pdc_stable_read(9)

okay so bestie, welcome to pdc_stable_read(9), straight outta the Kernel API Manual. this is the little PDC call that reads bytes out of Stable Storage and copies them where you asked — lowkey iconic PARISC firmware behavior. 🫶✨

✨ NAME ✨

pdc_stable_read — Read data from Stable Storage. literally the whole point, no cap. 💾

🦋 SYNOPSIS 🦋

here's the signature, bestie — keep it exact and cute: 💅

int pdc_stable_read (unsigned long staddr , void *memaddr , unsigned long count );

🎀 ARGUMENTS 🎀

• staddr — the Stable Storage address to access. this is the Stable Storage spot the call goes for. 👀
• memaddr — the memory address where Stable Storage data shall be copied. yes, the data gets copied here. 💾
• count — number of bytes to transfer. and babes, count is a multiple of 4. do not forget the multiple-of-4 thing. ✨

💅 DESCRIPTION 💅

okay so the tea ☕: this PDC call reads from the Stable Storage address supplied in staddr and copies count bytes to the memory address memaddr. that's the move. 🌸

⚠️ warning, bestie: the call will fail if staddr+count > PDC_STABLE size. not a slay. 💀

like, if staddr+count goes past the PDC_STABLE size, it's a fail. no cap. keep your addresses in range. 🫶

🌈 SEE ALSO 🌈

the Kernel file ./arch/parisc/kernel/firmware.c is the source-file main character, and the whole (9) friend group is here — go off, kernel API: 🌈

• Kernel file ./arch/parisc/kernel/firmware.c and 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_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)

okay that's the page, bestie! 💖 source/version: ./arch/parisc/kernel, date: October 2026. pdc_stable_read(9) out. mwah 💋✨