This patch adds the Cortex-M4 CPU. The M4 is basically the same as the M3, the main differences being the DSP instructions and an optional FPU. Created an ARM_FEATURE_THUMB_DSP to be added to any non-M thumb2-compatible CPU that uses DSP instructions, and manually added it to the M4 in its initfn.
Signed-off-by: Aurelio C. Remonda <aurelioremo...@gmail.com> --- * Changes in V3: Add the ARM_FEATURE_THUMB_DSP in a separate patch and create just the CPU init on this one. target-arm/cpu.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/target-arm/cpu.c b/target-arm/cpu.c index 4a888ab..4950897 100644 --- a/target-arm/cpu.c +++ b/target-arm/cpu.c @@ -783,6 +783,21 @@ static void cortex_m3_initfn(Object *obj) cpu->midr = 0x410fc231; } +static void cortex_m4_initfn(Object *obj) +{ + ARMCPU *cpu = ARM_CPU(obj); + set_feature(&cpu->env, ARM_FEATURE_V7); + set_feature(&cpu->env, ARM_FEATURE_M); + set_feature(&cpu->env, ARM_FEATURE_THUMB_DSP); + cpu->midr = 0x410fc240; + /*main id register CPUID bit assignments + Bits NAME Function + [31:24] IMPLEMENTER Indicates implementor: 0x41 = ARM + [23:20] VARIANT Indicates processor revision: 0x0 = Revision 0 + [19:16] (Constant) Reads as 0xF + [15:4] PARTNO Indicates part number: 0xC24 = Cortex-M4 + [3:0] REVISION Indicates patch release: 0x0 = Patch 0.*/ +} static void arm_v7m_class_init(ObjectClass *oc, void *data) { CPUClass *cc = CPU_CLASS(oc); @@ -1185,6 +1200,8 @@ static const ARMCPUInfo arm_cpus[] = { { .name = "arm11mpcore", .initfn = arm11mpcore_initfn }, { .name = "cortex-m3", .initfn = cortex_m3_initfn, .class_init = arm_v7m_class_init }, + { .name = "cortex-m4", .initfn = cortex_m4_initfn, + .class_init = arm_v7m_class_init }, { .name = "cortex-a8", .initfn = cortex_a8_initfn }, { .name = "cortex-a9", .initfn = cortex_a9_initfn }, { .name = "cortex-a15", .initfn = cortex_a15_initfn }, -- 1.9.1