diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/include/asm/pgtable.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/asm/pgtable.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/asm/pgtable.h b/sys/compat/linuxkpi/common/include/asm/pgtable.h index 865662d587db..166d6142d51c 100644 --- a/sys/compat/linuxkpi/common/include/asm/pgtable.h +++ b/sys/compat/linuxkpi/common/include/asm/pgtable.h @@ -53,6 +53,40 @@ typedef struct page *pgtable_t; #define _PAGE_PWT (((pteval_t) 1) << _PAGE_BIT_PWT) #define _PAGE_PCD (((pteval_t) 1) << _PAGE_BIT_PCD) #define _PAGE_PAT (((pteval_t) 1) << _PAGE_BIT_PAT) + +/* + * On Linux, the value of `PMD_SHIFT` is hard-coded to 21. This corresponds to + * the FreeBSD `PDRSHIFT` constant. + */ +#define PMD_SHIFT PDRSHIFT + +#elif defined(__aarch64__) + +/* + * On Linux, the value of `PMD_SHIFT` is computed from `CONFIG_PGTABLE_LEVELS`. + * The result corresponds to one of the FreeBSD `L*_SHIFT` constants. Here, we + * take the value 21 computed from `CONFIG_PGTABLE_LEVELS = 4`, the default on + * aarch64, which equals to `L2_SHIFT`. + */ +#define PMD_SHIFT L2_SHIFT + +#elif defined(__powerpc__) + +/* + * On Linux, the value of `PMD_SHIFT` is the addition of `PAGE_SHIFT` and + * `PTE_INDEX_SIZE` (hard-coded to 9). The result corresponds to the FreeBSD + * `L3_PAGE_SIZE_SHIFT` constant. + */ +#define PMD_SHIFT L3_PAGE_SIZE_SHIFT + +#elif defined(__riscv) + +/* + * On Linux, the value of `PMD_SHIFT` is hard-coded to 21. This corresponds to + * the FreeBSD `L2_SHIFT` constant. + */ +#define PMD_SHIFT L2_SHIFT + #endif #endif /* _LINUXKPI_ASM_PGTABLE_H_ */ |