STRUCT CROSSBAR_DEVICE(9)

💅 struct crossbar_device(9)

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct crossbar_device, and yes it's exactly what it sounds like: the little description struct for a crossbar device. no cap, it's giving "small struct, huge responsibility." 🎀

---

🌸 NAME 🌸

struct crossbar_device — crossbar device description 💖

like… literally the description of a crossbar device. that's the vibe. 🦋

---

✨ SYNOPSIS ✨

struct crossbar_device {
    raw_spinlock_t lock;
    uint int_max;
    uint safe_map;
    uint max_crossbar_sources;
    uint *irq_map;
    void __iomem *crossbar_base;
    int *register_offsets;
    void (*write)(int, int);
 };

look at her. iconic. every field explained below, don't skip a single one 👑🫶

---

🧚 Members 🧚

• lock — a raw_spinlock_t that serializes access to irq_map. it's the bouncer at the club, keeping everybody from grabbing the map at the same time 🔥
• int_max — the maximum number of supported interrupts. the ceiling. the limit. the "you shall not pass" number 💀
• safe_map — a safe default value used to initialize the crossbar. like the factory settings but for irqs, lowkey comforting 🌸
• max_crossbar_sources — the Maximum number of crossbar sources. yes that capital M is in the original, we respect it, plural sources, many of them ⭐
• irq_map — array of interrupts to crossbar number mapping. the whole matchmaking service, fr fr 💖
• crossbar_base — the crossbar base address. the home base, the main character address of the whole thing 🏠
• register_offsets — offsets for each irq number. every irq gets its own lil address offset, personalized, thoughtful, slay ✨
• write — register write function pointer. it's a function pointer, and it writes registers. void (*write)(int, int); — two ints, no return, periodt 🎀

---

🦋 SEE ALSO 🦋

• the Kernel file ./drivers/irqchip/irq-crossbar.c
• crossbar_domain_free(9)

go read them, iykyk 👀💜

---

ngl bestie, the details above are the whole page — every field, every type, every uint, every pointer. no facts were harmed, only decorated 💅

---

and that's a wrap, babe! 🌈 this page lives in ./drivers/irqchip and it's dated October 2026 — so like, future energy only. mwah 💋💖