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sh: Initial vsyscall page support.

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This implements initial support for the vsyscall page on SH.
At the moment we leave it configurable due to having nommu
to support from the same code base. We hook it up for the
signal trampoline return at present, with more to be added
later, once uClibc catches up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2006-09-27 18:33:49 +09:00
parent 8c12b5dc13
commit 19f9a34f87
19 changed files with 473 additions and 17 deletions
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8
include/asm-sh/mmu_context.h
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@@ -49,7 +49,7 @@ get_mmu_context(struct mm_struct *mm)
unsigned long mc = mmu_context_cache;
/* Check if we have old version of context. */
if (((mm->context ^ mc) & MMU_CONTEXT_VERSION_MASK) == 0)
if (((mm->context.id ^ mc) & MMU_CONTEXT_VERSION_MASK) == 0)
/* It's up to date, do nothing */
return;
@@ -68,7 +68,7 @@ get_mmu_context(struct mm_struct *mm)
if (!mc)
mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
}
mm->context = mc;
mm->context.id = mc;
}
/*
@@ -78,7 +78,7 @@ get_mmu_context(struct mm_struct *mm)
static __inline__ int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
mm->context = NO_CONTEXT;
mm->context.id = NO_CONTEXT;
return 0;
}
@@ -123,7 +123,7 @@ static __inline__ unsigned long get_asid(void)
static __inline__ void activate_context(struct mm_struct *mm)
{
get_mmu_context(mm);
set_asid(mm->context & MMU_CONTEXT_ASID_MASK);
set_asid(mm->context.id & MMU_CONTEXT_ASID_MASK);
}
/* MMU_TTB can be used for optimizing the fault handling.