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/export.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/kexec.h>
23 #include <linux/of_fdt.h>
24 #include <linux/cpu.h>
25 #include <linux/interrupt.h>
26 #include <linux/smp.h>
27 #include <linux/proc_fs.h>
28 #include <linux/memblock.h>
29 #include <linux/bug.h>
30 #include <linux/compiler.h>
31 #include <linux/sort.h>
33 #include <asm/unified.h>
36 #include <asm/cputype.h>
38 #include <asm/procinfo.h>
39 #include <asm/sections.h>
40 #include <asm/setup.h>
41 #include <asm/smp_plat.h>
42 #include <asm/mach-types.h>
43 #include <asm/cacheflush.h>
44 #include <asm/cachetype.h>
45 #include <asm/tlbflush.h>
48 #include <asm/mach/arch.h>
49 #include <asm/mach/irq.h>
50 #include <asm/mach/time.h>
51 #include <asm/system_info.h>
52 #include <asm/system_misc.h>
53 #include <asm/traps.h>
54 #include <asm/unwind.h>
55 #include <asm/memblock.h>
61 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
64 static int __init fpe_setup(char *line)
66 memcpy(fpe_type, line, 8);
70 __setup("fpe=", fpe_setup);
73 extern void paging_init(struct machine_desc *desc);
74 extern void sanity_check_meminfo(void);
75 extern void reboot_setup(char *str);
76 extern void setup_dma_zone(struct machine_desc *desc);
78 unsigned int processor_id;
79 EXPORT_SYMBOL(processor_id);
80 unsigned int __machine_arch_type __read_mostly;
81 EXPORT_SYMBOL(__machine_arch_type);
82 unsigned int cacheid __read_mostly;
83 EXPORT_SYMBOL(cacheid);
85 unsigned int __atags_pointer __initdata;
87 unsigned int system_rev;
88 EXPORT_SYMBOL(system_rev);
90 unsigned int system_serial_low;
91 EXPORT_SYMBOL(system_serial_low);
93 unsigned int system_serial_high;
94 EXPORT_SYMBOL(system_serial_high);
96 unsigned int elf_hwcap __read_mostly;
97 EXPORT_SYMBOL(elf_hwcap);
101 struct processor processor __read_mostly;
104 struct cpu_tlb_fns cpu_tlb __read_mostly;
107 struct cpu_user_fns cpu_user __read_mostly;
110 struct cpu_cache_fns cpu_cache __read_mostly;
112 #ifdef CONFIG_OUTER_CACHE
113 struct outer_cache_fns outer_cache __read_mostly;
114 EXPORT_SYMBOL(outer_cache);
118 * Cached cpu_architecture() result for use by assembler code.
119 * C code should use the cpu_architecture() function instead of accessing this
122 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
128 } ____cacheline_aligned;
130 static struct stack stacks[NR_CPUS];
132 char elf_platform[ELF_PLATFORM_SIZE];
133 EXPORT_SYMBOL(elf_platform);
135 static const char *cpu_name;
136 static const char *machine_name;
137 static char __initdata cmd_line[COMMAND_LINE_SIZE];
138 struct machine_desc *machine_desc __initdata;
140 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
141 #define ENDIANNESS ((char)endian_test.l)
143 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
146 * Standard memory resources
148 static struct resource mem_res[] = {
153 .flags = IORESOURCE_MEM
156 .name = "Kernel code",
159 .flags = IORESOURCE_MEM
162 .name = "Kernel data",
165 .flags = IORESOURCE_MEM
169 #define video_ram mem_res[0]
170 #define kernel_code mem_res[1]
171 #define kernel_data mem_res[2]
173 static struct resource io_res[] = {
178 .flags = IORESOURCE_IO | IORESOURCE_BUSY
184 .flags = IORESOURCE_IO | IORESOURCE_BUSY
190 .flags = IORESOURCE_IO | IORESOURCE_BUSY
194 #define lp0 io_res[0]
195 #define lp1 io_res[1]
196 #define lp2 io_res[2]
198 static const char *proc_arch[] = {
218 static int __get_cpu_architecture(void)
222 if ((read_cpuid_id() & 0x0008f000) == 0) {
223 cpu_arch = CPU_ARCH_UNKNOWN;
224 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
225 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
226 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
227 cpu_arch = (read_cpuid_id() >> 16) & 7;
229 cpu_arch += CPU_ARCH_ARMv3;
230 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
233 /* Revised CPUID format. Read the Memory Model Feature
234 * Register 0 and check for VMSAv7 or PMSAv7 */
235 asm("mrc p15, 0, %0, c0, c1, 4"
237 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
238 (mmfr0 & 0x000000f0) >= 0x00000030)
239 cpu_arch = CPU_ARCH_ARMv7;
240 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
241 (mmfr0 & 0x000000f0) == 0x00000020)
242 cpu_arch = CPU_ARCH_ARMv6;
244 cpu_arch = CPU_ARCH_UNKNOWN;
246 cpu_arch = CPU_ARCH_UNKNOWN;
251 int __pure cpu_architecture(void)
253 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
255 return __cpu_architecture;
258 static int cpu_has_aliasing_icache(unsigned int arch)
261 unsigned int id_reg, num_sets, line_size;
263 /* PIPT caches never alias. */
264 if (icache_is_pipt())
267 /* arch specifies the register format */
270 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
271 : /* No output operands */
274 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
276 line_size = 4 << ((id_reg & 0x7) + 2);
277 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
278 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
281 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
284 /* I-cache aliases will be handled by D-cache aliasing code */
288 return aliasing_icache;
291 static void __init cacheid_init(void)
293 unsigned int cachetype = read_cpuid_cachetype();
294 unsigned int arch = cpu_architecture();
296 if (arch >= CPU_ARCH_ARMv6) {
297 if ((cachetype & (7 << 29)) == 4 << 29) {
298 /* ARMv7 register format */
299 arch = CPU_ARCH_ARMv7;
300 cacheid = CACHEID_VIPT_NONALIASING;
301 switch (cachetype & (3 << 14)) {
303 cacheid |= CACHEID_ASID_TAGGED;
306 cacheid |= CACHEID_PIPT;
310 arch = CPU_ARCH_ARMv6;
311 if (cachetype & (1 << 23))
312 cacheid = CACHEID_VIPT_ALIASING;
314 cacheid = CACHEID_VIPT_NONALIASING;
316 if (cpu_has_aliasing_icache(arch))
317 cacheid |= CACHEID_VIPT_I_ALIASING;
319 cacheid = CACHEID_VIVT;
322 printk("CPU: %s data cache, %s instruction cache\n",
323 cache_is_vivt() ? "VIVT" :
324 cache_is_vipt_aliasing() ? "VIPT aliasing" :
325 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
326 cache_is_vivt() ? "VIVT" :
327 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
328 icache_is_vipt_aliasing() ? "VIPT aliasing" :
329 icache_is_pipt() ? "PIPT" :
330 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
334 * These functions re-use the assembly code in head.S, which
335 * already provide the required functionality.
337 extern struct proc_info_list *lookup_processor_type(unsigned int);
339 void __init early_print(const char *str, ...)
341 extern void printascii(const char *);
346 vsnprintf(buf, sizeof(buf), str, ap);
349 #ifdef CONFIG_DEBUG_LL
355 static void __init feat_v6_fixup(void)
357 int id = read_cpuid_id();
359 if ((id & 0xff0f0000) != 0x41070000)
363 * HWCAP_TLS is available only on 1136 r1p0 and later,
364 * see also kuser_get_tls_init.
366 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
367 elf_hwcap &= ~HWCAP_TLS;
371 * cpu_init - initialise one CPU.
373 * cpu_init sets up the per-CPU stacks.
377 unsigned int cpu = smp_processor_id();
378 struct stack *stk = &stacks[cpu];
380 if (cpu >= NR_CPUS) {
381 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
388 * Define the placement constraint for the inline asm directive below.
389 * In Thumb-2, msr with an immediate value is not allowed.
391 #ifdef CONFIG_THUMB2_KERNEL
398 * setup stacks for re-entrant exception handlers
402 "add r14, %0, %2\n\t"
405 "add r14, %0, %4\n\t"
408 "add r14, %0, %6\n\t"
413 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
414 "I" (offsetof(struct stack, irq[0])),
415 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
416 "I" (offsetof(struct stack, abt[0])),
417 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
418 "I" (offsetof(struct stack, und[0])),
419 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
423 int __cpu_logical_map[NR_CPUS];
425 void __init smp_setup_processor_id(void)
428 u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
430 cpu_logical_map(0) = cpu;
431 for (i = 1; i < NR_CPUS; ++i)
432 cpu_logical_map(i) = i == cpu ? 0 : i;
434 printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
437 static void __init setup_processor(void)
439 struct proc_info_list *list;
442 * locate processor in the list of supported processor
443 * types. The linker builds this table for us from the
444 * entries in arch/arm/mm/proc-*.S
446 list = lookup_processor_type(read_cpuid_id());
448 printk("CPU configuration botched (ID %08x), unable "
449 "to continue.\n", read_cpuid_id());
453 cpu_name = list->cpu_name;
454 __cpu_architecture = __get_cpu_architecture();
457 processor = *list->proc;
460 cpu_tlb = *list->tlb;
463 cpu_user = *list->user;
466 cpu_cache = *list->cache;
469 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
470 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
471 proc_arch[cpu_architecture()], cr_alignment);
473 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
474 list->arch_name, ENDIANNESS);
475 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
476 list->elf_name, ENDIANNESS);
477 elf_hwcap = list->elf_hwcap;
478 #ifndef CONFIG_ARM_THUMB
479 elf_hwcap &= ~HWCAP_THUMB;
488 void __init dump_machine_table(void)
490 struct machine_desc *p;
492 early_print("Available machine support:\n\nID (hex)\tNAME\n");
493 for_each_machine_desc(p)
494 early_print("%08x\t%s\n", p->nr, p->name);
496 early_print("\nPlease check your kernel config and/or bootloader.\n");
499 /* can't use cpu_relax() here as it may require MMU setup */;
502 int __init arm_add_memory(phys_addr_t start, phys_addr_t size)
504 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
506 if (meminfo.nr_banks >= NR_BANKS) {
507 printk(KERN_CRIT "NR_BANKS too low, "
508 "ignoring memory at 0x%08llx\n", (long long)start);
513 * Ensure that start/size are aligned to a page boundary.
514 * Size is appropriately rounded down, start is rounded up.
516 size -= start & ~PAGE_MASK;
517 bank->start = PAGE_ALIGN(start);
520 if (bank->start + size < bank->start) {
521 printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
522 "32-bit physical address space\n", (long long)start);
524 * To ensure bank->start + bank->size is representable in
525 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
526 * This means we lose a page after masking.
528 size = ULONG_MAX - bank->start;
532 bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1);
535 * Check whether this memory region has non-zero size or
536 * invalid node number.
546 * Pick out the memory size. We look for mem=size@start,
547 * where start and size are "size[KkMm]"
549 static int __init early_mem(char *p)
551 static int usermem __initdata = 0;
557 * If the user specifies memory size, we
558 * blow away any automatically generated
563 meminfo.nr_banks = 0;
567 size = memparse(p, &endp);
569 start = memparse(endp + 1, NULL);
571 arm_add_memory(start, size);
575 early_param("mem", early_mem);
577 static void __init request_standard_resources(struct machine_desc *mdesc)
579 struct memblock_region *region;
580 struct resource *res;
582 kernel_code.start = virt_to_phys(_text);
583 kernel_code.end = virt_to_phys(_etext - 1);
584 kernel_data.start = virt_to_phys(_sdata);
585 kernel_data.end = virt_to_phys(_end - 1);
587 for_each_memblock(memory, region) {
588 res = alloc_bootmem_low(sizeof(*res));
589 res->name = "System RAM";
590 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
591 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
592 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
594 request_resource(&iomem_resource, res);
596 if (kernel_code.start >= res->start &&
597 kernel_code.end <= res->end)
598 request_resource(res, &kernel_code);
599 if (kernel_data.start >= res->start &&
600 kernel_data.end <= res->end)
601 request_resource(res, &kernel_data);
604 if (mdesc->video_start) {
605 video_ram.start = mdesc->video_start;
606 video_ram.end = mdesc->video_end;
607 request_resource(&iomem_resource, &video_ram);
611 * Some machines don't have the possibility of ever
612 * possessing lp0, lp1 or lp2
614 if (mdesc->reserve_lp0)
615 request_resource(&ioport_resource, &lp0);
616 if (mdesc->reserve_lp1)
617 request_resource(&ioport_resource, &lp1);
618 if (mdesc->reserve_lp2)
619 request_resource(&ioport_resource, &lp2);
622 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
623 struct screen_info screen_info = {
624 .orig_video_lines = 30,
625 .orig_video_cols = 80,
626 .orig_video_mode = 0,
627 .orig_video_ega_bx = 0,
628 .orig_video_isVGA = 1,
629 .orig_video_points = 8
633 static int __init customize_machine(void)
635 /* customizes platform devices, or adds new ones */
636 if (machine_desc->init_machine)
637 machine_desc->init_machine();
640 arch_initcall(customize_machine);
642 static int __init init_machine_late(void)
644 if (machine_desc->init_late)
645 machine_desc->init_late();
648 late_initcall(init_machine_late);
651 static inline unsigned long long get_total_mem(void)
655 total = max_low_pfn - min_low_pfn;
656 return total << PAGE_SHIFT;
660 * reserve_crashkernel() - reserves memory are for crash kernel
662 * This function reserves memory area given in "crashkernel=" kernel command
663 * line parameter. The memory reserved is used by a dump capture kernel when
664 * primary kernel is crashing.
666 static void __init reserve_crashkernel(void)
668 unsigned long long crash_size, crash_base;
669 unsigned long long total_mem;
672 total_mem = get_total_mem();
673 ret = parse_crashkernel(boot_command_line, total_mem,
674 &crash_size, &crash_base);
678 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
680 printk(KERN_WARNING "crashkernel reservation failed - "
681 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
685 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
686 "for crashkernel (System RAM: %ldMB)\n",
687 (unsigned long)(crash_size >> 20),
688 (unsigned long)(crash_base >> 20),
689 (unsigned long)(total_mem >> 20));
691 crashk_res.start = crash_base;
692 crashk_res.end = crash_base + crash_size - 1;
693 insert_resource(&iomem_resource, &crashk_res);
696 static inline void reserve_crashkernel(void) {}
697 #endif /* CONFIG_KEXEC */
699 static int __init meminfo_cmp(const void *_a, const void *_b)
701 const struct membank *a = _a, *b = _b;
702 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
703 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
706 void __init setup_arch(char **cmdline_p)
708 struct machine_desc *mdesc;
711 mdesc = setup_machine_fdt(__atags_pointer);
713 mdesc = setup_machine_tags(__atags_pointer, machine_arch_type);
714 machine_desc = mdesc;
715 machine_name = mdesc->name;
717 setup_dma_zone(mdesc);
719 if (mdesc->restart_mode)
720 reboot_setup(&mdesc->restart_mode);
722 init_mm.start_code = (unsigned long) _text;
723 init_mm.end_code = (unsigned long) _etext;
724 init_mm.end_data = (unsigned long) _edata;
725 init_mm.brk = (unsigned long) _end;
727 /* populate cmd_line too for later use, preserving boot_command_line */
728 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
729 *cmdline_p = cmd_line;
733 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
734 sanity_check_meminfo();
735 arm_memblock_init(&meminfo, mdesc);
738 request_standard_resources(mdesc);
741 arm_pm_restart = mdesc->restart;
743 unflatten_device_tree();
747 smp_set_ops(mdesc->smp);
751 reserve_crashkernel();
755 #ifdef CONFIG_MULTI_IRQ_HANDLER
756 handle_arch_irq = mdesc->handle_irq;
760 #if defined(CONFIG_VGA_CONSOLE)
761 conswitchp = &vga_con;
762 #elif defined(CONFIG_DUMMY_CONSOLE)
763 conswitchp = &dummy_con;
767 if (mdesc->init_early)
772 static int __init topology_init(void)
776 for_each_possible_cpu(cpu) {
777 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
778 cpuinfo->cpu.hotpluggable = 1;
779 register_cpu(&cpuinfo->cpu, cpu);
784 subsys_initcall(topology_init);
786 #ifdef CONFIG_HAVE_PROC_CPU
787 static int __init proc_cpu_init(void)
789 struct proc_dir_entry *res;
791 res = proc_mkdir("cpu", NULL);
796 fs_initcall(proc_cpu_init);
799 static const char *hwcap_str[] = {
822 static int c_show(struct seq_file *m, void *v)
826 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
827 cpu_name, read_cpuid_id() & 15, elf_platform);
829 #if defined(CONFIG_SMP)
830 for_each_online_cpu(i) {
832 * glibc reads /proc/cpuinfo to determine the number of
833 * online processors, looking for lines beginning with
834 * "processor". Give glibc what it expects.
836 seq_printf(m, "processor\t: %d\n", i);
837 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
838 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
839 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
841 #else /* CONFIG_SMP */
842 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
843 loops_per_jiffy / (500000/HZ),
844 (loops_per_jiffy / (5000/HZ)) % 100);
847 /* dump out the processor features */
848 seq_puts(m, "Features\t: ");
850 for (i = 0; hwcap_str[i]; i++)
851 if (elf_hwcap & (1 << i))
852 seq_printf(m, "%s ", hwcap_str[i]);
854 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
855 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
857 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
859 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
861 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
863 seq_printf(m, "CPU variant\t: 0x%02x\n",
864 (read_cpuid_id() >> 16) & 127);
867 seq_printf(m, "CPU variant\t: 0x%x\n",
868 (read_cpuid_id() >> 20) & 15);
870 seq_printf(m, "CPU part\t: 0x%03x\n",
871 (read_cpuid_id() >> 4) & 0xfff);
873 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
877 seq_printf(m, "Hardware\t: %s\n", machine_name);
878 seq_printf(m, "Revision\t: %04x\n", system_rev);
879 seq_printf(m, "Serial\t\t: %08x%08x\n",
880 system_serial_high, system_serial_low);
885 static void *c_start(struct seq_file *m, loff_t *pos)
887 return *pos < 1 ? (void *)1 : NULL;
890 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
896 static void c_stop(struct seq_file *m, void *v)
900 const struct seq_operations cpuinfo_op = {