diff --git a/src/main.rs b/src/main.rs index 40b2e7e..8eaad95 100644 --- a/src/main.rs +++ b/src/main.rs @@ -31,28 +31,28 @@ unsafe extern "C" fn _enter() -> ! { "la gp, _global_pointer", ".option pop", // pops the current option stack - // delegate all traps to S-mode trap handler - "li t5, 0xffff", - "csrw medeleg, t5", // delegate all machine exceptions - "csrw mideleg, t5", // delegate all machine interrupts + // // delegate all traps to S-mode trap handler + // "li t5, 0xffff", + // "csrw medeleg, t5", // delegate all machine exceptions + // "csrw mideleg, t5", // delegate all machine interrupts // set the stack pointer "la sp, _init_stack_top", - // Make sure machine mode is set, and enable coarse interrupts - "li t0, (0b11 << 11) | (1 << 7) | (1 << 3)", - "csrw mstatus, t0", + // // Make sure machine mode is set, and enable coarse interrupts + // "li t0, (0b11 << 11) | (1 << 7) | (1 << 3)", + // "csrw mstatus, t0", - // Set mtvec to the location of our trap handler function - "la t1, {trap_vector}", - "csrw mtvec, t1", + // // Set mtvec to the location of our trap handler function + // "la t1, {trap_vector}", + // "csrw mtvec, t1", - // Set MSIE, MTIE, and MEIE on machine interrupt enable CSR: - // MSIE to enable machine-/M-mode software interrupts - // MTIE to enable M-mode timer interrupts - // MEIE to enable M-mode external interrupts - "li t2, (1 << 3) | (1 << 7) | (1 << 11)", - "csrw mie, t2", + // // Set MSIE, MTIE, and MEIE on machine interrupt enable CSR: + // // MSIE to enable machine-/M-mode software interrupts + // // MTIE to enable M-mode timer interrupts + // // MEIE to enable M-mode external interrupts + // "li t2, (1 << 3) | (1 << 7) | (1 << 11)", + // "csrw mie, t2", // clear the BSS "la t0, _bss_start", @@ -75,7 +75,7 @@ unsafe extern "C" fn _enter() -> ! { // "tail-call" to {start} (call without saving a return address) "tail {start}", start = sym start, // {start} refers to the function [start] below - trap_vector = sym trap::trap_handler, // {trap_vector} refers to function [trap::trap_handler] + //trap_vector = sym trap::trap_handler, // {trap_vector} refers to function [trap::trap_handler] options(noreturn) // we must handle "returning" from assembly ); }