diff options
Diffstat (limited to 'arch/arm64/kernel/setup.c')
| -rw-r--r-- | arch/arm64/kernel/setup.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index cd4eb7ee618c..d1e01e6498bb 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -63,6 +63,7 @@ #include <asm/memblock.h> #include <asm/efi.h> #include <asm/xen/hypervisor.h> +#include <asm/mmu_context.h> unsigned int boot_reason; EXPORT_SYMBOL(boot_reason); @@ -327,6 +328,12 @@ void __init setup_arch(char **cmdline_p) */ local_async_enable(); + /* + * TTBR0 is only used for the identity mapping at this stage. Make it + * point to zero page to avoid speculatively fetching new entries. + */ + cpu_uninstall_idmap(); + efi_init(); arm64_memblock_init(); @@ -402,3 +409,32 @@ 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; } + +/* + * Dump out kernel offset information on panic. + */ +static int dump_kernel_offset(struct notifier_block *self, unsigned long v, + void *p) +{ + u64 const kaslr_offset = kimage_vaddr - KIMAGE_VADDR; + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset > 0) { + pr_emerg("Kernel Offset: 0x%llx from 0x%lx\n", + kaslr_offset, KIMAGE_VADDR); + } else { + pr_emerg("Kernel Offset: disabled\n"); + } + return 0; +} + +static struct notifier_block kernel_offset_notifier = { + .notifier_call = dump_kernel_offset +}; + +static int __init register_kernel_offset_dumper(void) +{ + atomic_notifier_chain_register(&panic_notifier_list, + &kernel_offset_notifier); + return 0; +} +__initcall(register_kernel_offset_dumper); |