cppc_set_epp(9)

💅 cppc_set_epp — a love letter to the EPP register

okay so we're in the Kernel API Manual today bestie, section 9, and the star of the show is cppc_set_epp. no cap, this one's short and sweet but she DOES things. 🎀

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✨ NAME ✨

cppc_set_epp — literally just writes the EPP register. that's it. that's the whole job. she's not complicated, she's focused. 💅

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🌸 SYNOPSIS 🌸

int cppc_set_epp (int cpu , u64 epp_val );

look at her. two args, one int coming back atcha. iconic. ⭐

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🦋 ARGUMENTS 🦋

• cpu — the CPU you want the register written on. like, which one. you gotta pick one. 🙈
• epp_val — the value going into the EPP register. a u64, so she's got room. 👑

heads up bestie: this page doesn't list an error/return breakdown or any description section beyond "write the EPP register", so we're not gonna invent one. staying in our lane, fr fr. 🫶

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💖 SEE ALSO 💖

the whole cppc cinematic universe, gathered here for your reading pleasure. it's giving family reunion. 🌈

• Kernel file ./drivers/acpi/cppc_acpi.c
• acpi_get_psd_map(9)
• cpc_ffh_supported(9)
• cpc_supported_by_cpu(9)
• pcc_data_alloc(9)
• acpi_cppc_processor_probe(9)
• acpi_cppc_processor_exit(9)
• cpc_read_ffh(9)
• cpc_read_ffh_fb_ctrs(9)
• cpc_write_ffh(9)
• cppc_get_desired_perf(9)
• cppc_get_nominal_perf(9)
• cppc_get_highest_perf(9)
• cppc_get_epp_perf(9)
• cppc_get_perf_caps(9)
• cppc_perf_ctrs_in_pcc_cpu(9)
• cppc_perf_ctrs_in_pcc(9)
• cppc_get_perf_ctrs(9)
• cppc_get_auto_act_window(9)
• cppc_set_auto_act_window(9)
• cppc_get_auto_sel(9)
• cppc_set_auto_sel(9)
• cppc_set_enable(9)
• cppc_get_perf(9)
• cppc_set_perf(9)
• cppc_get_perf_limited(9)
• cppc_set_perf_limited(9)
• cppc_get_transition_latency(9)

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mwah and that's the whole page, bestie. live from ./drivers/acpi, dated October 2026, signed sealed and delivered under the name cppc_set_epp(9). go write some registers responsibly. 💜🦋✨