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>
25 #include <linux/kexec.h>
27 #include <asm/addrspace.h>
28 #include <asm/bootinfo.h>
30 #include <asm/cache.h>
32 #include <asm/sections.h>
33 #include <asm/setup.h>
34 #include <asm/smp-ops.h>
37 struct cpuinfo_mips cpu_data
[NR_CPUS
] __read_mostly
;
39 EXPORT_SYMBOL(cpu_data
);
42 struct screen_info screen_info
;
46 * Despite it's name this variable is even if we don't have PCI
48 unsigned int PCI_DMA_BUS_IS_PHYS
;
50 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS
);
55 * These are initialized so they are in the .data section
57 unsigned long mips_machtype __read_mostly
= MACH_UNKNOWN
;
59 EXPORT_SYMBOL(mips_machtype
);
61 struct boot_mem_map boot_mem_map
;
63 static char __initdata command_line
[COMMAND_LINE_SIZE
];
64 char __initdata arcs_cmdline
[COMMAND_LINE_SIZE
];
66 #ifdef CONFIG_CMDLINE_BOOL
67 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
71 * mips_io_port_base is the begin of the address space to which x86 style
72 * I/O ports are mapped.
74 const unsigned long mips_io_port_base
= -1;
75 EXPORT_SYMBOL(mips_io_port_base
);
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
;
86 if (start
+ size
< start
) {
87 pr_warning("Trying to add an invalid memory region, skipped\n");
92 * Try to merge with existing entry, if any.
94 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
95 struct boot_mem_map_entry
*entry
= boot_mem_map
.map
+ i
;
98 if (entry
->type
!= type
)
101 if (start
+ size
< entry
->addr
)
102 continue; /* no overlap */
104 if (entry
->addr
+ entry
->size
< start
)
105 continue; /* no overlap */
107 top
= max(entry
->addr
+ entry
->size
, start
+ size
);
108 entry
->addr
= min(entry
->addr
, start
);
109 entry
->size
= top
- entry
->addr
;
114 if (boot_mem_map
.nr_map
== BOOT_MEM_MAP_MAX
) {
115 pr_err("Ooops! Too many entries in the memory map!\n");
119 boot_mem_map
.map
[x
].addr
= start
;
120 boot_mem_map
.map
[x
].size
= size
;
121 boot_mem_map
.map
[x
].type
= type
;
122 boot_mem_map
.nr_map
++;
125 static void __init
print_memory_map(void)
128 const int field
= 2 * sizeof(unsigned long);
130 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
131 printk(KERN_INFO
" memory: %0*Lx @ %0*Lx ",
132 field
, (unsigned long long) boot_mem_map
.map
[i
].size
,
133 field
, (unsigned long long) boot_mem_map
.map
[i
].addr
);
135 switch (boot_mem_map
.map
[i
].type
) {
137 printk(KERN_CONT
"(usable)\n");
139 case BOOT_MEM_INIT_RAM
:
140 printk(KERN_CONT
"(usable after init)\n");
142 case BOOT_MEM_ROM_DATA
:
143 printk(KERN_CONT
"(ROM data)\n");
145 case BOOT_MEM_RESERVED
:
146 printk(KERN_CONT
"(reserved)\n");
149 printk(KERN_CONT
"type %lu\n", boot_mem_map
.map
[i
].type
);
158 #ifdef CONFIG_BLK_DEV_INITRD
160 static int __init
rd_start_early(char *p
)
162 unsigned long start
= memparse(p
, &p
);
165 /* Guess if the sign extension was forgotten by bootloader */
169 initrd_start
= start
;
173 early_param("rd_start", rd_start_early
);
175 static int __init
rd_size_early(char *p
)
177 initrd_end
+= memparse(p
, &p
);
180 early_param("rd_size", rd_size_early
);
182 /* it returns the next free pfn after initrd */
183 static unsigned long __init
init_initrd(void)
188 * Board specific code or command line parser should have
189 * already set up initrd_start and initrd_end. In these cases
190 * perfom sanity checks and use them if all looks good.
192 if (!initrd_start
|| initrd_end
<= initrd_start
)
195 if (initrd_start
& ~PAGE_MASK
) {
196 pr_err("initrd start must be page aligned\n");
199 if (initrd_start
< PAGE_OFFSET
) {
200 pr_err("initrd start < PAGE_OFFSET\n");
205 * Sanitize initrd addresses. For example firmware
206 * can't guess if they need to pass them through
207 * 64-bits values if the kernel has been built in pure
208 * 32-bit. We need also to switch from KSEG0 to XKPHYS
209 * addresses now, so the code can now safely use __pa().
211 end
= __pa(initrd_end
);
212 initrd_end
= (unsigned long)__va(end
);
213 initrd_start
= (unsigned long)__va(__pa(initrd_start
));
215 ROOT_DEV
= Root_RAM0
;
223 static void __init
finalize_initrd(void)
225 unsigned long size
= initrd_end
- initrd_start
;
228 printk(KERN_INFO
"Initrd not found or empty");
231 if (__pa(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
232 printk(KERN_ERR
"Initrd extends beyond end of memory");
236 reserve_bootmem(__pa(initrd_start
), size
, BOOTMEM_DEFAULT
);
237 initrd_below_start_ok
= 1;
239 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
243 printk(KERN_CONT
" - disabling initrd\n");
248 #else /* !CONFIG_BLK_DEV_INITRD */
250 static unsigned long __init
init_initrd(void)
255 #define finalize_initrd() do {} while (0)
260 * Initialize the bootmem allocator. It also setup initrd related data
263 #ifdef CONFIG_SGI_IP27
265 static void __init
bootmem_init(void)
271 #else /* !CONFIG_SGI_IP27 */
273 static void __init
bootmem_init(void)
275 unsigned long reserved_end
;
276 unsigned long mapstart
= ~0UL;
277 unsigned long bootmap_size
;
281 * Init any data related to initrd. It's a nop if INITRD is
282 * not selected. Once that done we can determine the low bound
285 reserved_end
= max(init_initrd(),
286 (unsigned long) PFN_UP(__pa_symbol(&_end
)));
289 * max_low_pfn is not a number of pages. The number of pages
290 * of the system is given by 'max_low_pfn - min_low_pfn'.
296 * Find the highest page frame number we have available.
298 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
299 unsigned long start
, end
;
301 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
304 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
305 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
306 + boot_mem_map
.map
[i
].size
);
308 if (end
> max_low_pfn
)
310 if (start
< min_low_pfn
)
312 if (end
<= reserved_end
)
314 if (start
>= mapstart
)
316 mapstart
= max(reserved_end
, start
);
319 if (min_low_pfn
>= max_low_pfn
)
320 panic("Incorrect memory mapping !!!");
321 if (min_low_pfn
> ARCH_PFN_OFFSET
) {
322 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
323 (min_low_pfn
- ARCH_PFN_OFFSET
) * sizeof(struct page
),
324 min_low_pfn
- ARCH_PFN_OFFSET
);
325 } else if (min_low_pfn
< ARCH_PFN_OFFSET
) {
326 pr_info("%lu free pages won't be used\n",
327 ARCH_PFN_OFFSET
- min_low_pfn
);
329 min_low_pfn
= ARCH_PFN_OFFSET
;
332 * Determine low and high memory ranges
334 max_pfn
= max_low_pfn
;
335 if (max_low_pfn
> PFN_DOWN(HIGHMEM_START
)) {
336 #ifdef CONFIG_HIGHMEM
337 highstart_pfn
= PFN_DOWN(HIGHMEM_START
);
338 highend_pfn
= max_low_pfn
;
340 max_low_pfn
= PFN_DOWN(HIGHMEM_START
);
344 * Initialize the boot-time allocator with low memory only.
346 bootmap_size
= init_bootmem_node(NODE_DATA(0), mapstart
,
347 min_low_pfn
, max_low_pfn
);
350 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
351 unsigned long start
, end
;
353 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
354 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
355 + boot_mem_map
.map
[i
].size
);
357 if (start
<= min_low_pfn
)
362 #ifndef CONFIG_HIGHMEM
363 if (end
> max_low_pfn
)
367 * ... finally, is the area going away?
373 memblock_add_node(PFN_PHYS(start
), PFN_PHYS(end
- start
), 0);
377 * Register fully available low RAM pages with the bootmem allocator.
379 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
380 unsigned long start
, end
, size
;
382 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
383 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
384 + boot_mem_map
.map
[i
].size
);
387 * Reserve usable memory.
389 switch (boot_mem_map
.map
[i
].type
) {
392 case BOOT_MEM_INIT_RAM
:
393 memory_present(0, start
, end
);
396 /* Not usable memory */
401 * We are rounding up the start address of usable memory
402 * and at the end of the usable range downwards.
404 if (start
>= max_low_pfn
)
406 if (start
< reserved_end
)
407 start
= reserved_end
;
408 if (end
> max_low_pfn
)
412 * ... finally, is the area going away?
418 /* Register lowmem ranges */
419 free_bootmem(PFN_PHYS(start
), size
<< PAGE_SHIFT
);
420 memory_present(0, start
, end
);
424 * Reserve the bootmap memory.
426 reserve_bootmem(PFN_PHYS(mapstart
), bootmap_size
, BOOTMEM_DEFAULT
);
429 * Reserve initrd memory if needed.
434 #endif /* CONFIG_SGI_IP27 */
437 * arch_mem_init - initialize memory management subsystem
439 * o plat_mem_setup() detects the memory configuration and will record detected
440 * memory areas using add_memory_region.
442 * At this stage the memory configuration of the system is known to the
443 * kernel but generic memory management system is still entirely uninitialized.
449 * At this stage the bootmem allocator is ready to use.
451 * NOTE: historically plat_mem_setup did the entire platform initialization.
452 * This was rather impractical because it meant plat_mem_setup had to
453 * get away without any kind of memory allocator. To keep old code from
454 * breaking plat_setup was just renamed to plat_setup and a second platform
455 * initialization hook for anything else was introduced.
458 static int usermem __initdata
;
460 static int __init
early_parse_mem(char *p
)
462 unsigned long start
, size
;
465 * If a user specifies memory size, we
466 * blow away any automatically generated
470 boot_mem_map
.nr_map
= 0;
474 size
= memparse(p
, &p
);
476 start
= memparse(p
+ 1, &p
);
478 add_memory_region(start
, size
, BOOT_MEM_RAM
);
481 early_param("mem", early_parse_mem
);
483 static void __init
arch_mem_init(char **cmdline_p
)
485 phys_t init_mem
, init_end
, init_size
;
487 extern void plat_mem_setup(void);
489 /* call board setup routine */
492 init_mem
= PFN_UP(__pa_symbol(&__init_begin
)) << PAGE_SHIFT
;
493 init_end
= PFN_DOWN(__pa_symbol(&__init_end
)) << PAGE_SHIFT
;
494 init_size
= init_end
- init_mem
;
496 /* Make sure it is in the boot_mem_map */
499 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
500 if (init_mem
>= boot_mem_map
.map
[i
].addr
&&
501 init_mem
< (boot_mem_map
.map
[i
].addr
+
502 boot_mem_map
.map
[i
].size
)) {
508 add_memory_region(init_mem
, init_size
,
512 pr_info("Determined physical RAM map:\n");
515 #ifdef CONFIG_CMDLINE_BOOL
516 #ifdef CONFIG_CMDLINE_OVERRIDE
517 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
519 if (builtin_cmdline
[0]) {
520 strlcat(arcs_cmdline
, " ", COMMAND_LINE_SIZE
);
521 strlcat(arcs_cmdline
, builtin_cmdline
, COMMAND_LINE_SIZE
);
523 strlcpy(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
526 strlcpy(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
528 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
530 *cmdline_p
= command_line
;
535 pr_info("User-defined physical RAM map:\n");
541 if (crashk_res
.start
!= crashk_res
.end
)
542 reserve_bootmem(crashk_res
.start
,
543 crashk_res
.end
- crashk_res
.start
+ 1,
548 plat_swiotlb_setup();
553 static inline unsigned long long get_total_mem(void)
555 unsigned long long total
;
557 total
= max_pfn
- min_low_pfn
;
558 return total
<< PAGE_SHIFT
;
561 static void __init
mips_parse_crashkernel(void)
563 unsigned long long total_mem
;
564 unsigned long long crash_size
, crash_base
;
567 total_mem
= get_total_mem();
568 ret
= parse_crashkernel(boot_command_line
, total_mem
,
569 &crash_size
, &crash_base
);
570 if (ret
!= 0 || crash_size
<= 0)
573 crashk_res
.start
= crash_base
;
574 crashk_res
.end
= crash_base
+ crash_size
- 1;
577 static void __init
request_crashkernel(struct resource
*res
)
581 ret
= request_resource(res
, &crashk_res
);
583 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
584 (unsigned long)((crashk_res
.end
-
585 crashk_res
.start
+ 1) >> 20),
586 (unsigned long)(crashk_res
.start
>> 20));
588 #else /* !defined(CONFIG_KEXEC) */
589 static void __init
mips_parse_crashkernel(void)
593 static void __init
request_crashkernel(struct resource
*res
)
596 #endif /* !defined(CONFIG_KEXEC) */
598 static void __init
resource_init(void)
602 if (UNCAC_BASE
!= IO_BASE
)
605 code_resource
.start
= __pa_symbol(&_text
);
606 code_resource
.end
= __pa_symbol(&_etext
) - 1;
607 data_resource
.start
= __pa_symbol(&_etext
);
608 data_resource
.end
= __pa_symbol(&_edata
) - 1;
611 * Request address space for all standard RAM.
613 mips_parse_crashkernel();
615 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
616 struct resource
*res
;
617 unsigned long start
, end
;
619 start
= boot_mem_map
.map
[i
].addr
;
620 end
= boot_mem_map
.map
[i
].addr
+ boot_mem_map
.map
[i
].size
- 1;
621 if (start
>= HIGHMEM_START
)
623 if (end
>= HIGHMEM_START
)
624 end
= HIGHMEM_START
- 1;
626 res
= alloc_bootmem(sizeof(struct resource
));
627 switch (boot_mem_map
.map
[i
].type
) {
629 case BOOT_MEM_INIT_RAM
:
630 case BOOT_MEM_ROM_DATA
:
631 res
->name
= "System RAM";
633 case BOOT_MEM_RESERVED
:
635 res
->name
= "reserved";
641 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
642 request_resource(&iomem_resource
, res
);
645 * We don't know which RAM region contains kernel data,
646 * so we try it repeatedly and let the resource manager
649 request_resource(res
, &code_resource
);
650 request_resource(res
, &data_resource
);
651 request_crashkernel(res
);
655 void __init
setup_arch(char **cmdline_p
)
660 #ifdef CONFIG_EARLY_PRINTK
661 setup_early_printk();
666 #if defined(CONFIG_VT)
667 #if defined(CONFIG_VGA_CONSOLE)
668 conswitchp
= &vga_con
;
669 #elif defined(CONFIG_DUMMY_CONSOLE)
670 conswitchp
= &dummy_con
;
674 arch_mem_init(cmdline_p
);
682 unsigned long kernelsp
[NR_CPUS
];
683 unsigned long fw_arg0
, fw_arg1
, fw_arg2
, fw_arg3
;
685 #ifdef CONFIG_DEBUG_FS
686 struct dentry
*mips_debugfs_dir
;
687 static int __init
debugfs_mips(void)
691 d
= debugfs_create_dir("mips", NULL
);
694 mips_debugfs_dir
= d
;
697 arch_initcall(debugfs_mips
);