100 lines
1.8 KiB
PHP
100 lines
1.8 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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macro KP2V reg {
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add reg, KERNEL_VIRT_BASE
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}
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mm_kmap:
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ret
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;; Function: mm_init
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mm_init:
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mov esi, szMsgMmInit
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call klog
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call pmm_alloc_page
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mov [pKernelPgDir], eax
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; clear page dir
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mov ecx, 4096
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xor al, al
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mov edi, [pKernelPgDir]
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rep stosb
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;; Map kernel and kmemory
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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, [pKernelPgDir]
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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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;; Map free memory
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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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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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