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sh64: Set additional fault code values.

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The SSR.MD status amongst other things are already made available, which
can be used for encoding a more precise fault code value.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2012-05-14 17:46:49 +09:00
parent 392c3822a6
commit fd37e75ed5
1 changed files with 19 additions and 1 deletions
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20
arch/sh/mm/tlbex_64.c
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@ -108,6 +108,17 @@ static struct expevt_lookup expevt_lookup_table = {
.is_text_access = {1, 1, 0, 0, 0, 0, 0, 0}
};
static inline unsigned int
expevt_to_fault_code(unsigned long expevt)
{
if (expevt == 0xa40)
return FAULT_CODE_ITLB;
else if (expevt == 0x060)
return FAULT_CODE_WRITE;
return 0;
}
/*
This routine handles page faults that can be serviced just by refilling a
TLB entry from an existing page table entry. (This case represents a very
@ -123,6 +134,7 @@ do_fast_page_fault(unsigned long long ssr_md, unsigned long long expevt,
unsigned long long protection_flags;
unsigned long long index;
unsigned long long expevt4;
unsigned int fault_code;
/* The next few lines implement a way of hashing EXPEVT into a
* small array index which can be used to lookup parameters
@ -139,10 +151,16 @@ do_fast_page_fault(unsigned long long ssr_md, unsigned long long expevt,
index = expevt4 ^ (expevt4 >> 5);
index &= 7;
fault_code = expevt_to_fault_code(expevt);
protection_flags = expevt_lookup_table.protection_flags[index];
if (expevt_lookup_table.is_text_access[index])
set_thread_fault_code(FAULT_CODE_ITLB);
fault_code |= FAULT_CODE_ITLB;
if (!ssr_md)
fault_code |= FAULT_CODE_USER;
set_thread_fault_code(fault_code);
return handle_tlbmiss(protection_flags, address);
}