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target/arm: Implement FEAT_LPA 

This feature widens physical addresses (and intermediate physical
addresses for 2-stage translation) from 48 to 52 bits, when using
64k pages.  The only thing left at this point is to handle the
extra bits in the TTBR and in the table descriptors.

Note that PAR_EL1 and HPFAR_EL2 are nominally extended, but we don't
mask out the high bits when writing to those registers, so no changes
are required there.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220301215958.157011-11-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-03-01 11:59:50 -10:00 committed by Peter Maydell
parent 0af312b6ed
commit 7a928f43d8
4 changed files with 19 additions and 5 deletions
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1
docs/system/arm/emulation.rst
View File

@ -24,6 +24,7 @@ the following architecture extensions:
- FEAT_I8MM (AArch64 Int8 matrix multiplication instructions)
- FEAT_JSCVT (JavaScript conversion instructions)
- FEAT_LOR (Limited ordering regions)
- FEAT_LPA (Large Physical Address space)
- FEAT_LRCPC (Load-acquire RCpc instructions)
- FEAT_LRCPC2 (Load-acquire RCpc instructions v2)
- FEAT_LSE (Large System Extensions)

2
target/arm/cpu-param.h
View File

@ -10,7 +10,7 @@
#ifdef TARGET_AARCH64
# define TARGET_LONG_BITS 64
# define TARGET_PHYS_ADDR_SPACE_BITS 48
# define TARGET_PHYS_ADDR_SPACE_BITS 52
# define TARGET_VIRT_ADDR_SPACE_BITS 52
#else
# define TARGET_LONG_BITS 32

2
target/arm/cpu64.c
View File

@ -795,7 +795,7 @@ static void aarch64_max_initfn(Object *obj)
cpu->isar.id_aa64pfr1 = t;
t = cpu->isar.id_aa64mmfr0;
t = FIELD_DP64(t, ID_AA64MMFR0, PARANGE, 5); /* PARange: 48 bits */
t = FIELD_DP64(t, ID_AA64MMFR0, PARANGE, 6); /* FEAT_LPA: 52 bits */
cpu->isar.id_aa64mmfr0 = t;
t = cpu->isar.id_aa64mmfr1;

19
target/arm/helper.c
View File

@ -11173,6 +11173,7 @@ static const uint8_t pamax_map[] = {
[3] = 42,
[4] = 44,
[5] = 48,
[6] = 52,
};
/* The cpu-specific constant value of PAMax; also used by hw/arm/virt. */
@ -11564,11 +11565,15 @@ static bool get_phys_addr_lpae(CPUARMState *env, uint64_t address,
descaddr = extract64(ttbr, 0, 48);
/*
* If the base address is out of range, raise AddressSizeFault.
* For FEAT_LPA and PS=6, bits [51:48] of descaddr are in [5:2] of TTBR.
*
* Otherwise, if the base address is out of range, raise AddressSizeFault.
* In the pseudocode, this is !IsZero(baseregister<47:outputsize>),
* but we've just cleared the bits above 47, so simplify the test.
*/
if (descaddr >> outputsize) {
if (outputsize > 48) {
descaddr |= extract64(ttbr, 2, 4) << 48;
} else if (descaddr >> outputsize) {
level = 0;
fault_type = ARMFault_AddressSize;
goto do_fault;
@ -11620,7 +11625,15 @@ static bool get_phys_addr_lpae(CPUARMState *env, uint64_t address,
}
descaddr = descriptor & descaddrmask;
if (descaddr >> outputsize) {
/*
* For FEAT_LPA and PS=6, bits [51:48] of descaddr are in [15:12]
* of descriptor. Otherwise, if descaddr is out of range, raise
* AddressSizeFault.
*/
if (outputsize > 48) {
descaddr |= extract64(descriptor, 12, 4) << 48;
} else if (descaddr >> outputsize) {
fault_type = ARMFault_AddressSize;
goto do_fault;
}