From nobody Tue Feb 10 07:38:50 2026 Received: from luna.linkmauve.fr (luna.linkmauve.fr [82.65.109.163]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F9FC18DF9D; Wed, 4 Feb 2026 04:05:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=82.65.109.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770177912; cv=none; b=C3KZQ8duNQNNIWx0xNOT6hGa4zYzFR3jAzo/Abo4OsJWwhoeED68qJHcaoF7Ea+z8CvVUpda9Z38DXfFoxEzLALgQ1mpWyhSWBLOUyDq1+tQznkcHtgQICnQtMGZpZ3q0Xu/HVNJF3Q6uNX3C+Q+AvyZKESNp/6x3kDU4O6mr8g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770177912; c=relaxed/simple; bh=ID/e4DrwQ85n/9a+ACgHDCPIBAXh23ub43sRYUtSBO0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ji4c6k7MuqYE1qkZfXAZK/lBBKTtpjSNMkjpLC5OEVRDSJ5Yw01Qgnl5lGumiWv2iSZsTaGHKCn2QR2pc21brrkzvAOD+CDe9Ne+ww8pU39qBdE3Ze8+9qPT1fXwynJpRqz1S1GzJVWfUEBE5HT/YjP8h9yzzPygG2LYc1Vorcg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=linkmauve.fr; spf=pass smtp.mailfrom=linkmauve.fr; arc=none smtp.client-ip=82.65.109.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=linkmauve.fr Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linkmauve.fr Received: by luna.linkmauve.fr (Postfix, from userid 1000) id 10FA7F43B49; Wed, 04 Feb 2026 05:05:08 +0100 (CET) From: Link Mauve To: rust-for-linux@vger.kernel.org Cc: Link Mauve , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Srinivas Kandagatla , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Ard Biesheuvel , "Martin K. Petersen" , Eric Biggers , Greg Kroah-Hartman , Lyude Paul , Asahi Lina , Viresh Kumar , Lorenzo Stoakes , Tamir Duberstein , FUJITA Tomonori , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, officialTechflashYT@gmail.com, Ash Logan , Roberto Van Eeden , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= Subject: [PATCH v2 1/4] rust: io: Add big-endian read and write functions Date: Wed, 4 Feb 2026 05:04:58 +0100 Message-ID: <20260204040505.8447-2-linkmauve@linkmauve.fr> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260204040505.8447-1-linkmauve@linkmauve.fr> References: <20260204040505.8447-1-linkmauve@linkmauve.fr> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Another option would be to call u32::swap_bytes() on the data being read/written, but these helpers make the Rust code as ergonomic as the C code. Signed-off-by: Link Mauve --- rust/helpers/io.c | 34 ++++++++++++++++++++++++++++++++++ rust/kernel/io.rs | 18 ++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/rust/helpers/io.c b/rust/helpers/io.c index c475913c69e6..514ad0377327 100644 --- a/rust/helpers/io.c +++ b/rust/helpers/io.c @@ -40,6 +40,23 @@ u64 rust_helper_readq(const void __iomem *addr) } #endif =20 +u16 rust_helper_ioread16be(const void __iomem *addr) +{ + return ioread16be(addr); +} + +u32 rust_helper_ioread32be(const void __iomem *addr) +{ + return ioread32be(addr); +} + +#ifdef CONFIG_64BIT +u64 rust_helper_ioread64be(const void __iomem *addr) +{ + return ioread64be(addr); +} +#endif + void rust_helper_writeb(u8 value, void __iomem *addr) { writeb(value, addr); @@ -62,6 +79,23 @@ void rust_helper_writeq(u64 value, void __iomem *addr) } #endif =20 +void rust_helper_iowrite16be(u16 value, void __iomem *addr) +{ + iowrite16be(value, addr); +} + +void rust_helper_iowrite32be(u32 value, void __iomem *addr) +{ + iowrite32be(value, addr); +} + +#ifdef CONFIG_64BIT +void rust_helper_iowrite64be(u64 value, void __iomem *addr) +{ + iowrite64be(value, addr); +} +#endif + u8 rust_helper_readb_relaxed(const void __iomem *addr) { return readb_relaxed(addr); diff --git a/rust/kernel/io.rs b/rust/kernel/io.rs index 98e8b84e68d1..e6912e7ff036 100644 --- a/rust/kernel/io.rs +++ b/rust/kernel/io.rs @@ -256,6 +256,15 @@ fn io_addr_assert(&self, offset: usize) -> usize { readq -> u64 ); =20 + define_read!(read16be, try_read16be, ioread16be -> u16); + define_read!(read32be, try_read32be, ioread32be -> u32); + define_read!( + #[cfg(CONFIG_64BIT)] + read64be, + try_read64be, + ioread64be -> u64 + ); + define_read!(read8_relaxed, try_read8_relaxed, readb_relaxed -> u8); define_read!(read16_relaxed, try_read16_relaxed, readw_relaxed -> u16); define_read!(read32_relaxed, try_read32_relaxed, readl_relaxed -> u32); @@ -276,6 +285,15 @@ fn io_addr_assert(&self, offset: usize) -> usize { writeq <- u64 ); =20 + define_write!(write16be, try_write16be, iowrite16be <- u16); + define_write!(write32be, try_write32be, iowrite32be <- u32); + define_write!( + #[cfg(CONFIG_64BIT)] + write64be, + try_write64be, + iowrite64be <- u64 + ); + define_write!(write8_relaxed, try_write8_relaxed, writeb_relaxed <- u8= ); define_write!(write16_relaxed, try_write16_relaxed, writew_relaxed <- = u16); define_write!(write32_relaxed, try_write32_relaxed, writel_relaxed <- = u32); --=20 2.52.0