OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

target-xtensa: update autorefill TLB entries conditionally

Browse Source 
This is to avoid interference of internal QEMU helpers
(cpu_get_phys_page_debug, tb_invalidate_virtual_addr) with guest-visible
TLB state.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2012-05-27 18:34:52 +04:00 committed by Blue Swirl
parent 16bde77a29
commit ae4e7982e6
3 changed files with 35 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
target-xtensa/cpu.h
View File

@ -386,7 +386,7 @@ void xtensa_tlb_set_entry_mmu(const CPUXtensaState *env,
unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
void xtensa_tlb_set_entry(CPUXtensaState *env, bool dtlb,
unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
int xtensa_get_physical_addr(CPUXtensaState *env,
int xtensa_get_physical_addr(CPUXtensaState *env, bool update_tlb,
uint32_t vaddr, int is_write, int mmu_idx,
uint32_t *paddr, uint32_t *page_size, unsigned *access);
void reset_mmu(CPUXtensaState *env);

56
target-xtensa/helper.c
View File

@ -130,11 +130,11 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUXtensaState *env, target_ulong add
uint32_t page_size;
unsigned access;
if (xtensa_get_physical_addr(env, addr, 0, 0,
if (xtensa_get_physical_addr(env, false, addr, 0, 0,
&paddr, &page_size, &access) == 0) {
return paddr;
}
if (xtensa_get_physical_addr(env, addr, 2, 0,
if (xtensa_get_physical_addr(env, false, addr, 2, 0,
&paddr, &page_size, &access) == 0) {
return paddr;
}
@ -443,10 +443,9 @@ static bool is_access_granted(unsigned access, int is_write)
}
}
static int autorefill_mmu(CPUXtensaState *env, uint32_t vaddr, bool dtlb,
uint32_t *wi, uint32_t *ei, uint8_t *ring);
static int get_pte(CPUXtensaState *env, uint32_t vaddr, uint32_t *pte);
static int get_physical_addr_mmu(CPUXtensaState *env,
static int get_physical_addr_mmu(CPUXtensaState *env, bool update_tlb,
uint32_t vaddr, int is_write, int mmu_idx,
uint32_t *paddr, uint32_t *page_size, unsigned *access)
{
@ -454,19 +453,38 @@ static int get_physical_addr_mmu(CPUXtensaState *env,
uint32_t wi;
uint32_t ei;
uint8_t ring;
uint32_t vpn;
uint32_t pte;
const xtensa_tlb_entry *entry = NULL;
xtensa_tlb_entry tmp_entry;
int ret = xtensa_tlb_lookup(env, vaddr, dtlb, &wi, &ei, &ring);
if ((ret == INST_TLB_MISS_CAUSE || ret == LOAD_STORE_TLB_MISS_CAUSE) &&
(mmu_idx != 0 || ((vaddr ^ env->sregs[PTEVADDR]) & 0xffc00000)) &&
autorefill_mmu(env, vaddr, dtlb, &wi, &ei, &ring) == 0) {
get_pte(env, vaddr, &pte) == 0) {
ring = (pte >> 4) & 0x3;
wi = 0;
split_tlb_entry_spec_way(env, vaddr, dtlb, &vpn, wi, &ei);
if (update_tlb) {
wi = ++env->autorefill_idx & 0x3;
xtensa_tlb_set_entry(env, dtlb, wi, ei, vpn, pte);
env->sregs[EXCVADDR] = vaddr;
qemu_log("%s: autorefill(%08x): %08x -> %08x\n",
__func__, vaddr, vpn, pte);
} else {
xtensa_tlb_set_entry_mmu(env, &tmp_entry, dtlb, wi, ei, vpn, pte);
entry = &tmp_entry;
}
ret = 0;
}
if (ret != 0) {
return ret;
}
const xtensa_tlb_entry *entry =
xtensa_tlb_get_entry(env, dtlb, wi, ei);
if (entry == NULL) {
entry = xtensa_tlb_get_entry(env, dtlb, wi, ei);
}
if (ring < mmu_idx) {
return dtlb ?
@ -489,31 +507,21 @@ static int get_physical_addr_mmu(CPUXtensaState *env,
return 0;
}
static int autorefill_mmu(CPUXtensaState *env, uint32_t vaddr, bool dtlb,
uint32_t *wi, uint32_t *ei, uint8_t *ring)
static int get_pte(CPUXtensaState *env, uint32_t vaddr, uint32_t *pte)
{
uint32_t paddr;
uint32_t page_size;
unsigned access;
uint32_t pt_vaddr =
(env->sregs[PTEVADDR] | (vaddr >> 10)) & 0xfffffffc;
int ret = get_physical_addr_mmu(env, pt_vaddr, 0, 0,
int ret = get_physical_addr_mmu(env, false, pt_vaddr, 0, 0,
&paddr, &page_size, &access);
qemu_log("%s: trying autorefill(%08x) -> %08x\n", __func__,
vaddr, ret ? ~0 : paddr);
if (ret == 0) {
uint32_t vpn;
uint32_t pte = ldl_phys(paddr);
*ring = (pte >> 4) & 0x3;
*wi = (++env->autorefill_idx) & 0x3;
split_tlb_entry_spec_way(env, vaddr, dtlb, &vpn, *wi, ei);
xtensa_tlb_set_entry(env, dtlb, *wi, *ei, vpn, pte);
env->sregs[EXCVADDR] = vaddr;
qemu_log("%s: autorefill(%08x): %08x -> %08x\n",
__func__, vaddr, vpn, pte);
*pte = ldl_phys(paddr);
}
return ret;
}
@ -549,13 +557,13 @@ static int get_physical_addr_region(CPUXtensaState *env,
*
* \return 0 if ok, exception cause code otherwise
*/
int xtensa_get_physical_addr(CPUXtensaState *env,
int xtensa_get_physical_addr(CPUXtensaState *env, bool update_tlb,
uint32_t vaddr, int is_write, int mmu_idx,
uint32_t *paddr, uint32_t *page_size, unsigned *access)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
return get_physical_addr_mmu(env, vaddr, is_write, mmu_idx,
paddr, page_size, access);
return get_physical_addr_mmu(env, update_tlb,
vaddr, is_write, mmu_idx, paddr, page_size, access);
} else if (xtensa_option_bits_enabled(env->config,
XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_PROTECTION) |
XTENSA_OPTION_BIT(XTENSA_OPTION_REGION_TRANSLATION))) {

4
target-xtensa/op_helper.c
View File

@ -79,7 +79,7 @@ void tlb_fill(CPUXtensaState *env1, target_ulong vaddr, int is_write, int mmu_id
uint32_t paddr;
uint32_t page_size;
unsigned access;
int ret = xtensa_get_physical_addr(env, vaddr, is_write, mmu_idx,
int ret = xtensa_get_physical_addr(env, true, vaddr, is_write, mmu_idx,
&paddr, &page_size, &access);
qemu_log("%s(%08x, %d, %d) -> %08x, ret = %d\n", __func__,
@ -103,7 +103,7 @@ static void tb_invalidate_virtual_addr(CPUXtensaState *env, uint32_t vaddr)
uint32_t paddr;
uint32_t page_size;
unsigned access;
int ret = xtensa_get_physical_addr(env, vaddr, 2, 0,
int ret = xtensa_get_physical_addr(env, false, vaddr, 2, 0,
&paddr, &page_size, &access);
if (ret == 0) {
tb_invalidate_phys_addr(paddr);