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paging.S: explain page table setup

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https://github.com/cirosantilli/x86-bare-metal-examples/issues/12
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Ciro Santilli
2020-05-03 15:14:09 +00:00
parent d2dabadb14
commit cf4f2df43b
1 changed files with 6 additions and 2 deletions
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8
paging.S
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@@ -1,4 +1,4 @@
/* https://github.com/cirosantilli/x86-bare-metal-examples#paging.S */ /* https://github.com/cirosantilli/x86-bare-metal-examples#paging */
#include "common.h" #include "common.h"
@@ -14,7 +14,11 @@ BEGIN
/* Print the canary to make sure it is really there. */ /* Print the canary to make sure it is really there. */
VGA_PRINT_HEX_4 0x1000 VGA_PRINT_HEX_4 0x1000
/* Make page 0 point to 4KiB. */ /* Make page 0 point to page 1 (i.e. address 0 point to address 4KiB)
* by setting bit 12 of the Page Table Entry structure to 1.
* Bit 12 is the lowest bit of the "Address of 4KB page frame" field.
* The directory for that page is set up at SETUP_PAGING_4M.
*/
orb $0x10, page_table + 1 orb $0x10, page_table + 1
PAGING_ON PAGING_ON