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xtensa: mmu: no longer identity map the first 512MB

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This removes the identity map of the first 512MB in TLB way 6.
Or else it would interfere with mapped entries resulting in
double mapped TLB exception.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2023-08-16 16:33:47 -07:00 • committed by Anas Nashif
commit 614e64325d
1 changed files with 3 additions and 6 deletions
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9
arch/xtensa/core/xtensa_mmu.c
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@ -272,13 +272,10 @@ static void xtensa_mmu_init(bool is_core0)
:: "a"(Z_XTENSA_PTEVADDR + MB(4)));
/* Finally, lets invalidate entries in the way 6 that are no longer
* needed. We keep 0x00000000 to 0x200000000 since
* this region is directly accessed elsewhere
* and remove them now is not gonna work. TODO: Map whathever is necessary
* into the kernel virtual space and unmap these regions.
/* Finally, lets invalidate all entries in way 6 as the page tables
* should have already mapped the regions we care about for boot.
*/
for (entry = 1; entry < 8; entry++) {
for (entry = 0; entry < 8; entry++) {
__asm__ volatile("idtlb %[idx]\n\t"
"iitlb %[idx]\n\t"
"dsync\n\t"