forked from KolibriOS/kolibrios
new 68.26 user_unmap(void* block_base, unsigned int offset, size_t unmap_size);
git-svn-id: svn://kolibrios.org@2400 a494cfbc-eb01-0410-851d-a64ba20cac60
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ce623ccaec
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8c4037718d
kernel/trunk/core
@ -848,6 +848,71 @@ proc user_free stdcall, base:dword
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ret
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endp
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align 4
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proc user_unmap stdcall, base:dword, offset:dword, size:dword
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push ebx
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mov ebx, [base] ; must be valid pointer
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test ebx, ebx
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jz .error
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mov edx, [offset] ; check offset
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add edx, ebx ; must be below 2Gb app limit
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js .error
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shr ebx, 12 ; chek block attributes
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lea ebx, [page_tabs+ebx*4]
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mov eax, [ebx-4] ; block attributes
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test al, USED_BLOCK
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jz .error
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test al, DONT_FREE_BLOCK
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jnz .error
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shr edx, 12
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lea edx, [page_tabs+edx*4] ; unmap offset
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mov ecx, [size]
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add ecx, 4095
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shr ecx, 12 ; unmap size in pages
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shr eax, 12 ; block size + 1 page
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lea ebx, [ebx+eax*4-4] ; block end ptr
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lea eax, [edx+ecx*4] ; unmap end ptr
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cmp eax, ebx ; check for overflow
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ja .error
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mov ebx, [offset]
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and ebx, not 4095 ; is it required ?
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.unmap:
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mov eax, [edx] ; get page addres
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test al, 1 ; page mapped ?
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jz @F
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test eax, PG_SHARED ; page shared ?
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jnz @F
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mov [page_tabs+edx*4], dword 2
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; mark page as reserved
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invlpg [ebx] ; when we start using
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call free_page ; empty c-o-w page instead this ?
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@@:
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add ebx, 4096
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add edx, 4
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dec ecx
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jnz .unmap
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pop ebx
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or al, 1 ; return non zero on success
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ret
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.error:
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pop ebx
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xor eax, eax ; something wrong
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ret
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endp
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align 4
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user_normalize:
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; in: esi=heap_base, edi=heap_top
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; out: eax=0 <=> OK
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@ -1307,6 +1307,11 @@ f68:
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@@:
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ret
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.26:
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stdcall user_unmap, ecx, edx, esi
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mov [esp+32], eax
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ret
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.fail:
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xor eax, eax
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mov [esp+32], eax
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@ -1329,8 +1334,9 @@ f68call: ; keep this table closer to main code
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dd f68.21 ; load_driver
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dd f68.22 ; shmem_open
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dd f68.23 ; shmem_close
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dd f68.24
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dd f68.25
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dd f68.24 ; set exception handler
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dd f68.25 ; unmask exception
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dd f68.26 ; user_unmap
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align 4
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