STRUCT SCU_REGISTERS(9)

🦋 struct scu_registers(9) — the section 9 kernel API manual page, bestie 🦋

okay so picture this: it's a manual page for struct scu_registers, and it lives in the Kernel API Manual, section 9. That's the whole vibe. Let's get into it 💖

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✨ NAME ✨

struct scu_registers — it's the SCU registers, and guess what, it includes both PEG registers if we turn on that compile option 👀 (conditional slay). And listen — all of these registers live in the memory mapped space returned from BAR1. Every single one. No cap. 💅

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🌸 SYNOPSIS 🌸

struct scu_registers {
    struct scu_peg_registers peg0;
    struct scu_sdma_registers sdma;
    struct scu_completion_ram cram;
    struct scu_frame_buffer_ram fbram;
    u32 reserved_6800_69FF[0x80];
    struct noa_protocol_engine_partition noa_pe;
    struct noa_hub_partition noa_hub;
    struct noa_host_interface_partition noa_if;
    u32 reserved_6d00_7fff[0x4c0];
    struct scu_peg_registers peg1;
    struct scu_afe_registers afe;
    u32 reserved_f000_211fff[0x80c00];
    struct scu_scratch_ram scratch_ram;
};

like look at that struct. it's giving layout. the reserved blocks are literally just holding space so everything lands where it's supposed to — respectful king behavior 🫶

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🎀 Members 🎀

so the Members section is here, it exists, it's official — but there's genuinely nothing written under it in the source page. it's the emptiest section at the function and honestly? iconic for that 🙈 the struct itself in the SYNOPSIS is doing all the talking.

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🔥 SEE ALSO 🔥

• the kernel file itself: ./drivers/scsi/isci/registers.h — that's where the real one lives, go look 👑
• struct scu_viit_entry(9)
• struct scu_iit_entry(9)
• struct smu_registers(9)
• struct scu_sdma_registers(9)
• struct scu_transport_layer_registers(9)
• struct scu_link_layer_registers(9)
• struct scu_sgpio_registers(9)
• struct scu_port_task_scheduler_registers(9)
• struct scu_port_task_scheduler_group_registers(9)
• struct scu_afe_registers(9)
• struct transport_link_layer_pair(9)
• struct scu_peg_registers(9)

that's a whole friend group of register structs fr fr — read them all, they're all linked 💜

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⭐ quick reminder bestie: this is section 9, the kernel API manual, and ./drivers/scsi/isci is the source of record. if you're touching BAR1 memory you already know what you're doing, but like… be careful anyway 🌈

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and that's the page!! source/version is ./drivers/scsi/isci and the date on this cutie is October 2026 — so mark your calendar, struct scu_registers(9) said see you then 💖✨🎀🦋🌸💅🫶