1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _ASM_X86_PROCESSOR_FLAGS_H |
3 | #define _ASM_X86_PROCESSOR_FLAGS_H |
4 | |
5 | #include <uapi/asm/processor-flags.h> |
6 | #include <linux/mem_encrypt.h> |
7 | |
8 | #ifdef CONFIG_VM86 |
9 | #define X86_VM_MASK X86_EFLAGS_VM |
10 | #else |
11 | #define X86_VM_MASK 0 /* No VM86 support */ |
12 | #endif |
13 | |
14 | /* |
15 | * CR3's layout varies depending on several things. |
16 | * |
17 | * If CR4.PCIDE is set (64-bit only), then CR3[11:0] is the address space ID. |
18 | * If PAE is enabled, then CR3[11:5] is part of the PDPT address |
19 | * (i.e. it's 32-byte aligned, not page-aligned) and CR3[4:0] is ignored. |
20 | * Otherwise (non-PAE, non-PCID), CR3[3] is PWT, CR3[4] is PCD, and |
21 | * CR3[2:0] and CR3[11:5] are ignored. |
22 | * |
23 | * In all cases, Linux puts zeros in the low ignored bits and in PWT and PCD. |
24 | * |
25 | * CR3[63] is always read as zero. If CR4.PCIDE is set, then CR3[63] may be |
26 | * written as 1 to prevent the write to CR3 from flushing the TLB. |
27 | * |
28 | * On systems with SME, one bit (in a variable position!) is stolen to indicate |
29 | * that the top-level paging structure is encrypted. |
30 | * |
31 | * On systemms with LAM, bits 61 and 62 are used to indicate LAM mode. |
32 | * |
33 | * All of the remaining bits indicate the physical address of the top-level |
34 | * paging structure. |
35 | * |
36 | * CR3_ADDR_MASK is the mask used by read_cr3_pa(). |
37 | */ |
38 | #ifdef CONFIG_X86_64 |
39 | /* Mask off the address space ID and SME encryption bits. */ |
40 | #define CR3_ADDR_MASK __sme_clr(PHYSICAL_PAGE_MASK) |
41 | #define CR3_PCID_MASK 0xFFFull |
42 | #define CR3_NOFLUSH BIT_ULL(63) |
43 | |
44 | #else |
45 | /* |
46 | * CR3_ADDR_MASK needs at least bits 31:5 set on PAE systems, and we save |
47 | * a tiny bit of code size by setting all the bits. |
48 | */ |
49 | #define CR3_ADDR_MASK 0xFFFFFFFFull |
50 | #define CR3_PCID_MASK 0ull |
51 | #define CR3_NOFLUSH 0 |
52 | #endif |
53 | |
54 | #ifdef CONFIG_PAGE_TABLE_ISOLATION |
55 | # define X86_CR3_PTI_PCID_USER_BIT 11 |
56 | #endif |
57 | |
58 | #endif /* _ASM_X86_PROCESSOR_FLAGS_H */ |
59 | |