218 lines
5.3 KiB
PHP
218 lines
5.3 KiB
PHP
virtual at 0
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physical_mem_block:
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.start rd 1
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.size rd 1
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.flags rd 1 ;0-free, pid-used.
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.sizeof:
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end virtual
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max_physical_mem_blocks = 24
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uglobal
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num_physical_mem_blocks rd 1
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physical_mem_blocks rd 3*max_physical_mem_blocks
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endg
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Init_Physical_Memory_Manager:
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pushad
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mov edi,physical_mem_blocks
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mov ecx,3*max_physical_mem_blocks
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xor eax,eax
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cld
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rep stosd
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mov dword [num_physical_mem_blocks],2
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mov [physical_mem_blocks+physical_mem_block.start],0x60000
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mov [physical_mem_blocks+physical_mem_block.size],0x20000 ;128Kb
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mov [physical_mem_blocks+physical_mem_block.sizeof+physical_mem_block.start],0x780000
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mov [physical_mem_blocks+physical_mem_block.sizeof+physical_mem_block.size],0x80000 ;512Kb
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popad
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ret
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Insert_Block:
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;input:
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; eax - handle
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;output:
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; none
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push eax ecx esi edi
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sub eax,[num_physical_mem_blocks]
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neg eax
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mov edi,physical_mem_block.sizeof
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imul eax,edi
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shr eax,2
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mov ecx,eax
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mov esi,[num_physical_mem_blocks]
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imul esi,edi
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add esi,physical_mem_blocks
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lea edi,[esi+physical_mem_block.sizeof]
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std
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rep movsd
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pop edi esi ecx eax
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ret
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Delete_Block:
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;input:
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; eax - handle
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;output:
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; none
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pushad
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mov edi,eax
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sub eax,[num_physical_mem_blocks]
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neg eax
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dec eax
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mov esi,physical_mem_block.sizeof
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imul eax,esi
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imul edi,esi
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add edi,physical_mem_blocks
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lea esi,[edi+physical_mem_block.sizeof]
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mov ecx,eax
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shr ecx,2
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cld
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rep movsd
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popad
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ret
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Allocate_Physical_Block:
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;input:
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; eax - size
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;output:
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; eax - address or 0 if not enough memory.
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pushad
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cmp [num_physical_mem_blocks],max_physical_mem_blocks
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jge .error
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mov ebx,eax
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xor eax,eax
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mov esi,physical_mem_blocks
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.loop:
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cmp dword [esi+physical_mem_block.flags],0
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jnz .next
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cmp [esi+physical_mem_block.size],ebx
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jg .addblock
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jz .noaddblock
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.next:
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inc eax
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add esi,physical_mem_block.sizeof
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cmp eax,[num_physical_mem_blocks]
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jl .loop
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.error:
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popad
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xor eax,eax
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ret
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.noaddblock:
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mov eax,[esi+physical_mem_block.start]
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mov [esp+28],eax
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mov eax,[0x3010]
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mov eax,[eax+0x4]
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mov [esi+physical_mem_block.flags],eax
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popad
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ret
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.addblock:
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call Insert_Block
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inc dword [num_physical_mem_blocks]
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mov eax,[esi+physical_mem_block.start]
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mov [esp+28],eax
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mov ecx,[0x3010]
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mov ecx,[ecx+0x4]
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mov [esi+physical_mem_block.flags],ecx
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mov ecx,[esi+physical_mem_block.size]
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mov [esi+physical_mem_block.size],ebx
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sub ecx,ebx
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mov [esi+physical_mem_block.sizeof+physical_mem_block.size],ecx
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add ebx,[esi+physical_mem_block.start]
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mov [esi+physical_mem_block.sizeof+physical_mem_block.start],ebx
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mov dword [esi+physical_mem_block.sizeof+physical_mem_block.flags],0
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popad
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ret
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Free_Physical_Block:
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;input:
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; eax - address
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;output:
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; none
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pushad
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test eax,eax
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jz .ret
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mov ebx,eax
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xor eax,eax
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mov esi,physical_mem_blocks
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.loop:
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cmp ebx,[esi+physical_mem_block.start]
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jz .endloop
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inc eax
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add esi,physical_mem_block.sizeof
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cmp eax,[num_physical_mem_blocks]
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jl .loop
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jmp .ret
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.endloop:
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mov dword [esi+physical_mem_block.flags],0
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test eax,eax
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jz .no_union_previous
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cmp dword [esi-physical_mem_block.sizeof+physical_mem_block.flags],0
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jnz .no_union_previous
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mov ebx,[esi-physical_mem_block.sizeof+physical_mem_block.start]
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add ebx,[esi-physical_mem_block.sizeof+physical_mem_block.size]
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cmp ebx,[esi+physical_mem_block.start]
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jnz .no_union_previous
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mov ebx,[esi+physical_mem_block.size]
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add [esi-physical_mem_block.sizeof+physical_mem_block.size],ebx
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call Delete_Block
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dec eax
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dec [num_physical_mem_blocks]
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.no_union_previous:
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inc eax
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cmp eax,[num_physical_mem_blocks]
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jge .no_union_next
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cmp dword [esi+physical_mem_block.sizeof+physical_mem_block.flags],0
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jnz .no_union_next
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mov ebx,[esi+physical_mem_block.start]
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add ebx,[esi+physical_mem_block.size]
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cmp ebx,[esi+physical_mem_block.sizeof+physical_mem_block.start]
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jnz .no_union_next
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mov ebx,[esi+physical_mem_block.sizeof+physical_mem_block.size]
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add [esi+physical_mem_block.size],ebx
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call Delete_Block
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dec [num_physical_mem_blocks]
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.no_union_next:
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.ret:
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popad
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ret
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sys_allocate_physical_block:
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;eax - subfunction number
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mov eax,ebx
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call Allocate_Physical_Block
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mov [esp+36],eax
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ret
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sys_free_physical_block:
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;eax - subfunction number
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mov eax,ebx
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call Free_Physical_Block
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ret
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sys_set_buffer:
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add ecx,std_application_base_address
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isys_set_buffer: ;for using in kernel
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;eax - subfunction number
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;ebx - physical address
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;ecx - buffer start
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;edx - buffer size
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lea edi,[ebx+second_base_address]
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mov esi,ecx
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mov ecx,edx
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rep movsb
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ret
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sys_get_buffer:
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add ecx,std_application_base_address
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isys_get_buffer: ;for using in kernel
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;eax - subfunction number
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;ebx - physical address
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;ecx - buffer start
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;edx - buffer size
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mov edi,ecx
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lea esi,[ebx+second_base_address]
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mov ecx,edx
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rep movsb
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ret
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sys_internal_services:
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cmp eax,4
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jle sys_sheduler
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cmp eax,5
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jz sys_allocate_physical_block
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cmp eax,6
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jz sys_free_physical_block
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cmp eax,7
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jz sys_set_buffer
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cmp eax,8
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jz sys_get_buffer
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ret |