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remove "global bit" from the root page tables

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- fix wrong usage of the "global bit"
- every process has its own pml4 => no global view to the self references
This commit is contained in:
Stefan Lankes 2015-07-08 16:33:08 +02:00
parent 51927e7e6d
commit 4c2244680d
1 changed files with 7 additions and 7 deletions
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14
hermit/arch/x86/kernel/entry.asm
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@ -313,7 +313,7 @@ Lno_remap:
; Set CR0
mov eax, cr0
and eax, ~(1 << 30) ; enable caching
and eax, ~(1 << 16) ; allow kernel write access to read-only pages
and eax, ~(1 << 16) ; allow kernel write access to read-only pages
or eax, (1 << 31) ; enable paging
or eax, (1 << 0) ; long mode also needs PM-bit set
mov cr0, eax
@ -671,17 +671,17 @@ boot_stack:
; Bootstrap page tables are used during the initialization.
ALIGN 4096
boot_pml4:
DQ boot_pdpt + 0x107 ; PG_PRESENT | PG_GLOBAL | PG_RW | PG_USER
DQ boot_pdpt + 0x7 ; PG_PRESENT | PG_RW | PG_USER
times 510 DQ 0 ; PAGE_MAP_ENTRIES - 2
DQ boot_pml4 + 0x303 ; PG_PRESENT | PG_GLOBAL | PG_RW | PG_SELF (self-reference)
DQ boot_pml4 + 0x203 ; PG_PRESENT | PG_RW | PG_SELF (self-reference)
boot_pdpt:
DQ boot_pgd + 0x107 ; PG_PRESENT | PG_GLOBAL | PG_RW | PG_USER
DQ boot_pgd + 0x7 ; PG_PRESENT | PG_RW | PG_USER
times 510 DQ 0 ; PAGE_MAP_ENTRIES - 2
DQ boot_pml4 + 0x303 ; PG_PRESENT | PG_GLOBAL | PG_RW | PG_SELF (self-reference)
DQ boot_pml4 + 0x203 ; PG_PRESENT | PG_RW | PG_SELF (self-reference)
boot_pgd:
DQ boot_pgt + 0x107 ; PG_PRESENT | PG_GLOBAL | PG_RW | PG_USER
DQ boot_pgt + 0x7 ; PG_PRESENT | PG_RW | PG_USER
times 510 DQ 0 ; PAGE_MAP_ENTRIES - 2
DQ boot_pml4 + 0x303 ; PG_PRESENT | PG_GLOBAL | PG_RW | PG_SELF (self-reference)
DQ boot_pml4 + 0x203 ; PG_PRESENT | PG_RW | PG_SELF (self-reference)
boot_pgt:
times 512 DQ 0