Date: Wed, 22 Apr 2026 21:08:32 +0000 From: Bjoern A. Zeeb <bz@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Cc: Jean-=?utf-8?Q?S=C3=A9bast?==?utf-8?Q?ien P=C3=A9?=dron <dumbbell@FreeBSD.org> Subject: git: 16c33bddb6f7 - stable/15 - linuxkpi: Define `PMD_SHIFT` Message-ID: <69e938d0.26dcf.7935f352@gitrepo.freebsd.org>
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The branch stable/15 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=16c33bddb6f7a7238e033fc09a3f2403ba113df5 commit 16c33bddb6f7a7238e033fc09a3f2403ba113df5 Author: Jean-Sébastien Pédron <dumbbell@FreeBSD.org> AuthorDate: 2026-03-04 20:36:20 +0000 Commit: Bjoern A. Zeeb <bz@FreeBSD.org> CommitDate: 2026-04-22 20:57:01 +0000 linuxkpi: Define `PMD_SHIFT` For now, only define it for x86 architectures. The DRM generic code started to use it in Linux 6.11. Reviewed by: bz, emaste Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D55734 (cherry picked from commit be92ad6b12a5046cecf25477e7a3e88f70e5daee) --- sys/compat/linuxkpi/common/include/asm/pgtable.h | 34 ++++++++++++++++++++++++ 1 file changed, 34 insertions(+) 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_ */home | help
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