OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

RISC-V: Fix PLIC pending bitfield reads 

The address calculation for the pending bitfield had
a copy paste bug. This bug went unnoticed because the Linux
PLIC driver does not read the pending bitfield, rather it
reads pending interrupt numbers from the claim register
and writes acknowledgements back to the claim register.

Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Sagar Karandikar <sagark@eecs.berkeley.edu>
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Cc: Alistair Francis <Alistair.Francis@wdc.com>
Reported-by: Vincent Siles <vincent.siles@ens-lyon.org>
Signed-off-by: Michael Clark <mjc@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Michael Clark 2018-12-14 00:18:54 +00:00 committed by Palmer Dabbelt
parent ef9e41df68
commit e41848e5c9
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
hw/riscv/sifive_plic.c
View File

@ -214,7 +214,7 @@ static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned size)
} else if (addr >= plic->pending_base && /* 1 bit per source */
addr < plic->pending_base + (plic->num_sources >> 3))
{
uint32_t word = (addr - plic->priority_base) >> 2;
uint32_t word = (addr - plic->pending_base) >> 2;
if (RISCV_DEBUG_PLIC) {
qemu_log("plic: read pending: word=%d value=%d\n",
word, plic->pending[word]);