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firmware: fw_base: Simplified setup trap handler

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The same detection was done twice when setting mtvec and trap_exit.
Merging can reduce code size.

Signed-off-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Xiang W 2024-03-04 20:15:49 +08:00 • committed by Anup Patel
parent fdf5589f04
commit b27b7c6d88
1 changed files with 4 additions and 12 deletions
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16
firmware/fw_base.S
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@ -456,23 +456,15 @@ _start_warm:
srli a5, a5, ('H' - 'A')
andi a5, a5, 0x1
beq a5, zero, _skip_trap_handler_rv32_hyp
/* Override trap exit for H-extension */
csrr a5, CSR_MSCRATCH
lla a4, _trap_exit_rv32_hyp
REG_S a4, SBI_SCRATCH_TRAP_EXIT_OFFSET(a5)
lla a4, _trap_handler_rv32_hyp
_skip_trap_handler_rv32_hyp:
#endif
csrw CSR_MTVEC, a4
#if __riscv_xlen == 32
/* Override trap exit for H-extension */
csrr a5, CSR_MISA
srli a5, a5, ('H' - 'A')
andi a5, a5, 0x1
beq a5, zero, _skip_trap_exit_rv32_hyp
lla a4, _trap_exit_rv32_hyp
csrr a5, CSR_MSCRATCH
REG_S a4, SBI_SCRATCH_TRAP_EXIT_OFFSET(a5)
_skip_trap_exit_rv32_hyp:
#endif
/* Initialize SBI runtime */
csrr a0, CSR_MSCRATCH
call sbi_init