From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42866) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fP7J6-0001H5-65 for qemu-devel@nongnu.org; Sat, 02 Jun 2018 10:15:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fP7J5-0007Du-Ap for qemu-devel@nongnu.org; Sat, 02 Jun 2018 10:15:00 -0400 From: Stefan Hajnoczi Date: Sat, 2 Jun 2018 15:14:45 +0100 Message-Id: <20180602141446.29982-2-stefanha@redhat.com> In-Reply-To: <20180602141446.29982-1-stefanha@redhat.com> References: <20180602141446.29982-1-stefanha@redhat.com> Subject: [Qemu-devel] [RFC 1/2] target/arm: add "cortex-m0" CPU model List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , mail@steffen-goertz.de, jim@groklearning.com, qemu-arm@nongnu.org, jusual@mail.ru, joel@jms.id.au, Stefan Hajnoczi Define a "cortex-m0" ARMv6-M CPU model. Most of the register reset values set by other CPU models are not relevant for the cut-down ARMv6-M architecture. Signed-off-by: Stefan Hajnoczi --- target/arm/cpu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 5d60893a07..aac224d809 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -1215,6 +1215,16 @@ static void arm11mpcore_initfn(Object *obj) cpu->reset_auxcr = 1; } +static void cortex_m0_initfn(Object *obj) +{ + ARMCPU *cpu = ARM_CPU(obj); + set_feature(&cpu->env, ARM_FEATURE_V6); + set_feature(&cpu->env, ARM_FEATURE_M); + + /* TODO ARMv6-M doesn't support coprocessors, so how is this value accessed? */ + cpu->midr = 0x410cc200; +} + static void cortex_m3_initfn(Object *obj) { ARMCPU *cpu = ARM_CPU(obj); @@ -1796,6 +1806,8 @@ static const ARMCPUInfo arm_cpus[] = { { .name = "arm1136", .initfn = arm1136_initfn }, { .name = "arm1176", .initfn = arm1176_initfn }, { .name = "arm11mpcore", .initfn = arm11mpcore_initfn }, + { .name = "cortex-m0", .initfn = cortex_m0_initfn, + .class_init = arm_v7m_class_init /* TODO rename? */ }, { .name = "cortex-m3", .initfn = cortex_m3_initfn, .class_init = arm_v7m_class_init }, { .name = "cortex-m4", .initfn = cortex_m4_initfn, -- 2.17.0