Paging: Difference between revisions
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== Enabling == |
== Enabling == |
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Enabling paging is actually very simple. All that is needed is to load CR3 with the address of the page directory and to set the paging |
Enabling paging is actually very simple. All that is needed is to load CR3 with the address of the page directory and to set the paging (PG) and protection (PE) bits of CR0. Note: setting the paging flag when the protection flag is clear causes a general-protection exception. |
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<source lang="asm"> |
<source lang="asm"> |
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mov eax, cr0 |
mov eax, cr0 |
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or eax, |
or eax, 0x80000001 |
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mov cr0, eax |
mov cr0, eax |
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</source> |
</source> |
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If you want to set pages as read-only for both userspace and supervisor, replace |
If you want to set pages as read-only for both userspace and supervisor, replace 0x80000001 above with 0x80010001, which also sets the WP bit. |
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To enable PSE (4 MiB pages) the following code is required. |
To enable PSE (4 MiB pages) the following code is required. |
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