STRUCT SPU_LSCSA(9)

✨ struct spu_lscsa(9) — the Local Store Context Save Area ✨

okay so bestie, welcome to the Kernel API Manual entry for struct spu_lscsa, aka the Local Store Context Save Area. it's giving "the SPU's little memory scrapbook" and honestly? obsessed. 💖

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🎀 SYNOPSIS 🎀

like, here's the whole vibe, character for character:

struct spu_lscsa {
    struct spu_reg128 gprs[128];
    struct spu_reg128 fpcr;
    struct spu_reg128 decr;
    struct spu_reg128 decr_status;
    struct spu_reg128 ppu_mb;
    struct spu_reg128 ppuint_mb;
    struct spu_reg128 tag_mask;
    struct spu_reg128 event_mask;
    struct spu_reg128 srr0;
    struct spu_reg128 stopped_status;
    unsigned char ls[LS_SIZE];
};

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💅 Members 💅

every single field gets its moment, no gatekeeping:

• gprs — an array of saved registers. yes bestie, all 128 of them, living their best life in there. 👑
• fpcr — the saved floating point status control register. she's controlling, but make it floating point. 🦋
• decr — the saved decrementer value. counting down like a group chat timer fr fr. ⏳
• decr_status — indicates the software decrementer status flags. lowkey just receipts for the decrementer. 🎀
• ppu_mb — saved PPU mailbox data. very "check your messages" energy. 💌
• ppuint_mb — saved PPU interrupting mailbox data. the mailbox that interrupts. rude but iconic. 😭
• tag_mask — saved tag group mask. masking, but the good kind. ✨
• event_mask — saved event mask. same energy, different mask. 🌸
• srr0 — saved SRR0. short name, big main character energy. ⭐
• stopped_status — the conditions to be recreated by restore. it's literally the blueprint for bringing things back, iykyk. 🔥
• ls — saved contents of the Local Storage Area. the whole Local Store, archived and cozy. 💜

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🌈 Description 🌈

so the LSCSA represents state that is primarily saved and restored by SPU-side code. that's the whole thing — no cap, that's it. the SPU side is the one doing the saving and restoring, and this struct is where that state hangs out. 🫶

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🦋 SEE ALSO 🦋

go peek at these when you're done here, bestie:

• Kernel file ./arch/powerpc/include/asm/spu_csa.h
• struct spu_state(9)

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ngl this one's a short read, but every field ate. go read the source file if you want the full lore. 📚

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mwah, that's the whole page! 💋 this lil love letter to struct spu_lscsa(9) comes to you from ./arch/powerpc/include/asm, dated October 2026 — so go forth, save your context, restore your context, and slay. periodt. 🧚‍♀️🌸