__sgx_alloc_epc_page(9)

🌸 __sgx_alloc_epc_page — like, the kernel API manual, section 9, bestie ✨

okay so real talk: this is a Kernel API Manual page, section 9, and the star of the show is __sgx_alloc_epc_page. it's the little function that grabs you an EPC page, and yes we're gonna walk through it together 🫶

---

✨ NAME ✨

__sgx_alloc_epc_page — allocate an EPC page 💅

---

🎀 SYNOPSIS 🎀

struct sgx_epc_page * __sgx_alloc_epc_page (void );

---

🦋 ARGUMENTS 🦋

• void — no arguments. that's it. zero. nothing. it takes nobody's input, main character energy only 👑

---

💖 DESCRIPTION 💖

so what it actually does: it iterates through NUMA nodes and reserves a free EPC page for the caller. cute, right?

and here's the lil detail that matters — it starts from the NUMA node where the caller is executing 🧚 so it's locality-aware, lowkey thoughtful of it.

---

🔥 RETURN 🔥

• an EPC page — a borrowed EPC page was available, so congrats, you got one ⭐
• NULL — out of EPC pages 😭 that's the sad-path vibe check fail

---

🌈 SEE ALSO 🌈

kernel file: ./arch/x86/kernel/cpu/sgx/main.c

• sgx_mark_page_reclaimable(9)
• sgx_unmark_page_reclaimable(9)
• sgx_alloc_epc_page(9)
• sgx_free_epc_page(9)
• sgx_set_attribute(9)
• sgx_update_svn(9)

---

ngl, if you get NULL back, don't come crying to me — the EPC pages are just gone, bestie 💀

okay and finally, the sign-off 🎀 this one lives in ./arch/x86/kernel/cpu/sgx, and it's dated October 2026. periodt. go read the source, ily, bye 💜