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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-19 05:48:58 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-26 22:22:19 +1000 |
| commit | 925ac141d106b55acbe112a9272f970631a3c082 (patch) | |
| tree | dd8af6d39c2dc563a235af298b36cb964105f2f2 /arch/powerpc/mm | |
| parent | 4b19f96a81bceaf0bcf44d79c0855c61158065ec (diff) | |
| download | linux-925ac141d106b55acbe112a9272f970631a3c082.tar.bz2 | |
powerpc/mm: Allocate static page tables for fixmap
Allocate static page tables for the fixmap area. This allows
setting mappings through page tables before memblock is ready.
That's needed to use early_ioremap() early and to use standard
page mappings with fixmap.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4f4b1412d34de6801b8e925cb88fc69d056ff536.1589866984.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index f62de06e3d07..9934659cb871 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -29,11 +29,27 @@ #include <asm/fixmap.h> #include <asm/setup.h> #include <asm/sections.h> +#include <asm/early_ioremap.h> #include <mm/mmu_decl.h> extern char etext[], _stext[], _sinittext[], _einittext[]; +static u8 early_fixmap_pagetable[FIXMAP_PTE_SIZE] __page_aligned_data; + +notrace void __init early_ioremap_init(void) +{ + unsigned long addr = ALIGN_DOWN(FIXADDR_START, PGDIR_SIZE); + pte_t *ptep = (pte_t *)early_fixmap_pagetable; + pmd_t *pmdp = pmd_ptr_k(addr); + + for (; (s32)(FIXADDR_TOP - addr) > 0; + addr += PGDIR_SIZE, ptep += PTRS_PER_PTE, pmdp++) + pmd_populate_kernel(&init_mm, pmdp, ptep); + + early_ioremap_setup(); +} + static void __init *early_alloc_pgtable(unsigned long size) { void *ptr = memblock_alloc(size, size); |