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[PATCH v2 1/3] target/riscv: add support for svnapot extension
From: |
Weiwei Li |
Subject: |
[PATCH v2 1/3] target/riscv: add support for svnapot extension |
Date: |
Fri, 31 Dec 2021 16:09:21 +0800 |
Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
---
target/riscv/cpu.c | 1 +
target/riscv/cpu.h | 1 +
target/riscv/cpu_bits.h | 1 +
target/riscv/cpu_helper.c | 20 ++++++++++++++++----
4 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 6ef3314bce..cbcb7f522b 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -647,6 +647,7 @@ static Property riscv_cpu_properties[] = {
DEFINE_PROP_BOOL("zbs", RISCVCPU, cfg.ext_zbs, true),
DEFINE_PROP_BOOL("x-h", RISCVCPU, cfg.ext_h, false),
DEFINE_PROP_BOOL("x-j", RISCVCPU, cfg.ext_j, false),
+ DEFINE_PROP_BOOL("x-svnapot", RISCVCPU, cfg.ext_svnapot, false),
/* ePMP 0.9.3 */
DEFINE_PROP_BOOL("x-epmp", RISCVCPU, cfg.epmp, false),
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index dc10f27093..1fbbde28c6 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -315,6 +315,7 @@ struct RISCVCPU {
bool ext_counters;
bool ext_ifencei;
bool ext_icsr;
+ bool ext_svnapot;
bool ext_zfh;
bool ext_zfhmin;
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 1e31f4d35f..1156c941cb 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -483,6 +483,7 @@ typedef enum {
#define PTE_A 0x040 /* Accessed */
#define PTE_D 0x080 /* Dirty */
#define PTE_SOFT 0x300 /* Reserved for Software */
+#define PTE_N 0x8000000000000000 /* NAPOT translation */
/* Page table PPN shift amount */
#define PTE_PPN_SHIFT 10
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 10f3baba53..e044153986 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -619,9 +619,12 @@ restart:
return TRANSLATE_FAIL;
}
- hwaddr ppn = pte >> PTE_PPN_SHIFT;
+ hwaddr ppn = (pte & ~(target_ulong)PTE_N) >> PTE_PPN_SHIFT;
- if (!(pte & PTE_V)) {
+ RISCVCPU *cpu = env_archcpu(env);
+ if (!cpu->cfg.ext_svnapot && (pte & PTE_N)) {
+ return TRANSLATE_FAIL;
+ } else if (!(pte & PTE_V)) {
/* Invalid PTE */
return TRANSLATE_FAIL;
} else if (!(pte & (PTE_R | PTE_W | PTE_X))) {
@@ -699,8 +702,17 @@ 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);
+
+ int napot_bits = ((pte & PTE_N) ? (ctzl(ppn) + 1) : 0);
+ if (((pte & PTE_N) && ((ppn == 0) || (i != (levels - 1)))) ||
+ (napot_bits != 0 && napot_bits != 4)) {
+ return TRANSLATE_FAIL;
+ }
+
+ *physical = (((ppn & ~(((target_ulong)1 << napot_bits) - 1)) |
+ (vpn & (((target_ulong)1 << napot_bits) - 1)) |
+ (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)) {
--
2.17.1