1 files changed, 66 insertions, 0 deletions
diff --git a/src/crypto/zinc/chacha20/chacha20-ppc-glue.c b/src/crypto/zinc/chacha20/chacha20-ppc-glue.c
new file mode 100644
index 0000000..ebcc26f
--- /dev/null
+++ b/src/crypto/zinc/chacha20/chacha20-ppc-glue.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (C) 2019 Shawn Landden <shawn@git.icu>. All Rights Reserved.
+ */
+
+asmlinkage void ChaCha20_ctr32_int(u8 *out, const u8 *inp,
+				   size_t len, const u32 key[8],
+				   const u32 counter[4]);
+asmlinkage void ChaCha20_ctr32_vmx(u8 *out, const u8 *inp,
+				   size_t len, const u32 key[8],
+				   const u32 counter[4]);
+asmlinkage void ChaCha20_ctr32_vsx(u8 *out, const u8 *inp,
+				   size_t len, const u32 key[8],
+				   const u32 counter[4]);
+static bool *const chacha20_nobs[] __initconst = { };
+static void __init chacha20_fpu_init(void) {}
+
+static inline bool chacha20_arch(struct chacha20_ctx *ctx, u8 *dst,
+				 const u8 *src, size_t len,
+				 simd_context_t *simd_context)
+{
+	void (*ChaCha20SIMD)(u8 *out, const u8 *inp,
+			     size_t len, const u32 key[8],
+			     const u32 counter[4]);
+
+	/* SIMD disables preemption, so relax after processing each page. */
+	BUILD_BUG_ON(PAGE_SIZE < CHACHA20_BLOCK_SIZE ||
+		     PAGE_SIZE % CHACHA20_BLOCK_SIZE);
+
+	if (cpu_has_feature(CPU_FTR_VSX_COMP))
+		ChaCha20SIMD = &ChaCha20_ctr32_vsx;
+	else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
+                ChaCha20SIMD = &ChaCha20_ctr32_vmx;
+	else {
+		ChaCha20_ctr32_int(dst, src, len, ctx->key, ctx->counter);
+		return true;
+	}
+
+	for (;;) {
+		if (len >= CHACHA20_BLOCK_SIZE * 3 && simd_use(simd_context)) {
+			const size_t bytes = min_t(size_t, len, PAGE_SIZE);
+
+			ChaCha20SIMD(dst, src, bytes, ctx->key, ctx->counter);
+			ctx->counter[0] += (bytes + 63) / 64;
+			len -= bytes;
+			if (!len)
+				break;
+			dst += bytes;
+			src += bytes;
+			simd_relax(simd_context);
+		} else {
+			ChaCha20_ctr32_int(dst, src, len, ctx->key, ctx->counter);
+			ctx->counter[0] += (len + 63) / 64;
+			return true;
+		}
+	}
+	return true;
+}
+
+static inline bool hchacha20_arch(u32 derived_key[CHACHA20_KEY_WORDS],
+				  const u8 nonce[HCHACHA20_NONCE_SIZE],
+				  const u8 key[HCHACHA20_KEY_SIZE],
+				  simd_context_t *simd_context)
+{
+	return false;
+}