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Set PLIC Interrupt Priority in RISC-V Assembly. Same problem

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Lee Lup Yuen 2023-11-25 19:10:00 +08:00
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@ -3335,6 +3335,8 @@ TODO: Key press not read correctly
TODO: Why is up_irqinitialize not setting Interrupt Priority properly? Signed arithmetic? Or delay?
# Strangeness in Ox64 BL808 PLIC
TODO: Why is Interrupt Priority set for 4 Interrupts, when we only set 1 (for UART)?
```text
@ -3387,7 +3389,76 @@ test_interrupt_priority():
50200db8: 05462803 lw a6,84(a2)
```
(sfence doesn't help)
sfence doesn't help...
```text
0000000050200daa <test_interrupt_priority>:
test_interrupt_priority():
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:451
uint32_t before1 = *(volatile uint32_t *) 0xe0000050;
50200daa: 461d li a2,7
50200dac: 0676 slli a2,a2,0x1d
50200dae: 4a34 lw a3,80(a2)
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:452
uint32_t before2 = *(volatile uint32_t *) 0xe0000054;
50200db0: 4a78 lw a4,84(a2)
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:455
*(volatile uint32_t *) 0xe0000050 = 1;
50200db2: 4785 li a5,1
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:451
uint32_t before1 = *(volatile uint32_t *) 0xe0000050;
50200db4: 2681 sext.w a3,a3
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:452
uint32_t before2 = *(volatile uint32_t *) 0xe0000054;
50200db6: 2701 sext.w a4,a4
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:455
*(volatile uint32_t *) 0xe0000050 = 1;
50200db8: ca3c sw a5,80(a2)
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:458
__asm__ __volatile__
50200dba: 12000073 sfence.vma
50200dbe: 0330000f fence rw,rw
50200dc2: 0000100f fence.i
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:467
uint32_t after1 = *(volatile uint32_t *) 0xe0000050;
50200dc6: 4a3c lw a5,80(a2)
50200dc8: 2781 sext.w a5,a5
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:469
__asm__ __volatile__
50200dca: 12000073 sfence.vma
50200dce: 0330000f fence rw,rw
50200dd2: 0000100f fence.i
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:477
uint32_t after2 = *(volatile uint32_t *) 0xe0000054;
50200dd6: 05462803 lw a6,84(a2)
50200dda: 2801 sext.w a6,a6
/Users/Luppy/ox64/nuttx/arch/risc-v/src/chip/bl602_serial.c:479
__asm__ __volatile__
50200ddc: 12000073 sfence.vma
50200de0: 0330000f fence rw,rw
50200de4: 0000100f fence.i
```
Let's do the same with U-Boot Bootloader. Looks OK...
```bash
## Read the values before setting Interrupt Priority
=> md 0xe0000050 1
e0000050: 00000000 ....
=> md 0xe0000054 1
e0000054: 00000000 ....
## Set the Interrupt Priority
=> mw 0xe0000050 0x01 1
## Read the values after setting Interrupt Priority
=> md 0xe0000050 1
e0000050: 00000001 ....
=> md 0xe0000054 1
e0000054: 00000000 ....
```
TODO
# Documentation for Ox64 BL808