ENUM FASTRPC_MAP_FLAGS(9)

💅 enum fastrpc_map_flags(9)

okay bestie, welcome to the Kernel API Manual ✨ this one's literally all about enum fastrpc_map_flags — the control flags for mapping memory on a DSP user process 🦋 ngl it's short but it ATE, so let's get into it 🎀

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🌸 NAME

enum fastrpc_map_flags — the control flags for mapping memory on a DSP user process 👑 (yes that's the whole name, she's efficient)

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⭐ SYNOPSIS

enum fastrpc_map_flags {
    FASTRPC_MAP_STATIC ,
    FASTRPC_MAP_RESERVED ,
    FASTRPC_MAP_FD ,
    FASTRPC_MAP_FD_DELAYED ,
    FASTRPC_MAP_FD_NOMAP ,
    FASTRPC_MAP_MAX

};

like, that's the whole enum, no cap 💖 six little constants and they ALL matter, so let's meet them 🫶

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🎀 Constants

💜 FASTRPC_MAP_STATIC

Map memory pages with RW- permission and CACHE WRITEBACK ✨ The driver is responsible for cache maintenance when passed the buffer to FastRPC calls 🔥 and bestie, same virtual address will be assigned for subsequent FastRPC calls — she's consistent, we love that 🙈

💜 FASTRPC_MAP_RESERVED

Reserved 💀 that's it, that's the whole description, she's just chillin' on the bench (iykyk — don't touch)

💜 FASTRPC_MAP_FD

Map memory pages with RW- permission and CACHE WRITEBACK 🌈 mapping tagged with a file descriptor. You are responsible for CPU and DSP cache maintenance for the buffer 👀 Get virtual address of buffer on DSP using HAP_mmap_get and HAP_mmap_put APIs 🧚

💜 FASTRPC_MAP_FD_DELAYED

Mapping delayed until user call HAP_mmap and HAP_munmap functions on DSP 😭 it is useful to map a buffer with cache modes other than default modes ⭐ and again, user is responsible for CPU and DSP cache maintenance for the buffer 💅

💜 FASTRPC_MAP_FD_NOMAP

This flag is used to skip CPU mapping 🦋 otherwise behaves similar to FASTRPC_MAP_FD_DELAYED flag — so she's delayed's cousin who just skips the CPU-mapping step, periodt 💖

💜 FASTRPC_MAP_MAX

max count for flags 👑 the ceiling, the limit, the final boss of the enum ✨

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🦋 SEE ALSO

• Kernel file ./include/uapi/misc/fastrpc.h 📁
• FASTRPC_POLL_MODE(9) 🌸

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ok and one little vibe check: FASTRPC_MAP_STATIC, FASTRPC_MAP_FD, FASTRPC_MAP_FD_DELAYED and FASTRPC_MAP_FD_NOMAP all hand the cache-maintenance homework to somebody — sometimes the driver, sometimes you 😭 read carefully before you yeet a buffer at the DSP, fr fr 🙈

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and that's the page bestie, hope it slayed 🫶 this gem came out of ./include/uapi/misc in October 2026 — mwah, go map some memory responsibly 💜🎀✨