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93 lines
2.0 KiB
93 lines
2.0 KiB
/* |
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* arch/sh/mm/tlb-urb.c |
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* |
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* TLB entry wiring helpers for URB-equipped parts. |
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* |
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* Copyright (C) 2010 Matt Fleming |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/mm.h> |
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#include <linux/io.h> |
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#include <asm/tlb.h> |
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#include <asm/mmu_context.h> |
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/* |
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* Load the entry for 'addr' into the TLB and wire the entry. |
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*/ |
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void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
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{ |
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unsigned long status, flags; |
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int urb; |
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local_irq_save(flags); |
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status = __raw_readl(MMUCR); |
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urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT; |
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status &= ~MMUCR_URC; |
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/* |
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* Make sure we're not trying to wire the last TLB entry slot. |
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*/ |
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BUG_ON(!--urb); |
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urb = urb % MMUCR_URB_NENTRIES; |
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/* |
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* Insert this entry into the highest non-wired TLB slot (via |
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* the URC field). |
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*/ |
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status |= (urb << MMUCR_URC_SHIFT); |
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__raw_writel(status, MMUCR); |
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ctrl_barrier(); |
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/* Load the entry into the TLB */ |
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__update_tlb(vma, addr, pte); |
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/* ... and wire it up. */ |
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status = __raw_readl(MMUCR); |
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status &= ~MMUCR_URB; |
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status |= (urb << MMUCR_URB_SHIFT); |
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__raw_writel(status, MMUCR); |
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ctrl_barrier(); |
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local_irq_restore(flags); |
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} |
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/* |
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* Unwire the last wired TLB entry. |
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* |
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* It should also be noted that it is not possible to wire and unwire |
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* TLB entries in an arbitrary order. If you wire TLB entry N, followed |
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* by entry N+1, you must unwire entry N+1 first, then entry N. In this |
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* respect, it works like a stack or LIFO queue. |
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*/ |
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void tlb_unwire_entry(void) |
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{ |
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unsigned long status, flags; |
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int urb; |
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local_irq_save(flags); |
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status = __raw_readl(MMUCR); |
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urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT; |
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status &= ~MMUCR_URB; |
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/* |
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* Make sure we're not trying to unwire a TLB entry when none |
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* have been wired. |
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*/ |
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BUG_ON(urb++ == MMUCR_URB_NENTRIES); |
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urb = urb % MMUCR_URB_NENTRIES; |
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status |= (urb << MMUCR_URB_SHIFT); |
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__raw_writel(status, MMUCR); |
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ctrl_barrier(); |
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local_irq_restore(flags); |
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}
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