UNION LBC_INT(9)

💅 union lbc_int(9) 💅

okay bestie, we're in the Kernel API Manual today and the star of the show is union lbc_int — the LBC interrupt summary register. it's a union, it's a struct, it's giving "one value, two personalities," and honestly? iconic. 🎀

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📛 NAME 📛

union lbc_int — LBC interrupt summary register

like literally that's the whole name. no notes. 💖

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✨ SYNOPSIS ✨

so here's the vibe. you got a u64 value for when you wanna look at the whole thing at once, and then s, a struct full of one-bit flags for when you wanna be nosy about individual bits. oh and the bit order flips depending on endianness, because of course it does 😭

union lbc_int {
    u64 value;
    struct {
  #if (defined(__BIG_ENDIAN_BITFIELD));
      u64 raz_10_63 : 54;
      u64 cam_hard_err : 1;
      u64 cam_inval_abort : 1;
      u64 over_fetch_err : 1;
      u64 cache_line_to_err : 1;
      u64 sbe : 1;
      u64 dbe : 1;
      u64 pref_dat_len_mismatch_err : 1;
      u64 rd_dat_len_mismatch_err : 1;
      u64 cam_soft_err : 1;
      u64 dma_rd_err : 1;
  #else;
      u64 dma_rd_err : 1;
      u64 cam_soft_err : 1;
      u64 rd_dat_len_mismatch_err : 1;
      u64 pref_dat_len_mismatch_err : 1;
      u64 dbe : 1;
      u64 sbe : 1;
      u64 cache_line_to_err : 1;
      u64 over_fetch_err : 1;
      u64 cam_inval_abort : 1;
      u64 cam_hard_err : 1;
      u64 raz_10_63 : 54;
  #endif;
    } s;
 };

quick tour, no cap:

• u64 value — the whole 64-bit register in one go. main character energy. 👑
• s — the struct that lets you poke at the bits one by one.
• raz_10_63 — 54 bits wide. it's the big one. the rest are all : 1 girlies.
• the one-bit flags are: cam_hard_err, cam_inval_abort, over_fetch_err, cache_line_to_err, sbe, dbe, pref_dat_len_mismatch_err, rd_dat_len_mismatch_err, cam_soft_err, dma_rd_err — all : 1, all present, all accounted for. 🫶
• under #if (defined(__BIG_ENDIAN_BITFIELD)); the bits run from raz_10_63 down to dma_rd_err; under the #else; branch they're declared in exactly the reverse order, dma_rd_err first and raz_10_63 last. same bits, flipped reading order, iykyk. 🔥

and yes, those #if/#else/#endif lines really do have trailing semicolons in this file. we don't ask questions, we just copy it exactly. 💀

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🧚 Members 🧚

this section exists, it's right there in the page, and it lists... nothing. empty. a whole heading with zero content. the audacity. 😭 the members you actually care about are all chilling up there in the struct — go look at the bits, babe. 🦋

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🔗 SEE ALSO 🔗

Kernel file ./drivers/crypto/cavium/nitrox/nitrox_csr.h, plus this whole friend group of unions:

• union ucd_core_eid_ucode_block_num(9)
• union aqm_grp_execmsk_lo(9)
• union aqm_grp_execmsk_hi(9)
• union aqmq_drbl(9)
• union aqmq_qsz(9)
• union aqmq_cmp_thr(9)
• union aqmq_cmp_cnt(9)
• union aqmq_en(9)
• union aqmq_activity_stat(9)
• union emu_fuse_map(9)
• union emu_se_enable(9)
• union emu_ae_enable(9)
• union emu_wd_int_ena_w1s(9)
• union emu_ge_int_ena_w1s(9)
• union nps_pkt_slc_ctl(9)
• union nps_pkt_slc_cnts(9)
• union nps_pkt_slc_int_levels(9)
• union nps_pkt_in_done_cnts(9)
• union nps_pkt_in_instr_ctl(9)
• union nps_pkt_in_instr_rsize(9)
• union nps_pkt_in_instr_baoff_dbell(9)
• union nps_core_int_ena_w1s(9)
• union nps_core_gbl_vfcfg(9)
• union nps_core_int_active(9)
• union efl_core_int(9)
• union efl_core_int_ena_w1s(9)
• union efl_rnm_ctl_status(9)
• union bmi_ctl(9)
• union bmi_int_ena_w1s(9)
• union bmo_ctl2(9)
• union pom_int_ena_w1s(9)
• union lbc_inval_ctl(9)
• union lbc_int_ena_w1s(9)
• union lbc_inval_status(9)
• union rst_boot(9)
• union fus_dat1(9)

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okay that's the whole page, bestie, you ate that. 🍓 this little beauty lives in ./drivers/crypto/cavium/nitrox and the page is dated October 2026 — slay, see you in the future. ✨💜