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>
35 struct cpuinfo_mips cpu_data
[NR_CPUS
] __read_mostly
;
37 EXPORT_SYMBOL(cpu_data
);
40 struct screen_info screen_info
;
44 * Despite it's name this variable is even if we don't have PCI
46 unsigned int PCI_DMA_BUS_IS_PHYS
;
48 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS
);
53 * These are initialized so they are in the .data section
55 unsigned long mips_machtype __read_mostly
= MACH_UNKNOWN
;
57 EXPORT_SYMBOL(mips_machtype
);
59 struct boot_mem_map boot_mem_map
;
61 static char command_line
[CL_SIZE
];
62 char arcs_cmdline
[CL_SIZE
]=CONFIG_CMDLINE
;
65 * mips_io_port_base is the begin of the address space to which x86 style
66 * I/O ports are mapped.
68 const unsigned long mips_io_port_base __read_mostly
= -1;
69 EXPORT_SYMBOL(mips_io_port_base
);
71 static struct resource code_resource
= { .name
= "Kernel code", };
72 static struct resource data_resource
= { .name
= "Kernel data", };
74 void __init
add_memory_region(phys_t start
, phys_t size
, long type
)
76 int x
= boot_mem_map
.nr_map
;
77 struct boot_mem_map_entry
*prev
= boot_mem_map
.map
+ x
- 1;
80 if (start
+ size
< start
) {
81 printk("Trying to add an invalid memory region, skipped\n");
86 * Try to merge with previous entry if any. This is far less than
87 * perfect but is sufficient for most real world cases.
89 if (x
&& prev
->addr
+ prev
->size
== start
&& prev
->type
== type
) {
94 if (x
== BOOT_MEM_MAP_MAX
) {
95 printk("Ooops! Too many entries in the memory map!\n");
99 boot_mem_map
.map
[x
].addr
= start
;
100 boot_mem_map
.map
[x
].size
= size
;
101 boot_mem_map
.map
[x
].type
= type
;
102 boot_mem_map
.nr_map
++;
105 static void __init
print_memory_map(void)
108 const int field
= 2 * sizeof(unsigned long);
110 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
111 printk(" memory: %0*Lx @ %0*Lx ",
112 field
, (unsigned long long) boot_mem_map
.map
[i
].size
,
113 field
, (unsigned long long) boot_mem_map
.map
[i
].addr
);
115 switch (boot_mem_map
.map
[i
].type
) {
117 printk("(usable)\n");
119 case BOOT_MEM_ROM_DATA
:
120 printk("(ROM data)\n");
122 case BOOT_MEM_RESERVED
:
123 printk("(reserved)\n");
126 printk("type %lu\n", boot_mem_map
.map
[i
].type
);
135 #ifdef CONFIG_BLK_DEV_INITRD
137 static int __init
rd_start_early(char *p
)
139 unsigned long start
= memparse(p
, &p
);
142 /* Guess if the sign extension was forgotten by bootloader */
146 initrd_start
= start
;
150 early_param("rd_start", rd_start_early
);
152 static int __init
rd_size_early(char *p
)
154 initrd_end
+= memparse(p
, &p
);
157 early_param("rd_size", rd_size_early
);
159 /* it returns the next free pfn after initrd */
160 static unsigned long __init
init_initrd(void)
166 * Board specific code or command line parser should have
167 * already set up initrd_start and initrd_end. In these cases
168 * perfom sanity checks and use them if all looks good.
170 if (initrd_start
&& initrd_end
> initrd_start
)
174 * See if initrd has been added to the kernel image by
175 * arch/mips/boot/addinitrd.c. In that case a header is
176 * prepended to initrd and is made up by 8 bytes. The fisrt
177 * word is a magic number and the second one is the size of
178 * initrd. Initrd start must be page aligned in any cases.
180 initrd_header
= __va(PAGE_ALIGN(__pa_symbol(&_end
) + 8)) - 8;
181 if (initrd_header
[0] != 0x494E5244)
183 initrd_start
= (unsigned long)(initrd_header
+ 2);
184 initrd_end
= initrd_start
+ initrd_header
[1];
187 if (initrd_start
& ~PAGE_MASK
) {
188 printk(KERN_ERR
"initrd start must be page aligned\n");
191 if (initrd_start
< PAGE_OFFSET
) {
192 printk(KERN_ERR
"initrd start < PAGE_OFFSET\n");
197 * Sanitize initrd addresses. For example firmware
198 * can't guess if they need to pass them through
199 * 64-bits values if the kernel has been built in pure
200 * 32-bit. We need also to switch from KSEG0 to XKPHYS
201 * addresses now, so the code can now safely use __pa().
203 end
= __pa(initrd_end
);
204 initrd_end
= (unsigned long)__va(end
);
205 initrd_start
= (unsigned long)__va(__pa(initrd_start
));
207 ROOT_DEV
= Root_RAM0
;
215 static void __init
finalize_initrd(void)
217 unsigned long size
= initrd_end
- initrd_start
;
220 printk(KERN_INFO
"Initrd not found or empty");
223 if (__pa(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
224 printk("Initrd extends beyond end of memory");
228 reserve_bootmem(__pa(initrd_start
), size
, BOOTMEM_DEFAULT
);
229 initrd_below_start_ok
= 1;
231 printk(KERN_INFO
"Initial ramdisk at: 0x%lx (%lu bytes)\n",
235 printk(" - disabling initrd\n");
240 #else /* !CONFIG_BLK_DEV_INITRD */
242 static unsigned long __init
init_initrd(void)
247 #define finalize_initrd() do {} while (0)
252 * Initialize the bootmem allocator. It also setup initrd related data
255 #ifdef CONFIG_SGI_IP27
257 static void __init
bootmem_init(void)
263 #else /* !CONFIG_SGI_IP27 */
265 static void __init
bootmem_init(void)
267 unsigned long reserved_end
;
268 unsigned long mapstart
= ~0UL;
269 unsigned long bootmap_size
;
273 * Init any data related to initrd. It's a nop if INITRD is
274 * not selected. Once that done we can determine the low bound
277 reserved_end
= max(init_initrd(), PFN_UP(__pa_symbol(&_end
)));
280 * max_low_pfn is not a number of pages. The number of pages
281 * of the system is given by 'max_low_pfn - min_low_pfn'.
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
);
299 if (end
> max_low_pfn
)
301 if (start
< min_low_pfn
)
303 if (end
<= reserved_end
)
305 if (start
>= mapstart
)
307 mapstart
= max(reserved_end
, start
);
310 if (min_low_pfn
>= max_low_pfn
)
311 panic("Incorrect memory mapping !!!");
312 if (min_low_pfn
> ARCH_PFN_OFFSET
) {
314 "Wasting %lu bytes for tracking %lu unused pages\n",
315 (min_low_pfn
- ARCH_PFN_OFFSET
) * sizeof(struct page
),
316 min_low_pfn
- ARCH_PFN_OFFSET
);
317 } else if (min_low_pfn
< ARCH_PFN_OFFSET
) {
319 "%lu free pages won't be used\n",
320 ARCH_PFN_OFFSET
- min_low_pfn
);
322 min_low_pfn
= ARCH_PFN_OFFSET
;
325 * Determine low and high memory ranges
327 max_pfn
= max_low_pfn
;
328 if (max_low_pfn
> PFN_DOWN(HIGHMEM_START
)) {
329 #ifdef CONFIG_HIGHMEM
330 highstart_pfn
= PFN_DOWN(HIGHMEM_START
);
331 highend_pfn
= max_low_pfn
;
333 max_low_pfn
= PFN_DOWN(HIGHMEM_START
);
337 * Initialize the boot-time allocator with low memory only.
339 bootmap_size
= init_bootmem_node(NODE_DATA(0), mapstart
,
340 min_low_pfn
, max_low_pfn
);
343 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
344 unsigned long start
, end
;
346 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
347 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
348 + boot_mem_map
.map
[i
].size
);
350 if (start
<= min_low_pfn
)
355 #ifndef CONFIG_HIGHMEM
356 if (end
> max_low_pfn
)
360 * ... finally, is the area going away?
366 add_active_range(0, start
, end
);
370 * Register fully available low RAM pages with the bootmem allocator.
372 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
373 unsigned long start
, end
, size
;
376 * Reserve usable memory.
378 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
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
);
385 * We are rounding up the start address of usable memory
386 * and at the end of the usable range downwards.
388 if (start
>= max_low_pfn
)
390 if (start
< reserved_end
)
391 start
= reserved_end
;
392 if (end
> max_low_pfn
)
396 * ... finally, is the area going away?
402 /* Register lowmem ranges */
403 free_bootmem(PFN_PHYS(start
), size
<< PAGE_SHIFT
);
404 memory_present(0, start
, end
);
408 * Reserve the bootmap memory.
410 reserve_bootmem(PFN_PHYS(mapstart
), bootmap_size
, BOOTMEM_DEFAULT
);
413 * Reserve initrd memory if needed.
418 #endif /* CONFIG_SGI_IP27 */
421 * arch_mem_init - initialize memory management subsystem
423 * o plat_mem_setup() detects the memory configuration and will record detected
424 * memory areas using add_memory_region.
426 * At this stage the memory configuration of the system is known to the
427 * kernel but generic memory management system is still entirely uninitialized.
433 * At this stage the bootmem allocator is ready to use.
435 * NOTE: historically plat_mem_setup did the entire platform initialization.
436 * This was rather impractical because it meant plat_mem_setup had to
437 * get away without any kind of memory allocator. To keep old code from
438 * breaking plat_setup was just renamed to plat_setup and a second platform
439 * initialization hook for anything else was introduced.
442 static int usermem __initdata
= 0;
444 static int __init
early_parse_mem(char *p
)
446 unsigned long start
, size
;
449 * If a user specifies memory size, we
450 * blow away any automatically generated
454 boot_mem_map
.nr_map
= 0;
458 size
= memparse(p
, &p
);
460 start
= memparse(p
+ 1, &p
);
462 add_memory_region(start
, size
, BOOT_MEM_RAM
);
465 early_param("mem", early_parse_mem
);
467 static void __init
arch_mem_init(char **cmdline_p
)
469 extern void plat_mem_setup(void);
471 /* call board setup routine */
474 printk("Determined physical RAM map:\n");
477 strlcpy(command_line
, arcs_cmdline
, sizeof(command_line
));
478 strlcpy(boot_command_line
, command_line
, COMMAND_LINE_SIZE
);
480 *cmdline_p
= command_line
;
485 printk("User-defined physical RAM map:\n");
494 static void __init
resource_init(void)
498 if (UNCAC_BASE
!= IO_BASE
)
501 code_resource
.start
= __pa_symbol(&_text
);
502 code_resource
.end
= __pa_symbol(&_etext
) - 1;
503 data_resource
.start
= __pa_symbol(&_etext
);
504 data_resource
.end
= __pa_symbol(&_edata
) - 1;
507 * Request address space for all standard RAM.
509 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
510 struct resource
*res
;
511 unsigned long start
, end
;
513 start
= boot_mem_map
.map
[i
].addr
;
514 end
= boot_mem_map
.map
[i
].addr
+ boot_mem_map
.map
[i
].size
- 1;
515 if (start
>= HIGHMEM_START
)
517 if (end
>= HIGHMEM_START
)
518 end
= HIGHMEM_START
- 1;
520 res
= alloc_bootmem(sizeof(struct resource
));
521 switch (boot_mem_map
.map
[i
].type
) {
523 case BOOT_MEM_ROM_DATA
:
524 res
->name
= "System RAM";
526 case BOOT_MEM_RESERVED
:
528 res
->name
= "reserved";
534 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
535 request_resource(&iomem_resource
, res
);
538 * We don't know which RAM region contains kernel data,
539 * so we try it repeatedly and let the resource manager
542 request_resource(res
, &code_resource
);
543 request_resource(res
, &data_resource
);
547 void __init
setup_arch(char **cmdline_p
)
552 #ifdef CONFIG_EARLY_PRINTK
553 setup_early_printk();
558 #if defined(CONFIG_VT)
559 #if defined(CONFIG_VGA_CONSOLE)
560 conswitchp
= &vga_con
;
561 #elif defined(CONFIG_DUMMY_CONSOLE)
562 conswitchp
= &dummy_con
;
566 arch_mem_init(cmdline_p
);
572 static int __init
fpu_disable(char *s
)
576 for (i
= 0; i
< NR_CPUS
; i
++)
577 cpu_data
[i
].options
&= ~MIPS_CPU_FPU
;
582 __setup("nofpu", fpu_disable
);
584 static int __init
dsp_disable(char *s
)
586 cpu_data
[0].ases
&= ~MIPS_ASE_DSP
;
591 __setup("nodsp", dsp_disable
);
593 unsigned long kernelsp
[NR_CPUS
];
594 unsigned long fw_arg0
, fw_arg1
, fw_arg2
, fw_arg3
;
596 #ifdef CONFIG_DEBUG_FS
597 struct dentry
*mips_debugfs_dir
;
598 static int __init
debugfs_mips(void)
602 d
= debugfs_create_dir("mips", NULL
);
605 mips_debugfs_dir
= d
;
608 arch_initcall(debugfs_mips
);