STRUCT PS3_LPM_SHADOW_REGS(9)

✨ struct ps3_lpm_shadow_regs — Performance monitor shadow registers ✨

okay bestie, welcome to the Kernel API Manual 💖 this one's a little struct in the PS3 performance-monitor corner of the kernel, and honestly? it's giving "quiet little cache that does the work nobody claps for." let's get into it 🎀

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🌸 SYNOPSIS 🌸

struct ps3_lpm_shadow_regs {
    u64 pm_control;
    u64 pm_start_stop;
    u64 group_control;
    u64 debug_bus_control;
 };

like, four u64s. four. that's the whole vibe. she's simple and I respect it 💅

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🦋 Members 🦋

• pm_control — the shadow of the processor's pm_control register. yes, "shadow of" — she's a copy, not the original, iykyk 🫶
• pm_start_stop — the shadow of the processor's pm_start_stop register.
• group_control — the shadow of the processor's group_control register.
• debug_bus_control — the shadow of the processor's debug_bus_control register.

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🧚 Description 🧚

so here's the tea ☕: the logical performance monitor gives you a write-only interface to these processor registers. write-only. you can write but you literally cannot read back, which is kind of a main character move but also deeply unhelpful if you're nosy.

that's where these shadow variables come in — they cache the processor register values so you can actually read them. iconic behaviour honestly 🔥 saving us all from the "wrote it and prayed" lifestyle.

and when the shadow registers are first created at lpm creation, their initial value is PS3_LPM_SHADOW_REG_INIT. no cap, that's the starting point ⭐

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👑 SEE ALSO 👑

kernel file ./drivers/ps3/ps3-lpm.c plus this whole friend group:

• struct ps3_lpm_priv(9)
• ps3_read_phys_ctr(9)
• ps3_write_phys_ctr(9)
• ps3_read_ctr(9)
• ps3_write_ctr(9)
• ps3_read_pm07_control(9)
• ps3_write_pm07_control(9)
• ps3_read_pm(9)
• ps3_write_pm(9)
• ps3_get_ctr_size(9)
• ps3_set_ctr_size(9)
• ps3_enable_pm(9)
• ps3_disable_pm(9)
• ps3_lpm_copy_tb(9)
• ps3_lpm_copy_tb_to_user(9)
• ps3_get_and_clear_pm_interrupts(9)
• ps3_enable_pm_interrupts(9)
• ps3_lpm_open(9)
• ps3_lpm_close(9)

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🏁 and that's the page, bestie! brought to you by ./drivers/ps3, dated October 2026, all about our girl struct ps3_lpm_shadow_regs(9). go read a register for me 💜✨