[v2,11/14] xen/riscv: introduce trap_init()

Commit Message

Oleksii Kurochko Jan. 27, 2023, 1:59 p.m. UTC

Signed-off-by: Oleksii Kurochko <[e-mail]>
Reviewed-by: Alistair Francis <[e-mail]>
---
Changes in V2:
  - Rename setup_trap_handler() to trap_init().
  - Add Reviewed-by to the commit message.
---
 xen/arch/riscv/include/asm/traps.h | 1 +
 xen/arch/riscv/setup.c             | 4 ++++
 xen/arch/riscv/traps.c             | 7 +++++++
 3 files changed, 12 insertions(+)

Patch

diff --git a/xen/arch/riscv/include/asm/traps.h b/xen/arch/riscv/include/asm/traps.h
index f3fb6b25d1..f1879294ef 100644
--- a/xen/arch/riscv/include/asm/traps.h
+++ b/xen/arch/riscv/include/asm/traps.h
@@ -7,6 +7,7 @@ 
 
 void do_trap(struct cpu_user_regs *cpu_regs);
 void handle_trap(void);
+void trap_init(void);
 
 #endif /* __ASSEMBLY__ */
 
diff --git a/xen/arch/riscv/setup.c b/xen/arch/riscv/setup.c
index d09ffe1454..c8513ca4f8 100644
--- a/xen/arch/riscv/setup.c
+++ b/xen/arch/riscv/setup.c
@@ -1,7 +1,9 @@ 
 #include <xen/compile.h>
 #include <xen/init.h>
 
+#include <asm/csr.h>
 #include <asm/early_printk.h>
+#include <asm/traps.h>
 
 /* Xen stack for bringing up the first CPU. */
 unsigned char __initdata cpu0_boot_stack[STACK_SIZE]
@@ -11,6 +13,8 @@  void __init noreturn start_xen(void)
 {
     early_printk("Hello from C env\n");
 
+    trap_init();
+
     for ( ;; )
         asm volatile ("wfi");
 
diff --git a/xen/arch/riscv/traps.c b/xen/arch/riscv/traps.c
index f2a1e1ffcf..31ed63e3c1 100644
--- a/xen/arch/riscv/traps.c
+++ b/xen/arch/riscv/traps.c
@@ -11,6 +11,13 @@ 
 #include <xen/errno.h>
 #include <xen/lib.h>
 
+void trap_init(void)
+{
+    unsigned long addr = (unsigned long)&handle_trap;
+
+    csr_write(CSR_STVEC, addr);
+}
+
 static const char *decode_trap_cause(unsigned long cause)
 {
     static const char *const trap_causes[] = {