Features/QOM/CPU: Difference between revisions
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== QOM CPU == | == QOM CPU == | ||
Convert CPUState to QOM. | |||
=== Motivation === | |||
# Short-term: Allow inspecting and modifying CPU properties via QOM. | |||
# Short-term: Avoid common target code doing ifs or switches on CPU identifiers. | |||
#* target-arm/helper.c: cpu_reset_model_id() | |||
# Short-term: Replace CPU_COMMON macro and duplicated reset code by inheritance. | |||
# Mid-term: Avoid dependency of common code on #defines from cpu.h. | |||
# 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/VFP7xx: Cortex-A5 + Cortex-M4 | |||
# 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 === | === "CPU" name conflict === | ||
Revision as of 12:13, 6 April 2012
QOM CPU
Convert CPUState to QOM.
Motivation
- Short-term: Allow inspecting and modifying CPU properties via QOM.
- Short-term: Avoid common target code doing ifs or switches on CPU identifiers.
- target-arm/helper.c: cpu_reset_model_id()
- Short-term: Replace CPU_COMMON macro and duplicated reset code by inheritance.
- Mid-term: Avoid dependency of common code on #defines from cpu.h.
- 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/VFP7xx: Cortex-A5 + Cortex-M4
- 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.
Status
NB: Due to hosting issues, branches have moved to GitHub.
| name | depends on |
|---|---|
| type_init() | |
| qom-user | |
| qom-cpu | |
| qom-cpu | |
| qom-cpu | |
| qom-cpu-x86, part 1 | qom-cpu |
| qom-cpu-sparc | qom-cpu |
| qom-cpu-sh4 (to be updated) | qom-cpu, object_realize() |
| qom-cpu-others (to be split up) | qom-cpu |