在 2025-12-02星期二的 07:15 +0100，Heinrich Schuchardt写道： > On 12/2/25 06:28, Icenowy Zheng wrote: > > 在 2025-12-02星期二的 03:57 +0000，Yao Zi写道： > > > On Mon, Dec 01, 2025 at 06:49:03PM +0100, Heinrich Schuchardt > > > wrote: > > > > The following functions are provided: > > > > > > > > Count leading zero bits > > > > > > > > * int __clzsi2 (unsigned int a) > > > > * int __clzdi2 (unsigned long a) > > > > * int __clzti2 (unsigned long long a) > > > > > > > > Count trailing zero bits > > > > > > > > * int __ctzsi2 (unsigned int a) > > > > * int __ctzdi2 (unsigned long a) > > > > * int __ctzti2 (unsigned long long a) > > > > > > > > Signed-off-by: Heinrich Schuchardt > > > > <[email protected]> > > > > --- > > > > > > I noted there's another series with the same subject[1] sent > > > almost > > > at > > > the same time, and I couldn't tell the difference at the first > > > glance. > > > Is this an incident? > > > > > > > arch/Kconfig | 1 + > > > > arch/riscv/lib/Makefile | 2 + > > > > arch/riscv/lib/clz.c | 105 > > > > ++++++++++++++++++++++++++++++++++++++++ > > > > arch/riscv/lib/ctz.c | 95 > > > > ++++++++++++++++++++++++++++++++++++ > > > > lib/Kconfig | 2 +- > > > > 5 files changed, 204 insertions(+), 1 deletion(-) > > > > create mode 100644 arch/riscv/lib/clz.c > > > > create mode 100644 arch/riscv/lib/ctz.c > > > > > > > > diff --git a/arch/Kconfig b/arch/Kconfig > > > > index 3133f892f94..4af0da2485f 100644 > > > > --- a/arch/Kconfig > > > > +++ b/arch/Kconfig > > > > @@ -159,6 +159,7 @@ config PPC > > > > config RISCV > > > > bool "RISC-V architecture" > > > > select CREATE_ARCH_SYMLINK > > > > + select HAVE_PRIVATE_LIBGCC if 64BIT > > > > > > Are 32-bit platforms excluded for lacking of enough library > > > functions? > > Yes. See > https://lore.kernel.org/u-boot/[email protected]/T/#mbf44c9f5073649bbf2e1368ffbeaec82680a268d > > > > Should we exclude !RISCV_ISA_F || !RISCV_ISA_D platforms as well? > > > Though > > libgcc.a as provided by distros assumes that you have the D and F > extensions. Either a specific libgcc.a will be needed or we will have > to > implement the missing functions in the private lib if such platforms. > > It would make more sense to set CONFIG_USE_PRIVATE_LIBGCC=n for such > platforms than setting CONFIG_HAVE_PRIVATE_LIBGCC=n. > > Which way we want to go can be decided when such platforms arrive. > > > > there's no in-tree 64-bit port without F/D extension. > > > > The S7 core in U74-MC complex seems to have only IMAC, no F/D. > The S7 core is not supported by U-Boot.
Well at least SPL is run on the S7 cores, although the SBI should keep the S7 core from being running main U-Boot. > > Best regards > > Heinrich > > > > > > > > > > select HAVE_SETJMP > > > > select HAVE_INITJMP > > > > select SUPPORT_ACPI > > > > > > Regards, > > > Yao Zi > > > > > > [1]: > > > https://lore.kernel.org/u-boot/[email protected]/ > > >
