libnvme(2)

💖 NAME 💖

okay so bestie, this is libnvme(2) from the API Manual, and today's main character is:

enum nvme_pmrcap — this field indicates the persistent memory region capabilities 🫶

that's it. that's the whole vibe. a struct-less little enum fam that tells you what a persistent memory region can actually do. and yes we're gonna go through every single member bc i am NOT about to leave you out here guessing. periodt 💅

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✨ SYNOPSIS ✨

here's the whole thing, exactly as it is, no notes, no edits, iconic behavior only:

enum nvme_pmrcap {
    NVME_PMRCAP_RDS_SHIFT ,
    NVME_PMRCAP_WDS_SHIFT ,
    NVME_PMRCAP_BIR_SHIFT ,
    NVME_PMRCAP_PMRTU_SHIFT ,
    NVME_PMRCAP_PMRWBM_SHIFT ,
    NVME_PMRCAP_PMRTO_SHIFT ,
    NVME_PMRCAP_CMSS_SHIFT ,
    NVME_PMRCAP_PMRWMB_SHIFT ,
    NVME_PMRCAP_RDS_MASK ,
    NVME_PMRCAP_WDS_MASK ,
    NVME_PMRCAP_BIR_MASK ,
    NVME_PMRCAP_PMRTU_MASK ,
    NVME_PMRCAP_PMRWBM_MASK ,
    NVME_PMRCAP_PMRTO_MASK ,
    NVME_PMRCAP_CMSS_MASK ,
    NVME_PMRCAP_PMRWMB_MASK ,
    NVME_PMRCAP_PMRTU_500MS ,
    NVME_PMRCAP_PMRTU_60S

};

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🌸 Constants 🌸

so the pattern here is shift constants and mask constants, and honestly? it's giving bitfield energy and i'm obsessed 👑

• NVME_PMRCAP_RDS_SHIFT — shift amount to get the read data support 🔥
• NVME_PMRCAP_WDS_SHIFT — shift amount to get the write data support 🔥
• NVME_PMRCAP_BIR_SHIFT — shift amount to get the base indicator register 📍
• NVME_PMRCAP_PMRTU_SHIFT — shift amount to get the persistent memory region time units ⏱️
• NVME_PMRCAP_PMRWBM_SHIFT — shift amount to get the persistent memory region write barrier mechanisms 🚧
• NVME_PMRCAP_PMRTO_SHIFT — shift amount to get the persistent memory region timeout ⏳
• NVME_PMRCAP_CMSS_SHIFT — shift amount to get the controller memory space supported 💾
• NVME_PMRCAP_PMRWMB_SHIFT — ⚠️ deprecated shift amount to get the persistent memory region write barrier mechanisms. it's still here, bestie, but it's the old one, don't build your whole personality on it 😭
• NVME_PMRCAP_RDS_MASK — mask to get the read data support 🎭
• NVME_PMRCAP_WDS_MASK — mask to get the write data support 🎭
• NVME_PMRCAP_BIR_MASK — mask to get the base indicator register 📍
• NVME_PMRCAP_PMRTU_MASK — mask to get the persistent memory region time units ⏱️
• NVME_PMRCAP_PMRWBM_MASK — mask to get the persistent memory region write barrier mechanisms 🚧
• NVME_PMRCAP_PMRTO_MASK — mask to get the persistent memory region timeout ⏳
• NVME_PMRCAP_CMSS_MASK — mask to get the controller memory space supported 💾
• NVME_PMRCAP_PMRWMB_MASK — ⚠️ deprecated mask to get the persistent memory region write barrier mechanisms. same deal, its deprecated twin is NVME_PMRCAP_PMRWBM_MASK, use that one 🙈
• NVME_PMRCAP_PMRTU_500MS — 500 milliseconds ⚡
• NVME_PMRCAP_PMRTU_60S — minutes ⏰

ok real talk queen, heads up: the description literally just says minutes for NVME_PMRCAP_PMRTU_60S, and i am not about to go inventing extra lore for it. that's the text. i'm just the messenger 🫡

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and that's the whole page, no crumbs left, every single constant accounted for 💜

this lil cutie came from the enum nvme_pmrcap page in the libnvme(2) API Manual, dated July 2026 🌈✨ mwah, go forth and mask your bits responsibly, ily bye 🎀🦋