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authorEric Biggers <ebiggers@google.com>2025-04-23 17:20:37 -0700
committerEric Biggers <ebiggers@google.com>2025-04-28 09:07:19 -0700
commitee858d83c59d95e08551a9dc270bedca4b72137d (patch)
tree8840827ec90c747342e1a7cbb59c5ab1ea95ccba /arch/sparc/lib/crc32.c
parentfa7ed85c9bdcd408fa5e85577a64a4d2a10dd807 (diff)
sparc/crc: drop "glue" from filenames
The use of the term "glue" in filenames is a Crypto API-ism that rarely shows up elsewhere in lib/ or arch/*/lib/. I think adopting it there was a mistake. The library just uses standard functions, so the amount of code that could be considered "glue" is quite small. And while often the C functions just wrap the assembly functions, there are also cases like crc32c_arch() in arch/x86/lib/crc32-glue.c that blur the line by in-lining the actual implementation into the C function. That's not "glue code", but rather the actual code. Therefore, let's drop "glue" from the filenames and instead use e.g. crc32.c instead of crc32-glue.c. Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250424002038.179114-7-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'arch/sparc/lib/crc32.c')
-rw-r--r--arch/sparc/lib/crc32.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/sparc/lib/crc32.c b/arch/sparc/lib/crc32.c
new file mode 100644
index 000000000000..428fd5588e93
--- /dev/null
+++ b/arch/sparc/lib/crc32.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* CRC32c (Castagnoli), sparc64 crc32c opcode accelerated
+ *
+ * This is based largely upon arch/x86/crypto/crc32c-intel.c
+ *
+ * Copyright (C) 2008 Intel Corporation
+ * Authors: Austin Zhang <austin_zhang@linux.intel.com>
+ * Kent Liu <kent.liu@intel.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/crc32.h>
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32c_opcode);
+
+u32 crc32_le_arch(u32 crc, const u8 *data, size_t len)
+{
+ return crc32_le_base(crc, data, len);
+}
+EXPORT_SYMBOL(crc32_le_arch);
+
+void crc32c_sparc64(u32 *crcp, const u64 *data, size_t len);
+
+u32 crc32c_arch(u32 crc, const u8 *data, size_t len)
+{
+ size_t n = -(uintptr_t)data & 7;
+
+ if (!static_branch_likely(&have_crc32c_opcode))
+ return crc32c_base(crc, data, len);
+
+ if (n) {
+ /* Data isn't 8-byte aligned. Align it. */
+ n = min(n, len);
+ crc = crc32c_base(crc, data, n);
+ data += n;
+ len -= n;
+ }
+ n = len & ~7U;
+ if (n) {
+ crc32c_sparc64(&crc, (const u64 *)data, n);
+ data += n;
+ len -= n;
+ }
+ if (len)
+ crc = crc32c_base(crc, data, len);
+ return crc;
+}
+EXPORT_SYMBOL(crc32c_arch);
+
+u32 crc32_be_arch(u32 crc, const u8 *data, size_t len)
+{
+ return crc32_be_base(crc, data, len);
+}
+EXPORT_SYMBOL(crc32_be_arch);
+
+static int __init crc32_sparc_init(void)
+{
+ unsigned long cfr;
+
+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+ return 0;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ if (!(cfr & CFR_CRC32C))
+ return 0;
+
+ static_branch_enable(&have_crc32c_opcode);
+ pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
+ return 0;
+}
+arch_initcall(crc32_sparc_init);
+
+static void __exit crc32_sparc_exit(void)
+{
+}
+module_exit(crc32_sparc_exit);
+
+u32 crc32_optimizations(void)
+{
+ if (static_key_enabled(&have_crc32c_opcode))
+ return CRC32C_OPTIMIZATION;
+ return 0;
+}
+EXPORT_SYMBOL(crc32_optimizations);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");