STRUCT CROS_EC_READMEM(9)

✨ struct cros_ec_readmem(9) ✨

okay bestie, so this is a page from the Kernel API Manual and it's literally about struct cros_ec_readmem — the struct you use to read mapped memory 💅 that's the whole vibe, let's get into it 🫶

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🌸 NAME 🌸

struct cros_ec_readmem — the struct used to read mapped memory, no cap 💖

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🦋 SYNOPSIS 🦋

here's the whole thing, exactly as it lives, no edits from me i promise 🙈

struct cros_ec_readmem {
    uint32_t offset;
    uint32_t bytes;
    uint8_t buffer[EC_MEMMAP_SIZE];
 };

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👯 Members 👯

• offset — where you're starting inside the EC_LPC_ADDR_MEMMAP region. that's the spot, that's the coordinate ✨
• bytes — how many bytes you wanna read. zero means "read a string" (including ' ') — yes that's a whole mode, it's giving string energy 😭 and heads up: at most only EC_MEMMAP_SIZE bytes can be read. that's the ceiling, periodt.
• buffer — where the result gets stored. iconic. and the ioctl returns the number of bytes read, or a negative value on error 💀 so like, check your return values bestie.

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🎀 SEE ALSO 🎀

• Kernel file ./include/linux/platform_data/cros_ec_chardev.h — go read it, iykyk 📖

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lowkey a lil reminder: bytes of zero pulls a string (including ' '), and you can't sneak past EC_MEMMAP_SIZE bytes. the struct does not do cardio 🏃‍♀️💨

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and that's the whole page, bestie!! 🌈 this lovely lil doc came to you from ./include/linux/platform_data and it's dated October 2026 — slay, go read some mapped memory, you're the main character now 👑💜