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36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
#pragma once
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/// \file kernel_memory.h
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/// Constants related to the kernel's memory layout
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#include <stddef.h>
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#include <stdint.h>
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namespace memory {
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/// Size of a single page frame.
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static const size_t frame_size = 0x1000;
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/// Start of kernel memory.
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static const uintptr_t kernel_offset = 0xffffff0000000000;
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/// Offset from physical where page tables are mapped.
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static const uintptr_t page_offset = 0xffffff8000000000;
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/// Initial process thread's stack address
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static const uintptr_t initial_stack = 0x0000800000000000;
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/// Initial process thread's stack size, in pages
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static const unsigned initial_stack_pages = 1;
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/// Max size of the kernel heap
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static const size_t kernel_max_heap = 0x800000000; // 32GiB
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/// Start of the kernel heap
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static const uintptr_t heap_start = page_offset - kernel_max_heap;
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/// Helper to determine if a physical address can be accessed
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/// through the page_offset area.
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inline bool page_mappable(uintptr_t a) { return (a & page_offset) == 0; }
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} // namespace memory
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