ocxl_global_mmio_read64(9)

💅 ocxl_global_mmio_read64(9) — from the Kernel API Manual, bestie ✨

okay so picture this: you're deep in kernel land, the ocxl docs are open, and you just need one (1) lil 64-bit number out of global MMIO. that's this function. she's the read64 girlie of the family and she's literally here to help 🫶

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🌸 NAME 🌸

ocxl_global_mmio_read64 — grab a 64-bit value from global MMIO. yes, sixty-four whole bits, no cap 💖

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✨ SYNOPSIS ✨

int ocxl_global_mmio_read64 (struct ocxl_afu *afu , size_t offset , enum
ocxl_endian endian , u64 *val );

she returns an int, takes four args, and she's not complicated. iykyk 💅

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🎀 ARGUMENTS 🎀

• afu — the AFU. like, the whole accelerator function unit you're doing all this for 👑
• offset — the offset from the start of MMIO. measure from the beginning, bestie, not from wherever you feel like 🙈
• endian — the endianness that the MMIO data is in. gotta tell her which way the bytes are facing fr fr
• val — returns the value. she fills your pointer in with the good stuff ⭐

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🦋 DESCRIPTION 🦋

Returns 0 for success, negative on error. that's the whole vibe check — zero means slay, anything negative means something went sideways and you should probably go look at it 😭

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🌈 SEE ALSO 🌈

okay the whole friend group is here, and you should lowkey know all of them:

• the kernel file ./include/misc/ocxl.h 📁
• ocxl_function_open(9)
• ocxl_function_afu_list(9)
• ocxl_function_fetch_afu(9)
• ocxl_afu_get(9)
• ocxl_afu_put(9)
• ocxl_function_config(9)
• ocxl_function_close(9)
• ocxl_context_alloc(9)
• ocxl_context_free(9)
• ocxl_context_attach(9)
• ocxl_context_detach(9)
• ocxl_afu_irq_alloc(9)
• ocxl_afu_irq_free(9)
• ocxl_afu_irq_get_addr(9)
• ocxl_irq_set_handler(9)
• ocxl_afu_config(9)
• ocxl_afu_set_private(9)
• ocxl_afu_get_private(9)
• ocxl_global_mmio_read32(9)
• ocxl_global_mmio_write32(9)
• ocxl_global_mmio_write64(9)
• ocxl_global_mmio_set32(9)
• ocxl_global_mmio_set64(9)
• ocxl_global_mmio_clear32(9)
• ocxl_global_mmio_clear64(9)

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ngl the read32 / write32 / write64 / set / clear siblings are all right there in that list — if you forget one, it's giving "did not read the whole friend group chat" 💀

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and that's the page!! mwah 💋 this one came out of ./include/misc in October 2026 — xoxo, go read your 64 bits responsibly 🧚‍♀️💜