STRUCT AP_QUEUE_STATUS(9)

💖 struct ap_queue_status(9) 💖

okay bestie, welcome to the Kernel API Manual page for struct ap_queue_status — yes, the whole page is literally about one status word, and she is iconic. no cap, this is the AP queue status vibe check. 💅

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✨ NAME ✨

struct ap_queue_status — holds the AP queue status. 🫶

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🧚 SYNOPSIS 🧚

okay so here's the whole struct, bestie — every colon, brace and anonymous little guy stays exactly where it was:

struct ap_queue_status {
    union {
      unsigned int value                      : 32;
      struct {
        unsigned int status_bits        : 8;
        unsigned int rc                 : 8;
        unsigned int                    : 16;
      };
      struct {
        unsigned int queue_empty        : 1;
        unsigned int replies_waiting    : 1;
        unsigned int queue_full         : 1;
        unsigned int                    : 3;
        unsigned int async              : 1;
        unsigned int irq_enabled        : 1;
        unsigned int response_code      : 8;
        unsigned int                    : 16;
      };
    };
 };

that's the whole shape. periodt. 🎀

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💅 Members 💅

the Members section is giving very specific, so here's every entry with its exact label:

• {unnamed_union} — anonymous 👻
• {unnamed_struct} — anonymous 👻
• {unnamed_struct} — anonymous 👻
• queue_empty — shows if queue is empty 🫧
• replies_waiting — waiting replies ⏳
• queue_full — is 1 if the queue is full 😤
• irq_enabled — shows if interrupts are enabled for the AP ⚡
• response_code — holds the 8 bit response code 🔢

not me listing anonymous members but go off. 💀

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🌈 Description 🌈

the AP queue status word is returned by all three AP functions: PQAP, NQAP and DQAP. literally all three, bestie — it's giving group-chat energy. there's a set of flags in the first byte, followed by a 1 byte response code. 💖

for convenience, the value field is a 32 bit access of the whole status. meanwhile the status_bits and rc fields comprise the leftmost 8 status bits and the response_code. yes, it's a little bit-packing moment. ✨

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🔥 SEE ALSO 🔥

okay so the kernel file is here, and the whole see-also friend group is:

• Kernel file ./arch/s390/include/asm/ap.h
• ap_instructions_available(9)
• ap_tapq(9)
• ap_test_queue(9)
• struct ap_config_info(9)
• ap_qci(9)
• ap_aqic(9)
• ap_qact(9)
• ap_nqap(9)
• ap_dqap(9)

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mwah 💋 — source/version: ./arch/s390/include/asm; date: October 2026; page: struct ap_queue_status(9). that's the whole footer, folded into a lil sign-off. 🎀