2 * linux/arch/arm/kernel/setup.c
4 * Copyright (C) 1995-2001 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/initrd.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/seq_file.h>
20 #include <linux/screen_info.h>
21 #include <linux/init.h>
22 #include <linux/root_dev.h>
23 #include <linux/cpu.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp.h>
29 #include <asm/cputype.h>
31 #include <asm/procinfo.h>
32 #include <asm/setup.h>
33 #include <asm/mach-types.h>
34 #include <asm/cacheflush.h>
35 #include <asm/cachetype.h>
36 #include <asm/tlbflush.h>
38 #include <asm/mach/arch.h>
39 #include <asm/mach/irq.h>
40 #include <asm/mach/time.h>
41 #include <asm/traps.h>
47 #define MEM_SIZE (16*1024*1024)
50 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
53 static int __init
fpe_setup(char *line
)
55 memcpy(fpe_type
, line
, 8);
59 __setup("fpe=", fpe_setup
);
62 extern void paging_init(struct meminfo
*, struct machine_desc
*desc
);
63 extern void reboot_setup(char *str
);
64 extern void _text
, _etext
, __data_start
, _edata
, _end
;
66 unsigned int processor_id
;
67 EXPORT_SYMBOL(processor_id
);
68 unsigned int __machine_arch_type
;
69 EXPORT_SYMBOL(__machine_arch_type
);
71 unsigned int __atags_pointer __initdata
;
73 unsigned int system_rev
;
74 EXPORT_SYMBOL(system_rev
);
76 unsigned int system_serial_low
;
77 EXPORT_SYMBOL(system_serial_low
);
79 unsigned int system_serial_high
;
80 EXPORT_SYMBOL(system_serial_high
);
82 unsigned int elf_hwcap
;
83 EXPORT_SYMBOL(elf_hwcap
);
85 unsigned long __initdata vmalloc_reserve
= 128 << 20;
89 struct processor processor
;
92 struct cpu_tlb_fns cpu_tlb
;
95 struct cpu_user_fns cpu_user
;
98 struct cpu_cache_fns cpu_cache
;
100 #ifdef CONFIG_OUTER_CACHE
101 struct outer_cache_fns outer_cache
;
108 } ____cacheline_aligned
;
110 static struct stack stacks
[NR_CPUS
];
112 char elf_platform
[ELF_PLATFORM_SIZE
];
113 EXPORT_SYMBOL(elf_platform
);
115 static struct meminfo meminfo __initdata
= { 0, };
116 static const char *cpu_name
;
117 static const char *machine_name
;
118 static char __initdata command_line
[COMMAND_LINE_SIZE
];
120 static char default_command_line
[COMMAND_LINE_SIZE
] __initdata
= CONFIG_CMDLINE
;
121 static union { char c
[4]; unsigned long l
; } endian_test __initdata
= { { 'l', '?', '?', 'b' } };
122 #define ENDIANNESS ((char)endian_test.l)
124 DEFINE_PER_CPU(struct cpuinfo_arm
, cpu_data
);
127 * Standard memory resources
129 static struct resource mem_res
[] = {
134 .flags
= IORESOURCE_MEM
137 .name
= "Kernel text",
140 .flags
= IORESOURCE_MEM
143 .name
= "Kernel data",
146 .flags
= IORESOURCE_MEM
150 #define video_ram mem_res[0]
151 #define kernel_code mem_res[1]
152 #define kernel_data mem_res[2]
154 static struct resource io_res
[] = {
159 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
165 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
171 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
175 #define lp0 io_res[0]
176 #define lp1 io_res[1]
177 #define lp2 io_res[2]
179 static const char *proc_arch
[] = {
199 int cpu_architecture(void)
203 if ((read_cpuid_id() & 0x0008f000) == 0) {
204 cpu_arch
= CPU_ARCH_UNKNOWN
;
205 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
206 cpu_arch
= (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T
: CPU_ARCH_ARMv3
;
207 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
208 cpu_arch
= (read_cpuid_id() >> 16) & 7;
210 cpu_arch
+= CPU_ARCH_ARMv3
;
211 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
214 /* Revised CPUID format. Read the Memory Model Feature
215 * Register 0 and check for VMSAv7 or PMSAv7 */
216 asm("mrc p15, 0, %0, c0, c1, 4"
218 if ((mmfr0
& 0x0000000f) == 0x00000003 ||
219 (mmfr0
& 0x000000f0) == 0x00000030)
220 cpu_arch
= CPU_ARCH_ARMv7
;
221 else if ((mmfr0
& 0x0000000f) == 0x00000002 ||
222 (mmfr0
& 0x000000f0) == 0x00000020)
223 cpu_arch
= CPU_ARCH_ARMv6
;
225 cpu_arch
= CPU_ARCH_UNKNOWN
;
227 cpu_arch
= CPU_ARCH_UNKNOWN
;
233 * These functions re-use the assembly code in head.S, which
234 * already provide the required functionality.
236 extern struct proc_info_list
*lookup_processor_type(unsigned int);
237 extern struct machine_desc
*lookup_machine_type(unsigned int);
239 static void __init
setup_processor(void)
241 struct proc_info_list
*list
;
244 * locate processor in the list of supported processor
245 * types. The linker builds this table for us from the
246 * entries in arch/arm/mm/proc-*.S
248 list
= lookup_processor_type(read_cpuid_id());
250 printk("CPU configuration botched (ID %08x), unable "
251 "to continue.\n", read_cpuid_id());
255 cpu_name
= list
->cpu_name
;
258 processor
= *list
->proc
;
261 cpu_tlb
= *list
->tlb
;
264 cpu_user
= *list
->user
;
267 cpu_cache
= *list
->cache
;
270 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
271 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15,
272 proc_arch
[cpu_architecture()], cr_alignment
);
274 sprintf(init_utsname()->machine
, "%s%c", list
->arch_name
, ENDIANNESS
);
275 sprintf(elf_platform
, "%s%c", list
->elf_name
, ENDIANNESS
);
276 elf_hwcap
= list
->elf_hwcap
;
277 #ifndef CONFIG_ARM_THUMB
278 elf_hwcap
&= ~HWCAP_THUMB
;
285 * cpu_init - initialise one CPU.
287 * cpu_init sets up the per-CPU stacks.
291 unsigned int cpu
= smp_processor_id();
292 struct stack
*stk
= &stacks
[cpu
];
294 if (cpu
>= NR_CPUS
) {
295 printk(KERN_CRIT
"CPU%u: bad primary CPU number\n", cpu
);
300 * setup stacks for re-entrant exception handlers
312 "I" (PSR_F_BIT
| PSR_I_BIT
| IRQ_MODE
),
313 "I" (offsetof(struct stack
, irq
[0])),
314 "I" (PSR_F_BIT
| PSR_I_BIT
| ABT_MODE
),
315 "I" (offsetof(struct stack
, abt
[0])),
316 "I" (PSR_F_BIT
| PSR_I_BIT
| UND_MODE
),
317 "I" (offsetof(struct stack
, und
[0])),
318 "I" (PSR_F_BIT
| PSR_I_BIT
| SVC_MODE
)
322 static struct machine_desc
* __init
setup_machine(unsigned int nr
)
324 struct machine_desc
*list
;
327 * locate machine in the list of supported machines.
329 list
= lookup_machine_type(nr
);
331 printk("Machine configuration botched (nr %d), unable "
332 "to continue.\n", nr
);
336 printk("Machine: %s\n", list
->name
);
341 static void __init
arm_add_memory(unsigned long start
, unsigned long size
)
343 struct membank
*bank
;
346 * Ensure that start/size are aligned to a page boundary.
347 * Size is appropriately rounded down, start is rounded up.
349 size
-= start
& ~PAGE_MASK
;
351 bank
= &meminfo
.bank
[meminfo
.nr_banks
++];
353 bank
->start
= PAGE_ALIGN(start
);
354 bank
->size
= size
& PAGE_MASK
;
355 bank
->node
= PHYS_TO_NID(start
);
359 * Pick out the memory size. We look for mem=size@start,
360 * where start and size are "size[KkMm]"
362 static void __init
early_mem(char **p
)
364 static int usermem __initdata
= 0;
365 unsigned long size
, start
;
368 * If the user specifies memory size, we
369 * blow away any automatically generated
374 meminfo
.nr_banks
= 0;
378 size
= memparse(*p
, p
);
380 start
= memparse(*p
+ 1, p
);
382 arm_add_memory(start
, size
);
384 __early_param("mem=", early_mem
);
387 * vmalloc=size forces the vmalloc area to be exactly 'size'
388 * bytes. This can be used to increase (or decrease) the vmalloc
389 * area - the default is 128m.
391 static void __init
early_vmalloc(char **arg
)
393 vmalloc_reserve
= memparse(*arg
, arg
);
395 __early_param("vmalloc=", early_vmalloc
);
398 * Initial parsing of the command line.
400 static void __init
parse_cmdline(char **cmdline_p
, char *from
)
402 char c
= ' ', *to
= command_line
;
407 extern struct early_params __early_begin
, __early_end
;
408 struct early_params
*p
;
410 for (p
= &__early_begin
; p
< &__early_end
; p
++) {
411 int arglen
= strlen(p
->arg
);
413 if (memcmp(from
, p
->arg
, arglen
) == 0) {
414 if (to
!= command_line
)
419 while (*from
!= ' ' && *from
!= '\0')
428 if (COMMAND_LINE_SIZE
<= ++len
)
433 *cmdline_p
= command_line
;
437 setup_ramdisk(int doload
, int prompt
, int image_start
, unsigned int rd_sz
)
439 #ifdef CONFIG_BLK_DEV_RAM
440 extern int rd_size
, rd_image_start
, rd_prompt
, rd_doload
;
442 rd_image_start
= image_start
;
452 request_standard_resources(struct meminfo
*mi
, struct machine_desc
*mdesc
)
454 struct resource
*res
;
457 kernel_code
.start
= virt_to_phys(&_text
);
458 kernel_code
.end
= virt_to_phys(&_etext
- 1);
459 kernel_data
.start
= virt_to_phys(&__data_start
);
460 kernel_data
.end
= virt_to_phys(&_end
- 1);
462 for (i
= 0; i
< mi
->nr_banks
; i
++) {
463 unsigned long virt_start
, virt_end
;
465 if (mi
->bank
[i
].size
== 0)
468 virt_start
= __phys_to_virt(mi
->bank
[i
].start
);
469 virt_end
= virt_start
+ mi
->bank
[i
].size
- 1;
471 res
= alloc_bootmem_low(sizeof(*res
));
472 res
->name
= "System RAM";
473 res
->start
= __virt_to_phys(virt_start
);
474 res
->end
= __virt_to_phys(virt_end
);
475 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
477 request_resource(&iomem_resource
, res
);
479 if (kernel_code
.start
>= res
->start
&&
480 kernel_code
.end
<= res
->end
)
481 request_resource(res
, &kernel_code
);
482 if (kernel_data
.start
>= res
->start
&&
483 kernel_data
.end
<= res
->end
)
484 request_resource(res
, &kernel_data
);
487 if (mdesc
->video_start
) {
488 video_ram
.start
= mdesc
->video_start
;
489 video_ram
.end
= mdesc
->video_end
;
490 request_resource(&iomem_resource
, &video_ram
);
494 * Some machines don't have the possibility of ever
495 * possessing lp0, lp1 or lp2
497 if (mdesc
->reserve_lp0
)
498 request_resource(&ioport_resource
, &lp0
);
499 if (mdesc
->reserve_lp1
)
500 request_resource(&ioport_resource
, &lp1
);
501 if (mdesc
->reserve_lp2
)
502 request_resource(&ioport_resource
, &lp2
);
508 * This is the new way of passing data to the kernel at boot time. Rather
509 * than passing a fixed inflexible structure to the kernel, we pass a list
510 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
511 * tag for the list to be recognised (to distinguish the tagged list from
512 * a param_struct). The list is terminated with a zero-length tag (this tag
513 * is not parsed in any way).
515 static int __init
parse_tag_core(const struct tag
*tag
)
517 if (tag
->hdr
.size
> 2) {
518 if ((tag
->u
.core
.flags
& 1) == 0)
519 root_mountflags
&= ~MS_RDONLY
;
520 ROOT_DEV
= old_decode_dev(tag
->u
.core
.rootdev
);
525 __tagtable(ATAG_CORE
, parse_tag_core
);
527 static int __init
parse_tag_mem32(const struct tag
*tag
)
529 if (meminfo
.nr_banks
>= NR_BANKS
) {
531 "Ignoring memory bank 0x%08x size %dKB\n",
532 tag
->u
.mem
.start
, tag
->u
.mem
.size
/ 1024);
535 arm_add_memory(tag
->u
.mem
.start
, tag
->u
.mem
.size
);
539 __tagtable(ATAG_MEM
, parse_tag_mem32
);
541 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
542 struct screen_info screen_info
= {
543 .orig_video_lines
= 30,
544 .orig_video_cols
= 80,
545 .orig_video_mode
= 0,
546 .orig_video_ega_bx
= 0,
547 .orig_video_isVGA
= 1,
548 .orig_video_points
= 8
551 static int __init
parse_tag_videotext(const struct tag
*tag
)
553 screen_info
.orig_x
= tag
->u
.videotext
.x
;
554 screen_info
.orig_y
= tag
->u
.videotext
.y
;
555 screen_info
.orig_video_page
= tag
->u
.videotext
.video_page
;
556 screen_info
.orig_video_mode
= tag
->u
.videotext
.video_mode
;
557 screen_info
.orig_video_cols
= tag
->u
.videotext
.video_cols
;
558 screen_info
.orig_video_ega_bx
= tag
->u
.videotext
.video_ega_bx
;
559 screen_info
.orig_video_lines
= tag
->u
.videotext
.video_lines
;
560 screen_info
.orig_video_isVGA
= tag
->u
.videotext
.video_isvga
;
561 screen_info
.orig_video_points
= tag
->u
.videotext
.video_points
;
565 __tagtable(ATAG_VIDEOTEXT
, parse_tag_videotext
);
568 static int __init
parse_tag_ramdisk(const struct tag
*tag
)
570 setup_ramdisk((tag
->u
.ramdisk
.flags
& 1) == 0,
571 (tag
->u
.ramdisk
.flags
& 2) == 0,
572 tag
->u
.ramdisk
.start
, tag
->u
.ramdisk
.size
);
576 __tagtable(ATAG_RAMDISK
, parse_tag_ramdisk
);
578 static int __init
parse_tag_serialnr(const struct tag
*tag
)
580 system_serial_low
= tag
->u
.serialnr
.low
;
581 system_serial_high
= tag
->u
.serialnr
.high
;
585 __tagtable(ATAG_SERIAL
, parse_tag_serialnr
);
587 static int __init
parse_tag_revision(const struct tag
*tag
)
589 system_rev
= tag
->u
.revision
.rev
;
593 __tagtable(ATAG_REVISION
, parse_tag_revision
);
595 static int __init
parse_tag_cmdline(const struct tag
*tag
)
597 strlcpy(default_command_line
, tag
->u
.cmdline
.cmdline
, COMMAND_LINE_SIZE
);
601 __tagtable(ATAG_CMDLINE
, parse_tag_cmdline
);
604 * Scan the tag table for this tag, and call its parse function.
605 * The tag table is built by the linker from all the __tagtable
608 static int __init
parse_tag(const struct tag
*tag
)
610 extern struct tagtable __tagtable_begin
, __tagtable_end
;
613 for (t
= &__tagtable_begin
; t
< &__tagtable_end
; t
++)
614 if (tag
->hdr
.tag
== t
->tag
) {
619 return t
< &__tagtable_end
;
623 * Parse all tags in the list, checking both the global and architecture
624 * specific tag tables.
626 static void __init
parse_tags(const struct tag
*t
)
628 for (; t
->hdr
.size
; t
= tag_next(t
))
631 "Ignoring unrecognised tag 0x%08x\n",
636 * This holds our defaults.
638 static struct init_tags
{
639 struct tag_header hdr1
;
640 struct tag_core core
;
641 struct tag_header hdr2
;
642 struct tag_mem32 mem
;
643 struct tag_header hdr3
;
644 } init_tags __initdata
= {
645 { tag_size(tag_core
), ATAG_CORE
},
646 { 1, PAGE_SIZE
, 0xff },
647 { tag_size(tag_mem32
), ATAG_MEM
},
648 { MEM_SIZE
, PHYS_OFFSET
},
652 static void (*init_machine
)(void) __initdata
;
654 static int __init
customize_machine(void)
656 /* customizes platform devices, or adds new ones */
661 arch_initcall(customize_machine
);
663 void __init
setup_arch(char **cmdline_p
)
665 struct tag
*tags
= (struct tag
*)&init_tags
;
666 struct machine_desc
*mdesc
;
667 char *from
= default_command_line
;
670 mdesc
= setup_machine(machine_arch_type
);
671 machine_name
= mdesc
->name
;
673 if (mdesc
->soft_reboot
)
677 tags
= phys_to_virt(__atags_pointer
);
678 else if (mdesc
->boot_params
)
679 tags
= phys_to_virt(mdesc
->boot_params
);
682 * If we have the old style parameters, convert them to
685 if (tags
->hdr
.tag
!= ATAG_CORE
)
686 convert_to_tag_list(tags
);
687 if (tags
->hdr
.tag
!= ATAG_CORE
)
688 tags
= (struct tag
*)&init_tags
;
691 mdesc
->fixup(mdesc
, tags
, &from
, &meminfo
);
693 if (tags
->hdr
.tag
== ATAG_CORE
) {
694 if (meminfo
.nr_banks
!= 0)
695 squash_mem_tags(tags
);
700 init_mm
.start_code
= (unsigned long) &_text
;
701 init_mm
.end_code
= (unsigned long) &_etext
;
702 init_mm
.end_data
= (unsigned long) &_edata
;
703 init_mm
.brk
= (unsigned long) &_end
;
705 memcpy(boot_command_line
, from
, COMMAND_LINE_SIZE
);
706 boot_command_line
[COMMAND_LINE_SIZE
-1] = '\0';
707 parse_cmdline(cmdline_p
, from
);
708 paging_init(&meminfo
, mdesc
);
709 request_standard_resources(&meminfo
, mdesc
);
718 * Set up various architecture-specific pointers
720 init_arch_irq
= mdesc
->init_irq
;
721 system_timer
= mdesc
->timer
;
722 init_machine
= mdesc
->init_machine
;
725 #if defined(CONFIG_VGA_CONSOLE)
726 conswitchp
= &vga_con
;
727 #elif defined(CONFIG_DUMMY_CONSOLE)
728 conswitchp
= &dummy_con
;
735 static int __init
topology_init(void)
739 for_each_possible_cpu(cpu
) {
740 struct cpuinfo_arm
*cpuinfo
= &per_cpu(cpu_data
, cpu
);
741 cpuinfo
->cpu
.hotpluggable
= 1;
742 register_cpu(&cpuinfo
->cpu
, cpu
);
748 subsys_initcall(topology_init
);
750 static const char *hwcap_str
[] = {
765 static int c_show(struct seq_file
*m
, void *v
)
769 seq_printf(m
, "Processor\t: %s rev %d (%s)\n",
770 cpu_name
, read_cpuid_id() & 15, elf_platform
);
772 #if defined(CONFIG_SMP)
773 for_each_online_cpu(i
) {
775 * glibc reads /proc/cpuinfo to determine the number of
776 * online processors, looking for lines beginning with
777 * "processor". Give glibc what it expects.
779 seq_printf(m
, "processor\t: %d\n", i
);
780 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n\n",
781 per_cpu(cpu_data
, i
).loops_per_jiffy
/ (500000UL/HZ
),
782 (per_cpu(cpu_data
, i
).loops_per_jiffy
/ (5000UL/HZ
)) % 100);
784 #else /* CONFIG_SMP */
785 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n",
786 loops_per_jiffy
/ (500000/HZ
),
787 (loops_per_jiffy
/ (5000/HZ
)) % 100);
790 /* dump out the processor features */
791 seq_puts(m
, "Features\t: ");
793 for (i
= 0; hwcap_str
[i
]; i
++)
794 if (elf_hwcap
& (1 << i
))
795 seq_printf(m
, "%s ", hwcap_str
[i
]);
797 seq_printf(m
, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
798 seq_printf(m
, "CPU architecture: %s\n", proc_arch
[cpu_architecture()]);
800 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
802 seq_printf(m
, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
804 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
806 seq_printf(m
, "CPU variant\t: 0x%02x\n",
807 (read_cpuid_id() >> 16) & 127);
810 seq_printf(m
, "CPU variant\t: 0x%x\n",
811 (read_cpuid_id() >> 20) & 15);
813 seq_printf(m
, "CPU part\t: 0x%03x\n",
814 (read_cpuid_id() >> 4) & 0xfff);
816 seq_printf(m
, "CPU revision\t: %d\n", read_cpuid_id() & 15);
820 seq_printf(m
, "Hardware\t: %s\n", machine_name
);
821 seq_printf(m
, "Revision\t: %04x\n", system_rev
);
822 seq_printf(m
, "Serial\t\t: %08x%08x\n",
823 system_serial_high
, system_serial_low
);
828 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
830 return *pos
< 1 ? (void *)1 : NULL
;
833 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
839 static void c_stop(struct seq_file
*m
, void *v
)
843 const struct seq_operations cpuinfo_op
= {