xudc_read32(9)

✨ NAME ✨

okay so bestie, xudc_read32 is a lil function from the Kernel API Manual (section 9, iykyk), and it does exactly one iconic thing: a little endian read from device registers. that's it, that's the vibe 💅

🌸 SYNOPSIS 🌸

unsigned int xudc_read32 (void __iomem *addr );

🎀 ARGUMENTS 🎀

• addr — the addr of the device register. yes, that's the whole assignment: hand it the address, it reads from there ✨

🦋 RETURN 🦋

it returns the value at addr. no extra drama, no side quests, just the value at that address 💖

👑 SEE ALSO 👑

the Kernel file for this whole squad is ./drivers/usb/gadget/udc/udc-xilinx.c, and here's the full friend group — every single one, no cap:

• struct xusb_req(9)
• struct xusb_ep(9)
• struct xusb_udc(9)
• xudc_write32(9)
• xudc_write32_be(9)
• xudc_read32_be(9)
• xudc_wrstatus(9)
• xudc_epconfig(9)
• xudc_start_dma(9)
• xudc_dma_send(9)
• xudc_dma_receive(9)
• xudc_eptxrx(9)
• xudc_done(9)
• xudc_read_fifo(9)
• xudc_write_fifo(9)
• xudc_nuke(9)
• xudc_ep_set_halt(9)
• __xudc_ep_enable(9)
• xudc_ep_enable(9)
• xudc_ep_disable(9)
• xudc_ep_alloc_request(9)
• xudc_free_request(9)
• __xudc_ep0_queue(9)
• xudc_ep0_queue(9)
• xudc_ep_queue(9)
• xudc_ep_dequeue(9)
• xudc_ep0_enable(9)
• xudc_ep0_disable(9)
• xudc_get_frame(9)
• xudc_wakeup(9)
• xudc_pullup(9)
• xudc_eps_init(9)
• xudc_stop_activity(9)
• xudc_start(9)
• xudc_stop(9)
• xudc_clear_stall_all_ep(9)
• xudc_startup_handler(9)
• xudc_ep0_stall(9)
• xudc_setaddress(9)
• xudc_getstatus(9)
• xudc_set_clear_feature(9)
• xudc_handle_setup(9)
• xudc_ep0_out(9)
• xudc_ep0_in(9)
• xudc_ctrl_ep_handler(9)
• xudc_nonctrl_ep_handler(9)
• xudc_irq(9)
• xudc_probe(9)
• xudc_remove(9)

mwah 💖 this lil page comes from ./drivers/usb/gadget/udc, dated October 2026, and it's still living its best life as xudc_read32(9) in the Kernel API Manual. bye bestie, drink water and read your registers responsibly 🫶🌈