pdc_pat_io_pci_cfg_write(9)

💖 NAME 💖

okay so this is pdc_pat_io_pci_cfg_write(9), straight out of the Kernel API Manual, and we're gonna get you caught up bestie 🫶

The official one-liner is literally: Retrieve information about memory address ranges.

yes, that's the exact description on the page — we keep the facts exactly as they are, periodt 💅

✨ SYNOPSIS ✨

Here's the signature, copied exactly:

       int pdc_pat_io_pci_cfg_write (unsigned long pci_addr , int pci_size ,
       u32 val );

🎀 ARGUMENTS 🎀

• pci_addr — the PCI configuration space address for which the write request is being made. That's where the write is headed, iykyk.
• pci_size — size of the write in bytes. Valid values are 1, 2, and 4 — literally just those three, no cap.
• val — pointer to the 1, 2, or 4 byte value in the low order end of the argument that's going to be written to PCI Config space. low order end, bestie — keep that detail 🍓

🌈 SEE ALSO 🌈

The page points at the kernel file ./arch/parisc/kernel/firmware.c, and then it name-drops this entire squad of references — all of them, no skipping 💖

• f_extend(9), convert_to_wide(9), set_firmware_width(9)
• pdc_emergency_unlock(9), pdc_add_valid(9), pdc_instr(9)
• pdc_chassis_info(9), pdc_pat_chassis_send_log(9), pdc_chassis_disp(9)
• __pdc_cpu_rendezvous(9), pdc_cpu_rendezvous_lock(9), pdc_cpu_rendezvous_unlock(9)
• pdc_pat_get_PDC_entrypoint(9), pdc_chassis_warn(9), pdc_coproc_cfg(9)
• pdc_iodc_read(9), pdc_system_map_find_mods(9), pdc_system_map_find_addrs(9)
• pdc_model_info(9), pdc_model_sysmodel(9), pdc_model_versions(9)
• pdc_model_cpuid(9), pdc_model_capabilities(9), pdc_model_platform_info(9)
• pdc_cache_info(9), pdc_spaceid_bits(9), pdc_btlb_info(9)
• pdc_mem_map_hpa(9), pdc_lan_station_id(9), pdc_stable_read(9)
• pdc_stable_write(9), pdc_stable_get_size(9), pdc_stable_verify_contents(9)
• pdc_stable_initialize(9), pdc_get_initiator(9), pdc_pci_irt_size(9)
• pdc_pci_irt(9), pdc_pci_config_read(9), pdc_pci_config_write(9)
• pdc_tod_read(9), pdc_pim_toc11(9), pdc_pim_toc20(9)
• pdc_tod_set(9), pdc_iodc_print(9), pdc_iodc_getc(9)
• pdc_pat_cell_get_number(9), pdc_pat_cell_module(9), pdc_pat_cell_info(9)
• pdc_pat_cpu_get_number(9), pdc_pat_get_irt_size(9), pdc_pat_get_irt(9)
• pdc_pat_pd_get_addr_map(9), pdc_pat_pd_get_pdc_revisions(9), pdc_pat_pd_get_platform_counter(9)
• pdc_pat_io_pci_cfg_read(9), pdc_pat_mem_pdt_info(9), pdc_pat_mem_pdt_cell_info(9)
• pdc_pat_mem_read_cell_pdt(9), pdc_pat_mem_read_pd_pdt(9), pdc_pat_mem_get_dimm_phys_location(9)

byeee 💜 source/version is ./arch/parisc/kernel, date is October 2026, and the page is pdc_pat_io_pci_cfg_write(9) — that's the whole footer, bestie 🦋