diff options
Diffstat (limited to 'arch/sh/mm/tlb-sh4.c')
| -rw-r--r-- | arch/sh/mm/tlb-sh4.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c new file mode 100644 index 00000000000..115b1b6be40 --- /dev/null +++ b/arch/sh/mm/tlb-sh4.c @@ -0,0 +1,96 @@ +/* + * arch/sh/mm/tlb-sh4.c + * + * SH-4 specific TLB operations + * + * Copyright (C) 1999 Niibe Yutaka + * Copyright (C) 2002 Paul Mundt + * + * Released under the terms of the GNU GPL v2.0. + */ +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/ptrace.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/interrupt.h> + +#include <asm/system.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/pgalloc.h> +#include <asm/mmu_context.h> +#include <asm/cacheflush.h> + +void update_mmu_cache(struct vm_area_struct * vma, + unsigned long address, pte_t pte) +{ + unsigned long flags; + unsigned long pteval; + unsigned long vpn; + struct page *page; + unsigned long pfn; + unsigned long ptea; + + /* Ptrace may call this routine. */ + if (vma && current->active_mm != vma->vm_mm) + return; + + pfn = pte_pfn(pte); + if (pfn_valid(pfn)) { + page = pfn_to_page(pfn); + if (!test_bit(PG_mapped, &page->flags)) { + unsigned long phys = pte_val(pte) & PTE_PHYS_MASK; + __flush_wback_region((void *)P1SEGADDR(phys), PAGE_SIZE); + __set_bit(PG_mapped, &page->flags); + } + } + + local_irq_save(flags); + + /* Set PTEH register */ + vpn = (address & MMU_VPN_MASK) | get_asid(); + ctrl_outl(vpn, MMU_PTEH); + + pteval = pte_val(pte); + /* Set PTEA register */ + /* TODO: make this look less hacky */ + ptea = ((pteval >> 28) & 0xe) | (pteval & 0x1); + ctrl_outl(ptea, MMU_PTEA); + + /* Set PTEL register */ + pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */ +#ifdef CONFIG_SH_WRITETHROUGH + pteval |= _PAGE_WT; +#endif + /* conveniently, we want all the software flags to be 0 anyway */ + ctrl_outl(pteval, MMU_PTEL); + + /* Load the TLB */ + asm volatile("ldtlb": /* no output */ : /* no input */ : "memory"); + local_irq_restore(flags); +} + +void __flush_tlb_page(unsigned long asid, unsigned long page) +{ + unsigned long addr, data; + + /* + * NOTE: PTEH.ASID should be set to this MM + * _AND_ we need to write ASID to the array. + * + * It would be simple if we didn't need to set PTEH.ASID... + */ + addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT; + data = page | asid; /* VALID bit is off */ + jump_to_P2(); + ctrl_outl(data, addr); + back_to_P1(); +} + |