pussuw commented on code in PR #15081:
URL: https://github.com/apache/nuttx/pull/15081#discussion_r1877656774
##########
arch/risc-v/include/arch.h:
##########
@@ -108,6 +208,31 @@ typedef struct arch_addrenv_s arch_addrenv_t;
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_ARCH_ADDRENV */
+#ifndef __ASSEMBLY__
+
+/* Per CPU save area. Access to this structure can be gained via the scratch
+ * ([m/s]scratch) register. Prior to this, every CPU that
+ * wishes to access this information must call riscv_percpu_add_hart() which
+ * will set up [m/s]scratch to point to the CPUs own area
+ */
+
+union riscv_percpu_s
+{
+ union riscv_percpu_s *next; /* For sl list linkage */
+ struct
+ {
+ struct tcb_s *tcb; /* Current thread TCB */
+ uintreg_t hartid; /* Hart ID */
+ uintreg_t irq_stack; /* Interrupt stack */
+ uintreg_t usp; /* Area to store user sp */
+ uintreg_t ksp; /* Area to load kernel sp */
+ };
+};
+
+typedef union riscv_percpu_s riscv_percpu_t;
Review Comment:
arch_percpu_t
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