Author: kp Date: Wed Jul 1 19:15:43 2020 New Revision: 362853 URL: https://svnweb.freebsd.org/changeset/base/362853
Log: riscv pmap: zero reserved pte bits in ppn The top 10 bits of a pte are reserved by specification[1] and are not part of the PPN. [1] 'Volume II: RISC-V Privileged Architectures V20190608-Priv-MSU-Ratified', '4.4.1 Addressing and Memory Protection', page 72: "The PTE format for Sv39 is shown in Figure 4.18. ... Bits 63–54 are reserved for future use and must be zeroed by software for forward compatibility." Submitted by: Nathaniel Filardo <nw...@cl.cam.ac.uk> Reviewed by: kp, mhorne Differential Revision: https://reviews.freebsd.org/D25523 Modified: head/sys/riscv/include/pte.h head/sys/riscv/riscv/pmap.c Modified: head/sys/riscv/include/pte.h ============================================================================== --- head/sys/riscv/include/pte.h Wed Jul 1 19:12:47 2020 (r362852) +++ head/sys/riscv/include/pte.h Wed Jul 1 19:15:43 2020 (r362853) @@ -83,6 +83,9 @@ typedef uint64_t pn_t; /* page number */ #define PTE_PROMOTE (PTE_V | PTE_RWX | PTE_D | PTE_A | PTE_G | PTE_U | \ PTE_SW_MANAGED | PTE_SW_WIRED) +/* Bits 63 - 54 are reserved for future use. */ +#define PTE_HI_MASK 0xFFC0000000000000ULL + #define PTE_PPN0_S 10 #define PTE_PPN1_S 19 #define PTE_PPN2_S 28 Modified: head/sys/riscv/riscv/pmap.c ============================================================================== --- head/sys/riscv/riscv/pmap.c Wed Jul 1 19:12:47 2020 (r362852) +++ head/sys/riscv/riscv/pmap.c Wed Jul 1 19:15:43 2020 (r362853) @@ -339,7 +339,8 @@ pagezero(void *p) #define pmap_l2_index(va) (((va) >> L2_SHIFT) & Ln_ADDR_MASK) #define pmap_l3_index(va) (((va) >> L3_SHIFT) & Ln_ADDR_MASK) -#define PTE_TO_PHYS(pte) ((pte >> PTE_PPN0_S) * PAGE_SIZE) +#define PTE_TO_PHYS(pte) \ + ((((pte) & ~PTE_HI_MASK) >> PTE_PPN0_S) * PAGE_SIZE) static __inline pd_entry_t * pmap_l1(pmap_t pmap, vm_offset_t va) _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
