atc_calc_bytes_left(9)

💅 atc_calc_bytes_left(9) — from the Kernel API Manual, bestie

okay so like, welcome to the glow-up of atc_calc_bytes_left, a kernel function whose whole entire job is math. yes bestie, math. she's calculating the number of bytes left according to the value read from CTRLA, and honestly? iconic behavior. ✨

---

✨ NAME ✨

atc_calc_bytes_left — calculates the number of bytes left according to the value read from CTRLA.

like that's it, that's the whole vibe. she does the byte math so you don't have to 🫶

---

🌸 SYNOPSIS 🌸

u32 atc_calc_bytes_left (u32 current_len , u32 ctrla );

return type is u32, she's giving unsigned 32-bit main character energy 💜

---

🎀 ARGUMENTS 🎀

• current_len — the number of bytes left before reading CTRLA. think of it as the "before" picture 📸
• ctrla — the value of CTRLA. the "after" tea, if you will ☕

two arguments, both u32, no notes. slay.

---

🦋 SEE ALSO 🦋

okay this is the part where you meet her whole friend group. no cap, it's a lot of them, but every single one is here and they all matter 💖

The kernel file she lives in, fr fr: ./drivers/dma/at_hdmac.c

Structs and enums (the squads):

• struct atdma_sg(9)
• struct at_desc(9)
• enum atc_status(9)
• struct at_dma_chan(9)
• struct at_dma(9)
• struct at_dma_platform_data(9)
• struct at_dma_slave(9)

The "is she okay?" checks (platonic, obviously):

• atc_chan_is_enabled(9)
• atc_chan_is_paused(9)
• atc_chan_is_cyclic(9)

The rest of the whole entire cast:

• set_lli_eol(9)
• atc_dostart(9)
• atc_get_llis_residue(9)
• atc_get_residue(9)
• atc_handle_error(9)
• atc_prep_dma_interleaved(9)
• atc_prep_dma_memcpy(9)
• atc_prep_dma_memset(9)
• atc_prep_slave_sg(9)
• atc_prep_dma_cyclic(9)
• atc_tx_status(9)
• atc_alloc_chan_resources(9)
• atc_free_chan_resources(9)
• at_dma_off(9)

bestie pls do not skip these, they're literally the group chat and you will need them 😭

---

🌈 the cute sign-off 🌈

so this little beauty comes from ./drivers/dma and she's dated October 2026 — mark your calendars, she's booked and busy 🎀✨

later bestie, go calculate some bytes 💅🔥