mirror of https://gitee.com/openkylin/linux.git
62a679cb28
Currently __cpu_setup conditionally initializes the address authentication keys and enables them in SCTLR_EL1, doing so differently for the primary CPU and secondary CPUs, and skipping this work for CPUs returning from an idle state. For the latter case, cpu_do_resume restores the keys and SCTLR_EL1 value after the MMU has been enabled. This flow is rather difficult to follow, so instead let's move the primary and secondary CPU initialization into their respective boot paths. By following the example of cpu_do_resume and doing so once the MMU is enabled, we can always initialize the keys from the values in thread_struct, and avoid the machinery necessary to pass the keys in secondary_data or open-coding initialization for the boot CPU. This means we perform an additional RMW of SCTLR_EL1, but we already do this in the cpu_do_resume path, and for other features in cpufeature.c, so this isn't a major concern in a bringup path. Note that even while the enable bits are clear, the key registers are accessible. As this now renders the argument to __cpu_setup redundant, let's also remove that entirely. Future extensions can follow a similar approach to initialize values that differ for primary/secondary CPUs. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Reviewed-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Cc: Amit Daniel Kachhap <amit.kachhap@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20200423101606.37601-3-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org> |
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| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.