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sh: reworked dynamic PMB mapping.

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This implements a fairly significant overhaul of the dynamic PMB mapping
code. The primary change here is that the PMB gets its own VMA that
follows the uncached mapping and we attempt to be a bit more intelligent
with dynamic sizing, multi-entry mapping, and so forth.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2010-02-23 16:20:53 +09:00
parent 94316cdadb
commit 90e7d649d8
5 changed files with 225 additions and 170 deletions
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31
arch/sh/include/asm/mmu.h
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@@ -55,19 +55,29 @@ typedef struct {
#ifdef CONFIG_PMB
/* arch/sh/mm/pmb.c */
long pmb_remap(unsigned long virt, unsigned long phys,
unsigned long size, pgprot_t prot);
void pmb_unmap(unsigned long addr);
void pmb_init(void);
bool __in_29bit_mode(void);
void pmb_init(void);
int pmb_bolt_mapping(unsigned long virt, phys_addr_t phys,
unsigned long size, pgprot_t prot);
void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size,
pgprot_t prot, void *caller);
int pmb_unmap(void __iomem *addr);
#else
static inline long pmb_remap(unsigned long virt, unsigned long phys,
unsigned long size, pgprot_t prot)
static inline void __iomem *
pmb_remap_caller(phys_addr_t phys, unsigned long size,
pgprot_t prot, void *caller)
{
return NULL;
}
static inline int pmb_unmap(void __iomem *addr)
{
return -EINVAL;
}
#define pmb_unmap(addr) do { } while (0)
#define pmb_init(addr) do { } while (0)
#ifdef CONFIG_29BIT
@@ -77,6 +87,13 @@ static inline long pmb_remap(unsigned long virt, unsigned long phys,
#endif
#endif /* CONFIG_PMB */
static inline void __iomem *
pmb_remap(phys_addr_t phys, unsigned long size, pgprot_t prot)
{
return pmb_remap_caller(phys, size, prot, __builtin_return_address(0));
}
#endif /* __ASSEMBLY__ */
#endif /* __MMU_H */