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/sections.h>
33 #include <asm/setup.h>
34 #include <asm/mach-types.h>
35 #include <asm/cacheflush.h>
36 #include <asm/cachetype.h>
37 #include <asm/tlbflush.h>
39 #include <asm/mach/arch.h>
40 #include <asm/mach/irq.h>
41 #include <asm/mach/time.h>
42 #include <asm/traps.h>
43 #include <asm/unwind.h>
49 #define MEM_SIZE (16*1024*1024)
52 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
55 static int __init
fpe_setup(char *line
)
57 memcpy(fpe_type
, line
, 8);
61 __setup("fpe=", fpe_setup
);
64 extern void paging_init(struct machine_desc
*desc
);
65 extern void reboot_setup(char *str
);
67 unsigned int processor_id
;
68 EXPORT_SYMBOL(processor_id
);
69 unsigned int __machine_arch_type
;
70 EXPORT_SYMBOL(__machine_arch_type
);
72 EXPORT_SYMBOL(cacheid
);
74 unsigned int __atags_pointer __initdata
;
76 unsigned int system_rev
;
77 EXPORT_SYMBOL(system_rev
);
79 unsigned int system_serial_low
;
80 EXPORT_SYMBOL(system_serial_low
);
82 unsigned int system_serial_high
;
83 EXPORT_SYMBOL(system_serial_high
);
85 unsigned int elf_hwcap
;
86 EXPORT_SYMBOL(elf_hwcap
);
90 struct processor processor
;
93 struct cpu_tlb_fns cpu_tlb
;
96 struct cpu_user_fns cpu_user
;
99 struct cpu_cache_fns cpu_cache
;
101 #ifdef CONFIG_OUTER_CACHE
102 struct outer_cache_fns outer_cache
;
109 } ____cacheline_aligned
;
111 static struct stack stacks
[NR_CPUS
];
113 char elf_platform
[ELF_PLATFORM_SIZE
];
114 EXPORT_SYMBOL(elf_platform
);
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
;
232 static void __init
cacheid_init(void)
234 unsigned int cachetype
= read_cpuid_cachetype();
235 unsigned int arch
= cpu_architecture();
237 if (arch
>= CPU_ARCH_ARMv7
) {
238 cacheid
= CACHEID_VIPT_NONALIASING
;
239 if ((cachetype
& (3 << 14)) == 1 << 14)
240 cacheid
|= CACHEID_ASID_TAGGED
;
241 } else if (arch
>= CPU_ARCH_ARMv6
) {
242 if (cachetype
& (1 << 23))
243 cacheid
= CACHEID_VIPT_ALIASING
;
245 cacheid
= CACHEID_VIPT_NONALIASING
;
247 cacheid
= CACHEID_VIVT
;
250 printk("CPU: %s data cache, %s instruction cache\n",
251 cache_is_vivt() ? "VIVT" :
252 cache_is_vipt_aliasing() ? "VIPT aliasing" :
253 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
254 cache_is_vivt() ? "VIVT" :
255 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
256 cache_is_vipt_aliasing() ? "VIPT aliasing" :
257 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
261 * These functions re-use the assembly code in head.S, which
262 * already provide the required functionality.
264 extern struct proc_info_list
*lookup_processor_type(unsigned int);
265 extern struct machine_desc
*lookup_machine_type(unsigned int);
267 static void __init
setup_processor(void)
269 struct proc_info_list
*list
;
272 * locate processor in the list of supported processor
273 * types. The linker builds this table for us from the
274 * entries in arch/arm/mm/proc-*.S
276 list
= lookup_processor_type(read_cpuid_id());
278 printk("CPU configuration botched (ID %08x), unable "
279 "to continue.\n", read_cpuid_id());
283 cpu_name
= list
->cpu_name
;
286 processor
= *list
->proc
;
289 cpu_tlb
= *list
->tlb
;
292 cpu_user
= *list
->user
;
295 cpu_cache
= *list
->cache
;
298 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
299 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15,
300 proc_arch
[cpu_architecture()], cr_alignment
);
302 sprintf(init_utsname()->machine
, "%s%c", list
->arch_name
, ENDIANNESS
);
303 sprintf(elf_platform
, "%s%c", list
->elf_name
, ENDIANNESS
);
304 elf_hwcap
= list
->elf_hwcap
;
305 #ifndef CONFIG_ARM_THUMB
306 elf_hwcap
&= ~HWCAP_THUMB
;
314 * cpu_init - initialise one CPU.
316 * cpu_init sets up the per-CPU stacks.
320 unsigned int cpu
= smp_processor_id();
321 struct stack
*stk
= &stacks
[cpu
];
323 if (cpu
>= NR_CPUS
) {
324 printk(KERN_CRIT
"CPU%u: bad primary CPU number\n", cpu
);
329 * setup stacks for re-entrant exception handlers
341 "I" (PSR_F_BIT
| PSR_I_BIT
| IRQ_MODE
),
342 "I" (offsetof(struct stack
, irq
[0])),
343 "I" (PSR_F_BIT
| PSR_I_BIT
| ABT_MODE
),
344 "I" (offsetof(struct stack
, abt
[0])),
345 "I" (PSR_F_BIT
| PSR_I_BIT
| UND_MODE
),
346 "I" (offsetof(struct stack
, und
[0])),
347 "I" (PSR_F_BIT
| PSR_I_BIT
| SVC_MODE
)
351 static struct machine_desc
* __init
setup_machine(unsigned int nr
)
353 struct machine_desc
*list
;
356 * locate machine in the list of supported machines.
358 list
= lookup_machine_type(nr
);
360 printk("Machine configuration botched (nr %d), unable "
361 "to continue.\n", nr
);
365 printk("Machine: %s\n", list
->name
);
370 static int __init
arm_add_memory(unsigned long start
, unsigned long size
)
372 struct membank
*bank
= &meminfo
.bank
[meminfo
.nr_banks
];
374 if (meminfo
.nr_banks
>= NR_BANKS
) {
375 printk(KERN_CRIT
"NR_BANKS too low, "
376 "ignoring memory at %#lx\n", start
);
381 * Ensure that start/size are aligned to a page boundary.
382 * Size is appropriately rounded down, start is rounded up.
384 size
-= start
& ~PAGE_MASK
;
385 bank
->start
= PAGE_ALIGN(start
);
386 bank
->size
= size
& PAGE_MASK
;
387 bank
->node
= PHYS_TO_NID(start
);
390 * Check whether this memory region has non-zero size or
391 * invalid node number.
393 if (bank
->size
== 0 || bank
->node
>= MAX_NUMNODES
)
401 * Pick out the memory size. We look for mem=size@start,
402 * where start and size are "size[KkMm]"
404 static void __init
early_mem(char **p
)
406 static int usermem __initdata
= 0;
407 unsigned long size
, start
;
410 * If the user specifies memory size, we
411 * blow away any automatically generated
416 meminfo
.nr_banks
= 0;
420 size
= memparse(*p
, p
);
422 start
= memparse(*p
+ 1, p
);
424 arm_add_memory(start
, size
);
426 __early_param("mem=", early_mem
);
429 * Initial parsing of the command line.
431 static void __init
parse_cmdline(char **cmdline_p
, char *from
)
433 char c
= ' ', *to
= command_line
;
438 extern struct early_params __early_begin
, __early_end
;
439 struct early_params
*p
;
441 for (p
= &__early_begin
; p
< &__early_end
; p
++) {
442 int arglen
= strlen(p
->arg
);
444 if (memcmp(from
, p
->arg
, arglen
) == 0) {
445 if (to
!= command_line
)
450 while (*from
!= ' ' && *from
!= '\0')
459 if (COMMAND_LINE_SIZE
<= ++len
)
464 *cmdline_p
= command_line
;
468 setup_ramdisk(int doload
, int prompt
, int image_start
, unsigned int rd_sz
)
470 #ifdef CONFIG_BLK_DEV_RAM
471 extern int rd_size
, rd_image_start
, rd_prompt
, rd_doload
;
473 rd_image_start
= image_start
;
483 request_standard_resources(struct meminfo
*mi
, struct machine_desc
*mdesc
)
485 struct resource
*res
;
488 kernel_code
.start
= virt_to_phys(_text
);
489 kernel_code
.end
= virt_to_phys(_etext
- 1);
490 kernel_data
.start
= virt_to_phys(_data
);
491 kernel_data
.end
= virt_to_phys(_end
- 1);
493 for (i
= 0; i
< mi
->nr_banks
; i
++) {
494 if (mi
->bank
[i
].size
== 0)
497 res
= alloc_bootmem_low(sizeof(*res
));
498 res
->name
= "System RAM";
499 res
->start
= mi
->bank
[i
].start
;
500 res
->end
= mi
->bank
[i
].start
+ mi
->bank
[i
].size
- 1;
501 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
503 request_resource(&iomem_resource
, res
);
505 if (kernel_code
.start
>= res
->start
&&
506 kernel_code
.end
<= res
->end
)
507 request_resource(res
, &kernel_code
);
508 if (kernel_data
.start
>= res
->start
&&
509 kernel_data
.end
<= res
->end
)
510 request_resource(res
, &kernel_data
);
513 if (mdesc
->video_start
) {
514 video_ram
.start
= mdesc
->video_start
;
515 video_ram
.end
= mdesc
->video_end
;
516 request_resource(&iomem_resource
, &video_ram
);
520 * Some machines don't have the possibility of ever
521 * possessing lp0, lp1 or lp2
523 if (mdesc
->reserve_lp0
)
524 request_resource(&ioport_resource
, &lp0
);
525 if (mdesc
->reserve_lp1
)
526 request_resource(&ioport_resource
, &lp1
);
527 if (mdesc
->reserve_lp2
)
528 request_resource(&ioport_resource
, &lp2
);
534 * This is the new way of passing data to the kernel at boot time. Rather
535 * than passing a fixed inflexible structure to the kernel, we pass a list
536 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
537 * tag for the list to be recognised (to distinguish the tagged list from
538 * a param_struct). The list is terminated with a zero-length tag (this tag
539 * is not parsed in any way).
541 static int __init
parse_tag_core(const struct tag
*tag
)
543 if (tag
->hdr
.size
> 2) {
544 if ((tag
->u
.core
.flags
& 1) == 0)
545 root_mountflags
&= ~MS_RDONLY
;
546 ROOT_DEV
= old_decode_dev(tag
->u
.core
.rootdev
);
551 __tagtable(ATAG_CORE
, parse_tag_core
);
553 static int __init
parse_tag_mem32(const struct tag
*tag
)
555 return arm_add_memory(tag
->u
.mem
.start
, tag
->u
.mem
.size
);
558 __tagtable(ATAG_MEM
, parse_tag_mem32
);
560 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
561 struct screen_info screen_info
= {
562 .orig_video_lines
= 30,
563 .orig_video_cols
= 80,
564 .orig_video_mode
= 0,
565 .orig_video_ega_bx
= 0,
566 .orig_video_isVGA
= 1,
567 .orig_video_points
= 8
570 static int __init
parse_tag_videotext(const struct tag
*tag
)
572 screen_info
.orig_x
= tag
->u
.videotext
.x
;
573 screen_info
.orig_y
= tag
->u
.videotext
.y
;
574 screen_info
.orig_video_page
= tag
->u
.videotext
.video_page
;
575 screen_info
.orig_video_mode
= tag
->u
.videotext
.video_mode
;
576 screen_info
.orig_video_cols
= tag
->u
.videotext
.video_cols
;
577 screen_info
.orig_video_ega_bx
= tag
->u
.videotext
.video_ega_bx
;
578 screen_info
.orig_video_lines
= tag
->u
.videotext
.video_lines
;
579 screen_info
.orig_video_isVGA
= tag
->u
.videotext
.video_isvga
;
580 screen_info
.orig_video_points
= tag
->u
.videotext
.video_points
;
584 __tagtable(ATAG_VIDEOTEXT
, parse_tag_videotext
);
587 static int __init
parse_tag_ramdisk(const struct tag
*tag
)
589 setup_ramdisk((tag
->u
.ramdisk
.flags
& 1) == 0,
590 (tag
->u
.ramdisk
.flags
& 2) == 0,
591 tag
->u
.ramdisk
.start
, tag
->u
.ramdisk
.size
);
595 __tagtable(ATAG_RAMDISK
, parse_tag_ramdisk
);
597 static int __init
parse_tag_serialnr(const struct tag
*tag
)
599 system_serial_low
= tag
->u
.serialnr
.low
;
600 system_serial_high
= tag
->u
.serialnr
.high
;
604 __tagtable(ATAG_SERIAL
, parse_tag_serialnr
);
606 static int __init
parse_tag_revision(const struct tag
*tag
)
608 system_rev
= tag
->u
.revision
.rev
;
612 __tagtable(ATAG_REVISION
, parse_tag_revision
);
614 static int __init
parse_tag_cmdline(const struct tag
*tag
)
616 strlcpy(default_command_line
, tag
->u
.cmdline
.cmdline
, COMMAND_LINE_SIZE
);
620 __tagtable(ATAG_CMDLINE
, parse_tag_cmdline
);
623 * Scan the tag table for this tag, and call its parse function.
624 * The tag table is built by the linker from all the __tagtable
627 static int __init
parse_tag(const struct tag
*tag
)
629 extern struct tagtable __tagtable_begin
, __tagtable_end
;
632 for (t
= &__tagtable_begin
; t
< &__tagtable_end
; t
++)
633 if (tag
->hdr
.tag
== t
->tag
) {
638 return t
< &__tagtable_end
;
642 * Parse all tags in the list, checking both the global and architecture
643 * specific tag tables.
645 static void __init
parse_tags(const struct tag
*t
)
647 for (; t
->hdr
.size
; t
= tag_next(t
))
650 "Ignoring unrecognised tag 0x%08x\n",
655 * This holds our defaults.
657 static struct init_tags
{
658 struct tag_header hdr1
;
659 struct tag_core core
;
660 struct tag_header hdr2
;
661 struct tag_mem32 mem
;
662 struct tag_header hdr3
;
663 } init_tags __initdata
= {
664 { tag_size(tag_core
), ATAG_CORE
},
665 { 1, PAGE_SIZE
, 0xff },
666 { tag_size(tag_mem32
), ATAG_MEM
},
667 { MEM_SIZE
, PHYS_OFFSET
},
671 static void (*init_machine
)(void) __initdata
;
673 static int __init
customize_machine(void)
675 /* customizes platform devices, or adds new ones */
680 arch_initcall(customize_machine
);
682 void __init
setup_arch(char **cmdline_p
)
684 struct tag
*tags
= (struct tag
*)&init_tags
;
685 struct machine_desc
*mdesc
;
686 char *from
= default_command_line
;
691 mdesc
= setup_machine(machine_arch_type
);
692 machine_name
= mdesc
->name
;
694 if (mdesc
->soft_reboot
)
698 tags
= phys_to_virt(__atags_pointer
);
699 else if (mdesc
->boot_params
)
700 tags
= phys_to_virt(mdesc
->boot_params
);
703 * If we have the old style parameters, convert them to
706 if (tags
->hdr
.tag
!= ATAG_CORE
)
707 convert_to_tag_list(tags
);
708 if (tags
->hdr
.tag
!= ATAG_CORE
)
709 tags
= (struct tag
*)&init_tags
;
712 mdesc
->fixup(mdesc
, tags
, &from
, &meminfo
);
714 if (tags
->hdr
.tag
== ATAG_CORE
) {
715 if (meminfo
.nr_banks
!= 0)
716 squash_mem_tags(tags
);
721 init_mm
.start_code
= (unsigned long) _text
;
722 init_mm
.end_code
= (unsigned long) _etext
;
723 init_mm
.end_data
= (unsigned long) _edata
;
724 init_mm
.brk
= (unsigned long) _end
;
726 memcpy(boot_command_line
, from
, COMMAND_LINE_SIZE
);
727 boot_command_line
[COMMAND_LINE_SIZE
-1] = '\0';
728 parse_cmdline(cmdline_p
, from
);
730 request_standard_resources(&meminfo
, mdesc
);
739 * Set up various architecture-specific pointers
741 init_arch_irq
= mdesc
->init_irq
;
742 system_timer
= mdesc
->timer
;
743 init_machine
= mdesc
->init_machine
;
746 #if defined(CONFIG_VGA_CONSOLE)
747 conswitchp
= &vga_con
;
748 #elif defined(CONFIG_DUMMY_CONSOLE)
749 conswitchp
= &dummy_con
;
756 static int __init
topology_init(void)
760 for_each_possible_cpu(cpu
) {
761 struct cpuinfo_arm
*cpuinfo
= &per_cpu(cpu_data
, cpu
);
762 cpuinfo
->cpu
.hotpluggable
= 1;
763 register_cpu(&cpuinfo
->cpu
, cpu
);
769 subsys_initcall(topology_init
);
771 static const char *hwcap_str
[] = {
790 static int c_show(struct seq_file
*m
, void *v
)
794 seq_printf(m
, "Processor\t: %s rev %d (%s)\n",
795 cpu_name
, read_cpuid_id() & 15, elf_platform
);
797 #if defined(CONFIG_SMP)
798 for_each_online_cpu(i
) {
800 * glibc reads /proc/cpuinfo to determine the number of
801 * online processors, looking for lines beginning with
802 * "processor". Give glibc what it expects.
804 seq_printf(m
, "processor\t: %d\n", i
);
805 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n\n",
806 per_cpu(cpu_data
, i
).loops_per_jiffy
/ (500000UL/HZ
),
807 (per_cpu(cpu_data
, i
).loops_per_jiffy
/ (5000UL/HZ
)) % 100);
809 #else /* CONFIG_SMP */
810 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n",
811 loops_per_jiffy
/ (500000/HZ
),
812 (loops_per_jiffy
/ (5000/HZ
)) % 100);
815 /* dump out the processor features */
816 seq_puts(m
, "Features\t: ");
818 for (i
= 0; hwcap_str
[i
]; i
++)
819 if (elf_hwcap
& (1 << i
))
820 seq_printf(m
, "%s ", hwcap_str
[i
]);
822 seq_printf(m
, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
823 seq_printf(m
, "CPU architecture: %s\n", proc_arch
[cpu_architecture()]);
825 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
827 seq_printf(m
, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
829 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
831 seq_printf(m
, "CPU variant\t: 0x%02x\n",
832 (read_cpuid_id() >> 16) & 127);
835 seq_printf(m
, "CPU variant\t: 0x%x\n",
836 (read_cpuid_id() >> 20) & 15);
838 seq_printf(m
, "CPU part\t: 0x%03x\n",
839 (read_cpuid_id() >> 4) & 0xfff);
841 seq_printf(m
, "CPU revision\t: %d\n", read_cpuid_id() & 15);
845 seq_printf(m
, "Hardware\t: %s\n", machine_name
);
846 seq_printf(m
, "Revision\t: %04x\n", system_rev
);
847 seq_printf(m
, "Serial\t\t: %08x%08x\n",
848 system_serial_high
, system_serial_low
);
853 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
855 return *pos
< 1 ? (void *)1 : NULL
;
858 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
864 static void c_stop(struct seq_file
*m
, void *v
)
868 const struct seq_operations cpuinfo_op
= {