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Kernel: Expand the kernel memory slot from 8 MiB to 16 MiB

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We were only 448 KiB away from filling up the old slot size we reserve
for the kernel above the 3 GiB mark. This expands the slot to 16 MiB,
which allows us to continue booting the kernel until somebody takes
the time to improve our loader.
This commit is contained in:
Andreas Kling 2021-02-23 21:50:18 +01:00
parent 4ba36c6a49
commit 8cd5477e54
Notes: sideshowbarker 2024-07-18 21:58:37 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/8cd5477e54a
2 changed files with 11 additions and 7 deletions
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16
Kernel/Arch/i386/Boot/boot.S
View File

@ -51,7 +51,7 @@ boot_pd0_pt0:
.skip 4096 * 4
.global boot_pd3_pts
boot_pd3_pts:
.skip 4096 * 4
.skip 4096 * 8
.global boot_pd3_pt1023
boot_pd3_pt1023:
.skip 4096
@ -87,7 +87,11 @@ boot_pd3 : 512 pde's
1: boot_pd3_pts[1] (3074-3076MB) (pseudo 512 4KB pages)
2: boot_pd3_pts[2] (3076-3078MB) (pseudo 512 4KB pages)
3: boot_pd3_pts[3] (3078-3080MB) (pseudo 512 4KB pages)
4: boot_pd3_pt1023 (4094-4096MB) (for page table mappings)
4: boot_pd3_pts[4] (3082-3084MB) (pseudo 512 4KB pages)
5: boot_pd3_pts[5] (3084-3086MB) (pseudo 512 4KB pages)
6: boot_pd3_pts[6] (3086-3088MB) (pseudo 512 4KB pages)
7: boot_pd3_pts[7] (3088-3090MB) (pseudo 512 4KB pages)
8: boot_pd3_pt1023 (4094-4096MB) (for page table mappings)
the 9 page tables each contain 512 pte's that map individual 4KB pages
@ -141,7 +145,7 @@ start:
/* clear pd3's pt's */
movl $(boot_pd3_pts - 0xc0000000), %edi
movl $(1024 * 5), %ecx
movl $(1024 * 9), %ecx
xorl %eax, %eax
rep stosl
@ -153,7 +157,7 @@ start:
orl $0x3, 0(%edi)
/* add boot_pd3_pts to boot_pd3 */
movl $4, %ecx
movl $8, %ecx
movl $(boot_pd3 - 0xc0000000), %edi
movl $(boot_pd3_pts - 0xc0000000), %eax
@ -178,8 +182,8 @@ start:
addl $4096, %eax
loop 1b
/* pseudo identity map the 3072-3080MB range */
movl $(512 * 4), %ecx
/* pseudo identity map the 3072-3090MB range */
movl $(512 * 8), %ecx
movl $(boot_pd3_pts - 0xc0000000), %edi
xorl %eax, %eax

2
Kernel/VM/PageDirectory.cpp
View File

@ -56,7 +56,7 @@ extern "C" PageDirectoryEntry boot_pd3[1024];
UNMAP_AFTER_INIT PageDirectory::PageDirectory()
{
m_range_allocator.initialize_with_range(VirtualAddress(0xc0800000), 0x3f000000);
m_range_allocator.initialize_with_range(VirtualAddress(0xc1000000), 0x30800000);
m_identity_range_allocator.initialize_with_range(VirtualAddress(FlatPtr(0x00000000)), 0x00200000);
// Adopt the page tables already set up by boot.S