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target/arm: Cache the Tagged bit for a page in MemTxAttrs 

This "bit" is a particular value of the page's MemAttr.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200626033144.790098-43-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
master
Richard Henderson 2020-06-25 20:31:40 -07:00 committed by Peter Maydell
parent 7e98e21c09
commit 337a03f07f
2 changed files with 50 additions and 3 deletions
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48
target/arm/helper.c
View File

@ -11834,9 +11834,19 @@ static uint8_t combine_cacheattr_nibble(uint8_t s1, uint8_t s2)
*/
static ARMCacheAttrs combine_cacheattrs(ARMCacheAttrs s1, ARMCacheAttrs s2)
{
uint8_t s1lo = extract32(s1.attrs, 0, 4), s2lo = extract32(s2.attrs, 0, 4);
uint8_t s1hi = extract32(s1.attrs, 4, 4), s2hi = extract32(s2.attrs, 4, 4);
uint8_t s1lo, s2lo, s1hi, s2hi;
ARMCacheAttrs ret;
bool tagged = false;
if (s1.attrs == 0xf0) {
tagged = true;
s1.attrs = 0xff;
}
s1lo = extract32(s1.attrs, 0, 4);
s2lo = extract32(s2.attrs, 0, 4);
s1hi = extract32(s1.attrs, 4, 4);
s2hi = extract32(s2.attrs, 4, 4);
/* Combine shareability attributes (table D4-43) */
if (s1.shareability == 2 || s2.shareability == 2) {
@ -11884,6 +11894,11 @@ static ARMCacheAttrs combine_cacheattrs(ARMCacheAttrs s1, ARMCacheAttrs s2)
}
}
/* TODO: CombineS1S2Desc does not consider transient, only WB, RWA. */
if (tagged && ret.attrs == 0xff) {
ret.attrs = 0xf0;
}
return ret;
}
@ -11963,8 +11978,11 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
* Normal Non-Shareable,
* Inner Write-Back Read-Allocate Write-Allocate,
* Outer Write-Back Read-Allocate Write-Allocate.
* Do not overwrite Tagged within attrs.
*/
cacheattrs->attrs = 0xff;
if (cacheattrs->attrs != 0xf0) {
cacheattrs->attrs = 0xff;
}
cacheattrs->shareability = 0;
}
*cacheattrs = combine_cacheattrs(*cacheattrs, cacheattrs2);
@ -12029,6 +12047,9 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
/* Definitely a real MMU, not an MPU */
if (regime_translation_disabled(env, mmu_idx)) {
uint64_t hcr;
uint8_t memattr;
/*
* MMU disabled. S1 addresses within aa64 translation regimes are
* still checked for bounds -- see AArch64.TranslateAddressS1Off.
@ -12066,6 +12087,27 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
*phys_ptr = address;
*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
*page_size = TARGET_PAGE_SIZE;
/* Fill in cacheattr a-la AArch64.TranslateAddressS1Off. */
hcr = arm_hcr_el2_eff(env);
cacheattrs->shareability = 0;
if (hcr & HCR_DC) {
if (hcr & HCR_DCT) {
memattr = 0xf0; /* Tagged, Normal, WB, RWA */
} else {
memattr = 0xff; /* Normal, WB, RWA */
}
} else if (access_type == MMU_INST_FETCH) {
if (regime_sctlr(env, mmu_idx) & SCTLR_I) {
memattr = 0xee; /* Normal, WT, RA, NT */
} else {
memattr = 0x44; /* Normal, NC, No */
}
cacheattrs->shareability = 2; /* outer sharable */
} else {
memattr = 0x00; /* Device, nGnRnE */
}
cacheattrs->attrs = memattr;
return 0;
}

5
target/arm/tlb_helper.c
View File

@ -188,6 +188,11 @@ bool arm_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
phys_addr &= TARGET_PAGE_MASK;
address &= TARGET_PAGE_MASK;
}
/* Notice and record tagged memory. */
if (cpu_isar_feature(aa64_mte, cpu) && cacheattrs.attrs == 0xf0) {
arm_tlb_mte_tagged(&attrs) = true;
}
tlb_set_page_with_attrs(cs, address, phys_addr, attrs,
prot, mmu_idx, page_size);
return true;