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annotate slides/2018/04/10/memo.txt @ 26:90ac8b16d78b

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author Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Tue, 10 Apr 2018 19:41:09 +0900
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children 922caa454c1a
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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1 # 河野先生
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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2
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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3 現在のsyscall
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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4
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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5 - Usermod
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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6 - SUVmode
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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7 - 移動時にregisterが保存される
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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8 - kernelの処理が終わるとireturn (xv6はtrap return)
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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9 - セーブされたレジスタがおくられる
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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10 - 例えばread commandではfire discryptの値をSUVに遅れば良い
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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11 - processの切り替えさえできれば良い ..-> CPUがHyperThreadingを持っている為,ThreadごとにModeを切り替えれば良さそう
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
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12 - CPUの内部でCPU modeをswitchすれば良いので1clockで出来そう
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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14 - mallockをkernelでやりたい--> mallockをkernel内部に入れ込むとpagengが出来るので良さそう
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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15 - real time monitorは仮想メモリ持っていない -->
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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18 - Lung Protection
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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19 - User空間とKernel空間を分けることでセキュリティ的に担保できる
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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21 - securtyとmemory効率がpagingの導入の手段
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