tw68_risc_buffer(9)

💅 tw68_risc_buffer(9) 💅

okay so bestie, welcome to the Kernel API Manual — yes, this whole page lives in tw68_risc_buffer(9) and we are gonna get through it together, i promise 🫶

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✨ NAME ✨

tw68_risc_buffer — and honestly? the original page just leaves it at that. no description. nothing. a mystery. main character energy, truly, she said "figure it out" and dipped 💀

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✨ SYNOPSIS ✨

int tw68_risc_buffer (struct pci_dev *pci , struct tw68_buf *buf ,
struct scatterlist *sglist , unsigned int top_offset , unsigned int
bottom_offset , unsigned int bpl , unsigned int padding , unsigned int
lines );

that's the whole vibe right there — one int, and a whooooole lot of arguments. we're gonna go through every single one, don't worry 💖

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✨ ARGUMENTS ✨

• pci — the struct pci_dev *, aka the structure holding all the info about the pci slot our device is chilling in. her little home address 🏠
• buf — a struct tw68_buf *, and this one carries the info about the memory used for our controller program. the ~paperwork~ basically 📋
• sglist — the scatter-gather list entry. yes bestie, that's the whole description. iconic brevity ✨
• top_offset — the offset within the risc program area for the first odd frame line. odd lines first, she's quirky like that 🎀
• bottom_offset — the offset within the risc program area for the first even frame line. the bottom half of this whole top/bottom situation 🌸
• bpl — number of data bytes per scan line. bytes per line, hence the name, iykyk 💅
• padding — number of extra bytes to add at the end of each line. little sprinkle of extra on top 🍓
• lines — number of scan lines. the count. the amount. periodt 🦋

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✨ DESCRIPTION ✨

so this routine gets called by tw68-video, okay?

first thing it does: it allocates memory for the dma controller "program" 👑

and then — the fun part — it fills that memory in with the appropriate "instructions" ✨🔥

like, that's literally it, that's the whole job. allocate, then fill. she's efficient, we stan 😭

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✨ SEE ALSO ✨

• the kernel file ./drivers/media/pci/tw68/tw68-risc.c
• tw68_risc_field(9)

go read those too, bestie, don't leave them hanging 🫶

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and that's the page!! mwah 💋 this whole thing comes to you from ./drivers/media/pci/tw68, dated October 2026 — so like, mark your calendar bestie, that's the source, the version, and the date all in one cute little bow 🎀 byeeee 💜