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| error in paging page ? https://forum.osdev.org/viewtopic.php?f=8&t=30906 |
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| Author: | stdcall [ Wed Oct 12, 2016 6:38 am ] |
| Post subject: | error in paging page ? |
In http://wiki.osdev.org/Paging#Manipulation I think the following line is wrong here: Code: unsigned long * pt = ((unsigned long *)0xFFC00000) + (0x400 * pdindex); I think it needs to be Code: unsigned long * pt = ((unsigned long *)0xFFC00000) + (0x1000 * pdindex); Am I wrong ? |
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| Author: | Techel [ Wed Oct 12, 2016 6:51 am ] |
| Post subject: | Re: error in paging page ? |
When adding to pointers the offset is multiplied by the pointee's size: Code: int *p = ...
p += 5; //adds 5*sizeof(int) short *p = ... p += 3; //add 3*sizeof(short) |
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| Author: | stdcall [ Wed Oct 12, 2016 7:00 am ] |
| Post subject: | Re: error in paging page ? |
You're right I missed a parenthesis. thought the the casting to unsigned long * was after the multiplication. |
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