| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_SH_MMU_CONTEXT_64_H |
| #define __ASM_SH_MMU_CONTEXT_64_H |
| |
| /* |
| * sh64-specific mmu_context interface. |
| * |
| * Copyright (C) 2000, 2001 Paolo Alberelli |
| * Copyright (C) 2003 - 2007 Paul Mundt |
| */ |
| #include <cpu/registers.h> |
| #include <asm/cacheflush.h> |
| |
| #define SR_ASID_MASK 0xffffffffff00ffffULL |
| #define SR_ASID_SHIFT 16 |
| |
| /* |
| * Destroy context related info for an mm_struct that is about |
| * to be put to rest. |
| */ |
| static inline void destroy_context(struct mm_struct *mm) |
| { |
| /* Well, at least free TLB entries */ |
| flush_tlb_mm(mm); |
| } |
| |
| static inline unsigned long get_asid(void) |
| { |
| unsigned long long sr; |
| |
| asm volatile ("getcon " __SR ", %0\n\t" |
| : "=r" (sr)); |
| |
| sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK; |
| return (unsigned long) sr; |
| } |
| |
| /* Set ASID into SR */ |
| static inline void set_asid(unsigned long asid) |
| { |
| unsigned long long sr, pc; |
| |
| asm volatile ("getcon " __SR ", %0" : "=r" (sr)); |
| |
| sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT); |
| |
| /* |
| * It is possible that this function may be inlined and so to avoid |
| * the assembler reporting duplicate symbols we make use of the |
| * gas trick of generating symbols using numerics and forward |
| * reference. |
| */ |
| asm volatile ("movi 1, %1\n\t" |
| "shlli %1, 28, %1\n\t" |
| "or %0, %1, %1\n\t" |
| "putcon %1, " __SR "\n\t" |
| "putcon %0, " __SSR "\n\t" |
| "movi 1f, %1\n\t" |
| "ori %1, 1 , %1\n\t" |
| "putcon %1, " __SPC "\n\t" |
| "rte\n" |
| "1:\n\t" |
| : "=r" (sr), "=r" (pc) : "0" (sr)); |
| } |
| |
| /* arch/sh/kernel/cpu/sh5/entry.S */ |
| extern unsigned long switch_and_save_asid(unsigned long new_asid); |
| |
| /* No spare register to twiddle, so use a software cache */ |
| extern pgd_t *mmu_pdtp_cache; |
| |
| #define set_TTB(pgd) (mmu_pdtp_cache = (pgd)) |
| #define get_TTB() (mmu_pdtp_cache) |
| |
| #endif /* __ASM_SH_MMU_CONTEXT_64_H */ |
