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lib: sbi: add Ssdbltrp ISA extension support

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Add Ssdbltrp trap handler support for S-mode double trap handling. If
the trap is received while in VS-mode, then the trap is redirected to
S-mode. If caught while in HS-mode, then an error is returned to the top
trap handler which will panic.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Clément Léger
2024-10-18 10:40:04 +02:00
committed by Anup Patel
parent 80656bdb1d
commit 9c78593269
7 changed files with 46 additions and 1 deletions
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4
lib/sbi/sbi_hart.c
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@@ -117,6 +117,9 @@ static void mstatus_init(struct sbi_scratch *scratch)
menvcfg_val |= ((uint64_t)csr_read(CSR_MENVCFGH)) << 32;
#endif
/* Disable double trap by default */
menvcfg_val &= ~ENVCFG_DTE;
#define __set_menvcfg_ext(__ext, __bits) \
if (sbi_hart_has_extension(scratch, __ext)) \
menvcfg_val |= __bits;
@@ -684,6 +687,7 @@ const struct sbi_hart_ext_data sbi_hart_ext[] = {
__SBI_HART_EXT_DATA(smnpm, SBI_HART_EXT_SMNPM),
__SBI_HART_EXT_DATA(zicfilp, SBI_HART_EXT_ZICFILP),
__SBI_HART_EXT_DATA(zicfiss, SBI_HART_EXT_ZICFISS),
__SBI_HART_EXT_DATA(ssdbltrp, SBI_HART_EXT_SSDBLTRP),
};
_Static_assert(SBI_HART_EXT_MAX == array_size(sbi_hart_ext),