Features/QOM/CPU

Summary

Convert CPUState to QOM.

Motivation

1. Short-term: Allow inspecting and modifying CPU properties via QOM.
2. Short-term: Avoid common target code doing ifs or switches on CPU identifiers.
   • target-arm/helper.c: cpu_reset_model_id()
3. Short-term: Replace CPU_COMMON macro and duplicated reset code by inheritance.
4. Mid-term: Avoid dependency of common code on #defines from cpu.h.
5. Mid-term: Ease instantiation of mixed software-visible cores within one target, e.g.
   • NXP LPC43xx: Cortex-M4 + Cortex-M0
   • ARM big.LITTLE: Cortex-A15 + Cortex-A7
   • Freescale Vybrid VF6xx/VF7xx: Cortex-A5 + Cortex-M4
6. Long-term: Work towards allowing to compile multiple targets into one executable.
   • Renesas R-Car H1, M1A: ARM Cortex-A9 + SH-4A
   • Renesas R-Home S1: ARM Cortex-A9 + SH-4A + ARM7TDMI-S

"CPU" name conflict

Identifier	current	interim	final
struct CPU$archState or struct CPUState_$arch	defined in target-*/cpu.h		???
#define CPUState	alias to CPU$archState / CPUState_$arch		dropped in favor of CPU
struct CPUClass		class
#define CPU_CLASS(class)		cast macro for class
struct CPU		object
#define CPU(obj)		cast macro for object
#define CPU_GET_CLASS(obj)		macro to obtain class pointer

Resolved by renaming existing CPUState to CPUArchState and by using struct CPUState for the object state, while using CPU(obj) as macro for casting.

Owner

• Name: Andreas Färber
• Email: afaerber@suse.de

Status

QOM CPUState exists, former CPUState is renamed to CPUArchState. All targets have been converted for v1.1-rc0.

Field movements from CPUArchState to CPUState (and subsequent removal of CPUArchState and CPU_COMMON) are being worked on.

Patch series and branches

NB: Due to hosting issues, branches have moved to GitHub.

name	depends on
type_init()
qom-user	type_init()
object_class_get_list()
qom-cpu	qom-user
qom-cpu-arm	qom-cpu
qom-cpu-unicore32	qom-cpu
qom-cpu-s390	qom-cpu
qom-cpu-x86, part 1	qom-cpu
qom-cpu-sparc	qom-cpu, qom-cpu-s390
qom-cpu-ppc	qom-cpu
qom-cpu-alpha	qom-cpu, qom-cpu-unicore32
qom-cpu-lm32	qom-cpu, qom-cpu-arm, qom-cpu-s390
qom-cpu-xtensa	qom-cpu, qom-cpu-unicore32, qom-cpu-alpha
qom-cpu-cris	qom-cpu, qom-cpu-arm, qom-cpu-s390, qom-cpu-lm32
qom-cpu-microblaze	qom-cpu, qom-cpu-arm, qom-cpu-s390, qom-cpu-lm32, qom-cpu-cris
qom-cpu-sh4, part 1	qom-cpu, qom-cpu-s390, qom-cpu-sparc, qom-cpu-lm32, qom-cpu-microblaze
qom-cpu-m68k	qom-cpu, object_class_get_list(), qom-cpu-arm, qom-cpu-s390, qom-cpu-lm32, qom-cpu-cris, qom-cpu-microblaze, qom-cpu-sh4
qom-cpu-mips	qom-cpu, qom-cpu-s390, qom-cpu-lm32, qom-cpu-microblaze, qom-cpu-sh4, qom-cpu-m68k
qom-cpu, part 2 (cleanup)	qom-cpu-arm, qom-cpu-unicore32, qom-cpu-s390, qom-cpu-x86, qom-cpu-sparc, qom-cpu-ppc, qom-cpu-alpha, qom-cpu-lm32, qom-cpu-xtensa, qom-cpu-cris, qom-cpu-microblaze, qom-cpu-sh4, qom-cpu-m68k, qom-cpu-mips
qom-cpu-x86, part 2 (props)
qom-1.1
qom-cpu-1.1 (cleanups)
qom-next
qom-cpu, part 3 (reset)	qom-cpu-1.1
qom-cpu-x86, part 3 (classes)
qom-cpu-sh4, part 2
qom-cpu-unicore32, part 2
qom-cpu-alpha, part 2