[PATCH linux-evl v2 1/2] riscv: Add EVL core

Signed-off-by: Tobias Schaffner <[email protected]>
---
 arch/riscv/Kconfig                        |  2 ++
 arch/riscv/include/asm/evl/calibration.h  | 12 +++++++++++
 arch/riscv/include/asm/evl/fptest.h       | 24 ++++++++++++++++++++++
 arch/riscv/include/asm/evl/syscall.h      | 25 +++++++++++++++++++++++
 arch/riscv/include/asm/evl/thread.h       | 12 +++++++++++
 arch/riscv/include/dovetail/irq.h         | 11 ++++++++++
 arch/riscv/include/dovetail/mm_info.h     | 11 ++++++++++
 arch/riscv/include/dovetail/net.h         | 11 ++++++++++
 arch/riscv/include/dovetail/netdevice.h   | 11 ++++++++++
 arch/riscv/include/dovetail/poll.h        | 11 ++++++++++
 arch/riscv/include/dovetail/skbuff.h      | 11 ++++++++++
 arch/riscv/include/dovetail/thread_info.h | 11 ++++++++++
 arch/riscv/include/uapi/asm/evl/fptest.h  | 17 +++++++++++++++
 13 files changed, 169 insertions(+)
 create mode 100644 arch/riscv/include/asm/evl/calibration.h
 create mode 100644 arch/riscv/include/asm/evl/fptest.h
 create mode 100644 arch/riscv/include/asm/evl/syscall.h
 create mode 100644 arch/riscv/include/asm/evl/thread.h
 create mode 100644 arch/riscv/include/dovetail/irq.h
 create mode 100644 arch/riscv/include/dovetail/mm_info.h
 create mode 100644 arch/riscv/include/dovetail/net.h
 create mode 100644 arch/riscv/include/dovetail/netdevice.h
 create mode 100644 arch/riscv/include/dovetail/poll.h
 create mode 100644 arch/riscv/include/dovetail/skbuff.h
 create mode 100644 arch/riscv/include/dovetail/thread_info.h
 create mode 100644 arch/riscv/include/uapi/asm/evl/fptest.h

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 70ea8457e1f6..193b14fd4b17 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -152,6 +152,7 @@ config RISCV
 	select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
 	select HAVE_IRQ_PIPELINE
 	select HAVE_DOVETAIL
+	select HAVE_ARCH_EVL
 	select HAVE_ASM_MODVERSIONS
 	select HAVE_CONTEXT_TRACKING_USER
 	select HAVE_DEBUG_KMEMLEAK
@@ -381,6 +382,7 @@ config AS_HAS_OPTION_ARCH
 source "arch/riscv/Kconfig.socs"
 source "arch/riscv/Kconfig.errata"
 source "kernel/Kconfig.dovetail"
+source "kernel/Kconfig.evl"
 
 menu "Platform type"
 
diff --git a/arch/riscv/include/asm/evl/calibration.h b/arch/riscv/include/asm/evl/calibration.h
new file mode 100644
index 000000000000..4da81f33ce3c
--- /dev/null
+++ b/arch/riscv/include/asm/evl/calibration.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_RISCV_ASM_CALIBRATION_H
+#define _EVL_RISCV_ASM_CALIBRATION_H
+
+#include <linux/kconfig.h>
+
+static inline unsigned int evl_get_default_clock_gravity(void)
+{
+	return IS_ENABLED(CONFIG_SMP) ? 6000 : 3000;
+}
+
+#endif /* !_EVL_RISCV_ASM_CALIBRATION_H */
diff --git a/arch/riscv/include/asm/evl/fptest.h b/arch/riscv/include/asm/evl/fptest.h
new file mode 100644
index 000000000000..987246edac69
--- /dev/null
+++ b/arch/riscv/include/asm/evl/fptest.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_RISCV_ASM_FPTEST_H
+#define _EVL_RISCV_ASM_FPTEST_H
+
+#include <linux/cpufeature.h>
+#include <uapi/asm/evl/fptest.h>
+
+static inline bool evl_begin_fpu(void)
+{
+	return false;
+}
+
+static inline void evl_end_fpu(void) { }
+
+static inline u32 evl_detect_fpu(void)
+{
+	u32 features = 0;
+
+	/* TODO: Check if we have any FPU features. Not using any for now. */
+
+	return features;
+}
+
+#endif /* _EVL_RISCV_ASM_FPTEST_H */
diff --git a/arch/riscv/include/asm/evl/syscall.h b/arch/riscv/include/asm/evl/syscall.h
new file mode 100644
index 000000000000..1ef2d008934f
--- /dev/null
+++ b/arch/riscv/include/asm/evl/syscall.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _EVL_RISC_ASM_SYSCALL_H
+#define _EVL_RISC_ASM_SYSCALL_H
+
+#include <linux/uaccess.h>
+#include <asm/unistd.h>
+#include <asm/ptrace.h>
+#include <asm/syscall.h>
+#include <uapi/asm-generic/dovetail.h>
+
+#define raw_put_user(src, dst)  __put_user(src, dst)
+#define raw_get_user(dst, src)  __get_user(dst, src)
+
+static inline bool
+is_valid_inband_syscall(unsigned int nr)
+{
+	return nr < NR_syscalls;
+}
+
+static inline bool is_compat_oob_call(void)
+{
+	return false;
+}
+
+#endif /* !_EVL_RISC_ASM_SYSCALL_H */
diff --git a/arch/riscv/include/asm/evl/thread.h b/arch/riscv/include/asm/evl/thread.h
new file mode 100644
index 000000000000..70a07d5bfdbb
--- /dev/null
+++ b/arch/riscv/include/asm/evl/thread.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_RISCV_ASM_THREAD_H
+#define _EVL_RISCV_ASM_THREAD_H
+
+#include <asm/csr.h>
+
+static inline bool evl_is_breakpoint(int trapnr)
+{
+	return trapnr == EXC_BREAKPOINT;
+}
+
+#endif /* !_EVL_RISCV_ASM_THREAD_H */
diff --git a/arch/riscv/include/dovetail/irq.h b/arch/riscv/include/dovetail/irq.h
new file mode 100644
index 000000000000..f214e2f6ee2b
--- /dev/null
+++ b/arch/riscv/include/dovetail/irq.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_IRQ_H
+#define _EVL_DOVETAIL_IRQ_H
+
+#ifdef CONFIG_EVL
+#include <asm-generic/evl/irq.h>
+#else
+#include_next <dovetail/irq.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_IRQ_H */
diff --git a/arch/riscv/include/dovetail/mm_info.h b/arch/riscv/include/dovetail/mm_info.h
new file mode 100644
index 000000000000..e38b97d1f50f
--- /dev/null
+++ b/arch/riscv/include/dovetail/mm_info.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_MM_INFO_H
+#define _EVL_DOVETAIL_MM_INFO_H
+
+#ifdef CONFIG_EVL
+#include <asm-generic/evl/mm_info.h>
+#else
+#include_next <dovetail/mm_info.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_MM_INFO_H */
diff --git a/arch/riscv/include/dovetail/net.h b/arch/riscv/include/dovetail/net.h
new file mode 100644
index 000000000000..34062fd4dd13
--- /dev/null
+++ b/arch/riscv/include/dovetail/net.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_NET_H
+#define _EVL_DOVETAIL_NET_H
+
+#ifdef CONFIG_NET_OOB
+#include <asm-generic/evl/net.h>
+#else
+#include_next <dovetail/net.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_NET_H */
diff --git a/arch/riscv/include/dovetail/netdevice.h b/arch/riscv/include/dovetail/netdevice.h
new file mode 100644
index 000000000000..ad3e7e99f1c0
--- /dev/null
+++ b/arch/riscv/include/dovetail/netdevice.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_NETDEVICE_H
+#define _EVL_DOVETAIL_NETDEVICE_H
+
+#ifdef CONFIG_NET_OOB
+#include <asm-generic/evl/netdevice.h>
+#else
+#include_next <dovetail/netdevice.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_NETDEVICE_H */
diff --git a/arch/riscv/include/dovetail/poll.h b/arch/riscv/include/dovetail/poll.h
new file mode 100644
index 000000000000..7196d625d0d9
--- /dev/null
+++ b/arch/riscv/include/dovetail/poll.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_POLL_H
+#define _EVL_DOVETAIL_POLL_H
+
+#ifdef CONFIG_EVL
+#include <asm-generic/evl/poll.h>
+#else
+#include_next <dovetail/poll.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_POLL_H */
diff --git a/arch/riscv/include/dovetail/skbuff.h b/arch/riscv/include/dovetail/skbuff.h
new file mode 100644
index 000000000000..c6ee9016a37a
--- /dev/null
+++ b/arch/riscv/include/dovetail/skbuff.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_SKBUFF_H
+#define _EVL_DOVETAIL_SKBUFF_H
+
+#ifdef CONFIG_NET_OOB
+#include <asm-generic/evl/skbuff.h>
+#else
+#include_next <dovetail/skbuff.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_SKBUFF_H */
diff --git a/arch/riscv/include/dovetail/thread_info.h b/arch/riscv/include/dovetail/thread_info.h
new file mode 100644
index 000000000000..bfef01471f0c
--- /dev/null
+++ b/arch/riscv/include/dovetail/thread_info.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _EVL_DOVETAIL_THREAD_INFO_H
+#define _EVL_DOVETAIL_THREAD_INFO_H
+
+#ifdef CONFIG_EVL
+#include <asm-generic/evl/thread_info.h>
+#else
+#include_next <dovetail/thread_info.h>
+#endif
+
+#endif /* !_EVL_DOVETAIL_THREAD_INFO_H */
diff --git a/arch/riscv/include/uapi/asm/evl/fptest.h b/arch/riscv/include/uapi/asm/evl/fptest.h
new file mode 100644
index 000000000000..9169fc5c1b50
--- /dev/null
+++ b/arch/riscv/include/uapi/asm/evl/fptest.h
@@ -0,0 +1,17 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2024 Tobias Schaffner <[email protected]>.
+ */
+#ifndef _EVL_RISCV_ASM_UAPI_FPTEST_H
+#define _EVL_RISCV_ASM_UAPI_FPTEST_H
+
+#include <linux/types.h>
+
+#define evl_riscv_fp  0x1
+
+/* TODO: Implement fptest */
+#define evl_set_fpregs(__features, __val)
+#define evl_check_fpregs(__features, __val, __bad) 0
+
+#endif /* !_EVL_RISCV_ASM_UAPI_FPTEST_H */
-- 
2.43.0