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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 03:43:31 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 03:43:31 +0000 |
| commit | 1327913aeadf5737e7ebf158f93632d6df2eba1d (patch) | |
| tree | 2ca5c2a3aa381788eca2580f72a2d5c60934b28a /arch/arm/mm | |
| parent | Adding upstream version 4.19.260. (diff) | |
| download | linux-1327913aeadf5737e7ebf158f93632d6df2eba1d.tar.xz linux-1327913aeadf5737e7ebf158f93632d6df2eba1d.zip | |
Adding upstream version 4.19.269.upstream/4.19.269
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/arm/mm/nommu.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c index 7d67c70bb..e803fd162 100644 --- a/arch/arm/mm/nommu.c +++ b/arch/arm/mm/nommu.c @@ -25,6 +25,13 @@ unsigned long vectors_base; +/* + * empty_zero_page is a special page that is used for + * zero-initialized data and COW. + */ +struct page *empty_zero_page; +EXPORT_SYMBOL(empty_zero_page); + #ifdef CONFIG_ARM_MPU struct mpu_rgn_info mpu_rgn_info; #endif @@ -147,9 +154,21 @@ void __init adjust_lowmem_bounds(void) */ void __init paging_init(const struct machine_desc *mdesc) { + void *zero_page; + early_trap_init((void *)vectors_base); mpu_setup(); + + /* allocate the zero page. */ + zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!zero_page) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, PAGE_SIZE, PAGE_SIZE); + bootmem_init(); + + empty_zero_page = virt_to_page(zero_page); + flush_dcache_page(empty_zero_page); } /* |