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kernel/arm/paging: zero out the bottom portion of the new pgdir

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Change-Id: I899f288f451dd4c413403cd0e14a855f68355050
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4866
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
This commit is contained in:
David Karoly 2022-01-14 15:56:01 +01:00 committed by Adrien Destugues
parent 933430df22
commit b57ffe4006
2 changed files with 3 additions and 4 deletions
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3
src/system/kernel/arch/arm/paging/32bit/ARMPagingStructures32Bit.cpp
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@ -65,11 +65,10 @@ ARMPagingStructures32Bit::Init(page_directory_entry* virtualPageDir,
pgdir_virt = virtualPageDir;
pgdir_phys = physicalPageDir;
#if 0 // IRA: handle UART better; identity map of DEVICE_BASE from loader gets wiped here
// zero out the bottom portion of the new pgdir
memset(pgdir_virt + FIRST_USER_PGDIR_ENT, 0,
NUM_USER_PGDIR_ENTS * sizeof(page_directory_entry));
#endif
// insert this new map into the map list
{
int state = disable_interrupts();

4
src/system/kernel/arch/arm/paging/32bit/paging.h
View File

@ -21,12 +21,12 @@
#define FIRST_USER_PGDIR_ENT (VADDR_TO_PDENT(USER_BASE))
#define NUM_USER_PGDIR_ENTS (VADDR_TO_PDENT(ROUNDUP(USER_SIZE, \
B_PAGE_SIZE * 1024)))
B_PAGE_SIZE * ARM_MMU_L2_COARSE_ENTRY_COUNT)))
#define FIRST_KERNEL_PGDIR_ENT (VADDR_TO_PDENT(KERNEL_BASE))
#define NUM_KERNEL_PGDIR_ENTS (VADDR_TO_PDENT(KERNEL_SIZE))
static const size_t kPageTableAlignment = 1024 * B_PAGE_SIZE;
static const size_t kPageTableAlignment = ARM_MMU_L2_COARSE_ENTRY_COUNT * B_PAGE_SIZE;
typedef uint32 page_table_entry;