C++ (Cpp) page_phys_addr Examples

Example #1

File: thread.c Project: KarimAllah/Cute

static void virtual_init(struct proc *target, struct proc *source)
{
    /* Create pml4 */
    target->cr3 = page_phys_addr(get_zeroed_page(ZONE_1GB));

    /* For now, only map the kernel 512 Gbyte segment */
    *((struct pml4e *)VIRT(target->cr3) + pml4_index(KERN_PAGE_OFFSET)) =
        *((struct pml4e *)VIRT(source->cr3) + pml4_index(KERN_PAGE_OFFSET));
}

Example #2

File: paging.c Project: Marlinc/andromeda

/**
 * Called when a pagefault occurs, is in charge of fixing the fault and swapping
 * if necessary.
 */
void cPageFault(isrVal_t registers)
{
	addr_t page = getCR2();
	addr_t page_addr = page & ~(0xFFF);

#ifdef PAGEDBG
	printf("PG!\n");
	printf("Fault addr: %X\nPage index: %X\n", page, page_addr);
	printf("Fault type: %X\n", registers.errCode);
	printf("EIP: %X\nESP: %X\nESP: %X\n",
			       registers.eip, registers.procesp, registers.esp);
	printf("eax: %X\tebx: %X\necx: %X\tedx: %X\n",
		    registers.eax, registers.ebx, registers.ecx, registers.edx);
#endif

	if (registers.cs != 0x8 && registers.cs != 0x18)
		panic("Incorrect frame!");
	if (USER(registers.errCode))
		panic("Userspace isn't implemented yet!");
	if (RESERVED(registers.errCode))
		panic("A reserved bit has been set!\n");
	if (PRESENT(registers.errCode))
		panic("Illegal operation!");

	addr_t pd = getPageDir();

	/**
	* The data bit only works if a specific bit is set. See intel docs volume 3
	* for more information.
	*/

	if (DATA(registers.errCode))
	{
#ifdef PAGEDBG
		printf("Trying to access unimplemented data!\n");
#endif
		if (WRITE(registers.errCode))
		{
#ifdef PAGEDBG
		printf("Faulted a write attempt!\n");
		printf("Adding page!\n");
#endif
		if (USER(registers.errCode))
		{
			//Add a user page!
		}
		else
		{
#ifdef PAGEDBG
			printf("Adding a kernel page!\n");
#endif
			if (idx_kernel_space == MAP_NOMAP)
				panic("Kernel page map not correctly initialised!");

			int ret = page_alloc_page
				(idx_kernel_space, page_addr, (void*)pd, FALSE);
			if (ret != -E_SUCCESS)
			{
				printf("ERRCODE: %X\n", -ret);
				panic("Couldn't alloc page!");
			}
#ifdef PAGEDBG
			printf("Phys of %X = %X\n", page, page_phys_addr(page, (void*)pd));
#endif
			}
		}
		else
		{
#ifdef PAGEDBG
			printf("Faulted a read attempt!\n");
#endif
			// Assume the page may be read!
			if (idx_kernel_space == MAP_NOMAP)
			    panic("Kernel page map not correctly initialised!");
			int ret = page_alloc_page(idx_kernel_space, page_addr,
							      (void*)pd, FALSE);
			if (ret != -E_SUCCESS)
			{
				printf("ERRCODE: %X\n", -ret);
				panic("Couldn't alloc page!");
			}
#ifdef PAGEDBG
			printf("Phys of %X = %X\n", page, page_phys_addr(page, (void*)pd));
#endif
		}
	}
	else
	{
#ifdef PAGEDBG
	panic("Trying to run unimplemented code!\n");
#endif
	}
#ifdef UNDEFINED
	printf("Page faults currently under construction!\n");
#endif
}