This tag contains the core nds32 Linux port(including interrupt controller

driver and timer driver), which has been through 7 rounds of review on mailing
list.

It is able to boot to shell and passes most LTP-2017 testsuites in nds32 AE3XX
platform.
Total Tests: 1901
Total Skipped Tests: 618
Total Failures: 78

Copied below is the ChangeLog that contains the history of this patch set:
Changes in v7:
 - Update cpu binding document to add "andestech,nds32v3" as fallback
 - Remove unnecessary configs of arch/nds32/Kconfig
 - Use GENERIC_CALIBRATE_DELAY
 - Add more help texts for minimum CPU type config
 - Update defconfig because of Kconfig changed and bug fixed
 - Move early_trap_init() declaration to nds32.h
 - Refine dma.c
 - Remove apply_relocate() in module.c and include <linux/moduleloader.h> to catch it
 - Add do_kernel_restart() in machine_restart()
 - Clean up setup.c to remove CONFIG_VGA_CONSOLE and some extern declaration functions
 - Add negative dependency for VGA_CONSOLE on nds32
 - Refine ptrace.c and arch/nds32/include/asm/ptrace.h
 - Refine syscall restart flow and arch/nds32/kernel/signal.c
 - Fix a bug in VDSO
 - Remove the handling for kernel code unaligned accessing
 - Add a description for unaligned access handling in git commit message.
 - Rebase to v4.16-rc1
 - Replace ACCESS_ONCE with READ_ONCE
 - Replace atomic_long_dec(&mm->nr_ptes) with mm_dec_nr_ptes(mm)
 - Remove print_symbol(%s) with printk(%pS)
 - Add bpf_perf_event.h
 - Remove init_stack and init_thread_info

Changes in v6:
 - Refine naming for atl2c
 - Refine ae3xx.dts
 - Remove CONFIG_TIMER_ATCPIT100 in defconfig
 - Refine elf.h
 - Fix a vdso bug
 - Separate arch patchset and timer patchset
 - To select TIMER_OF in drivers/clocksource/Kconfig instead of arch/nds32/Kconfig

Changes in v5:
 - Remove __NR__llseek  and sys_mmap()
 - Add a comment to explain that we don't have clocksource cycle counter in the CPU
 - Add volatile in iounmap()
 - Fix typo Featuretures to Features
 - Replace CPU_CACHE_NONALIASING with !CPU_CACHE_ALIASING
 - Fix a endian bug when we try to get val = of_get_property(cpu,"clock-frequency", NULL)
 - Add screen_info to fix the building error when CONFIG_ VGA_CONSOLE is enabled
 - Remove unnecessary msync()
 - Add depends on !64BIT || BROKEN for faraday Kconfig because the descriptor only supports 32bit
 - Add atl2c binding document
 - Remove unnecessary include headers
 - Fix a vector table bug. It placed wrong vector handlers for 2 exceptions.
 - Fix a vdso bug. It may encounter TLB multi-hit exception because we accidently set it as a global page.
 - Add proper isb and barrier after some cache operations
 - Fix a bug in system call restart flow. $r0 ~ $r5 does not be recovered before restarting system call
 - Fix the build errors for OpenRISC and SPARC because io.h changed.
 - Update ae3xx.dts to support atl2c.

Changes in v4:
 - Add atcpit100 timer driver due to it include vdso implementations and sent
   them together with nds32 may help reviewer to review.
 - Update ae3xx.dts for atcpit100 clock setting and remove vdso settings.
 - To get cycle counter register by timer driver instead of dts.
 - Use "depends on NDS32 || COMPILE_TEST" in atcpit100 driver because it is needed for nds32 vdso
 - Update defconfig becasue kconfig rename from CONFIG_CLKSRC_ATCPIT100 to CONFIG_TIMER_ATCPIT100
 - Remove ag101p.dts because we are not yet ready for ag101p platform.
 - Update copyright style to SPDX-License-Identifier
 - Include <linux/uaccess.h> instead of <asm/uaccess.h>
 - Add local_irq_save()/local_irq_restore() to protect SR_TLB_VPN in update_mmu_cache().
 - Update cpu_dcache_inval_all implementation to make sure all level cache are writeback.

Changes in v3:
 - Use arch's io.h instead of generic one
 - Add andestech-boards binding document
 - Update nds32/cpus.txt binding document
 - Remove atcpit100 timer drivers
 - Select NO_BOOTMEM and delete HAVE_MEMBLOCK_NODE_MAP
 - make CPU_BIG_ENDIAN and CPU_LITTLE_ENDIAN are dependent
 - Add cpu type to select HWZOL/CPU_CACHE_ALIASING
 - Change CPU_CACHE_NONALIASING to CPU_CACHE_ALIASING
 - Remove bootarg from device tree script
 - Update ag101p.dts and ae3xx.dts for correct board name.
 - Clear and simplify defconfig
 - Implement L2C_R_REG/ L2C_W_REG with readl/writel instead of __raw_readl/__raw_writel for endian save
 - Remove early_init_dt_add_memory_arch/early_init_dt_alloc_memory_arch to use the generic ones
 - Refine devicetree.c
 - Fix bug https://lkml.kernel.org/r/1499782590-31366-1-git-send-ema...
 - Refine irqchip/irq-ativic32.c implementations
 - Add COMPILE_TEST in drivers/net/ethernet/faraday/Kconfig
 - Refine cache operations
 - Add CONFIG_HW_SUPPORT_UNALIGNMENT_ACCESS
 - Fix ZERO_PAGE define
 - Remove SA_RESTORER
 - Remove uapi/asm/signal.h
 - Redefine user_pt_regs
 - Remove spinlock.h
 - Remove __ARCH_WANT_RENAMEAT and __ARCH_WANT_SYSCALL_OFF_T from unistd.h
 - Remove set_fs(USER_DS) because flush_old_exec() will do this setting
 - Replace in_atomic() with faulthandler_disabled()
 - Add barrier.h
 - Select COMMON_CLK
 - Add clk_pll in dts
 - Add of_clk_init() in arch/nds32/kernel/time.c

Changes in v2:
 - Set GENERIC_CALIBRATE_DELAY default n
 - Add earlycon support
 - Remove earlyprintk
 - Add CPU_BIG_ENDIAN, CPU_LITTLE_ENDIAN support
 - Refine unalignment access exception handler
 - Add VMSPLIT support
 - Use only one defconfig
 - Change interrupt-cells from 2 to 1
 - Refine andestech cpu names in bindings/nds32/cpus.txt
 - Get clock frequency in dts because fpga bitmap doesn't include this feature
 - Update MAINTAINERS for bindings
 - Remove unused configs in Kconfig
 - Refine device tree scripts
 - Refine coding style
 - Use generic ioremap_nocache
 - Remove L2CC_PA_BASE define and its codes in head.S. It will be moved to bootloader.
 - Set PHYS_OFFSET to 0x0 instead of CONFIG_MEMORY_START
 - Remove unused macros
 - Simplify cpu_cache_* API
 - Change __asm__ __volatile__ to asm volatile
 - Refine uaccess.h
 - Remove unused/deprecated syscall
 - Use generic posix_types.h
 - Remove arch_trace_hardirqs_on/arch_trace_hardirqs_off
 - Fix bug of restart syscall
 - Refine syscall implementations
 - Use IS_ENABLED to replace ifdef as possible
 - Remove device_initcall(nds32_device_probe)
 - Refine vdso implementations
 - Refine copy_from_user()/copy_to_user()/clear_user()/get_user()/memmove()/memcpy()
 - Refine ioremap.c
 - Refine irq-ativic32.c
 - Fix a bug of earlycon.c
 - Export ioremap_nocache/ioremap_uc/ioremap_wc/ioremap_wt
 - Add atcpit100 driver
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