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Date: Wed, 26 Aug 2009 14:18:53 +0800
From: Chen Liqin <liqin.chen@...plusct.com>
To: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>, torvalds@...ux-foundation.org
Subject: Subject: [PATCH 12/33] score: create head files mman.h mmu.h
mmu_context.h
>>From ea8c2b7695927955321995364b681f69f0ce9a0a Mon Sep 17 00:00:00 2001
From: Chen Liqin <liqin.chen@...plusct.com>
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 <liqin.chen@...plusct.com>
---
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 <asm-generic/mman.h>
+
+#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 <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 */
--
1.6.2
--
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