From: "Aurelio C. Remonda" <aurelioremonda@gmail.com>
To: qemu-devel@nongnu.org, ilg@livius.net, peter.maydell@linaro.org,
martin.galvan@tallertechnologies.com,
daniel.gutson@tallertechnologies.com
Subject: [Qemu-devel] [PATCH V4] Target-arm: Add the Cortex-M4 CPU
Date: Tue, 16 Jun 2015 10:37:30 -0300 [thread overview]
Message-ID: <1434461850-4104-1-git-send-email-aurelioremonda@gmail.com> (raw)
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. The THUMB_DSP feature was created in a different patch
along with the bit checking on each DSP instruction. Only no-FPU cortex-M4 is
implemented here, cortex-M4F is not because the core target-arm code doesn't
support the M-profile FPU model yet.
Signed-off-by: Aurelio C. Remonda <aurelioremonda@gmail.com>
---
* Changes in V4: Commit message updated. Deleted unnecessary comment and
added a blank line in cortex-M4 initfn.
target-arm/cpu.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 4a888ab..d25a500 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -783,6 +783,15 @@ 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; /* r0p0 */
+}
static void arm_v7m_class_init(ObjectClass *oc, void *data)
{
CPUClass *cc = CPU_CLASS(oc);
@@ -1185,6 +1194,8 @@ 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
next reply other threads:[~2015-06-16 13:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-16 13:37 Aurelio C. Remonda [this message]
2015-06-16 14:20 ` [Qemu-devel] [PATCH V4] Target-arm: Add the Cortex-M4 CPU Peter Maydell
2015-06-16 14:35 ` aurelio remonda
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