75 lines
1.3 KiB
ArmAsm
75 lines
1.3 KiB
ArmAsm
[BITS 32]
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%include "base.inc"
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%include "multiboot.inc"
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section .text
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global setup_pmm
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setup_pmm:
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push ebp
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mov ebp, esp
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push edi
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push esi
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push ebx
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mov edi, [ebp + 8]
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mov eax, [edi]
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and eax, 0x40 ; (1 << 6)
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jz .no_mmap
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mov esi, [edi + mb_info.mmap_length]
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mov ebx, [edi + mb_info.mmap_addr]
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.loop:
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mov eax, ebx
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LOG msg_mmap_entry, dword [eax + mb_mmap.addr + 4], \
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dword [eax + mb_mmap.addr], \
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dword [eax + mb_mmap.length + 4], \
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dword [eax + mb_mmap.length], \
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dword [eax + mb_mmap.type]
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mov eax, [ebx + mb_mmap.size]
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add eax, 0x4
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add ebx, eax
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sub esi, eax
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jnz .loop
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jmp .end_mem_detection
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.no_mmap:
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LOG warn_no_mmap
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mov eax, [edi]
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and eax, 0x1
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jz .err
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xor eax, eax
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mov ecx, [edi + mb_info.mem_lower]
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shl ecx, 0xA ; ecx * 1KiB
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LOG msg_mem_block, eax, ecx
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mov eax, 0x100000
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mov ecx, [edi + mb_info.mem_upper]
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shl ecx, 0xA
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LOG msg_mem_block, eax, ecx
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.end_mem_detection:
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xor eax, eax
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jmp .end
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.err:
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mov eax, 1
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.end:
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pop ebx
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pop esi
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pop ebx
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leave
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ret
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section .rodata
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warn_no_mmap db "[WARN] mmap flag not set", 0
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msg_mmap_entry db "Memory Map Entry:", 0xA
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db 0x9, "Address: (hi): %x (lo): %x", 0xA
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db 0x9, "Length: (hi): %x (lo): %x", 0xA
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db 0x9, "Type: %x", 0
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msg_mem_block db "Free Memory:", 0xA
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db 0x9, "Address: %x", 0xA
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db 0x9, "Length: %x", 0
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file db __FILE__, 0
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