From 34536d78068318def0a370462cbc3319e1ca9014 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Tue, 19 May 2020 05:49:22 +0000 Subject: powerpc/8xx: Add a function to early map kernel via huge pages Add a function to early map kernel memory using huge pages. For 512k pages, just use standard page table and map in using 512k pages. For 8M pages, create a hugepd table and populate the two PGD entries with it. This function can only be used to create page tables at startup. Once the regular SLAB allocation functions replace memblock functions, this function cannot allocate new pages anymore. However it can still update existing mappings with new protections. hugepd_none() macro is moved into asm/hugetlb.h to be usable outside of mm/hugetlbpage.c early_pte_alloc_kernel() is made visible. _PAGE_HUGE flag is now displayed by ptdump. Signed-off-by: Christophe Leroy [mpe: Change ptdump display to use "huge"] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/68325bcd3b6f93127f7810418a2352c3519066d6.1589866984.git.christophe.leroy@csgroup.eu --- arch/powerpc/mm/ptdump/8xx.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/powerpc/mm/ptdump') diff --git a/arch/powerpc/mm/ptdump/8xx.c b/arch/powerpc/mm/ptdump/8xx.c index 9e2d8e847d6e..4bc350736c1d 100644 --- a/arch/powerpc/mm/ptdump/8xx.c +++ b/arch/powerpc/mm/ptdump/8xx.c @@ -11,6 +11,11 @@ static const struct flag_info flag_array[] = { { + .mask = _PAGE_HUGE, + .val = _PAGE_HUGE, + .set = "huge", + .clear = " ", + }, { .mask = _PAGE_SH, .val = 0, .set = "user", -- cgit v1.2.3