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author | 2020-01-31 13:45:35 +0100 | |
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committer | 2020-02-10 10:57:48 +0100 | |
commit | 5ad272abee9fe0a781d49b03f334c0a3b3e418c1 (patch) | |
tree | 56bda1957ead57e29ffcfe23454d360baea5108f /arch/m68k/mm | |
parent | m68k: mm: Unify Motorola MMU page setup (diff) | |
download | linux-5ad272abee9fe0a781d49b03f334c0a3b3e418c1.tar.gz linux-5ad272abee9fe0a781d49b03f334c0a3b3e418c1.tar.bz2 linux-5ad272abee9fe0a781d49b03f334c0a3b3e418c1.zip |
m68k: mm: Move the pointer table allocator to motorola.c
Only the Motorola MMU makes use of this allocator, it is a waste of
.text to include it for Sun3/ColdFire. Also, this is going to avoid
build issues when we're going to make it more Motorola specific.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>
Link: https://lore.kernel.org/r/20200131125403.654652162@infradead.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/mm')
-rw-r--r-- | arch/m68k/mm/memory.c | 102 | ||||
-rw-r--r-- | arch/m68k/mm/motorola.c | 102 |
2 files changed, 102 insertions, 102 deletions
diff --git a/arch/m68k/mm/memory.c b/arch/m68k/mm/memory.c index 36683f2a28d0..65e0c4071912 100644 --- a/arch/m68k/mm/memory.c +++ b/arch/m68k/mm/memory.c @@ -22,108 +22,6 @@ #include <asm/machdep.h> -/* ++andreas: {get,free}_pointer_table rewritten to use unused fields from - struct page instead of separately kmalloced struct. Stolen from - arch/sparc/mm/srmmu.c ... */ - -typedef struct list_head ptable_desc; -static LIST_HEAD(ptable_list); - -#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page(page)->lru)) -#define PD_PAGE(ptable) (list_entry(ptable, struct page, lru)) -#define PD_MARKBITS(dp) (*(unsigned char *)&PD_PAGE(dp)->index) - -#define PTABLE_SIZE (PTRS_PER_PMD * sizeof(pmd_t)) - -void __init init_pointer_table(unsigned long ptable) -{ - ptable_desc *dp; - unsigned long page = ptable & PAGE_MASK; - unsigned char mask = 1 << ((ptable - page)/PTABLE_SIZE); - - dp = PD_PTABLE(page); - if (!(PD_MARKBITS(dp) & mask)) { - PD_MARKBITS(dp) = 0xff; - list_add(dp, &ptable_list); - } - - PD_MARKBITS(dp) &= ~mask; - pr_debug("init_pointer_table: %lx, %x\n", ptable, PD_MARKBITS(dp)); - - /* unreserve the page so it's possible to free that page */ - __ClearPageReserved(PD_PAGE(dp)); - init_page_count(PD_PAGE(dp)); - - return; -} - -pmd_t *get_pointer_table (void) -{ - ptable_desc *dp = ptable_list.next; - unsigned char mask = PD_MARKBITS (dp); - unsigned char tmp; - unsigned int off; - - /* - * For a pointer table for a user process address space, a - * table is taken from a page allocated for the purpose. Each - * page can hold 8 pointer tables. The page is remapped in - * virtual address space to be noncacheable. - */ - if (mask == 0) { - void *page; - ptable_desc *new; - - if (!(page = (void *)get_zeroed_page(GFP_KERNEL))) - return NULL; - - mmu_page_ctor(page); - - new = PD_PTABLE(page); - PD_MARKBITS(new) = 0xfe; - list_add_tail(new, dp); - - return (pmd_t *)page; - } - - for (tmp = 1, off = 0; (mask & tmp) == 0; tmp <<= 1, off += PTABLE_SIZE) - ; - PD_MARKBITS(dp) = mask & ~tmp; - if (!PD_MARKBITS(dp)) { - /* move to end of list */ - list_move_tail(dp, &ptable_list); - } - return (pmd_t *) (page_address(PD_PAGE(dp)) + off); -} - -int free_pointer_table (pmd_t *ptable) -{ - ptable_desc *dp; - unsigned long page = (unsigned long)ptable & PAGE_MASK; - unsigned char mask = 1 << (((unsigned long)ptable - page)/PTABLE_SIZE); - - dp = PD_PTABLE(page); - if (PD_MARKBITS (dp) & mask) - panic ("table already free!"); - - PD_MARKBITS (dp) |= mask; - - if (PD_MARKBITS(dp) == 0xff) { - /* all tables in page are free, free page */ - list_del(dp); - mmu_page_dtor((void *)page); - free_page (page); - return 1; - } else if (ptable_list.next != dp) { - /* - * move this descriptor to the front of the list, since - * it has one or more free tables. - */ - list_move(dp, &ptable_list); - } - return 0; -} - /* invalidate page in both caches */ static inline void clear040(unsigned long paddr) { diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c index be61f35a7432..2102f9397c94 100644 --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -67,6 +67,108 @@ void mmu_page_dtor(void *page) cache_page(page); } +/* ++andreas: {get,free}_pointer_table rewritten to use unused fields from + struct page instead of separately kmalloced struct. Stolen from + arch/sparc/mm/srmmu.c ... */ + +typedef struct list_head ptable_desc; +static LIST_HEAD(ptable_list); + +#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page(page)->lru)) +#define PD_PAGE(ptable) (list_entry(ptable, struct page, lru)) +#define PD_MARKBITS(dp) (*(unsigned char *)&PD_PAGE(dp)->index) + +#define PTABLE_SIZE (PTRS_PER_PMD * sizeof(pmd_t)) + +void __init init_pointer_table(unsigned long ptable) +{ + ptable_desc *dp; + unsigned long page = ptable & PAGE_MASK; + unsigned char mask = 1 << ((ptable - page)/PTABLE_SIZE); + + dp = PD_PTABLE(page); + if (!(PD_MARKBITS(dp) & mask)) { + PD_MARKBITS(dp) = 0xff; + list_add(dp, &ptable_list); + } + + PD_MARKBITS(dp) &= ~mask; + pr_debug("init_pointer_table: %lx, %x\n", ptable, PD_MARKBITS(dp)); + + /* unreserve the page so it's possible to free that page */ + __ClearPageReserved(PD_PAGE(dp)); + init_page_count(PD_PAGE(dp)); + + return; +} + +pmd_t *get_pointer_table (void) +{ + ptable_desc *dp = ptable_list.next; + unsigned char mask = PD_MARKBITS (dp); + unsigned char tmp; + unsigned int off; + + /* + * For a pointer table for a user process address space, a + * table is taken from a page allocated for the purpose. Each + * page can hold 8 pointer tables. The page is remapped in + * virtual address space to be noncacheable. + */ + if (mask == 0) { + void *page; + ptable_desc *new; + + if (!(page = (void *)get_zeroed_page(GFP_KERNEL))) + return NULL; + + mmu_page_ctor(page); + + new = PD_PTABLE(page); + PD_MARKBITS(new) = 0xfe; + list_add_tail(new, dp); + + return (pmd_t *)page; + } + + for (tmp = 1, off = 0; (mask & tmp) == 0; tmp <<= 1, off += PTABLE_SIZE) + ; + PD_MARKBITS(dp) = mask & ~tmp; + if (!PD_MARKBITS(dp)) { + /* move to end of list */ + list_move_tail(dp, &ptable_list); + } + return (pmd_t *) (page_address(PD_PAGE(dp)) + off); +} + +int free_pointer_table (pmd_t *ptable) +{ + ptable_desc *dp; + unsigned long page = (unsigned long)ptable & PAGE_MASK; + unsigned char mask = 1 << (((unsigned long)ptable - page)/PTABLE_SIZE); + + dp = PD_PTABLE(page); + if (PD_MARKBITS (dp) & mask) + panic ("table already free!"); + + PD_MARKBITS (dp) |= mask; + + if (PD_MARKBITS(dp) == 0xff) { + /* all tables in page are free, free page */ + list_del(dp); + mmu_page_dtor((void *)page); + free_page (page); + return 1; + } else if (ptable_list.next != dp) { + /* + * move this descriptor to the front of the list, since + * it has one or more free tables. + */ + list_move(dp, &ptable_list); + } + return 0; +} + /* size of memory already mapped in head.S */ extern __initdata unsigned long m68k_init_mapped_size; |