diff options
| author | Weiwei Li <liweiwei@iscas.ac.cn> | 2022-02-04 10:26:56 +0800 |
|---|---|---|
| committer | Alistair Francis <alistair.francis@wdc.com> | 2022-02-16 12:25:52 +1000 |
| commit | 2bacb22446a45b07f542d32b6d760da757233b20 (patch) | |
| tree | c82f0704c3f91cddad65bad7871cbbf424a5308e /target/riscv/cpu_helper.c | |
| parent | b6ecc63c569bb88c0fcadf79fb92bf4b88aefea8 (diff) | |
target/riscv: add support for svnapot extension
- add PTE_N bit
- add PTE_N bit check for inner PTE
- update address translation to support 64KiB continuous region (napot_bits = 4)
Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20220204022658.18097-4-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'target/riscv/cpu_helper.c')
| -rw-r--r-- | target/riscv/cpu_helper.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index 25ebc76725..437c9488a6 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -753,6 +753,8 @@ static int get_physical_address(CPURISCVState *env, hwaddr *physical, bool use_background = false; hwaddr ppn; RISCVCPU *cpu = env_archcpu(env); + int napot_bits = 0; + target_ulong napot_mask; /* * Check if we should use the background registers for the two @@ -937,7 +939,7 @@ restart: return TRANSLATE_FAIL; } else if (!(pte & (PTE_R | PTE_W | PTE_X))) { /* Inner PTE, continue walking */ - if (pte & (PTE_D | PTE_A | PTE_U)) { + if (pte & (PTE_D | PTE_A | PTE_U | PTE_N)) { return TRANSLATE_FAIL; } base = ppn << PGSHIFT; @@ -1013,8 +1015,18 @@ restart: /* for superpage mappings, make a fake leaf PTE for the TLB's benefit. */ target_ulong vpn = addr >> PGSHIFT; - *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) | - (addr & ~TARGET_PAGE_MASK); + + if (cpu->cfg.ext_svnapot && (pte & PTE_N)) { + napot_bits = ctzl(ppn) + 1; + if ((i != (levels - 1)) || (napot_bits != 4)) { + return TRANSLATE_FAIL; + } + } + + napot_mask = (1 << napot_bits) - 1; + *physical = (((ppn & ~napot_mask) | (vpn & napot_mask) | + (vpn & (((target_ulong)1 << ptshift) - 1)) + ) << PGSHIFT) | (addr & ~TARGET_PAGE_MASK); /* set permissions on the TLB entry */ if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) { |