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Fix interrupt and exception delegation 

When S mode is not supported, simply clear mideleg and medeleg.
Otherwise, set delegation from M-mode to S-mode, removing the page
fault exceptions as those would not happen in M-mode.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
This commit is contained in:
Damien Le Moal 2018-12-21 15:05:33 +09:00
parent 9c183df632
commit d403c70fb1
1 changed files with 12 additions and 10 deletions
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22
lib/sbi_hart.c
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@ -77,17 +77,19 @@ static int fp_init(u32 hartid)
static int delegate_traps(u32 hartid) static int delegate_traps(u32 hartid)
{ {
/* send S-mode interrupts and most exceptions straight to S-mode */ unsigned long interrupts, exceptions;
unsigned long interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
unsigned long exceptions = (1U << CAUSE_MISALIGNED_FETCH) |
(1U << CAUSE_FETCH_PAGE_FAULT) |
(1U << CAUSE_BREAKPOINT) |
(1U << CAUSE_LOAD_PAGE_FAULT) |
(1U << CAUSE_STORE_PAGE_FAULT) |
(1U << CAUSE_USER_ECALL);
if (!misa_extension('S')) if (!misa_extension('S')) {
return 0; /* No delegation possible */
interrupts = 0;
exceptions = 0;
} else {
/* Send M-mode interrupts and most exceptions to S-mode */
interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
exceptions = (1U << CAUSE_MISALIGNED_FETCH) |
(1U << CAUSE_BREAKPOINT) |
(1U << CAUSE_USER_ECALL);
}
csr_write(mideleg, interrupts); csr_write(mideleg, interrupts);
csr_write(medeleg, exceptions); csr_write(medeleg, exceptions);