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target-arm: Implement AArch64 memory attribute registers

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Implement the AArch64 memory attribute registers. Since QEMU doesn't
model caches it does not need to care about memory attributes at all,
and we can simply make these read-as-written.

We did not previously implement the AArch32 versions of the MAIR
registers, which went unnoticed because of the overbroad TLB_LOCKDOWN
reginfo definition; provide them now to keep the 64<->32 register
relationship clear.

We already provided AMAIR registers for 32 bit as simple RAZ/WI;
extend that to provide a 64 bit RAZ/WI AMAIR_EL1.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Maydell 2014-02-26 17:20:03 +00:00
parent 91e240698f
commit b0fe242751
2 changed files with 26 additions and 1 deletions
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3
target-arm/cpu.h
View File

@ -74,8 +74,10 @@
*/
#ifdef HOST_WORDS_BIGENDIAN
#define offsetoflow32(S, M) (offsetof(S, M) + sizeof(uint32_t))
#define offsetofhigh32(S, M) offsetof(S, M)
#else
#define offsetoflow32(S, M) offsetof(S, M)
#define offsetofhigh32(S, M) (offsetof(S, M) + sizeof(uint32_t))
#endif
/* Meanings of the ARMCPU object's two inbound GPIO lines */
@ -197,6 +199,7 @@ typedef struct CPUARMState {
uint32_t c9_pmxevtyper; /* perf monitor event type */
uint32_t c9_pmuserenr; /* perf monitor user enable */
uint32_t c9_pminten; /* perf monitor interrupt enables */
uint64_t mair_el1;
uint32_t c12_vbar; /* vector base address register */
uint32_t c13_fcse; /* FCSE PID. */
uint32_t c13_context; /* Context ID. */

24
target-arm/helper.c
View File

@ -641,6 +641,26 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
*/
{ .name = "AIDR", .cp = 15, .crn = 0, .crm = 0, .opc1 = 1, .opc2 = 7,
.access = PL1_R, .type = ARM_CP_CONST, .resetvalue = 0 },
/* MAIR can just read-as-written because we don't implement caches
* and so don't need to care about memory attributes.
*/
{ .name = "MAIR_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 10, .crm = 2, .opc2 = 0,
.access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.mair_el1),
.resetvalue = 0 },
/* For non-long-descriptor page tables these are PRRR and NMRR;
* regardless they still act as reads-as-written for QEMU.
* The override is necessary because of the overly-broad TLB_LOCKDOWN
* definition.
*/
{ .name = "MAIR0", .state = ARM_CP_STATE_AA32, .type = ARM_CP_OVERRIDE,
.cp = 15, .opc1 = 0, .crn = 10, .crm = 2, .opc2 = 0, .access = PL1_RW,
.fieldoffset = offsetoflow32(CPUARMState, cp15.mair_el1),
.resetfn = arm_cp_reset_ignore },
{ .name = "MAIR1", .state = ARM_CP_STATE_AA32, .type = ARM_CP_OVERRIDE,
.cp = 15, .opc1 = 0, .crn = 10, .crm = 2, .opc2 = 1, .access = PL1_RW,
.fieldoffset = offsetofhigh32(CPUARMState, cp15.mair_el1),
.resetfn = arm_cp_reset_ignore },
REGINFO_SENTINEL
};
@ -1467,9 +1487,11 @@ static const ARMCPRegInfo lpae_cp_reginfo[] = {
/* NOP AMAIR0/1: the override is because these clash with the rather
* broadly specified TLB_LOCKDOWN entry in the generic cp_reginfo.
*/
{ .name = "AMAIR0", .cp = 15, .crn = 10, .crm = 3, .opc1 = 0, .opc2 = 0,
{ .name = "AMAIR0", .state = ARM_CP_STATE_BOTH,
.opc0 = 3, .crn = 10, .crm = 3, .opc1 = 0, .opc2 = 0,
.access = PL1_RW, .type = ARM_CP_CONST | ARM_CP_OVERRIDE,
.resetvalue = 0 },
/* AMAIR1 is mapped to AMAIR_EL1[63:32] */
{ .name = "AMAIR1", .cp = 15, .crn = 10, .crm = 3, .opc1 = 0, .opc2 = 1,
.access = PL1_RW, .type = ARM_CP_CONST | ARM_CP_OVERRIDE,
.resetvalue = 0 },