arch/sh/mm/tlb-pteaex.c

Source file repositories/reference/linux-study-clean/arch/sh/mm/tlb-pteaex.c

File Facts

System
Linux kernel
Corpus path
arch/sh/mm/tlb-pteaex.c
Extension
.c
Size
2803 bytes
Lines
107
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>

void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
	unsigned long flags, pteval, vpn;

	/*
	 * Handle debugger faulting in for debugee.
	 */
	if (vma && current->active_mm != vma->vm_mm)
		return;

	local_irq_save(flags);

	/* Set PTEH register */
	vpn = address & MMU_VPN_MASK;
	__raw_writel(vpn, MMU_PTEH);

	/* Set PTEAEX */
	__raw_writel(get_asid(), MMU_PTEAEX);

	pteval = pte.pte_low;

	/* Set PTEA register */
#ifdef CONFIG_X2TLB
	/*
	 * For the extended mode TLB this is trivial, only the ESZ and
	 * EPR bits need to be written out to PTEA, with the remainder of
	 * the protection bits (with the exception of the compat-mode SZ
	 * and PR bits, which are cleared) being written out in PTEL.
	 */
	__raw_writel(pte.pte_high, MMU_PTEA);
#endif

	/* Set PTEL register */
	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
#ifdef CONFIG_CACHE_WRITETHROUGH
	pteval |= _PAGE_WT;
#endif
	/* conveniently, we want all the software flags to be 0 anyway */
	__raw_writel(pteval, MMU_PTEL);

	/* Load the TLB */
	asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
	local_irq_restore(flags);
}

/*
 * While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
 * data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
 * address arrays. In compat mode the second array is inaccessible, while
 * in extended mode, the legacy 8-bit ASID field in address array 1 has
 * undefined behaviour.
 */
void local_flush_tlb_one(unsigned long asid, unsigned long page)
{
	jump_to_uncached();
	__raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
	__raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
	__raw_writel(page, MMU_ITLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
	__raw_writel(asid, MMU_ITLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
	back_to_cached();
}

void local_flush_tlb_all(void)
{
	unsigned long flags, status;
	int i;

	/*
	 * Flush all the TLB.
	 */
	local_irq_save(flags);
	jump_to_uncached();

	status = __raw_readl(MMUCR);
	status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);

	if (status == 0)
		status = MMUCR_URB_NENTRIES;

	for (i = 0; i < status; i++)
		__raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));

	for (i = 0; i < 4; i++)
		__raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));

Annotation

Implementation Notes