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[Qemu-devel] [PATCH V3] Target-arm: Add the Cortex-M4 CPU
From: |
Aurelio C. Remonda |
Subject: |
[Qemu-devel] [PATCH V3] Target-arm: Add the Cortex-M4 CPU |
Date: |
Mon, 15 Jun 2015 17:31:00 -0300 |
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 <address@hidden>
---
* 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
- [Qemu-devel] [PATCH V3] Target-arm: Add the Cortex-M4 CPU,
Aurelio C. Remonda <=