Comment result of inspecting disassembly
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parent
2bce140e57
commit
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32
src/main.rs
32
src/main.rs
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@ -31,28 +31,28 @@ unsafe extern "C" fn _enter() -> ! {
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"la gp, _global_pointer",
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"la gp, _global_pointer",
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".option pop", // pops the current option stack
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".option pop", // pops the current option stack
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// // delegate all traps to S-mode trap handler
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// delegate all traps to S-mode trap handler
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// "li t5, 0xffff",
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"li t5, 0xffff",
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// "csrw medeleg, t5", // delegate all machine exceptions
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"csrw medeleg, t5", // delegate all machine exceptions
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// "csrw mideleg, t5", // delegate all machine interrupts
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"csrw mideleg, t5", // delegate all machine interrupts
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// set the stack pointer
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// set the stack pointer
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"la sp, _init_stack_top",
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"la sp, _init_stack_top",
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// // Make sure machine mode is set, and enable coarse interrupts
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// Make sure machine mode is set, and enable coarse interrupts
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// "li t0, (0b11 << 11) | (1 << 7) | (1 << 3)",
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"li t0, (0b11 << 11) | (1 << 7) | (1 << 3)",
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// "csrw mstatus, t0",
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"csrw mstatus, t0",
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// // Set mtvec to the location of our trap handler function
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// Set mtvec to the location of our trap handler function
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// "la t1, {trap_vector}",
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"la t1, {trap_vector}",
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// "csrw mtvec, t1",
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"csrw mtvec, t1",
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// // Set MSIE, MTIE, and MEIE on machine interrupt enable CSR:
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// Set MSIE, MTIE, and MEIE on machine interrupt enable CSR:
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// // MSIE to enable machine-/M-mode software interrupts
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// MSIE to enable machine-/M-mode software interrupts
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// // MTIE to enable M-mode timer interrupts
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// MTIE to enable M-mode timer interrupts
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// // MEIE to enable M-mode external interrupts
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// MEIE to enable M-mode external interrupts
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//"li t2, (1 << 3) | (1 << 7) | (1 << 11)",
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//"li t2, (1 << 3) | (1 << 7) | (1 << 11)",
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// "csrw mie, t2",
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//"csrw mie, t2", -> This is causing problems - after setting this register the kernel hangs
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// clear the BSS
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// clear the BSS
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"la t0, _bss_start",
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"la t0, _bss_start",
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@ -75,7 +75,7 @@ unsafe extern "C" fn _enter() -> ! {
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// "tail-call" to {start} (call without saving a return address)
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// "tail-call" to {start} (call without saving a return address)
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"tail {start}",
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"tail {start}",
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start = sym start, // {start} refers to the function [start] below
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start = sym start, // {start} refers to the function [start] below
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//trap_vector = sym trap::trap_handler, // {trap_vector} refers to function [trap::trap_handler]
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trap_vector = sym trap::trap_handler, // {trap_vector} refers to function [trap::trap_handler]
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options(noreturn) // we must handle "returning" from assembly
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options(noreturn) // we must handle "returning" from assembly
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);
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);
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}
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}
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