diff options
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d1f661425790..d7c467670be8 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -44,7 +44,7 @@ config RISCV select ARCH_USE_QUEUED_RWLOCKS select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_FRAME_POINTERS - select ARCH_WANT_GENERAL_HUGETLB + select ARCH_WANT_GENERAL_HUGETLB if !RISCV_ISA_SVNAPOT select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP select ARCH_WANT_HUGE_PMD_SHARE if 64BIT select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL @@ -60,6 +60,7 @@ config RISCV select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_EARLY_IOREMAP + select GENERIC_ENTRY select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO select GENERIC_IDLE_POLL_SETUP select GENERIC_IOREMAP if MMU @@ -245,7 +246,7 @@ config AS_HAS_INSN def_bool $(as-instr,.insn r 51$(comma) 0$(comma) 0$(comma) t0$(comma) t0$(comma) zero) source "arch/riscv/Kconfig.socs" -source "arch/riscv/Kconfig.erratas" +source "arch/riscv/Kconfig.errata" menu "Platform type" @@ -377,9 +378,9 @@ config RISCV_ALTERNATIVE depends on !XIP_KERNEL help This Kconfig allows the kernel to automatically patch the - errata required by the execution platform at run time. The - code patching is performed once in the boot stages. It means - that the overhead from this mechanism is just taken once. + erratum or cpufeature required by the execution platform at run + time. The code patching overhead is minimal, as it's only done + once at boot and once on each module load. config RISCV_ALTERNATIVE_EARLY bool @@ -397,6 +398,25 @@ config RISCV_ISA_C If you don't know what to do here, say Y. +config RISCV_ISA_SVNAPOT + bool "SVNAPOT extension support" + depends on 64BIT && MMU + default y + select RISCV_ALTERNATIVE + help + Allow kernel to detect the SVNAPOT ISA-extension dynamically at boot + time and enable its usage. + + The SVNAPOT extension is used to mark contiguous PTEs as a range + of contiguous virtual-to-physical translations for a naturally + aligned power-of-2 (NAPOT) granularity larger than the base 4KB page + size. When HUGETLBFS is also selected this option unconditionally + allocates some memory for each NAPOT page size supported by the kernel. + When optimizing for low memory consumption and for platforms without + the SVNAPOT extension, it may be better to say N here. + + If you don't know what to do here, say Y. + config RISCV_ISA_SVPBMT bool "SVPBMT extension support" depends on 64BIT && MMU @@ -456,6 +476,19 @@ config RISCV_ISA_ZICBOM If you don't know what to do here, say Y. +config RISCV_ISA_ZICBOZ + bool "Zicboz extension support for faster zeroing of memory" + depends on !XIP_KERNEL && MMU + select RISCV_ALTERNATIVE + default y + help + Enable the use of the ZICBOZ extension (cbo.zero instruction) + when available. + + The Zicboz extension is used for faster zeroing of memory. + + If you don't know what to do here, say Y. + config TOOLCHAIN_HAS_ZIHINTPAUSE bool default y |