59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PROCESSOR_FLAGS_H
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#define _ASM_X86_PROCESSOR_FLAGS_H
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#include <uapi/asm/processor-flags.h>
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#include <linux/mem_encrypt.h>
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#ifdef CONFIG_VM86
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#define X86_VM_MASK X86_EFLAGS_VM
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#else
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#define X86_VM_MASK 0 /* No VM86 support */
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#endif
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/*
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* CR3's layout varies depending on several things.
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*
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* If CR4.PCIDE is set (64-bit only), then CR3[11:0] is the address space ID.
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* If PAE is enabled, then CR3[11:5] is part of the PDPT address
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* (i.e. it's 32-byte aligned, not page-aligned) and CR3[4:0] is ignored.
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* Otherwise (non-PAE, non-PCID), CR3[3] is PWT, CR3[4] is PCD, and
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* CR3[2:0] and CR3[11:5] are ignored.
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*
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* In all cases, Linux puts zeros in the low ignored bits and in PWT and PCD.
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*
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* CR3[63] is always read as zero. If CR4.PCIDE is set, then CR3[63] may be
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* written as 1 to prevent the write to CR3 from flushing the TLB.
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*
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* On systems with SME, one bit (in a variable position!) is stolen to indicate
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* that the top-level paging structure is encrypted.
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*
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* On systemms with LAM, bits 61 and 62 are used to indicate LAM mode.
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*
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* All of the remaining bits indicate the physical address of the top-level
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* paging structure.
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*
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* CR3_ADDR_MASK is the mask used by read_cr3_pa().
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*/
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#ifdef CONFIG_X86_64
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/* Mask off the address space ID and SME encryption bits. */
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#define CR3_ADDR_MASK __sme_clr(PHYSICAL_PAGE_MASK)
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#define CR3_PCID_MASK 0xFFFull
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#define CR3_NOFLUSH BIT_ULL(63)
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#else
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/*
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* CR3_ADDR_MASK needs at least bits 31:5 set on PAE systems, and we save
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* a tiny bit of code size by setting all the bits.
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*/
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#define CR3_ADDR_MASK 0xFFFFFFFFull
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#define CR3_PCID_MASK 0ull
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#define CR3_NOFLUSH 0
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#endif
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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# define X86_CR3_PTI_PCID_USER_BIT 11
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#endif
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#endif /* _ASM_X86_PROCESSOR_FLAGS_H */
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