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From:   Charlie Jenkins <charlie@rivosinc.com>
To:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     charlie@rivosinc.com, conor@kernel.org, paul.walmsley@sifive.com,
        palmer@rivosinc.com, aou@eecs.berkeley.edu, anup@brainfault.org,
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        alexghiti@rivosinc.com
Subject: [PATCH v7 3/4] RISC-V: mm: Update pgtable comment documentation
Date:   Wed, 26 Jul 2023 09:45:57 -0700
Message-ID: <20230726164620.717288-4-charlie@rivosinc.com>
In-Reply-To: <20230726164620.717288-1-charlie@rivosinc.com>
References: <20230726164620.717288-1-charlie@rivosinc.com>
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sv57 is supported in the kernel so pgtable.h should reflect that.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.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 530f6a171a2b..cd09ccd876b9 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -841,14 +841,16 @@ 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)
-- 
2.41.0