コード例 #1
0
ファイル: mmu.c プロジェクト: ManCheol/kernel
/**
 * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode
 * @from:	The kernel start VA of the range
 * @to:		The kernel end VA of the range (exclusive)
 * @phys_addr:	The physical start address which gets mapped
 *
 * The resulting HYP VA is the same as the kernel VA, modulo
 * HYP_PAGE_OFFSET.
 */
int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
{
	unsigned long start = KERN_TO_HYP((unsigned long)from);
	unsigned long end = KERN_TO_HYP((unsigned long)to);

	/* Check for a valid kernel IO mapping */
	if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
		return -EINVAL;

	return __create_hyp_mappings(hyp_pgd, start, end,
				     __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
}
コード例 #2
0
ファイル: mmu.c プロジェクト: GarysRefererence2014/pmfs
/**
 * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
 * @from:	The virtual kernel start address of the range
 * @to:		The virtual kernel end address of the range (exclusive)
 *
 * The same virtual address as the kernel virtual address is also used
 * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
 * physical pages.
 */
int create_hyp_mappings(void *from, void *to)
{
    unsigned long phys_addr = virt_to_phys(from);
    unsigned long start = KERN_TO_HYP((unsigned long)from);
    unsigned long end = KERN_TO_HYP((unsigned long)to);

    /* Check for a valid kernel memory mapping */
    if (!virt_addr_valid(from) || !virt_addr_valid(to - 1))
        return -EINVAL;

    return __create_hyp_mappings(hyp_pgd, start, end,
                                 __phys_to_pfn(phys_addr), PAGE_HYP);
}
コード例 #3
0
ファイル: mmu.c プロジェクト: ManCheol/kernel
/**
 * free_hyp_pgds - free Hyp-mode page tables
 *
 * Assumes hyp_pgd is a page table used strictly in Hyp-mode and
 * therefore contains either mappings in the kernel memory area (above
 * PAGE_OFFSET), or device mappings in the vmalloc range (from
 * VMALLOC_START to VMALLOC_END).
 *
 * boot_hyp_pgd should only map two pages for the init code.
 */
void free_hyp_pgds(void)
{
	unsigned long addr;

	free_boot_hyp_pgd();

	mutex_lock(&kvm_hyp_pgd_mutex);

	if (hyp_pgd) {
		for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
			unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
		for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
			unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);

		free_pages((unsigned long)hyp_pgd, pgd_order);
		hyp_pgd = NULL;
	}

	mutex_unlock(&kvm_hyp_pgd_mutex);
}
コード例 #4
0
ファイル: mmu.c プロジェクト: ManCheol/kernel
/**
 * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
 * @from:	The virtual kernel start address of the range
 * @to:		The virtual kernel end address of the range (exclusive)
 *
 * The same virtual address as the kernel virtual address is also used
 * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
 * physical pages.
 */
int create_hyp_mappings(void *from, void *to)
{
	phys_addr_t phys_addr;
	unsigned long virt_addr;
	unsigned long start = KERN_TO_HYP((unsigned long)from);
	unsigned long end = KERN_TO_HYP((unsigned long)to);

	start = start & PAGE_MASK;
	end = PAGE_ALIGN(end);

	for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
		int err;

		phys_addr = kvm_kaddr_to_phys(from + virt_addr - start);
		err = __create_hyp_mappings(hyp_pgd, virt_addr,
					    virt_addr + PAGE_SIZE,
					    __phys_to_pfn(phys_addr),
					    PAGE_HYP);
		if (err)
			return err;
	}

	return 0;
}