Unverified Commit 26eee2bf authored by Charlie Jenkins's avatar Charlie Jenkins Committed by Palmer Dabbelt
Browse files

RISC-V: mm: Update pgtable comment documentation 



sv57 is supported in the kernel so pgtable.h should reflect that.

Signed-off-by: default avatarCharlie Jenkins <charlie@rivosinc.com>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20230809232218.849726-4-charlie@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 4d0c04ea

arch/riscv/include/asm/pgtable.h

+5 −3
Original line number Diff line number Diff line
@@ -854,11 +854,13 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) 
 * -        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)