vasilito
dc68054305
- Restore 29 recipe symlinks (libdrm, qtbase, dbus, sddm, pipewire, etc.) - Restore 33 patches (KDE, libdrm, mesa, pipewire, sddm, wireplumber) - Restore 20+ local/scripts (audit, lint, test, build helpers) - Restore src/cook/scheduler.rs, status.rs, gnu-config/ - Restore scripts/patch-inclusion-gate.sh, run_mini1.sh, validate-collision-log.sh - Recover TLC source from HEAD (was overwritten by 0.2.3 checkout) - Recover 11 local/docs plans from HEAD (were overwritten) - Recover qt6-wayland-smoke symlink from HEAD - Fix MOTD: remove garbled ASCII art, use clean text - Update version: 0.2.0 -> 0.2.4 in os-release, motd, config - Reduce filesystem_size: 1536 -> 512 MiB - Add ABSOLUTE RULE to AGENTS.md: never delete/ignore packages - Reduce pcid scheme log verbosity: info -> debug
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_PGTABLE_INVERT_H
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#define _ASM_PGTABLE_INVERT_H 1
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#ifndef __ASSEMBLER__
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/*
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* A clear pte value is special, and doesn't get inverted.
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*
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* Note that even users that only pass a pgprot_t (rather
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* than a full pte) won't trigger the special zero case,
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* because even PAGE_NONE has _PAGE_PROTNONE | _PAGE_ACCESSED
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* set. So the all zero case really is limited to just the
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* cleared page table entry case.
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*/
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static inline bool __pte_needs_invert(u64 val)
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{
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return val && !(val & _PAGE_PRESENT);
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}
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/* Get a mask to xor with the page table entry to get the correct pfn. */
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static inline u64 protnone_mask(u64 val)
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{
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return __pte_needs_invert(val) ? ~0ull : 0;
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}
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static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask)
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{
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/*
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* When a PTE transitions from NONE to !NONE or vice-versa
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* invert the PFN part to stop speculation.
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* pte_pfn undoes this when needed.
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*/
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if (__pte_needs_invert(oldval) != __pte_needs_invert(val))
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val = (val & ~mask) | (~val & mask);
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return val;
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}
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#endif /* __ASSEMBLER__ */
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#endif
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