inochisa commented on code in PR #12178: URL: https://github.com/apache/nuttx/pull/12178#discussion_r1580773937
########## arch/risc-v/src/common/riscv_macros.S: ########## @@ -364,3 +364,35 @@ csrr \out, CSR_MHARTID #endif .endm + +/**************************************************************************** + * Name: riscv_set_inital_sp + * + * Description: + * Set inital sp for riscv core. This function should be only called + * when initing. + * + * sp (stack top) = sp base + idle stack size * hart id + * sp (stack base) = sp (stack top) + idle stack size * - XCPTCONTEXT_SIZE + * + * Note: The XCPTCONTEXT_SIZE byte after stack base is reserved for + * up_initial_state since we are already running and using + * the per CPU idle stack. + * Parameter: + * base - Pointer to where the stack is allocated (e.g. _ebss) + * size - Stack size for pre cpu to allocate + * size - Hart id register of this hart (Usually a0) + * + ****************************************************************************/ +.macro riscv_set_inital_sp base, size, hartid + la t0, \base + li t1, \size + mul t1, \hartid, t1 + add t0, t0, t1 + + /* ensure the last XCPTCONTEXT_SIZE is reserved */ + + li t1, STACK_ALIGN_DOWN(\size - XCPTCONTEXT_SIZE) Review Comment: I have update the macro and now boot hart (CPU0) use stack top for its stack. And the stack usage decreases from 86.6% to 51.9%. Thanks for your review. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
