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Message-ID: <20230809232218.849726-4-charlie@rivosinc.com>
Date: Wed, 9 Aug 2023 16:22:03 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: charlie@...osinc.com, conor@...nel.org, paul.walmsley@...ive.com,
palmer@...osinc.com, aou@...s.berkeley.edu, anup@...infault.org,
konstantin@...uxfoundation.org, linux-doc@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
mick@....forth.gr, jrtc27@...c27.com, rdunlap@...radead.org,
alexghiti@...osinc.com
Subject: [PATCH v10 3/4] RISC-V: mm: Update pgtable comment documentation
sv57 is supported in the kernel so pgtable.h should reflect that.
Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
arch/riscv/include/asm/pgtable.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index bb0b9ac7b581..2c5f6c8edc8a 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -851,14 +851,16 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
* Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32.
* Note that PGDIR_SIZE must evenly divide TASK_SIZE.
* Task size is:
- * - 0x9fc00000 (~2.5GB) for RV32.
- * - 0x4000000000 ( 256GB) for RV64 using SV39 mmu
- * - 0x800000000000 ( 128TB) for RV64 using SV48 mmu
+ * - 0x9fc00000 (~2.5GB) for RV32.
+ * - 0x4000000000 ( 256GB) for RV64 using SV39 mmu
+ * - 0x800000000000 ( 128TB) for RV64 using SV48 mmu
+ * - 0x100000000000000 ( 64PB) for RV64 using SV57 mmu
*
* Note that PGDIR_SIZE must evenly divide TASK_SIZE since "RISC-V
* Instruction Set Manual Volume II: Privileged Architecture" states that
* "load and store effective addresses, which are 64bits, must have bits
* 63–48 all equal to bit 47, or else a page-fault exception will occur."
+ * Similarly for SV57, bits 63–57 must be equal to bit 56.
*/
#ifdef CONFIG_64BIT
#define TASK_SIZE_64 (PGDIR_SIZE * PTRS_PER_PGD / 2)
--
2.34.1
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