STRUCT MSGDMA_EXTENDED_DESC(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, we're opening the Kernel API Manual page for struct msgdma_extended_desc(9) — it's giving extended descriptor, it's giving kernel API, and we're gonna understand it fr fr. 💅✨

💖 NAME 💖

struct msgdma_extended_desc — implements an extended descriptor. periodt. 💫

✨ SYNOPSIS ✨

Here's the struct, exactly as it is, no cap:

struct msgdma_extended_desc {
    u32 read_addr_lo;
    u32 write_addr_lo;
    u32 len;
    u32 burst_seq_num;
    u32 stride;
    u32 read_addr_hi;
    u32 write_addr_hi;
    u32 control;
};

🌸 Members 🌸

  • read_addr_lo — data buffer source address low bits.
  • write_addr_lo — data buffer destination address low bits.
  • len — the number of bytes to transfer per descriptor.
  • burst_seq_num — bit 31:24 write burst, bit 23:16 read burst, bit 15:00 sequence number. 🎀
  • stride — bit 31:16 write stride, bit 15:00 read stride.
  • read_addr_hi — data buffer source address high bits.
  • write_addr_hi — data buffer destination address high bits.
  • control — characteristics of the transfer. 💅

🔥 SEE ALSO 🔥

the kernel file ./drivers/dma/altera-msgdma.c is in the chat, and the whole friend group is:

and that's the page, bestie! cute little sign-off for the footer info: source/version <pink>./drivers/dma</pink> and date October 2026, with the page being struct msgdma_extended_desc(9)`. mwah 💋🫶✨

📦 where this page comes from