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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-09-06 20:04:59 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-01 16:40:56 +0100 |
| commit | bb30f36f9b71c31dc8fe3483bba4c9884fc86080 (patch) | |
| tree | c99b583586ebec2a29be2b0173d1eb9ad07a68f9 /arch/arm/mm/fault-armv.c | |
| parent | 9cff96e5bfc8e366166bfb07610604c7604ac48c (diff) | |
| download | op-kernel-dev-bb30f36f9b71c31dc8fe3483bba4c9884fc86080.zip op-kernel-dev-bb30f36f9b71c31dc8fe3483bba4c9884fc86080.tar.gz | |
[ARM] Introduce new PTE memory type bits
Provide L_PTE_MT_xxx definitions to describe the memory types that we
use in Linux/ARM. These definitions are carefully picked such that:
1. their LSBs match what is required for pre-ARMv6 CPUs.
2. they all have a unique encoding, including after modification
by build_mem_type_table() (the result being that some have more
than one combination.)
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/fault-armv.c')
| -rw-r--r-- | arch/arm/mm/fault-armv.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c index a8ec97b..6f92904 100644 --- a/arch/arm/mm/fault-armv.c +++ b/arch/arm/mm/fault-armv.c @@ -21,7 +21,7 @@ #include <asm/pgtable.h> #include <asm/tlbflush.h> -static unsigned long shared_pte_mask = L_PTE_CACHEABLE; +static unsigned long shared_pte_mask = L_PTE_MT_BUFFERABLE; /* * We take the easy way out of this problem - we make the @@ -63,9 +63,10 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address) * If this page isn't present, or is already setup to * fault (ie, is old), we can safely ignore any issues. */ - if (ret && pte_val(entry) & shared_pte_mask) { + if (ret && (pte_val(entry) & L_PTE_MT_MASK) != shared_pte_mask) { flush_cache_page(vma, address, pte_pfn(entry)); - pte_val(entry) &= ~shared_pte_mask; + pte_val(entry) &= ~L_PTE_MT_MASK; + pte_val(entry) |= shared_pte_mask; set_pte_at(vma->vm_mm, address, pte, entry); flush_tlb_page(vma, address); } @@ -197,7 +198,7 @@ void __init check_writebuffer_bugs(void) unsigned long *p1, *p2; pgprot_t prot = __pgprot(L_PTE_PRESENT|L_PTE_YOUNG| L_PTE_DIRTY|L_PTE_WRITE| - L_PTE_BUFFERABLE); + L_PTE_MT_BUFFERABLE); p1 = vmap(&page, 1, VM_IOREMAP, prot); p2 = vmap(&page, 1, VM_IOREMAP, prot); @@ -218,7 +219,7 @@ void __init check_writebuffer_bugs(void) if (v) { printk("failed, %s\n", reason); - shared_pte_mask |= L_PTE_BUFFERABLE; + shared_pte_mask = L_PTE_MT_UNCACHED; } else { printk("ok\n"); } |
