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include: sbi: Add sbi_regs_prev_xlen

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sbi_regs_prev_xlen reports the xlen of previous mode by decoding
from multiple CSRs including mstatus/hstatus/vsstatus

Signed-off-by: Bo Gan <ganboing@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
Link: https://lore.kernel.org/r/20260605113214.242-3-ganboing@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Bo Gan
2026-06-05 04:32:08 -07:00
committed by Anup Patel
parent 3c4fa3404e
commit bd986ed03d
1 changed files with 58 additions and 0 deletions
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include/sbi/sbi_trap.h
+58
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@@ -273,6 +273,64 @@ static inline int sbi_mstatus_prev_mode(unsigned long mstatus)
return (mstatus & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
}
#if __riscv_xlen == 32
static inline int sbi_regs_prev_xlen(const struct sbi_trap_regs *regs)
{
return __riscv_xlen;
}
#else
static inline int sbi_mstatus_sxl(unsigned long mstatus)
{
return (mstatus & MSTATUS_SXL) >> MSTATUS_SXL_SHIFT;
}
static inline int sbi_mstatus_uxl(unsigned long mstatus)
{
return (mstatus & MSTATUS_UXL) >> MSTATUS_UXL_SHIFT;
}
static inline int sbi_hstatus_vsxl(unsigned long hstatus)
{
return (hstatus & HSTATUS_VSXL) >> HSTATUS_VSXL_SHIFT;
}
static inline int sbi_regs_prev_xlen(const struct sbi_trap_regs *regs)
{
unsigned long hstatus, vsstatus;
if (!sbi_regs_from_virt(regs)) {
switch (sbi_mstatus_prev_mode(regs->mstatus)) {
case PRV_M:
return __riscv_xlen;
case PRV_S:
return MXL_TO_XLEN(sbi_mstatus_sxl(regs->mstatus));
case PRV_U:
return MXL_TO_XLEN(sbi_mstatus_uxl(regs->mstatus));
default:
__builtin_unreachable();
}
}
/* V=1, Check HSXLEN first */
if (sbi_mstatus_sxl(regs->mstatus) < MXL_XLEN_64)
return 32;
hstatus = csr_read(CSR_HSTATUS);
/* Check VSXLEN */
if (sbi_hstatus_vsxl(hstatus) < MXL_XLEN_64)
return 32;
vsstatus = csr_read(CSR_VSSTATUS);
switch (sbi_mstatus_prev_mode(regs->mstatus)) {
case PRV_S:
return MXL_TO_XLEN(sbi_hstatus_vsxl(hstatus));
case PRV_U:
return MXL_TO_XLEN(sbi_mstatus_uxl(vsstatus));
}
__builtin_unreachable();
}
#endif
int sbi_trap_redirect(struct sbi_trap_regs *regs,
const struct sbi_trap_info *trap);