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Introduce HAS_MFAULTS_DELEGATION feature

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Conditionnally delegate page fault exceptions from M mode to S mode
based on the platform features.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
This commit is contained in:
Damien Le Moal
2018-12-21 19:19:54 +09:00
committed by Anup Patel
parent db6c1fe78b
commit 27332e63fa
3 changed files with 13 additions and 7 deletions
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12
lib/sbi_hart.c
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@@ -83,8 +83,9 @@ static int fp_init(u32 hartid)
return 0;
}
static int delegate_traps(u32 hartid)
static int delegate_traps(struct sbi_scratch *scratch, u32 hartid)
{
struct sbi_platform *plat = sbi_platform_ptr(scratch);
unsigned long interrupts, exceptions;
if (!misa_extension('S')) {
@@ -95,11 +96,12 @@ static int delegate_traps(u32 hartid)
/* Send M-mode interrupts and most exceptions to S-mode */
interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
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 (sbi_platform_has_mfaults_delegation(plat))
exceptions |= (1U << CAUSE_FETCH_PAGE_FAULT) |
(1U << CAUSE_LOAD_PAGE_FAULT) |
(1U << CAUSE_STORE_PAGE_FAULT);
}
csr_write(mideleg, interrupts);
@@ -200,7 +202,7 @@ int sbi_hart_init(struct sbi_scratch *scratch, u32 hartid)
if (rc)
return rc;
rc = delegate_traps(hartid);
rc = delegate_traps(scratch, hartid);
if (rc)
return rc;