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lib: sbi_trap: Add helper to get GVA in sbi_trap_regs

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The GVA bit is in mstatus on RV64, and in mstatush in RV32. Refactor
code handling this in sbi_trap_handler into a helper function to extract
GVA from sbi_trap_regs, so that future code accessing GVA can be
XLEN-agnostic.

Signed-off-by: Vivian Wang <dramforever@live.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Vivian Wang 2022-09-02 23:48:34 +08:00 • committed by Anup Patel
parent 19664f6757
commit 37a0d83b6d
2 changed files with 19 additions and 13 deletions
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18
include/sbi/sbi_trap.h
View file

@ -10,6 +10,8 @@
#ifndef __SBI_TRAP_H__
#define __SBI_TRAP_H__
#include <sbi/riscv_encoding.h>
/* clang-format off */
/** Index of zero member in sbi_trap_regs */
@ -206,6 +208,22 @@ struct sbi_trap_info {
unsigned long gva;
};
static inline unsigned long sbi_regs_gva(const struct sbi_trap_regs *regs)
{
/*
* If the hypervisor extension is not implemented, mstatus[h].GVA is a
* WPRI field, which is guaranteed to read as zero. In addition, in this
* case we don't read mstatush and instead pretend it is zero, which
* handles privileged spec version < 1.12.
*/
#if __riscv_xlen == 32
return (regs->mstatusH & MSTATUSH_GVA) ? 1 : 0;
#else
return (regs->mstatus & MSTATUS_GVA) ? 1 : 0;
#endif
}
int sbi_trap_redirect(struct sbi_trap_regs *regs,
struct sbi_trap_info *trap);

14
lib/sbi/sbi_trap.c
View file

@ -316,19 +316,7 @@ struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs)
trap.tval = mtval;
trap.tval2 = mtval2;
trap.tinst = mtinst;
/*
* If the hypervisor extension is not implemented,
* mstatus[h].GVA is a WPRI field, which is guaranteed to read
* as zero. In addition, in this case we don't read mstatush and
* instead pretend it is zero, which handles privileged spec
* version < 1.12.
*/
#if __riscv_xlen == 32
trap.gva = (regs->mstatusH & MSTATUSH_GVA) ? 1 : 0;
#else
trap.gva = (regs->mstatus & MSTATUS_GVA) ? 1 : 0;
#endif
trap.gva = sbi_regs_gva(regs);
rc = sbi_trap_redirect(regs, &trap);
break;