[PATCH v5 04/18] arm/cpu: Add infra to handle generated ID register definitions

[Eric Auger <eric.auger@redhat.com>]

The known ID regs are populated in a new initialization function
named initialize_cpu_sysreg_properties(). That code will be
automatically generated from AARCHMRS Registers.json. For the
time being let's just describe a single id reg, CTR_EL0. In this
description we only care about non RES/RAZ fields, ie. named fields.

The registers are populated in an array indexed by ARMIDRegisterIdx
and their fields are added in a sorted list.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

---

v4 -> v5
- ifdef TARGET_ARM_CPU_IDREGS_H
- s/g_list_append/g_list_prepend
- void arm64_sysreg_add_field()
---
 target/arm/cpu-idregs.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 target/arm/cpu-idregs.h

diff --git a/target/arm/cpu-idregs.h b/target/arm/cpu-idregs.h
new file mode 100644
index 0000000000..664e2d6ddd
--- /dev/null
+++ b/target/arm/cpu-idregs.h
@@ -0,0 +1,33 @@
+/*
+ * handle ID registers and their fields
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef TARGET_ARM_CPU_IDREGS_H
+#define TARGET_ARM_CPU_IDREGS_H
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "cpu.h"
+#include "cpu-sysregs.h"
+
+typedef struct ARM64SysRegField {
+    const char *name; /* name of the field, for instance CTR_EL0_IDC */
+    ARMIDRegisterIdx index; /* parent register, e.g. CTR_EL0_IDX */
+    int shift; /* lsb of the field in the register */
+    int length; /* highest bit number */
+} ARM64SysRegField;
+
+typedef struct ARM64SysReg {
+    const char *name;   /* name of the sysreg, for instance CTR_EL0 */
+    ARMIDRegisterIdx index; /* register index, e.g. CTR_EL0_IDX */
+    struct ARM64SysRegField *fields;
+    uint32_t fields_count;
+} ARM64SysReg;
+
+/*
+ * List of exposed ID regs (automatically populated from AARCHMRS Registers.json)
+ */
+extern ARM64SysReg arm64_id_regs[NUM_ID_IDX];
+
+#endif
-- 
2.53.0