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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/score/include/asm/mmu_context.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/score/include/asm/mmu_context.h')
-rw-r--r-- | kernel/arch/score/include/asm/mmu_context.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/kernel/arch/score/include/asm/mmu_context.h b/kernel/arch/score/include/asm/mmu_context.h new file mode 100644 index 000000000..2644577c9 --- /dev/null +++ b/kernel/arch/score/include/asm/mmu_context.h @@ -0,0 +1,113 @@ +#ifndef _ASM_SCORE_MMU_CONTEXT_H +#define _ASM_SCORE_MMU_CONTEXT_H + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <asm-generic/mm_hooks.h> + +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> +#include <asm/scoreregs.h> + +/* + * For the fast tlb miss handlers, we keep a per cpu array of pointers + * to the current pgd for each processor. Also, the proc. id is stuffed + * into the context register. + */ +extern unsigned long asid_cache; +extern unsigned long pgd_current; + +#define TLBMISS_HANDLER_SETUP_PGD(pgd) (pgd_current = (unsigned long)(pgd)) + +#define TLBMISS_HANDLER_SETUP() \ +do { \ + write_c0_context(0); \ + TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) \ +} while (0) + +/* + * All unused by hardware upper bits will be considered + * as a software asid extension. + */ +#define ASID_VERSION_MASK 0xfffff000 +#define ASID_FIRST_VERSION 0x1000 + +/* PEVN --------- VPN ---------- --ASID--- -NA- */ +/* binary: 0000 0000 0000 0000 0000 0000 0001 0000 */ +/* binary: 0000 0000 0000 0000 0000 1111 1111 0000 */ +#define ASID_INC 0x10 +#define ASID_MASK 0xff0 + +static inline void enter_lazy_tlb(struct mm_struct *mm, + struct task_struct *tsk) +{} + +static inline void +get_new_mmu_context(struct mm_struct *mm) +{ + unsigned long asid = asid_cache + ASID_INC; + + if (!(asid & ASID_MASK)) { + local_flush_tlb_all(); /* start new asid cycle */ + if (!asid) /* fix version if needed */ + asid = ASID_FIRST_VERSION; + } + + mm->context = asid; + asid_cache = asid; +} + +/* + * Initialize the context related info for a new mm_struct + * instance. + */ +static inline int +init_new_context(struct task_struct *tsk, struct mm_struct *mm) +{ + mm->context = 0; + return 0; +} + +static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, + struct task_struct *tsk) +{ + unsigned long flags; + + local_irq_save(flags); + if ((next->context ^ asid_cache) & ASID_VERSION_MASK) + get_new_mmu_context(next); + + pevn_set(next->context); + TLBMISS_HANDLER_SETUP_PGD(next->pgd); + local_irq_restore(flags); +} + +/* + * 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) +{} + +static inline void +deactivate_mm(struct task_struct *task, struct mm_struct *mm) +{} + +/* + * After we have set current->mm to a new value, this activates + * the context for the new mm so we see the new mappings. + */ +static inline void +activate_mm(struct mm_struct *prev, struct mm_struct *next) +{ + unsigned long flags; + + local_irq_save(flags); + get_new_mmu_context(next); + pevn_set(next->context); + TLBMISS_HANDLER_SETUP_PGD(next->pgd); + local_irq_restore(flags); +} + +#endif /* _ASM_SCORE_MMU_CONTEXT_H */ |