47 lines
1.2 KiB
ArmAsm
47 lines
1.2 KiB
ArmAsm
;; File: pmap.s
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;; Physical Memory Map
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;; Structure: pmap_block
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;;
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;; .next - pointer to next pmap_block struct
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;; .phys_start - start physical address of memory range
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;; .phys_end - stop address of memory range
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;; .bitmap_size - bitmap size (max: 0xFF0)
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;; .last_alloc - last allocated frame in bitmap
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;; .bitmap - bitmap array
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;;
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;; > pmap_block
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;; > 0x0000 +-------------+
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;; > | next |-----> pmap_block
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;; > 0x0004 +-------------+ +----------+
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;; > | phys start | | next |----> NULL (0x0)
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;; > 0x0008 +-------------+ +----------+
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;; > | phys end | | ..... |
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;; > 0x000C +-------------+ | ..... |
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;; > | bitmap size | | ..... |
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;; > 0x000e +-------------+ +----------+
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;; > | last alloc |
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;; > 0x0010 +-------------+
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;; > | bitmap |
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;; > 0x???? +-------------+ (bitmap size * 4)
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;;
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struct pmap_block
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.next: resd 1
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.phys_start: resd 1
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.phys_end: resd 1
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.bitmap_size: resw 1
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.last_alloc: resw 1
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.bitmap:
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endstruc
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section .text
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;; Function: pmap_bootstrap
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;;
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;; (see pmap_bootstrap.png)
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pmap_bootstrap:
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push esp
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mov esp, ebp
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leave
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ret
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