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sh: uncached mapping helpers.

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This adds some helper routines for uncached mapping support. This
simplifies some of the cases where we need to check the uncached mapping
boundaries in addition to giving us a centralized location for building
more complex manipulation on top of.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-02-17 16:28:00 +09:00
parent 51becfd962
commit 9edef28653
6 changed files with 58 additions and 30 deletions
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19
arch/sh/include/asm/page.h
View File

@ -50,13 +50,22 @@ extern unsigned long shm_align_mask;
extern unsigned long max_low_pfn, min_low_pfn;
extern unsigned long memory_start, memory_end;
#ifdef CONFIG_UNCACHED_MAPPING
extern unsigned long uncached_start, uncached_end;
extern int virt_addr_uncached(unsigned long kaddr);
extern void uncached_init(void);
#else
#define virt_addr_uncached(kaddr) (0)
#define uncached_init() do { } while (0)
#endif
static inline unsigned long
pages_do_alias(unsigned long addr1, unsigned long addr2)
{
return (addr1 ^ addr2) & shm_align_mask;
}
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, void *from);
@ -135,6 +144,14 @@ typedef struct page *pgtable_t;
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#endif
#ifdef CONFIG_UNCACHED_MAPPING
#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
#else
#define UNCAC_ADDR(addr) ((addr))
#define CAC_ADDR(addr) ((addr))
#endif
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)

11
arch/sh/include/asm/ptrace.h
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@ -139,15 +139,8 @@ static inline unsigned long profile_pc(struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
#ifdef CONFIG_UNCACHED_MAPPING
/*
* If PC points in to the uncached mapping, fix it up and hand
* back the cached equivalent.
*/
if ((pc >= (memory_start + cached_to_uncached)) &&
(pc < (memory_start + cached_to_uncached + uncached_size)))
pc -= cached_to_uncached;
#endif
if (virt_addr_uncached(pc))
return CAC_ADDR(pc);
return pc;
}

8
arch/sh/kernel/head_32.S
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@ -152,6 +152,7 @@ ENTRY(_stext)
mov #0, r10
#ifdef CONFIG_UNCACHED_MAPPING
/*
* Uncached mapping
*/
@ -171,6 +172,7 @@ ENTRY(_stext)
add r4, r1
add r4, r3
add #1, r10
#endif
/*
* Iterate over all of the available sizes from largest to
@ -216,6 +218,7 @@ ENTRY(_stext)
__PMB_ITER_BY_SIZE(64)
__PMB_ITER_BY_SIZE(16)
#ifdef CONFIG_UNCACHED_MAPPING
/*
* Now that we can access it, update cached_to_uncached and
* uncached_size.
@ -228,6 +231,7 @@ ENTRY(_stext)
shll16 r7
shll8 r7
mov.l r7, @r0
#endif
/*
* Clear the remaining PMB entries.
@ -306,7 +310,9 @@ ENTRY(stack_start)
.LFIRST_ADDR_ENTRY: .long PAGE_OFFSET | PMB_V
.LFIRST_DATA_ENTRY: .long __MEMORY_START | PMB_V
.LMMUCR: .long MMUCR
.LMEMORY_SIZE: .long __MEMORY_SIZE
#ifdef CONFIG_UNCACHED_MAPPING
.Lcached_to_uncached: .long cached_to_uncached
.Luncached_size: .long uncached_size
.LMEMORY_SIZE: .long __MEMORY_SIZE
#endif
#endif

1
arch/sh/mm/Makefile
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@ -36,6 +36,7 @@ obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_PMB) += pmb.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_IOREMAP_FIXED) += ioremap_fixed.o
obj-$(CONFIG_UNCACHED_MAPPING) += uncached.o
# Special flags for fault_64.o. This puts restrictions on the number of
# caller-save registers that the compiler can target when building this file.

21
arch/sh/mm/init.c
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@ -26,21 +26,6 @@
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
#ifdef CONFIG_UNCACHED_MAPPING
/*
* This is the offset of the uncached section from its cached alias.
*
* Legacy platforms handle trivial transitions between cached and
* uncached segments by making use of the 1:1 mapping relationship in
* 512MB lowmem, others via a special uncached mapping.
*
* Default value only valid in 29 bit mode, in 32bit mode this will be
* updated by the early PMB initialization code.
*/
unsigned long cached_to_uncached = 0x20000000;
unsigned long uncached_size = SZ_512M;
#endif
#ifdef CONFIG_MMU
static pte_t *__get_pte_phys(unsigned long addr)
{
@ -260,7 +245,7 @@ void __init mem_init(void)
memset(empty_zero_page, 0, PAGE_SIZE);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
/* Initialize the vDSO */
uncached_init();
vsyscall_init();
codesize = (unsigned long) &_etext - (unsigned long) &_text;
@ -303,9 +288,7 @@ void __init mem_init(void)
((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
#ifdef CONFIG_UNCACHED_MAPPING
(unsigned long)memory_start + cached_to_uncached,
(unsigned long)memory_start + cached_to_uncached + uncached_size,
uncached_size >> 20,
uncached_start, uncached_end, uncached_size >> 20,
#endif
(unsigned long)&__init_begin, (unsigned long)&__init_end,

28
arch/sh/mm/uncached.c Normal file
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@ -0,0 +1,28 @@
#include <linux/init.h>
#include <asm/sizes.h>
#include <asm/page.h>
/*
* This is the offset of the uncached section from its cached alias.
*
* Legacy platforms handle trivial transitions between cached and
* uncached segments by making use of the 1:1 mapping relationship in
* 512MB lowmem, others via a special uncached mapping.
*
* Default value only valid in 29 bit mode, in 32bit mode this will be
* updated by the early PMB initialization code.
*/
unsigned long cached_to_uncached = SZ_512M;
unsigned long uncached_size = SZ_512M;
unsigned long uncached_start, uncached_end;
int virt_addr_uncached(unsigned long kaddr)
{
return (kaddr >= uncached_start) && (kaddr < uncached_end);
}
void __init uncached_init(void)
{
uncached_start = memory_end;
uncached_end = uncached_start + uncached_size;
}