STRUCT SDMA_STATE_REGISTERS(9)

✨ struct sdma_state_registers — NAME ✨

okay so bestie, welcome to the Kernel API Manual 💖 this page is literally all about struct sdma_state_registers — the SDMA context for a channel 🎀 that's it, that's the whole vibe. one struct, eleven members, all of them bitfields, she's compact and she knows it 💅

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🦋 SYNOPSIS 🦋

like, here's her whole lewk, no cap, copied exactly:

struct sdma_state_registers {
    u32 pc     :14;
    u32 unused1: 1;
    u32 t      : 1;
    u32 rpc    :14;
    u32 unused0: 1;
    u32 sf     : 1;
    u32 spc    :14;
    u32 unused2: 1;
    u32 df     : 1;
    u32 epc    :14;
    u32 lm     : 2;
 };

lowkey obsessed with how every field is a bitfield with a precise width — 14, 1, 14, 1, 1, 14, 1, 1, 14, 2 — the girl is engineered ✨

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🌸 Members 🌸

time for the member-by-member vibe check, every single one, no skips 🫶

• pc — the program counter. main character energy fr fr 👑
• unused1 — unused. she's just there, taking up space, iconic honestly 💀
• t — the test bit: it's the status of the arithmetic & test instruction ⭐
• rpc — the return program counter. like a little "brb" bookmark 😭
• unused0 — unused. again. we love a placeholder 🎀
• sf — source fault while loading data. not the vibe, but important 🙈
• spc — the loop start program counter 🔁
• unused2 — unused (yes, a third one, she contains multitudes) 🌈
• df — destination fault while storing data. the other fault, keep them straight bestie 💅
• epc — the loop end program counter 🏁
• lm — the loop mode 🌸

ngl the numbering on those unused bits is unused1, unused0, unused2 — that's the order in the struct, and we do not reorder her. copy it exactly, char for char 💖

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🔥 SEE ALSO 🔥

go look at these next, bestie, they're all in the family 🧚

• Kernel file ./drivers/dma/imx-sdma.c
• struct sdma_channel_control(9)
• struct sdma_context_data(9)
• struct sdma_desc(9)
• struct sdma_channel(9)
• struct sdma_firmware_header(9)

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okay that's the whole page, you ate that 💅 mwah 🫶

sign-off szn: this lil number comes from the Kernel API Manual, lives in ./drivers/dma, and is dated October 2026 — and the page itself is struct sdma_state_registers(9). periodt. ✨👑