diff options
Diffstat (limited to 'assembly/rrxing2')
| -rw-r--r-- | assembly/rrxing2/rrxing2.S | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/assembly/rrxing2/rrxing2.S b/assembly/rrxing2/rrxing2.S index c94edc0..bb2c4dc 100644 --- a/assembly/rrxing2/rrxing2.S +++ b/assembly/rrxing2/rrxing2.S @@ -8,6 +8,9 @@ j _start .include "util.S" _start: +la t0,nmihandler +csrw 0xbc0,t0 # Set up RNMI handler +csrsi mnstatus,8 # Turn on NMIE li t0,0x400 csrs mseccfg,t0 # Turn on MLPE (enable Zicfilp) li sp,0x10000 # Set up stack pointer @@ -187,6 +190,19 @@ ecall # Tell the user li a7,10 ecall # Then halt +.align 2 +nmihandler: +li a7,4 +la a0,uinmi +ecall # Display NMI message + +csrr a0,mncause # Read what the cause was +li a7,1 +ecall # Tell the user + +li a7,10 +ecall # Then halt + states: .word destate0,destate1,destate2,destate3,destate4,destate5,destate6,0,0,0,0,0,0,0,0,0 .word ukstate0,ukstate1,ukstate2,ukstate3,ukstate4,ukstate5,ukstate6,ukstate7,0,0,0,0,0,0,0,0 .word usstate0,usstate1,usstate2,usstate3,usstate4,0,0,0,0,0,0,0,0,0,0,0 @@ -364,7 +380,8 @@ activetime: .byte 15 extensiontime: .byte 25 traincounter: .word 0 -uiunimplementedtrap: .asciz "Unimplemented trap!\nmcause: " +uiunimplementedtrap: .asciz "\nUnimplemented trap!\nmcause: " +uinmi: .asciz "\nUnexpected NMI!\nmncause: " channelbuf: .skip 16 msgbuf: .skip 16 lightchannel: .asciz "light" |