/arch/arm64/kernel/setup.c
C | 463 lines | 317 code | 73 blank | 73 comment | 19 complexity | abe8daec2e1522ff3c763857f932e472 MD5 | raw file
- /*
- * Based on arch/arm/kernel/setup.c
- *
- * Copyright (C) 1995-2001 Russell King
- * Copyright (C) 2012 ARM Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <linux/export.h>
- #include <linux/kernel.h>
- #include <linux/stddef.h>
- #include <linux/ioport.h>
- #include <linux/delay.h>
- #include <linux/utsname.h>
- #include <linux/initrd.h>
- #include <linux/console.h>
- #include <linux/bootmem.h>
- #include <linux/seq_file.h>
- #include <linux/screen_info.h>
- #include <linux/init.h>
- #include <linux/kexec.h>
- #include <linux/crash_dump.h>
- #include <linux/root_dev.h>
- #include <linux/clk-provider.h>
- #include <linux/cpu.h>
- #include <linux/interrupt.h>
- #include <linux/smp.h>
- #include <linux/fs.h>
- #include <linux/proc_fs.h>
- #include <linux/memblock.h>
- #include <linux/of_fdt.h>
- #include <linux/of_platform.h>
- #include <linux/dma-mapping.h>
- #include <asm/cputype.h>
- #include <asm/elf.h>
- #include <asm/cputable.h>
- #include <asm/cpu_ops.h>
- #include <asm/sections.h>
- #include <asm/setup.h>
- #include <asm/smp_plat.h>
- #include <asm/cacheflush.h>
- #include <asm/tlbflush.h>
- #include <asm/traps.h>
- #include <asm/memblock.h>
- #include <asm/psci.h>
- unsigned int processor_id;
- EXPORT_SYMBOL(processor_id);
- unsigned int elf_hwcap __read_mostly;
- EXPORT_SYMBOL_GPL(elf_hwcap);
- unsigned int boot_reason;
- EXPORT_SYMBOL(boot_reason);
- unsigned int cold_boot;
- EXPORT_SYMBOL(cold_boot);
- static const char *cpu_name;
- static const char *machine_name;
- phys_addr_t __fdt_pointer __initdata;
- /*
- * Standard memory resources
- */
- static struct resource mem_res[] = {
- {
- .name = "Kernel code",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_MEM
- },
- {
- .name = "Kernel data",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_MEM
- }
- };
- #define kernel_code mem_res[0]
- #define kernel_data mem_res[1]
- void __init early_print(const char *str, ...)
- {
- char buf[256];
- va_list ap;
- va_start(ap, str);
- vsnprintf(buf, sizeof(buf), str, ap);
- va_end(ap);
- printk("%s", buf);
- }
- bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
- {
- return phys_id == cpu_logical_map(cpu);
- }
- struct mpidr_hash mpidr_hash;
- #ifdef CONFIG_SMP
- /**
- * smp_build_mpidr_hash - Pre-compute shifts required at each affinity
- * level in order to build a linear index from an
- * MPIDR value. Resulting algorithm is a collision
- * free hash carried out through shifting and ORing
- */
- static void __init smp_build_mpidr_hash(void)
- {
- u32 i, affinity, fs[4], bits[4], ls;
- u64 mask = 0;
- /*
- * Pre-scan the list of MPIDRS and filter out bits that do
- * not contribute to affinity levels, ie they never toggle.
- */
- for_each_possible_cpu(i)
- mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
- pr_debug("mask of set bits %#llx\n", mask);
- /*
- * Find and stash the last and first bit set at all affinity levels to
- * check how many bits are required to represent them.
- */
- for (i = 0; i < 4; i++) {
- affinity = MPIDR_AFFINITY_LEVEL(mask, i);
- /*
- * Find the MSB bit and LSB bits position
- * to determine how many bits are required
- * to express the affinity level.
- */
- ls = fls(affinity);
- fs[i] = affinity ? ffs(affinity) - 1 : 0;
- bits[i] = ls - fs[i];
- }
- /*
- * An index can be created from the MPIDR_EL1 by isolating the
- * significant bits at each affinity level and by shifting
- * them in order to compress the 32 bits values space to a
- * compressed set of values. This is equivalent to hashing
- * the MPIDR_EL1 through shifting and ORing. It is a collision free
- * hash though not minimal since some levels might contain a number
- * of CPUs that is not an exact power of 2 and their bit
- * representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}.
- */
- mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
- mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
- mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
- (bits[1] + bits[0]);
- mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
- fs[3] - (bits[2] + bits[1] + bits[0]);
- mpidr_hash.mask = mask;
- mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
- pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
- mpidr_hash.shift_aff[0],
- mpidr_hash.shift_aff[1],
- mpidr_hash.shift_aff[2],
- mpidr_hash.shift_aff[3],
- mpidr_hash.mask,
- mpidr_hash.bits);
- /*
- * 4x is an arbitrary value used to warn on a hash table much bigger
- * than expected on most systems.
- */
- if (mpidr_hash_size() > 4 * num_possible_cpus())
- pr_warn("Large number of MPIDR hash buckets detected\n");
- __flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash));
- }
- #endif
- static void __init setup_processor(void)
- {
- struct cpu_info *cpu_info;
- /*
- * locate processor in the list of supported processor
- * types. The linker builds this table for us from the
- * entries in arch/arm/mm/proc.S
- */
- cpu_info = lookup_processor_type(read_cpuid_id());
- if (!cpu_info) {
- printk("CPU configuration botched (ID %08x), unable to continue.\n",
- read_cpuid_id());
- while (1);
- }
- cpu_name = cpu_info->cpu_name;
- printk("CPU: %s [%08x] revision %d\n",
- cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
- sprintf(init_utsname()->machine, "aarch64");
- elf_hwcap = 0;
- }
- static void __init setup_machine_fdt(phys_addr_t dt_phys)
- {
- struct boot_param_header *devtree;
- unsigned long dt_root;
- /* Check we have a non-NULL DT pointer */
- if (!dt_phys) {
- early_print("\n"
- "Error: NULL or invalid device tree blob\n"
- "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
- "\nPlease check your bootloader.\n");
- while (true)
- cpu_relax();
- }
- devtree = phys_to_virt(dt_phys);
- /* Check device tree validity */
- if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
- early_print("\n"
- "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
- "Expected 0x%x, found 0x%x\n"
- "\nPlease check your bootloader.\n",
- dt_phys, devtree, OF_DT_HEADER,
- be32_to_cpu(devtree->magic));
- while (true)
- cpu_relax();
- }
- initial_boot_params = devtree;
- dt_root = of_get_flat_dt_root();
- machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
- if (!machine_name)
- machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
- if (!machine_name)
- machine_name = "<unknown>";
- pr_info("Machine: %s\n", machine_name);
- /* Retrieve various information from the /chosen node */
- of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
- /* Initialize {size,address}-cells info */
- of_scan_flat_dt(early_init_dt_scan_root, NULL);
- /* Setup memory, calling early_init_dt_add_memory_arch */
- of_scan_flat_dt(early_init_dt_scan_memory, NULL);
- }
- void __init early_init_dt_add_memory_arch(u64 base, u64 size)
- {
- base &= PAGE_MASK;
- size &= PAGE_MASK;
- if (base + size < PHYS_OFFSET) {
- pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
- base, base + size);
- return;
- }
- if (base < PHYS_OFFSET) {
- pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
- base, PHYS_OFFSET);
- size -= PHYS_OFFSET - base;
- base = PHYS_OFFSET;
- }
- memblock_add(base, size);
- }
- void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
- {
- return __va(memblock_alloc(size, align));
- }
- /*
- * Limit the memory size that was specified via FDT.
- */
- static int __init early_mem(char *p)
- {
- phys_addr_t limit;
- if (!p)
- return 1;
- limit = memparse(p, &p) & PAGE_MASK;
- pr_notice("Memory limited to %lldMB\n", limit >> 20);
- memblock_enforce_memory_limit(limit);
- return 0;
- }
- early_param("mem", early_mem);
- static void __init request_standard_resources(void)
- {
- struct memblock_region *region;
- struct resource *res;
- kernel_code.start = virt_to_phys(_text);
- kernel_code.end = virt_to_phys(_etext - 1);
- kernel_data.start = virt_to_phys(_sdata);
- kernel_data.end = virt_to_phys(_end - 1);
- for_each_memblock(memory, region) {
- res = alloc_bootmem_low(sizeof(*res));
- res->name = "System RAM";
- res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
- res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
- res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- request_resource(&iomem_resource, res);
- if (kernel_code.start >= res->start &&
- kernel_code.end <= res->end)
- request_resource(res, &kernel_code);
- if (kernel_data.start >= res->start &&
- kernel_data.end <= res->end)
- request_resource(res, &kernel_data);
- }
- }
- u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
- void __init setup_arch(char **cmdline_p)
- {
- setup_processor();
- setup_machine_fdt(__fdt_pointer);
- init_mm.start_code = (unsigned long) _text;
- init_mm.end_code = (unsigned long) _etext;
- init_mm.end_data = (unsigned long) _edata;
- init_mm.brk = (unsigned long) _end;
- *cmdline_p = boot_command_line;
- parse_early_param();
- arm64_memblock_init();
- paging_init();
- request_standard_resources();
- unflatten_device_tree();
- psci_init();
- cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
- cpu_read_bootcpu_ops();
- #ifdef CONFIG_SMP
- smp_init_cpus();
- smp_build_mpidr_hash();
- #endif
- #ifdef CONFIG_VT
- #if defined(CONFIG_VGA_CONSOLE)
- conswitchp = &vga_con;
- #elif defined(CONFIG_DUMMY_CONSOLE)
- conswitchp = &dummy_con;
- #endif
- #endif
- }
- static int __init arm64_device_init(void)
- {
- of_clk_init(NULL);
- of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
- return 0;
- }
- arch_initcall(arm64_device_init);
- static DEFINE_PER_CPU(struct cpu, cpu_data);
- static int __init topology_init(void)
- {
- int i;
- for_each_possible_cpu(i) {
- struct cpu *cpu = &per_cpu(cpu_data, i);
- cpu->hotpluggable = 1;
- register_cpu(cpu, i);
- }
- return 0;
- }
- subsys_initcall(topology_init);
- static const char *hwcap_str[] = {
- "fp",
- "asimd",
- NULL
- };
- static int c_show(struct seq_file *m, void *v)
- {
- int i;
- seq_printf(m, "Processor\t: %s rev %d (%s)\n",
- cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
- for_each_online_cpu(i) {
- /*
- * glibc reads /proc/cpuinfo to determine the number of
- * online processors, looking for lines beginning with
- * "processor". Give glibc what it expects.
- */
- #ifdef CONFIG_SMP
- seq_printf(m, "processor\t: %d\n", i);
- #endif
- }
- /* dump out the processor features */
- seq_puts(m, "Features\t: ");
- for (i = 0; hwcap_str[i]; i++)
- if (elf_hwcap & (1 << i))
- seq_printf(m, "%s ", hwcap_str[i]);
- seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
- seq_printf(m, "CPU architecture: AArch64\n");
- seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
- seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
- seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
- seq_puts(m, "\n");
- seq_printf(m, "Hardware\t: %s\n", machine_name);
- return 0;
- }
- static void *c_start(struct seq_file *m, loff_t *pos)
- {
- return *pos < 1 ? (void *)1 : NULL;
- }
- static void *c_next(struct seq_file *m, void *v, loff_t *pos)
- {
- ++*pos;
- return NULL;
- }
- static void c_stop(struct seq_file *m, void *v)
- {
- }
- const struct seq_operations cpuinfo_op = {
- .start = c_start,
- .next = c_next,
- .stop = c_stop,
- .show = c_show
- };
- void arch_setup_pdev_archdata(struct platform_device *pdev)
- {
- pdev->archdata.dma_mask = DMA_BIT_MASK(32);
- pdev->dev.dma_mask = &pdev->archdata.dma_mask;
- }