pdc_add_valid(9)

💅 pdc_add_valid(9) — like, the Kernel API Manual edition, bestie 🎀

okay so this is pdc_add_valid from the Kernel API Manual, and honestly? it's a whole vibe check for memory addresses. let's get into it ✨

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🌸 NAME 🌸

pdc_add_valid — verify an address can be accessed without causing a HPMC. no cap, that's the whole gig 🫶

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✨ SYNOPSIS ✨

int pdc_add_valid (unsigned long address );

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🧚 ARGUMENTS 🧚

• address — the address we're verifying. yes, that one. the one you're side-eyeing. 👀

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💖 DESCRIPTION 💖

so this PDC call attempts to read from the specified address and verifies if the address is valid. it's literally just poking the address to see if it's alive. lowkey brave of it ngl 💀

the return value is PDC_OK (0) in case accessing this address is valid. that's the good ending, bestie. 🎀

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🦋 SEE ALSO 🦋

Kernel file ./arch/parisc/kernel/firmware.c, plus this entire friend group:

• f_extend(9)
• convert_to_wide(9)
• set_firmware_width(9)
• pdc_emergency_unlock(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_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)

like, the whole contact list. iykyk 📞💜

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🌈 the cute sign-off 🌈

this lil masterpiece lives in ./arch/parisc/kernel, and it's dated October 2026 — yes, future girlie. 🕰️✨ pdc_add_valid(9), slay and goodbye 💅🦋