[xen staging] xen/riscv: introduce trap_init()

[patchbot@xxxxxxx]

commit f2dc25686b6c90fc631525e4b9e6537154ee4b0b
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Thu Aug 1 09:42:54 2024 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 1 09:42:54 2024 +0200

    xen/riscv: introduce trap_init()
    
    Note that trap_init() isn't declared with the __init attribute to
    avoid removing __init when multi-CPU support for Xen is added.
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Reviewed-by: Alistair Francis <alistair.francis@xxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/include/asm/traps.h |  1 +
 xen/arch/riscv/setup.c             |  3 +++
 xen/arch/riscv/traps.c             | 12 ++++++++++++
 3 files changed, 16 insertions(+)

diff --git a/xen/arch/riscv/include/asm/traps.h 
b/xen/arch/riscv/include/asm/traps.h
index 3fef318478..c30118e095 100644
--- a/xen/arch/riscv/include/asm/traps.h
+++ b/xen/arch/riscv/include/asm/traps.h
@@ -9,6 +9,7 @@
 
 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 e3cb0866d5..a6a29a1508 100644
--- a/xen/arch/riscv/setup.c
+++ b/xen/arch/riscv/setup.c
@@ -8,6 +8,7 @@
 #include <public/version.h>
 
 #include <asm/early_printk.h>
+#include <asm/traps.h>
 
 void arch_get_xen_caps(xen_capabilities_info_t *info)
 {
@@ -23,6 +24,8 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
 {
     remove_identity_mapping();
 
+    trap_init();
+
     printk("All set up\n");
 
     for ( ;; )
diff --git a/xen/arch/riscv/traps.c b/xen/arch/riscv/traps.c
index 37cec40dfa..cb18b30ff2 100644
--- a/xen/arch/riscv/traps.c
+++ b/xen/arch/riscv/traps.c
@@ -12,6 +12,18 @@
 #include <asm/riscv_encoding.h>
 #include <asm/traps.h>
 
+/*
+ * Initialize the trap handling.
+ *
+ * The function is called after MMU is enabled.
+ */
+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[] = {
--
generated by git-patchbot for /home/xen/git/xen.git#staging