pdc_pci_config_write(9)

💖 NAME 💖

okay so bestie, welcome to pdc_pci_config_write(9) from the Kernel API Manual. The NAME line is serving us this exact energy:

pdc_pci_config_write — read PCI config space.

not me noticing the function is called write and the one-liner says read 😭 but that is literally what the page says, so I am handing it to you untouched. no cap.

✨ SYNOPSIS ✨

void pdc_pci_config_write (void *hpa , unsigned long cfg_addr , unsigned
       int val );

🎀 ARGUMENTS 🎀

• hpa — Token from PDC to indicate which PCI device.
• cfg_addr — Configuration space address to write.
• val — Value we want in the 32-bit register.

🦋 DESCRIPTION 🦋

Write PCI Configuration space before linux PCI subsystem is running.

that is the whole description, bestie. the italic before is doing main character work here — write it before the linux PCI subsystem is running. periodt. ✨

🌸 SEE ALSO 🌸

the Kernel file is ./arch/parisc/kernel/firmware.c, and the whole squad is right here — every single one, no skips:

• 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_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_io_pci_cfg_write(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)

okay that’s the page, bestie 🫶 the cute little source/version corner says ./arch/parisc/kernel, the date is October 2026, and yes, the manual name is still Kernel API Manual 💅✨ go write that config space before linux PCI subsystem is running, slay 🦋🔥