diff options
Diffstat (limited to 'arch/arm64/kernel/setup.c')
-rw-r--r-- | arch/arm64/kernel/setup.c | 159 |
1 files changed, 94 insertions, 65 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 56f664561754..42c690bb2d60 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -23,12 +23,14 @@ #include <linux/interrupt.h> #include <linux/smp.h> #include <linux/fs.h> +#include <linux/panic_notifier.h> #include <linux/proc_fs.h> #include <linux/memblock.h> #include <linux/of_fdt.h> #include <linux/efi.h> #include <linux/psci.h> #include <linux/sched/task.h> +#include <linux/scs.h> #include <linux/mm.h> #include <asm/acpi.h> @@ -41,6 +43,7 @@ #include <asm/cpu_ops.h> #include <asm/kasan.h> #include <asm/numa.h> +#include <asm/scs.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/smp_plat.h> @@ -55,6 +58,7 @@ static int num_standard_resources; static struct resource *standard_resources; phys_addr_t __fdt_pointer __initdata; +u64 mmu_enabled_at_boot __initdata; /* * Standard memory resources @@ -85,14 +89,8 @@ u64 __cacheline_aligned boot_args[4]; void __init smp_setup_processor_id(void) { u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK; - cpu_logical_map(0) = mpidr; + set_cpu_logical_map(0, mpidr); - /* - * clear __my_cpu_offset on boot CPU to avoid hang caused by - * using percpu variable early, for example, lockdep will - * access percpu variable inside lock_release - */ - set_my_cpu_offset(0); pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n", (unsigned long)mpidr, read_cpuid_id()); } @@ -168,6 +166,21 @@ static void __init smp_build_mpidr_hash(void) pr_warn("Large number of MPIDR hash buckets detected\n"); } +static void *early_fdt_ptr __initdata; + +void __init *get_early_fdt_ptr(void) +{ + return early_fdt_ptr; +} + +asmlinkage void __init early_fdt_map(u64 dt_phys) +{ + int fdt_size; + + early_fixmap_init(); + early_fdt_ptr = fixmap_remap_fdt(dt_phys, &fdt_size, PAGE_KERNEL); +} + static void __init setup_machine_fdt(phys_addr_t dt_phys) { int size; @@ -179,11 +192,16 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys) if (!dt_virt || !early_init_dt_scan(dt_virt)) { pr_crit("\n" - "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n" + "Error: invalid device tree blob at physical address %pa (virtual address 0x%px)\n" "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n" "\nPlease check your bootloader.", &dt_phys, dt_virt); + /* + * Note that in this _really_ early stage we cannot even BUG() + * or oops, so the least terrible thing to do is cpu_relax(), + * or else we could end-up printing non-initialized data, etc. + */ while (true) cpu_relax(); } @@ -206,10 +224,12 @@ static void __init request_standard_resources(void) unsigned long i = 0; size_t res_size; - kernel_code.start = __pa_symbol(_text); + kernel_code.start = __pa_symbol(_stext); kernel_code.end = __pa_symbol(__init_begin - 1); kernel_data.start = __pa_symbol(_sdata); kernel_data.end = __pa_symbol(_end - 1); + insert_resource(&iomem_resource, &kernel_code); + insert_resource(&iomem_resource, &kernel_data); num_standard_resources = memblock.memory.cnt; res_size = num_standard_resources * sizeof(*standard_resources); @@ -217,32 +237,21 @@ static void __init request_standard_resources(void) if (!standard_resources) panic("%s: Failed to allocate %zu bytes\n", __func__, res_size); - for_each_memblock(memory, region) { + for_each_mem_region(region) { res = &standard_resources[i++]; if (memblock_is_nomap(region)) { res->name = "reserved"; res->flags = IORESOURCE_MEM; + res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; } else { res->name = "System RAM"; res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; } - res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); - res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; - - 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); -#ifdef CONFIG_KEXEC_CORE - /* Userspace will find "Crash kernel" region in /proc/iomem. */ - if (crashk_res.end && crashk_res.start >= res->start && - crashk_res.end <= res->end) - request_resource(res, &crashk_res); -#endif + + insert_resource(&iomem_resource, res); } } @@ -257,7 +266,7 @@ static int __init reserve_memblock_reserved_regions(void) if (!memblock_is_region_reserved(mem->start, mem_size)) continue; - for_each_reserved_mem_region(j, &r_start, &r_end) { + for_each_reserved_mem_range(j, &r_start, &r_end) { resource_size_t start, end; start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); @@ -276,15 +285,26 @@ arch_initcall(reserve_memblock_reserved_regions); u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; -void __init setup_arch(char **cmdline_p) +u64 cpu_logical_map(unsigned int cpu) +{ + return __cpu_logical_map[cpu]; +} + +void __init __no_sanitize_address setup_arch(char **cmdline_p) { - 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; + setup_initial_init_mm(_stext, _etext, _edata, _end); *cmdline_p = boot_command_line; + kaslr_init(); + + /* + * If know now we are going to need KPTI then use non-global + * mappings from the start, avoiding the cost of rewriting + * everything later. + */ + arm64_use_ng_mappings = kaslr_requires_kpti(); + early_fixmap_init(); early_ioremap_init(); @@ -297,6 +317,8 @@ void __init setup_arch(char **cmdline_p) jump_label_init(); parse_early_param(); + dynamic_scs_init(); + /* * Unmask asynchronous aborts and fiq after bringing up possible * earlycon. (Report possible System Errors once we can report this @@ -312,6 +334,14 @@ void __init setup_arch(char **cmdline_p) xen_early_init(); efi_init(); + + if (!efi_enabled(EFI_BOOT)) { + if ((u64)_text % MIN_KIMG_ALIGN) + pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!"); + WARN_TAINT(mmu_enabled_at_boot, TAINT_FIRMWARE_WORKAROUND, + FW_BUG "Booted with MMU enabled!"); + } + arm64_memblock_init(); paging_init(); @@ -337,12 +367,12 @@ void __init setup_arch(char **cmdline_p) else psci_acpi_init(); - cpu_read_bootcpu_ops(); + init_bootcpu_ops(); smp_init_cpus(); smp_build_mpidr_hash(); /* Init percpu seeds for random tags after cpus are set up. */ - kasan_init_tags(); + kasan_init_sw_tags(); #ifdef CONFIG_ARM64_SW_TTBR0_PAN /* @@ -350,12 +380,9 @@ void __init setup_arch(char **cmdline_p) * faults in case uaccess_enable() is inadvertently called by the init * thread. */ - init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page); + init_task.thread_info.ttbr0 = phys_to_ttbr(__pa_symbol(reserved_pg_dir)); #endif -#ifdef CONFIG_VT - conswitchp = &dummy_con; -#endif if (boot_args[1] || boot_args[2] || boot_args[3]) { pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n" "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n" @@ -367,34 +394,20 @@ void __init setup_arch(char **cmdline_p) static inline bool cpu_can_disable(unsigned int cpu) { #ifdef CONFIG_HOTPLUG_CPU - if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_can_disable) - return cpu_ops[cpu]->cpu_can_disable(cpu); + const struct cpu_operations *ops = get_cpu_ops(cpu); + + if (ops && ops->cpu_can_disable) + return ops->cpu_can_disable(cpu); #endif return false; } -static int __init topology_init(void) +bool arch_cpu_is_hotpluggable(int num) { - int i; - - for_each_online_node(i) - register_one_node(i); - - for_each_possible_cpu(i) { - struct cpu *cpu = &per_cpu(cpu_data.cpu, i); - cpu->hotpluggable = cpu_can_disable(i); - register_cpu(cpu, i); - } - - return 0; + return cpu_can_disable(num); } -subsys_initcall(topology_init); -/* - * Dump out kernel offset information on panic. - */ -static int dump_kernel_offset(struct notifier_block *self, unsigned long v, - void *p) +static void dump_kernel_offset(void) { const unsigned long offset = kaslr_offset(); @@ -405,17 +418,33 @@ static int dump_kernel_offset(struct notifier_block *self, unsigned long v, } else { pr_emerg("Kernel Offset: disabled\n"); } +} + +static int arm64_panic_block_dump(struct notifier_block *self, + unsigned long v, void *p) +{ + dump_kernel_offset(); + dump_cpu_features(); + dump_mem_limit(); return 0; } -static struct notifier_block kernel_offset_notifier = { - .notifier_call = dump_kernel_offset +static struct notifier_block arm64_panic_block = { + .notifier_call = arm64_panic_block_dump }; -static int __init register_kernel_offset_dumper(void) +static int __init register_arm64_panic_block(void) { atomic_notifier_chain_register(&panic_notifier_list, - &kernel_offset_notifier); + &arm64_panic_block); + return 0; +} +device_initcall(register_arm64_panic_block); + +static int __init check_mmu_enabled_at_boot(void) +{ + if (!efi_enabled(EFI_BOOT) && mmu_enabled_at_boot) + panic("Non-EFI boot detected with MMU and caches enabled"); return 0; } -__initcall(register_kernel_offset_dumper); +device_initcall_sync(check_mmu_enabled_at_boot); |