nx842_powernv_decompress(9)

💅 nx842_powernv_decompress(9) 💅

okay so you're in the Kernel API Manual, bestie, and this page is literally all about nx842_powernv_decompress — the decompression girly powered by the NX842 coprocessor 🌸

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✨ NAME ✨

nx842_powernv_decompress — decompress data using the 842 algorithm 💖

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🦋 SYNOPSIS 🦋

int nx842_powernv_decompress (const unsigned char *in , unsigned int
       inlen , unsigned char *out , unsigned int *outlenp , void *wmem );

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🎀 ARGUMENTS 🎀

• in — input buffer pointer, aka where the compressed data lives 👀
• inlen — input buffer size, so we know how much input tea there is 🍵
• out — output buffer pointer, the spot where the decompressed result goes ✨
• outlenp — output buffer size pointer, because we gotta track the size situation 💅
• wmem — working memory buffer pointer; its size is determined by nx842_powernv_driver.workmem_size 🧠

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🌈 DESCRIPTION 🌈

Decompression provided by the NX842 coprocessor on IBM PowerNV systems, no cap 🔥 The input buffer is decompressed and the result is stored in the provided output buffer. That's the whole main-character job 💖

Upon return from this function outlen contains the length of the decompressed data. If there is an error then outlen will be 0 and an error will be specified by the return code from this function. So yeah — zero means something went sideways, bestie 😭

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👑 RETURN 👑

see nx842_powernv_exec ⭐

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🫶 SEE ALSO 🫶

• Kernel file ./drivers/crypto/nx/nx-common-powernv.c
• nx842_exec_icswx(9)
• nx842_exec_vas(9)
• nx842_powernv_compress(9)

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signed off with source/version ./drivers/crypto/nx, dated October 2026 — periodt, mwah 💋🎀