2 * Based on arch/arm/kernel/setup.c
4 * Copyright (C) 1995-2001 Russell King
5 * Copyright (C) 2012 ARM Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #include <linux/export.h>
21 #include <linux/kernel.h>
22 #include <linux/stddef.h>
23 #include <linux/ioport.h>
24 #include <linux/delay.h>
25 #include <linux/utsname.h>
26 #include <linux/initrd.h>
27 #include <linux/console.h>
28 #include <linux/bootmem.h>
29 #include <linux/seq_file.h>
30 #include <linux/screen_info.h>
31 #include <linux/init.h>
32 #include <linux/kexec.h>
33 #include <linux/crash_dump.h>
34 #include <linux/root_dev.h>
35 #include <linux/clk-provider.h>
36 #include <linux/cpu.h>
37 #include <linux/interrupt.h>
38 #include <linux/smp.h>
40 #include <linux/proc_fs.h>
41 #include <linux/memblock.h>
42 #include <linux/of_fdt.h>
43 #include <linux/of_platform.h>
44 #include <linux/efi.h>
46 #include <asm/fixmap.h>
47 #include <asm/cputype.h>
49 #include <asm/cputable.h>
50 #include <asm/cpu_ops.h>
51 #include <asm/sections.h>
52 #include <asm/setup.h>
53 #include <asm/smp_plat.h>
54 #include <asm/cacheflush.h>
55 #include <asm/tlbflush.h>
56 #include <asm/traps.h>
57 #include <asm/memblock.h>
61 unsigned int processor_id;
62 EXPORT_SYMBOL(processor_id);
64 unsigned long elf_hwcap __read_mostly;
65 EXPORT_SYMBOL_GPL(elf_hwcap);
68 #define COMPAT_ELF_HWCAP_DEFAULT \
69 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
70 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
71 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
72 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
73 COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
74 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
75 unsigned int compat_elf_hwcap2 __read_mostly;
78 static const char *cpu_name;
79 static const char *machine_name;
80 phys_addr_t __fdt_pointer __initdata;
83 * Standard memory resources
85 static struct resource mem_res[] = {
87 .name = "Kernel code",
90 .flags = IORESOURCE_MEM
93 .name = "Kernel data",
96 .flags = IORESOURCE_MEM
100 #define kernel_code mem_res[0]
101 #define kernel_data mem_res[1]
103 void __init early_print(const char *str, ...)
109 vsnprintf(buf, sizeof(buf), str, ap);
115 void __init smp_setup_processor_id(void)
118 * clear __my_cpu_offset on boot CPU to avoid hang caused by
119 * using percpu variable early, for example, lockdep will
120 * access percpu variable inside lock_release
122 set_my_cpu_offset(0);
125 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
127 return phys_id == cpu_logical_map(cpu);
130 struct mpidr_hash mpidr_hash;
133 * smp_build_mpidr_hash - Pre-compute shifts required at each affinity
134 * level in order to build a linear index from an
135 * MPIDR value. Resulting algorithm is a collision
136 * free hash carried out through shifting and ORing
138 static void __init smp_build_mpidr_hash(void)
140 u32 i, affinity, fs[4], bits[4], ls;
143 * Pre-scan the list of MPIDRS and filter out bits that do
144 * not contribute to affinity levels, ie they never toggle.
146 for_each_possible_cpu(i)
147 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
148 pr_debug("mask of set bits %#llx\n", mask);
150 * Find and stash the last and first bit set at all affinity levels to
151 * check how many bits are required to represent them.
153 for (i = 0; i < 4; i++) {
154 affinity = MPIDR_AFFINITY_LEVEL(mask, i);
156 * Find the MSB bit and LSB bits position
157 * to determine how many bits are required
158 * to express the affinity level.
161 fs[i] = affinity ? ffs(affinity) - 1 : 0;
162 bits[i] = ls - fs[i];
165 * An index can be created from the MPIDR_EL1 by isolating the
166 * significant bits at each affinity level and by shifting
167 * them in order to compress the 32 bits values space to a
168 * compressed set of values. This is equivalent to hashing
169 * the MPIDR_EL1 through shifting and ORing. It is a collision free
170 * hash though not minimal since some levels might contain a number
171 * of CPUs that is not an exact power of 2 and their bit
172 * representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}.
174 mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
175 mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
176 mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
178 mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
179 fs[3] - (bits[2] + bits[1] + bits[0]);
180 mpidr_hash.mask = mask;
181 mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
182 pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
183 mpidr_hash.shift_aff[0],
184 mpidr_hash.shift_aff[1],
185 mpidr_hash.shift_aff[2],
186 mpidr_hash.shift_aff[3],
190 * 4x is an arbitrary value used to warn on a hash table much bigger
191 * than expected on most systems.
193 if (mpidr_hash_size() > 4 * num_possible_cpus())
194 pr_warn("Large number of MPIDR hash buckets detected\n");
195 __flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash));
199 static void __init setup_processor(void)
201 struct cpu_info *cpu_info;
204 cpu_info = lookup_processor_type(read_cpuid_id());
206 printk("CPU configuration botched (ID %08x), unable to continue.\n",
211 cpu_name = cpu_info->cpu_name;
213 printk("CPU: %s [%08x] revision %d\n",
214 cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
216 sprintf(init_utsname()->machine, ELF_PLATFORM);
220 * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks.
221 * The blocks we test below represent incremental functionality
222 * for non-negative values. Negative values are reserved.
224 features = read_cpuid(ID_AA64ISAR0_EL1);
225 block = (features >> 4) & 0xf;
226 if (!(block & 0x8)) {
230 elf_hwcap |= HWCAP_PMULL;
232 elf_hwcap |= HWCAP_AES;
238 block = (features >> 8) & 0xf;
239 if (block && !(block & 0x8))
240 elf_hwcap |= HWCAP_SHA1;
242 block = (features >> 12) & 0xf;
243 if (block && !(block & 0x8))
244 elf_hwcap |= HWCAP_SHA2;
246 block = (features >> 16) & 0xf;
247 if (block && !(block & 0x8))
248 elf_hwcap |= HWCAP_CRC32;
252 * ID_ISAR5_EL1 carries similar information as above, but pertaining to
253 * the Aarch32 32-bit execution state.
255 features = read_cpuid(ID_ISAR5_EL1);
256 block = (features >> 4) & 0xf;
257 if (!(block & 0x8)) {
261 compat_elf_hwcap2 |= COMPAT_HWCAP2_PMULL;
263 compat_elf_hwcap2 |= COMPAT_HWCAP2_AES;
269 block = (features >> 8) & 0xf;
270 if (block && !(block & 0x8))
271 compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1;
273 block = (features >> 12) & 0xf;
274 if (block && !(block & 0x8))
275 compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2;
277 block = (features >> 16) & 0xf;
278 if (block && !(block & 0x8))
279 compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32;
283 static void __init setup_machine_fdt(phys_addr_t dt_phys)
285 struct boot_param_header *devtree;
286 unsigned long dt_root;
288 /* Check we have a non-NULL DT pointer */
291 "Error: NULL or invalid device tree blob\n"
292 "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
293 "\nPlease check your bootloader.\n");
300 devtree = phys_to_virt(dt_phys);
302 /* Check device tree validity */
303 if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
305 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
306 "Expected 0x%x, found 0x%x\n"
307 "\nPlease check your bootloader.\n",
308 dt_phys, devtree, OF_DT_HEADER,
309 be32_to_cpu(devtree->magic));
315 initial_boot_params = devtree;
316 dt_root = of_get_flat_dt_root();
318 machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
320 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
322 machine_name = "<unknown>";
323 pr_info("Machine: %s\n", machine_name);
325 /* Retrieve various information from the /chosen node */
326 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
327 /* Initialize {size,address}-cells info */
328 of_scan_flat_dt(early_init_dt_scan_root, NULL);
329 /* Setup memory, calling early_init_dt_add_memory_arch */
330 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
333 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
337 if (base + size < PHYS_OFFSET) {
338 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
342 if (base < PHYS_OFFSET) {
343 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
345 size -= PHYS_OFFSET - base;
348 memblock_add(base, size);
351 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
353 return __va(memblock_alloc(size, align));
357 * Limit the memory size that was specified via FDT.
359 static int __init early_mem(char *p)
366 limit = memparse(p, &p) & PAGE_MASK;
367 pr_notice("Memory limited to %lldMB\n", limit >> 20);
369 memblock_enforce_memory_limit(limit);
373 early_param("mem", early_mem);
375 static void __init request_standard_resources(void)
377 struct memblock_region *region;
378 struct resource *res;
380 kernel_code.start = virt_to_phys(_text);
381 kernel_code.end = virt_to_phys(_etext - 1);
382 kernel_data.start = virt_to_phys(_sdata);
383 kernel_data.end = virt_to_phys(_end - 1);
385 for_each_memblock(memory, region) {
386 res = alloc_bootmem_low(sizeof(*res));
387 res->name = "System RAM";
388 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
389 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
390 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
392 request_resource(&iomem_resource, res);
394 if (kernel_code.start >= res->start &&
395 kernel_code.end <= res->end)
396 request_resource(res, &kernel_code);
397 if (kernel_data.start >= res->start &&
398 kernel_data.end <= res->end)
399 request_resource(res, &kernel_data);
403 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
405 void __init setup_arch(char **cmdline_p)
409 setup_machine_fdt(__fdt_pointer);
411 init_mm.start_code = (unsigned long) _text;
412 init_mm.end_code = (unsigned long) _etext;
413 init_mm.end_data = (unsigned long) _edata;
414 init_mm.brk = (unsigned long) _end;
416 *cmdline_p = boot_command_line;
418 early_ioremap_init();
423 arm64_memblock_init();
426 request_standard_resources();
430 unflatten_device_tree();
434 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
435 cpu_read_bootcpu_ops();
438 smp_build_mpidr_hash();
442 #if defined(CONFIG_VGA_CONSOLE)
443 conswitchp = &vga_con;
444 #elif defined(CONFIG_DUMMY_CONSOLE)
445 conswitchp = &dummy_con;
450 static int __init arm64_device_init(void)
453 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
456 arch_initcall_sync(arm64_device_init);
458 static DEFINE_PER_CPU(struct cpu, cpu_data);
460 static int __init topology_init(void)
464 for_each_possible_cpu(i) {
465 struct cpu *cpu = &per_cpu(cpu_data, i);
466 cpu->hotpluggable = 1;
467 register_cpu(cpu, i);
472 subsys_initcall(topology_init);
474 static const char *hwcap_str[] = {
486 static int c_show(struct seq_file *m, void *v)
490 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
491 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
493 for_each_online_cpu(i) {
495 * glibc reads /proc/cpuinfo to determine the number of
496 * online processors, looking for lines beginning with
497 * "processor". Give glibc what it expects.
500 seq_printf(m, "processor\t: %d\n", i);
504 /* dump out the processor features */
505 seq_puts(m, "Features\t: ");
507 for (i = 0; hwcap_str[i]; i++)
508 if (elf_hwcap & (1 << i))
509 seq_printf(m, "%s ", hwcap_str[i]);
511 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
512 seq_printf(m, "CPU architecture: AArch64\n");
513 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
514 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
515 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
519 seq_printf(m, "Hardware\t: %s\n", machine_name);
524 static void *c_start(struct seq_file *m, loff_t *pos)
526 return *pos < 1 ? (void *)1 : NULL;
529 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
535 static void c_stop(struct seq_file *m, void *v)
539 const struct seq_operations cpuinfo_op = {