From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chen Liqin Subject: Subject: [PATCH 12/33] score: create head files mman.h mmu.h mmu_context.h Date: Wed, 26 Aug 2009 14:18:53 +0800 Message-ID: <1251267533.3073.17.camel@ad3ser01> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from 124-219-29-227.vdslpro.static.apol.com.tw ([124.219.29.227]:52651 "EHLO mswedge2.sunplus.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751375AbZHZG3Q (ORCPT ); Wed, 26 Aug 2009 02:29:16 -0400 Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Arnd Bergmann , torvalds@linux-foundation.org >From ea8c2b7695927955321995364b681f69f0ce9a0a Mon Sep 17 00:00:00 2001 From: Chen Liqin Date: Wed, 26 Aug 2009 10:05:01 +0800 Subject: [PATCH 12/33] score: create head files mman.h mmu.h mmu_context.h Signed-off-by: Chen Liqin --- arch/score/include/asm/mman.h | 6 ++ arch/score/include/asm/mmu.h | 6 ++ arch/score/include/asm/mmu_context.h | 113 ++++++++++++++++++++++++++++++++++ 3 files changed, 125 insertions(+), 0 deletions(-) create mode 100644 arch/score/include/asm/mman.h create mode 100644 arch/score/include/asm/mmu.h create mode 100644 arch/score/include/asm/mmu_context.h diff --git a/arch/score/include/asm/mman.h b/arch/score/include/asm/mman.h new file mode 100644 index 0000000..84d85dd --- /dev/null +++ b/arch/score/include/asm/mman.h @@ -0,0 +1,6 @@ +#ifndef _ASM_SCORE_MMAN_H +#define _ASM_SCORE_MMAN_H + +#include + +#endif /* _ASM_SCORE_MMAN_H */ diff --git a/arch/score/include/asm/mmu.h b/arch/score/include/asm/mmu.h new file mode 100644 index 0000000..676828e --- /dev/null +++ b/arch/score/include/asm/mmu.h @@ -0,0 +1,6 @@ +#ifndef _ASM_SCORE_MMU_H +#define _ASM_SCORE_MMU_H + +typedef unsigned long mm_context_t; + +#endif /* _ASM_SCORE_MMU_H */ diff --git a/arch/score/include/asm/mmu_context.h b/arch/score/include/asm/mmu_context.h new file mode 100644 index 0000000..2644577 --- /dev/null +++ b/arch/score/include/asm/mmu_context.h @@ -0,0 +1,113 @@ +#ifndef _ASM_SCORE_MMU_CONTEXT_H +#define _ASM_SCORE_MMU_CONTEXT_H + +#include +#include +#include +#include + +#include +#include +#include + +/* + * 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 */ -- 1.6.2