CONFIG_RISCV_ISA_ZBB: Zbb extension support for bit manipulation instructions

General informations

The Linux kernel configuration item CONFIG_RISCV_ISA_ZBB:

• prompt: Zbb extension support for bit manipulation instructions
• type: bool
• depends on: CONFIG_RISCV_ALTERNATIVE
• defined in arch/riscv/Kconfig
• found in Linux kernels: 6.3–6.14, 6.15-rc+HEAD

Help text

Add support for enabling optimisations in the kernel when the Zbb extension is detected at boot. Some optimisations may additionally depend on toolchain support for Zbb.

The Zbb extension provides instructions to accelerate a number of bit-specific operations (count bit population, sign extending, bitrotation, etc).

If you don't know what to do here, say Y.

Hardware

LKDDb

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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