STRUCT CCP_PASSTHRU_NOMAP_ENGINE(9)

💅 NAME 💅

struct ccp_passthru_nomap_engine — bestie, this is the CCP pass-through operation that does its thing without performing DMA mapping ✨

(also hey, this is section 9 of the Kernel API Manual, in case you were wondering where you wandered into 🎀)

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🦋 SYNOPSIS 🦋

struct ccp_passthru_nomap_engine {
    enum ccp_passthru_bitwise bit_mod;
    enum ccp_passthru_byteswap byte_swap;
    dma_addr_t mask;
    u32 mask_len;
    dma_addr_t src_dma, dst_dma;
    u64 src_len;
    u32 final;
 };

Like, that's the whole vibe right there 👑 no cap.

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🌸 Members 🌸

• bit_mod — the bitwise operation you're gonna perform, periodt
• byte_swap — the byteswap operation you're gonna perform, also periodt
• mask — the mask to be applied to the data 🎀
• mask_len — length in bytes of mask
• src_len — length in bytes of the data used for this operation
• final — indicate final pass-through operation 🏁

lowkey notice how src_dma and dst_dma are chillin' in the struct but not described up here? yeah. not me pointing that out. anyway 💀

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✨ Description ✨

Okay so these are the variables you literally must have set when you call ccp_enqueue_cmd — no skipping, bestie, it's giving non-negotiable:

• bit_mod, byte_swap, src, dst, src_len
• mask, mask_len — but only if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP 👀

🫶 highkey important: that second bullet is conditional. if bit_mod is CCP_PASSTHRU_BITWISE_NOOP, you don't need the mask stuff. iykyk.

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🔥 SEE ALSO 🔥

Kernel file ./include/linux/ccp.h — and honestly the whole friend group:

ccp_present(9), ccp_version(9), ccp_enqueue_cmd(9), struct ccp_aes_engine(9), struct ccp_xts_aes_engine(9), struct ccp_sha_engine(9), struct ccp_des3_engine(9), struct ccp_rsa_engine(9), struct ccp_passthru_engine(9), struct ccp_ecc_modular_math(9), struct ccp_ecc_point(9), struct ccp_ecc_point_math(9), struct ccp_ecc_engine(9), struct ccp_cmd(9)

like, go read them, they're all iconic 💜

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okay bye bestie 🧚✨ this lil page came from ./include/linux, stamped October 2026, and it lives in section 9 of the Kernel API Manual as struct ccp_p...nomap_engine(9) — slay, go map some DMA (except, y'know, not in this one 🙈) 🍓💖