218 lines
3.3 KiB
PHP
218 lines
3.3 KiB
PHP
;; File: mm.inc
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;; StupidOS Memory Manager
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;;
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;; About: Memory Layout
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;;
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;; > Virtual
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;; > 0xFFFFFFFF +---------------+
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;; > | |
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;; > | Device Memory |
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;; > | |
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;; > +---------------+
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;; > | |
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;; > | Kernel Heap |
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;; > | |
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;; > KERN_END +---------------+
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;; > | |
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;; > | Stupid Kernel |
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;; > | |
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;; > 0xC0100000 +---------------+
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;; > | I/O Space and |
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;; > | phys memory |
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;; > | Lower than 1M | kernel mode only
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;; > 0xC0000000 +---------------+
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;; > | | user mode
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;; > | userspace |
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;; > | |
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;; > 0x00000000 +---------------+
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;;
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include "pmm.inc"
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include "../sys/mmu.inc"
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;; Macro: KV2P
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;; Convert virtual address to physical
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macro KV2P reg {
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sub reg, KERNEL_VIRT_BASE
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}
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;; Macro: KP2V
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;; Convert physical address to virtual
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macro KP2V reg {
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add reg, KERNEL_VIRT_BASE
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}
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;; Function: mm_kmap
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mm_kmap:
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push esp
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mov ebp, esp
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sub esp, 0x10
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call pmm_alloc_page
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mov [ebp-4], eax
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; clear page dir
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mov edi, eax
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mov ecx, 4096
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xor al, al
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rep stosb
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call pmm_alloc_page
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xor esi, esi
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xor ecx, ecx
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mov edi, eax
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@@:
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mov edx, esi
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or edx, (PTE_P or PTE_W)
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mov [edi], edx
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add edi, 4
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add esi, 4096
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inc ecx
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cmp ecx, 1024
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jb @b
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or eax, (PDE_P or PDE_W)
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mov edx, [ebp-4]
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add edx, (768 * 4)
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KV2P eax
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mov [edx], eax
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mov eax, [ebp-4]
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leave
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ret
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;; Function: mm_clone_pte
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;;
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;; In:
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;; EAX - source page table
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;;
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;; Out:
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;; EAX - cloned page table
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;;
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mm_clone_pte:
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push esp
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mov ebp, esp
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sub esp, 0x10
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leave
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ret
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;; Function: mm_clone_pgdir
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;;
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;; In:
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;; EAX - source page dir
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;;
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;; Out:
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;; EAX - cloned page dir
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mm_clone_pgdir:
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push esp
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mov ebp, esp
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sub esp, 0x10
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mov [ebp-4], eax
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call pmm_alloc_page
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mov [ebp-8], eax
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mov ecx, 4096
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mov edi, eax
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xor al, al
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rep stosb
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xor ecx, ecx
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.loop:
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mov eax, [ebp-4]
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add eax, ecx
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mov eax, [eax]
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cmp eax, 0
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je .next
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cmp ecx, (768*4)
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jb @f
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mov edx, [ebp-8]
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add edx, ecx
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mov [edx], eax
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jmp .next
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@@:
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mov edx, eax
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call pmm_alloc_page
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.next:
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add ecx, 4
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cmp ecx, 4096
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jb .loop
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leave
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ret
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;; Function: mm_init
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;; Initialize the memory manager
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mm_init:
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mov esi, szMsgMmInit
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call klog
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call mm_kmap
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mov [pKernelPgDir], eax
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; map whole memory
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mov esi, 0x400000
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mov ebx, (769 * 4)
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.loop:
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call pmm_alloc_page
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xor ecx, ecx
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mov edi, eax
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@@:
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mov edx, esi
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or edx, (PTE_P or PTE_W)
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mov [edi], edx
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add edi, 4
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add esi, 4096
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inc ecx
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cmp ecx, 1024
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jb @b
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or eax, (PDE_P or PDE_W)
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mov edx, [pKernelPgDir]
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add edx, ebx
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add ebx, 4
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KV2P eax
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mov [edx], eax
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cmp esi, [stBootInfo.high_mem]
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jb .loop
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; reload cr3
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mov eax, [pKernelPgDir]
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KV2P eax
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mov cr3, eax
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push eax
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mov esi, szMsgMmKernelPgDir
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call klog
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ret
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;; Function: mm_mmap
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;;
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;; In:
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;; XXX - addr
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;; XXX - length
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;; XXX - prot
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;; XXX - flags
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mm_mmap:
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ret
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;; Function: mm_munmap
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;;
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;; In:
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;; XXX - addr
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;; XXX - length
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;;
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mm_munmap:
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ret
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mm_wallk_pagedir:
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ret
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szMsgMmInit db "MM: initialize", 0
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szMsgMmKernelPgDir db "MM: Kernel page dir at %x phys", 0
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pKernelPgDir dd 0
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