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Add pmap_get_tables() for riscv.

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This mirrors the arm64 implementation and is for use in the minidump
code.

Submitted by:	Mitchell Horne <mhorne063@gmail.com>
Differential Revision:	https://reviews.freebsd.org/D18321
This commit is contained in:
Mark Johnston 2019-03-05 23:56:40 +00:00
parent 835adc6898
commit 91c3fda00b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=344827
1 changed files with 37 additions and 0 deletions
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37
sys/riscv/riscv/pmap.c
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@ -4438,3 +4438,40 @@ pmap_is_valid_memattr(pmap_t pmap __unused, vm_memattr_t mode)
return (mode >= VM_MEMATTR_DEVICE && mode <= VM_MEMATTR_WRITE_BACK);
}
bool
pmap_get_tables(pmap_t pmap, vm_offset_t va, pd_entry_t **l1, pd_entry_t **l2,
pt_entry_t **l3)
{
pd_entry_t *l1p, *l2p;
/* Get l1 directory entry. */
l1p = pmap_l1(pmap, va);
*l1 = l1p;
if (l1p == NULL || (pmap_load(l1p) & PTE_V) == 0)
return (false);
if ((pmap_load(l1p) & PTE_RX) != 0) {
*l2 = NULL;
*l3 = NULL;
return (true);
}
/* Get l2 directory entry. */
l2p = pmap_l1_to_l2(l1p, va);
*l2 = l2p;
if (l2p == NULL || (pmap_load(l2p) & PTE_V) == 0)
return (false);
if ((pmap_load(l2p) & PTE_RX) != 0) {
*l3 = NULL;
return (true);
}
/* Get l3 page table entry. */
*l3 = pmap_l2_to_l3(l2p, va);
return (true);
}