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_MITIGATION_PAGE_TABLE_ISOLATION 55 # define X86_CR3_PTI_PCID_USER_BIT 11 56 #endif 57 58 #endif /* _ASM_X86_PROCESSOR_FLAGS_H */ 59
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