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1965aae3 PA |
1 | #ifndef _ASM_X86_PROCESSOR_FLAGS_H |
2 | #define _ASM_X86_PROCESSOR_FLAGS_H | |
b4531e86 | 3 | |
af170c50 | 4 | #include <uapi/asm/processor-flags.h> |
b4531e86 | 5 | |
6330a30a VN |
6 | #ifdef CONFIG_VM86 |
7 | #define X86_VM_MASK X86_EFLAGS_VM | |
8 | #else | |
9 | #define X86_VM_MASK 0 /* No VM86 support */ | |
10 | #endif | |
6c690ee1 AL |
11 | |
12 | /* | |
13 | * CR3's layout varies depending on several things. | |
14 | * | |
15 | * If CR4.PCIDE is set (64-bit only), then CR3[11:0] is the address space ID. | |
16 | * If PAE is enabled, then CR3[11:5] is part of the PDPT address | |
17 | * (i.e. it's 32-byte aligned, not page-aligned) and CR3[4:0] is ignored. | |
18 | * Otherwise (non-PAE, non-PCID), CR3[3] is PWT, CR3[4] is PCD, and | |
19 | * CR3[2:0] and CR3[11:5] are ignored. | |
20 | * | |
21 | * In all cases, Linux puts zeros in the low ignored bits and in PWT and PCD. | |
22 | * | |
23 | * CR3[63] is always read as zero. If CR4.PCIDE is set, then CR3[63] may be | |
24 | * written as 1 to prevent the write to CR3 from flushing the TLB. | |
25 | * | |
26 | * On systems with SME, one bit (in a variable position!) is stolen to indicate | |
27 | * that the top-level paging structure is encrypted. | |
28 | * | |
29 | * All of the remaining bits indicate the physical address of the top-level | |
30 | * paging structure. | |
31 | * | |
32 | * CR3_ADDR_MASK is the mask used by read_cr3_pa(). | |
33 | */ | |
34 | #ifdef CONFIG_X86_64 | |
35 | /* Mask off the address space ID bits. */ | |
36 | #define CR3_ADDR_MASK 0x7FFFFFFFFFFFF000ull | |
37 | #define CR3_PCID_MASK 0xFFFull | |
38 | #else | |
39 | /* | |
40 | * CR3_ADDR_MASK needs at least bits 31:5 set on PAE systems, and we save | |
41 | * a tiny bit of code size by setting all the bits. | |
42 | */ | |
43 | #define CR3_ADDR_MASK 0xFFFFFFFFull | |
44 | #define CR3_PCID_MASK 0ull | |
45 | #endif | |
46 | ||
1965aae3 | 47 | #endif /* _ASM_X86_PROCESSOR_FLAGS_H */ |