for_each_cpuid_0x2_desc(9)

✨ NAME ✨

for_each_cpuid_0x2_desc — iterator for parsed CPUID(0x2) descriptors. This is the Kernel API Manual page for for_each_cpuid_0x2_desc(9), bestie — yes, the manual name is folded in right here. 💖

💅 SYNOPSIS 💅

The call looks like this, no cap:

for_each_cpuid_0x2_desc (_regs , _ptr , _desc );

🎀 ARGUMENTS 🎀

• _regs — CPUID(0x2) register output, as returned by cpuid_leaf_0x2
• _ptr — u8 pointer, for macro internal use only
• _desc — pointer to the parsed CPUID(0x2) descriptor at each iteration

🦋 DESCRIPTION 🦋

Okay so picture this: this iterator loops over the 1-byte descriptors in the CPUID(0x2) output registers you pass in as _regs. For every descriptor, it gives you the parsed info through _desc. Slay. ✨

Need to handle cache-specific descriptors? Switch on _desc->c_type. TLB descriptors? Switch on _desc->t_type. That's the whole routing situation. 💅

Example usage for cache descriptors, literally right here:

            const struct leaf_0x2_table *desc;
            union leaf_0x2_regs regs;
            u8 *ptr;

            cpuid_leaf_0x2(regs);
            for_each_cpuid_0x2_desc(regs, ptr, desc) {
                    switch (desc->c_type) {
                            ...
                    }
            }

🌈 SEE ALSO 🌈

Kernel file ./arch/x86/include/asm/cpuid/api.h is the one to peek at 👀, and the related manual pages are cpuid_leaf_0x2(9), cpuid_subleaf(9), cpuid_leaf(9), cpuid_leaf_raw(9), cpuid_subleaf_n(9), cpuid_subleaf_n_raw(9), and cpuid_subleaf_count(9).

mwah 💋 — this page's source/version is ./arch/x86/include/asm/cpuid, dated October 2026, and it's literally the for_each_cpuid_0x2_desc(9) page. Bye bestie, go switch on those types. 🫶✨