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Diffstat (limited to 'arch/riscv64/kernel/start.S')
| -rw-r--r-- | arch/riscv64/kernel/start.S | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/riscv64/kernel/start.S b/arch/riscv64/kernel/start.S new file mode 100644 index 0000000..4978cc0 --- /dev/null +++ b/arch/riscv64/kernel/start.S @@ -0,0 +1,36 @@ +#if GENERIC_UBOOT +# define MAIN main_go +#else +# define LOAD_REG a1 +# define MAIN main +#endif + +.section .kernel.start +.global _start +_start: +/* get load address */ +auipc a2, 0 + +/* load initial stack */ +lla sp, riscv_init_stack +li t0, 4096 +add sp, sp, t0 + +/* set thread pointer to zero so we don't accidentally try to use a tcb */ +li tp, 0 + +/* call main, whichever one is relevant */ +call MAIN +ret + +.section .text + +/* a0 is fdt, a1 is load_addr, a2 is d, a3 is ram_base, a4 is DMAP */ +.global to_kernelspace +to_kernelspace: +lla t0, kernel +add t0, t0, a4 +sub t0, t0, a3 +add sp, sp, a4 +sub sp, sp, a3 +jr t0 |