uint32_t vfp_get_fpscr(CPUARMState *env);
void vfp_set_fpscr(CPUARMState *env, uint32_t val);
+/* For A64 the FPSCR is split into two logically distinct registers,
+ * FPCR and FPSR. However since they still use non-overlapping bits
+ * we store the underlying state in fpscr and just mask on read/write.
+ */
+#define FPSR_MASK 0xf800009f
+#define FPCR_MASK 0x07f79f00
+static inline uint32_t vfp_get_fpsr(CPUARMState *env)
+{
+ return vfp_get_fpscr(env) & FPSR_MASK;
+}
+
+static inline void vfp_set_fpsr(CPUARMState *env, uint32_t val)
+{
+ uint32_t new_fpscr = (vfp_get_fpscr(env) & ~FPSR_MASK) | (val & FPSR_MASK);
+ vfp_set_fpscr(env, new_fpscr);
+}
+
+static inline uint32_t vfp_get_fpcr(CPUARMState *env)
+{
+ return vfp_get_fpscr(env) & FPCR_MASK;
+}
+
+static inline void vfp_set_fpcr(CPUARMState *env, uint32_t val)
+{
+ uint32_t new_fpscr = (vfp_get_fpscr(env) & ~FPCR_MASK) | (val & FPCR_MASK);
+ vfp_set_fpscr(env, new_fpscr);
+}
+
enum arm_cpu_mode {
ARM_CPU_MODE_USR = 0x10,
ARM_CPU_MODE_FIQ = 0x11,
* or via MRRC/MCRR?)
* We allow 4 bits for opc1 because MRRC/MCRR have a 4 bit field.
* (In this case crn and opc2 should be zero.)
+ * For AArch64, there is no 32/64 bit size distinction;
+ * instead all registers have a 2 bit op0, 3 bit op1 and op2,
+ * and 4 bit CRn and CRm. The encoding patterns are chosen
+ * to be easy to convert to and from the KVM encodings, and also
+ * so that the hashtable can contain both AArch32 and AArch64
+ * registers (to allow for interprocessing where we might run
+ * 32 bit code on a 64 bit core).
*/
+/* This bit is private to our hashtable cpreg; in KVM register
+ * IDs the AArch64/32 distinction is the KVM_REG_ARM/ARM64
+ * in the upper bits of the 64 bit ID.
+ */
+#define CP_REG_AA64_SHIFT 28
+#define CP_REG_AA64_MASK (1 << CP_REG_AA64_SHIFT)
+
#define ENCODE_CP_REG(cp, is64, crn, crm, opc1, opc2) \
(((cp) << 16) | ((is64) << 15) | ((crn) << 11) | \
((crm) << 7) | ((opc1) << 3) | (opc2))
+#define ENCODE_AA64_CP_REG(cp, crn, crm, op0, op1, op2) \
+ (CP_REG_AA64_MASK | \
+ ((cp) << CP_REG_ARM_COPROC_SHIFT) | \
+ ((op0) << CP_REG_ARM64_SYSREG_OP0_SHIFT) | \
+ ((op1) << CP_REG_ARM64_SYSREG_OP1_SHIFT) | \
+ ((crn) << CP_REG_ARM64_SYSREG_CRN_SHIFT) | \
+ ((crm) << CP_REG_ARM64_SYSREG_CRM_SHIFT) | \
+ ((op2) << CP_REG_ARM64_SYSREG_OP2_SHIFT))
+
/* Convert a full 64 bit KVM register ID to the truncated 32 bit
* version used as a key for the coprocessor register hashtable
*/
static inline uint32_t kvm_to_cpreg_id(uint64_t kvmid)
{
uint32_t cpregid = kvmid;
- if ((kvmid & CP_REG_SIZE_MASK) == CP_REG_SIZE_U64) {
+ if ((kvmid & CP_REG_ARCH_MASK) == CP_REG_ARM64) {
+ cpregid |= CP_REG_AA64_MASK;
+ } else if ((kvmid & CP_REG_SIZE_MASK) == CP_REG_SIZE_U64) {
cpregid |= (1 << 15);
}
return cpregid;
*/
static inline uint64_t cpreg_to_kvm_id(uint32_t cpregid)
{
- uint64_t kvmid = cpregid & ~(1 << 15);
- if (cpregid & (1 << 15)) {
- kvmid |= CP_REG_SIZE_U64 | CP_REG_ARM;
+ uint64_t kvmid;
+
+ if (cpregid & CP_REG_AA64_MASK) {
+ kvmid = cpregid & ~CP_REG_AA64_MASK;
+ kvmid |= CP_REG_SIZE_U64 | CP_REG_ARM64;
} else {
- kvmid |= CP_REG_SIZE_U32 | CP_REG_ARM;
+ kvmid = cpregid & ~(1 << 15);
+ if (cpregid & (1 << 15)) {
+ kvmid |= CP_REG_SIZE_U64 | CP_REG_ARM;
+ } else {
+ kvmid |= CP_REG_SIZE_U32 | CP_REG_ARM;
+ }
}
return kvmid;
}
/* Mask of only the flag bits in a type field */
#define ARM_CP_FLAG_MASK 0x7f
+/* Valid values for ARMCPRegInfo state field, indicating which of
+ * the AArch32 and AArch64 execution states this register is visible in.
+ * If the reginfo doesn't explicitly specify then it is AArch32 only.
+ * If the reginfo is declared to be visible in both states then a second
+ * reginfo is synthesised for the AArch32 view of the AArch64 register,
+ * such that the AArch32 view is the lower 32 bits of the AArch64 one.
+ * Note that we rely on the values of these enums as we iterate through
+ * the various states in some places.
+ */
+enum {
+ ARM_CP_STATE_AA32 = 0,
+ ARM_CP_STATE_AA64 = 1,
+ ARM_CP_STATE_BOTH = 2,
+};
+
/* Return true if cptype is a valid type field. This is used to try to
* catch errors where the sentinel has been accidentally left off the end
* of a list of registers.
* (ie anything visible in PL2 is visible in S-PL1, some things are only
* visible in S-PL1) but "Secure PL1" is a bit of a mouthful, we bend the
* terminology a little and call this PL3.
+ * In AArch64 things are somewhat simpler as the PLx bits line up exactly
+ * with the ELx exception levels.
*
* If access permissions for a register are more complex than can be
* described with these bits, then use a laxer set of restrictions, and
static inline int arm_current_pl(CPUARMState *env)
{
+ if (env->aarch64) {
+ return extract32(env->pstate, 2, 2);
+ }
+
if ((env->uncached_cpsr & 0x1f) == ARM_CPU_MODE_USR) {
return 0;
}
* then behave differently on read/write if necessary.
* For 64 bit registers, only crm and opc1 are relevant; crn and opc2
* must both be zero.
+ * For AArch64-visible registers, opc0 is also used.
+ * Since there are no "coprocessors" in AArch64, cp is purely used as a
+ * way to distinguish (for KVM's benefit) guest-visible system registers
+ * from demuxed ones provided to preserve the "no side effects on
+ * KVM register read/write from QEMU" semantics. cp==0x13 is guest
+ * visible (to match KVM's encoding); cp==0 will be converted to
+ * cp==0x13 when the ARMCPRegInfo is registered, for convenience.
*/
uint8_t cp;
uint8_t crn;
uint8_t crm;
+ uint8_t opc0;
uint8_t opc1;
uint8_t opc2;
+ /* Execution state in which this register is visible: ARM_CP_STATE_* */
+ int state;
/* Register type: ARM_CP_* bits/values */
int type;
/* Access rights: PL*_[RW] */
{
define_one_arm_cp_reg_with_opaque(cpu, regs, 0);
}
-const ARMCPRegInfo *get_arm_cp_reginfo(ARMCPU *cpu, uint32_t encoded_cp);
+const ARMCPRegInfo *get_arm_cp_reginfo(GHashTable *cpregs, uint32_t encoded_cp);
/* CPWriteFn that can be used to implement writes-ignored behaviour */
int arm_cp_write_ignore(CPUARMState *env, const ARMCPRegInfo *ri,
/* CPReadFn that can be used for read-as-zero behaviour */
int arm_cp_read_zero(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t *value);
-static inline bool cp_access_ok(CPUARMState *env,
+/* CPResetFn that does nothing, for use if no reset is required even
+ * if fieldoffset is non zero.
+ */
+void arm_cp_reset_ignore(CPUARMState *env, const ARMCPRegInfo *opaque);
+
+static inline bool cp_access_ok(int current_pl,
const ARMCPRegInfo *ri, int isread)
{
- return (ri->access >> ((arm_current_pl(env) * 2) + isread)) & 1;
+ return (ri->access >> ((current_pl * 2) + isread)) & 1;
}
/**
projects / qemu.git / blobdiff