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Merge remote-tracking branch 'Kernel/master'

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EnderIce2
2024-11-20 05:00:33 +02:00
parent 93d408e0af 19f2a78d35
commit 682c84b2af
468 changed files with 112800 additions and 1 deletions
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62
Kernel/arch/amd64/bootstrap/multiboot/Paging/mb_pt.s Normal file
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/*
This file is part of Fennix Kernel.
Fennix Kernel is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
Fennix Kernel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
PAGE_TABLE_SIZE = 0x4
.code32
.section .bootstrap.data, "a"
.align 0x1000
.global BootPageTable
BootPageTable:
.space 0x10000 /* 0x4000 bytes will be used in UpdatePageTable */
.section .bootstrap.text, "a"
.global UpdatePageTable
UpdatePageTable:
mov $(BootPageTable + 0x0000), %edi /* First PML4E */
mov $(BootPageTable + 0x1000), %eax /* First PDPTE */
or $0x3, %eax /* Bitwise OR on eax (PDPTE) with 11b (Present, Write) */
mov %eax, (%edi) /* Write 11b to PML4E */
mov $(BootPageTable + 0x1000), %edi /* First PDPTE */
mov $(BootPageTable + 0x2000), %eax /* First PDE */
or $0x3, %eax /* Bitwise OR on eax (PDE) with 11b (Present, Write) */
mov $PAGE_TABLE_SIZE, %ecx /* For loop instruction */
mov $0x0, %ebx /* Value to store in the next 4 bytes */
.FillPageTableLevel3:
mov %eax, (%edi) /* Store modified PDE in PDPTE */
mov %ebx, 0x4(%edi) /* Store the ebx value in the next 4 bytes */
add $0x1000, %eax /* Increment (page size) */
adc $0x0, %ebx /* Add 0 to carry flag */
add $0x8, %edi /* Add 8 to edi (next PDE) */
loop .FillPageTableLevel3 /* Loop until ecx is 0 */
mov $(BootPageTable + 0x2000), %edi /* First PDE */
mov $0x83, %eax /* Present, Write, Large Page */
mov $(512 * PAGE_TABLE_SIZE), %ecx /* For loop instruction */
mov $0x0, %ebx /* Value to store in the next 4 bytes */
.FillPageTableLevel2:
mov %eax, (%edi) /* Store modified PDE in PDPTE */
mov %ebx, 0x4(%edi) /* Store the ebx value in the next 4 bytes */
add $0x200000, %eax /* Increment (page size) */
adc $0x0, %ebx /* Add 0 (carry flag) to ebx to increment if there was a carry */
add $0x8, %edi /* Add 8 to edi (next PDE) */
loop .FillPageTableLevel2 /* Loop until ecx is 0 */
ret