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Implement pmap_mincore() for riscv.

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Reviewed by:	alc, br
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D16444
This commit is contained in:
Mark Johnston 2018-07-26 16:08:26 +00:00
parent 28c20ad06c
commit a3055a5e47
1 changed files with 47 additions and 1 deletions
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48
sys/riscv/riscv/pmap.c
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@ -389,6 +389,13 @@ pmap_l3_valid_cacheable(pt_entry_t l3)
#define PTE_SYNC(pte) cpu_dcache_wb_range((vm_offset_t)pte, sizeof(*pte))
static inline int
pmap_page_accessed(pt_entry_t pte)
{
return (pte & PTE_A);
}
/* Checks if the page is dirty. */
static inline int
pmap_page_dirty(pt_entry_t pte)
@ -3176,8 +3183,47 @@ pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma)
int
pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa)
{
pt_entry_t *l2, *l3, tpte;
vm_paddr_t pa;
int val;
bool managed;
panic("RISCVTODO: pmap_mincore");
PMAP_LOCK(pmap);
retry:
managed = false;
val = 0;
l2 = pmap_l2(pmap, addr);
if (l2 != NULL && ((tpte = pmap_load(l2)) & PTE_V) != 0) {
if ((tpte & (PTE_R | PTE_W | PTE_X)) != 0) {
pa = PTE_TO_PHYS(tpte) | (addr & L2_OFFSET);
val = MINCORE_INCORE | MINCORE_SUPER;
} else {
l3 = pmap_l2_to_l3(l2, addr);
tpte = pmap_load(l3);
if ((tpte & PTE_V) == 0)
goto done;
pa = PTE_TO_PHYS(tpte) | (addr & L3_OFFSET);
val = MINCORE_INCORE;
}
if (pmap_page_dirty(tpte))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
if (pmap_page_accessed(tpte))
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
managed = (tpte & PTE_SW_MANAGED) == PTE_SW_MANAGED;
}
done:
if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) !=
(MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) && managed) {
/* Ensure that "PHYS_TO_VM_PAGE(pa)->object" doesn't change. */
if (vm_page_pa_tryrelock(pmap, pa, locked_pa))
goto retry;
} else
PA_UNLOCK_COND(*locked_pa);
PMAP_UNLOCK(pmap);
return (val);
}
void