat_mem_setup(void);
426 /* call board setup routine */
429 printk("Determined physical RAM map:\n");
432 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
433 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
435 *cmdline_p = command_line;
440 printk("User-defined physical RAM map:\n");
449 static void __init resource_init(void)
453 if (UNCAC_BASE != IO_BASE)
456 code_resource.start = __pa_symbol(&_text);
457 code_resource.end = __pa_symbol(&_etext) - 1;
458 data_resource.start = __pa_symbol(&_etext);
459 data_resource.end = __pa_symbol(&_edata) - 1;
462 * Request address space for all standard RAM.
464 for (i = 0; i < boot_mem_map.nr_map; i++) {
465 struct resource *res;
466 unsigned long start, end;
468 start = boot_mem_map.map[i].addr;
469 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
470 if (start >= HIGHMEM_START)
472 if (end >= HIGHMEM_START)
473 end = HIGHMEM_START - 1;
475 res = alloc_bootmem(sizeof(struct resource));
476 switch (boot_mem_map.map[i].type) {
478 case BOOT_MEM_ROM_DATA:
479 res->name = "System RAM";
481 case BOOT_MEM_RESERVED:
483 res->name = "reserved";
489 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
490 request_resource(&iomem_resource, res);
493 * We don't know which RAM region contains kernel data,
494 * so we try it repeatedly and let the resource manager
497 request_resource(res, &code_resource);
498 request_resource(res, &data_resource);
502 void __init setup_arch(char **cmdline_p)
508 #if defined(CONFIG_VT)
509 #if defined(CONFIG_VGA_CONSOLE)
510 conswitchp = &vga_con;
511 #elif defined(CONFIG_DUMMY_CONSOLE)
512 conswitchp = &dummy_con;
516 arch_mem_init(cmdline_p);
524 int __init fpu_disable(char *s)
528 for (i = 0; i < NR_CPUS; i++)
529 cpu_data[i].options &= ~MIPS_CPU_FPU;
534 __setup("nofpu", fpu_disable);
536 int __init dsp_disable(char *s)
538 cpu_data[0].ases &= ~MIPS_ASE_DSP;
543 __setup("nodsp", dsp_disable);