diff mbox series

[01/23] Add CPU initialization function

Message ID 20240617185804.25075-2-itachis@FreeBSD.org (mailing list archive)
State New
Headers show
Series ARM AArch64 Support for BSD | expand

Commit Message

Ajeet Singh June 17, 2024, 6:57 p.m. UTC
From: Stacey Son <sson@FreeBSD.org>

Addded function to initialize ARM CPU
and to check if it supports 64 bit mode

Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Signed-off-by: Stacey Son <sson@FreeBSD.org>
---
 bsd-user/aarch64/target_arch_cpu.h | 42 ++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 bsd-user/aarch64/target_arch_cpu.h

Comments

Richard Henderson June 18, 2024, 4:17 a.m. UTC | #1
On 6/17/24 11:57, Ajeet Singh wrote:
> From: Stacey Son <sson@FreeBSD.org>
> 
> Addded function to initialize ARM CPU
> and to check if it supports 64 bit mode
> 
> Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
> Signed-off-by: Stacey Son <sson@FreeBSD.org>
> ---
>   bsd-user/aarch64/target_arch_cpu.h | 42 ++++++++++++++++++++++++++++++
>   1 file changed, 42 insertions(+)
>   create mode 100644 bsd-user/aarch64/target_arch_cpu.h
> 
> diff --git a/bsd-user/aarch64/target_arch_cpu.h b/bsd-user/aarch64/target_arch_cpu.h
> new file mode 100644
> index 0000000000..db5c7062b9
> --- /dev/null
> +++ b/bsd-user/aarch64/target_arch_cpu.h
> @@ -0,0 +1,42 @@
> +/*
> + *  ARM AArch64 cpu init and loop
> + *
> + * Copyright (c) 2015 Stacey Son
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef TARGET_ARCH_CPU_H
> +#define TARGET_ARCH_CPU_H
> +
> +#include "target_arch.h"
> +#include "target/arm/syndrome.h"

Do you actually need syndrome.h?

Otherwise,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

> +
> +#define TARGET_DEFAULT_CPU_MODEL "any"
> +
> +static inline void target_cpu_init(CPUARMState *env,
> +    struct target_pt_regs *regs)
> +{
> +    int i;
> +
> +    if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
> +        fprintf(stderr, "The selected ARM CPU does not support 64 bit mode\n");
> +        exit(1);
> +    }
> +    for (i = 0; i < 31; i++) {
> +        env->xregs[i] = regs->regs[i];
> +    }
> +    env->pc = regs->pc;
> +    env->xregs[31] = regs->sp;
> +}
Warner Losh June 22, 2024, 6:37 p.m. UTC | #2
On Mon, Jun 17, 2024 at 10:17 PM Richard Henderson <
richard.henderson@linaro.org> wrote:

> On 6/17/24 11:57, Ajeet Singh wrote:
> > From: Stacey Son <sson@FreeBSD.org>
> >
> > Addded function to initialize ARM CPU
> > and to check if it supports 64 bit mode
> >
> > Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
> > Signed-off-by: Stacey Son <sson@FreeBSD.org>
> > ---
> >   bsd-user/aarch64/target_arch_cpu.h | 42 ++++++++++++++++++++++++++++++
> >   1 file changed, 42 insertions(+)
> >   create mode 100644 bsd-user/aarch64/target_arch_cpu.h
> >
> > diff --git a/bsd-user/aarch64/target_arch_cpu.h
> b/bsd-user/aarch64/target_arch_cpu.h
> > new file mode 100644
> > index 0000000000..db5c7062b9
> > --- /dev/null
> > +++ b/bsd-user/aarch64/target_arch_cpu.h
> > @@ -0,0 +1,42 @@
> > +/*
> > + *  ARM AArch64 cpu init and loop
> > + *
> > + * Copyright (c) 2015 Stacey Son
> > + *
> > + * This library is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU Lesser General Public
> > + * License as published by the Free Software Foundation; either
> > + * version 2 of the License, or (at your option) any later version.
> > + *
> > + * This library is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * Lesser General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU Lesser General Public
> > + * License along with this library; if not, see <
> http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef TARGET_ARCH_CPU_H
> > +#define TARGET_ARCH_CPU_H
> > +
> > +#include "target_arch.h"
> > +#include "target/arm/syndrome.h"
>
> Do you actually need syndrome.h?
>

It's needed, but not for this chunk. It is needed for patch 2 because we
start to use the syndrome functions there to dispatch / decode the traps.
So that should be moved to patch 2 in the next round, I think.

Also

Reviewed-by: Warner Losh <imp@bsdimp.com>

since this looks correct and I didn't write it :)

Warner


> Otherwise,
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
>
> r~
>
> > +
> > +#define TARGET_DEFAULT_CPU_MODEL "any"
> > +
> > +static inline void target_cpu_init(CPUARMState *env,
> > +    struct target_pt_regs *regs)
> > +{
> > +    int i;
> > +
> > +    if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
> > +        fprintf(stderr, "The selected ARM CPU does not support 64 bit
> mode\n");
> > +        exit(1);
> > +    }
> > +    for (i = 0; i < 31; i++) {
> > +        env->xregs[i] = regs->regs[i];
> > +    }
> > +    env->pc = regs->pc;
> > +    env->xregs[31] = regs->sp;
> > +}
>
>
diff mbox series

Patch

diff --git a/bsd-user/aarch64/target_arch_cpu.h b/bsd-user/aarch64/target_arch_cpu.h
new file mode 100644
index 0000000000..db5c7062b9
--- /dev/null
+++ b/bsd-user/aarch64/target_arch_cpu.h
@@ -0,0 +1,42 @@ 
+/*
+ *  ARM AArch64 cpu init and loop
+ *
+ * Copyright (c) 2015 Stacey Son
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TARGET_ARCH_CPU_H
+#define TARGET_ARCH_CPU_H
+
+#include "target_arch.h"
+#include "target/arm/syndrome.h"
+
+#define TARGET_DEFAULT_CPU_MODEL "any"
+
+static inline void target_cpu_init(CPUARMState *env,
+    struct target_pt_regs *regs)
+{
+    int i;
+
+    if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
+        fprintf(stderr, "The selected ARM CPU does not support 64 bit mode\n");
+        exit(1);
+    }
+    for (i = 0; i < 31; i++) {
+        env->xregs[i] = regs->regs[i];
+    }
+    env->pc = regs->pc;
+    env->xregs[31] = regs->sp;
+}