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[libcpu][risc-v]add code for handling exception scenarios in _unmap_area.

This commit is contained in:
ligr 2025-03-13 12:29:55 +08:00 committed by Rbb666
parent b04aacbd94
commit 9da813b151
1 changed files with 17 additions and 0 deletions
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17
libcpu/risc-v/common64/mmu.c
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@ -263,10 +263,23 @@ static size_t _unmap_area(struct rt_aspace *aspace, void *v_addr)
lvl_entry[i] = ((rt_ubase_t *)aspace->page_table + lvl_off[i]);
pentry = lvl_entry[i];
/* check if lvl_entry[0] is valid. if no, return 0 directly. */
if (!PTE_USED(*pentry))
{
return 0;
}
/* find leaf page table entry */
while (PTE_USED(*pentry) && !PAGE_IS_LEAF(*pentry))
{
i += 1;
if (i >= 3)
{
unmapped = 0;
break;
}
lvl_entry[i] = ((rt_ubase_t *)PPN_TO_VPN(GET_PADDR(*pentry), PV_OFFSET) +
lvl_off[i]);
pentry = lvl_entry[i];
@ -278,6 +291,10 @@ static size_t _unmap_area(struct rt_aspace *aspace, void *v_addr)
{
_unmap_pte(pentry, lvl_entry, i);
}
else
{
unmapped = 0; /* invalid pte, return 0. */
}
return unmapped;
}