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target-sparc: implement auto-demapping for UA2005 CPUs

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Backports commit 70f44d2f4bce44fa04426def3290306fa8064b91 from qemu
This commit is contained in:
Artyom Tarasenko 2018-03-01 22:22:00 -05:00 committed by Lioncash
parent b20b29fc8e
commit 49e61dc62f
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 23 additions and 0 deletions
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23
qemu/target-sparc/ldst_helper.c
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@ -213,6 +213,29 @@ static void replace_tlb_1bit_lru(SparcTLBEntry *tlb,
{
unsigned int i, replace_used;
if (cpu_has_hypervisor(env1)) {
uint64_t new_vaddr = tlb_tag & ~0x1fffULL;
uint64_t new_size = 8192ULL << 3 * TTE_PGSIZE(tlb_tte);
uint32_t new_ctx = tlb_tag & 0x1fffU;
for (i = 0; i < 64; i++) {
uint32_t ctx = tlb[i].tag & 0x1fffU;
/* check if new mapping overlaps an existing one */
if (new_ctx == ctx) {
uint64_t vaddr = tlb[i].tag & ~0x1fffULL;
uint64_t size = 8192ULL << 3 * TTE_PGSIZE(tlb[i].tte);
if (new_vaddr == vaddr
|| (new_vaddr < vaddr + size
&& vaddr < new_vaddr + new_size)) {
DPRINTF_MMU("auto demap entry [%d] %lx->%lx\n", i, vaddr,
new_vaddr);
replace_tlb_entry(&tlb[i], tlb_tag, tlb_tte, env1);
return;
}
}
}
}
/* Try replacing invalid entry */
for (i = 0; i < 64; i++) {
if (!TTE_IS_VALID(tlb[i].tte)) {