| 1 |
|
| 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
|
| 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 |
|
| 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_MITIGATION_PAGE_TABLE_ISOLATION
|
| 55 | # define X86_CR3_PTI_PCID_USER_BIT 11
|
| 56 | #endif
|
| 57 |
|
| 58 | #endif
|