memory_map_bottom_up(9)

💅 memory_map_bottom_up(9) — a Kernel API Manual moment 🎀

okay so bestie, buckle up, we're reading a section-9 kernel manpage together and honestly? it's giving architecture. this one lives in the Kernel API Manual and it's about mapping memory from the bottom up, iykyk. 🦋

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✨ NAME ✨

memory_map_bottom_up — Map [map_start, map_end) bottom up. literally that's the whole gig, no cap. 💖

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🌸 SYNOPSIS 🌸

void memory_map_bottom_up (unsigned long map_start , unsigned long map_end );

that's it, that's the signature. two unsigned longs and a dream. ✨

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🎀 ARGUMENTS 🎀

• map_start — start address of the target memory range. where the party begins. 🥳
• map_end — end address of the target memory range. where the party wraps up (remember, it's exclusive, it's a [start, end) situation, periodt). 💅

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💜 DESCRIPTION 💜

so listen. this function sets up direct mapping for the memory range [map_start, map_end) in bottom-up order. the way that it works is honestly kind of iconic.

since we have limited the bottom-up allocation above the kernel, the page tables are going to be allocated just above the kernel, and then we map the memory in [map_start, map_end) bottom-up. that's the whole vibe. the page tables get a spot right above the kernel and everything gets mapped from the bottom, upward, in order. 🌈

no guessing, no extra lore, that's exactly what the page says and I'm not about to invent behaviour for you bestie. 🙈

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🫶 SEE ALSO 🫶

• Kernel file ./arch/x86/mm/init.c
• memory_map_top_down(9) — the other direction, the main character's counterpart 👑

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heads up bestie: this one's a kernel internal, so it's section 9 (kernel API), not your regular command-line manpage. don't go typing it into your shell. 💀

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and that's the whole page, slay. this little gem comes to you from ./arch/x86/mm, dated October 2026 — yes, 2026, we're being so forward-thinking, we love that for us. bye bestie, go map some memory 💖✨🎀🦋🌸