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flat assembler > OS Construction > move GDT under VCPI above 1MB

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CandyMan



Joined: 04 Sep 2009
Posts: 286
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
Whether it is possible to copy GDT above the first megabyte in order can switch from the protected mode to the real mode and on the contrary under VCPI?. If this way as it to do it? In raw/xms mode there is no problem.

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Post 01 May 2016, 18:13
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zhak



Joined: 12 Apr 2005
Posts: 489
Location: Belarus
In real mode, addresses in range from 0xFFFF:0x0010 to 0xFFFF:0xFFFF address memory above 1MB if A20 line is enabled. Another option is to enter 'unreal' mode and copy above 1MB using 32-bit addressing
Post 01 May 2016, 21:05
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CandyMan



Joined: 04 Sep 2009
Posts: 286
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
I am thanking for help, with it I already advised myself

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smaller is better
Post 02 May 2016, 11:18
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