Merge tag 'microblaze-v5.11' of git://git.monstr.eu/linux-2.6-microblaze

Pull microblaze updates from Michal Simek:
"The biggest change is to remove support for noMMU configuration.

FPGAs are bigger so people use Microblaze with MMU for a lot of years
and there is likely no user of this code anymore. No one is updating
libraries for this configuration either.

- Remove noMMU support

- Add support for TIF_NOTIFY_SIGNAL

- Small header fix"

* tag 'microblaze-v5.11' of git://git.monstr.eu/linux-2.6-microblaze:
microblaze: Remove noMMU code
microblaze: add support for TIF_NOTIFY_SIGNAL
microblaze: Replace <linux/clk-provider.h> by <linux/of_clk.h>

arch/microblaze/Kconfig

···
 	def_bool y
 	select ARCH_32BIT_OFF_T
 	select ARCH_NO_SWAP
-	select ARCH_HAS_BINFMT_FLAT if !MMU
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
-	select ARCH_HAS_DMA_SET_UNCACHED if !MMU
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_TABLE_SORT
 	select TIMER_OF
 	select CLONE_BACKWARDS3
 	select COMMON_CLK
-	select DMA_DIRECT_REMAP if MMU
+	select DMA_DIRECT_REMAP
 	select GENERIC_ATOMIC64
 	select GENERIC_CPU_DEVICES
 	select GENERIC_IDLE_POLL_SETUP
···
 	select TRACING_SUPPORT
 	select VIRT_TO_BUS
 	select CPU_NO_EFFICIENT_FFS
-	select MMU_GATHER_NO_RANGE if MMU
+	select MMU_GATHER_NO_RANGE
 	select SPARSE_IRQ
 	select SET_FS
 
···
 source "kernel/Kconfig.hz"
 
 config MMU
-	bool "MMU support"
-	default n
+	def_bool y
 
 comment "Boot options"
 
···
 comment "Default settings for advanced configuration options are used"
 	depends on !ADVANCED_OPTIONS
 
-config XILINX_UNCACHED_SHADOW
-	bool "Are you using uncached shadow for RAM ?"
-	depends on ADVANCED_OPTIONS && !MMU
-	default n
-	help
-	  This is needed to be able to allocate uncachable memory regions.
-	  The feature requires the design to define the RAM memory controller
-	  window to be twice as large as the actual physical memory.
-
 config HIGHMEM
 	bool "High memory support"
-	depends on MMU
 	select KMAP_LOCAL
 	help
 	  The address space of Microblaze processors is only 4 Gigabytes large
···
 
 config LOWMEM_SIZE_BOOL
 	bool "Set maximum low memory"
-	depends on ADVANCED_OPTIONS && MMU
+	depends on ADVANCED_OPTIONS
 	help
 	  This option allows you to set the maximum amount of memory which
 	  will be used as "low memory", that is, memory which the kernel can
···
 
 config KERNEL_START
 	hex "Virtual address of kernel base" if KERNEL_START_BOOL
-	default "0xc0000000" if MMU
-	default KERNEL_BASE_ADDR if !MMU
+	default "0xc0000000"
 
 config TASK_SIZE_BOOL
 	bool "Set custom user task size"
-	depends on ADVANCED_OPTIONS && MMU
+	depends on ADVANCED_OPTIONS
 	help
 	  This option allows you to set the amount of virtual address space
 	  allocated to user tasks.  This can be useful in optimizing the
···
 config TASK_SIZE
 	hex "Size of user task space" if TASK_SIZE_BOOL
 	default "0x80000000"
-
-choice
-	prompt "Page size"
-	default MICROBLAZE_4K_PAGES
-	depends on ADVANCED_OPTIONS && !MMU
-	help
-	  Select the kernel logical page size. Increasing the page size
-	  will reduce software overhead at each page boundary, allow
-	  hardware prefetch mechanisms to be more effective, and allow
-	  larger dma transfers increasing IO efficiency and reducing
-	  overhead. However the utilization of memory will increase.
-	  For example, each cached file will using a multiple of the
-	  page size to hold its contents and the difference between the
-	  end of file and the end of page is wasted.
-
-	  If unsure, choose 4K_PAGES.
-
-config MICROBLAZE_4K_PAGES
-	bool "4k page size"
-
-config MICROBLAZE_16K_PAGES
-	bool "16k page size"
-
-config MICROBLAZE_64K_PAGES
-	bool "64k page size"
-
-endchoice
 
 endmenu
 

arch/microblaze/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
 KBUILD_DEFCONFIG := mmu_defconfig
 
-ifeq ($(CONFIG_MMU),y)
 UTS_SYSNAME = -DUTS_SYSNAME=\"Linux\"
-else
-UTS_SYSNAME = -DUTS_SYSNAME=\"uClinux\"
-endif
 
 # What CPU vesion are we building for, and crack it open
 # as major.minor.rev
···
 
 core-y	+= $(boot)/dts/
 
-# defines filename extension depending memory management type
-ifeq ($(CONFIG_MMU),)
-MMU := -nommu
-endif
-
-export MMU DTB
+export DTB
 
 all: linux.bin
 

arch/microblaze/configs/mmu_defconfig

···
 CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=2
 CONFIG_XILINX_MICROBLAZE0_USE_FPU=2
 CONFIG_HZ_100=y
-CONFIG_MMU=y
 CONFIG_CMDLINE_BOOL=y
 CONFIG_CMDLINE_FORCE=y
 CONFIG_HIGHMEM=y

arch/microblaze/configs/nommu_defconfig

···
-CONFIG_SYSVIPC=y
-CONFIG_POSIX_MQUEUE=y
-CONFIG_AUDIT=y
-CONFIG_BSD_PROCESS_ACCT=y
-CONFIG_BSD_PROCESS_ACCT_V3=y
-CONFIG_IKCONFIG=y
-CONFIG_IKCONFIG_PROC=y
-CONFIG_SYSFS_DEPRECATED=y
-CONFIG_SYSFS_DEPRECATED_V2=y
-# CONFIG_BASE_FULL is not set
-CONFIG_KALLSYMS_ALL=y
-CONFIG_EMBEDDED=y
-CONFIG_SLAB=y
-CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR=1
-CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR=1
-CONFIG_XILINX_MICROBLAZE0_USE_BARREL=1
-CONFIG_XILINX_MICROBLAZE0_USE_DIV=1
-CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=2
-CONFIG_XILINX_MICROBLAZE0_USE_FPU=2
-CONFIG_HZ_100=y
-CONFIG_CMDLINE_BOOL=y
-CONFIG_CMDLINE_FORCE=y
-CONFIG_PCI_XILINX=y
-CONFIG_MODULES=y
-CONFIG_MODULE_UNLOAD=y
-# CONFIG_BLK_DEV_BSG is not set
-CONFIG_PARTITION_ADVANCED=y
-# CONFIG_EFI_PARTITION is not set
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_INET=y
-# CONFIG_IPV6 is not set
-CONFIG_PCI=y
-CONFIG_MTD=y
-CONFIG_MTD_CMDLINE_PARTS=y
-CONFIG_MTD_BLOCK=y
-CONFIG_MTD_CFI=y
-CONFIG_MTD_CFI_INTELEXT=y
-CONFIG_MTD_CFI_AMDSTD=y
-CONFIG_MTD_RAM=y
-CONFIG_MTD_UCLINUX=y
-CONFIG_BLK_DEV_RAM=y
-CONFIG_BLK_DEV_RAM_SIZE=8192
-CONFIG_NETDEVICES=y
-CONFIG_XILINX_EMACLITE=y
-CONFIG_XILINX_LL_TEMAC=y
-# CONFIG_INPUT is not set
-# CONFIG_SERIO is not set
-# CONFIG_VT is not set
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
-CONFIG_SERIAL_OF_PLATFORM=y
-CONFIG_SERIAL_UARTLITE=y
-CONFIG_SERIAL_UARTLITE_CONSOLE=y
-# CONFIG_HW_RANDOM is not set
-CONFIG_XILINX_HWICAP=y
-CONFIG_I2C=y
-CONFIG_I2C_XILINX=y
-CONFIG_SPI=y
-CONFIG_SPI_XILINX=y
-CONFIG_GPIOLIB=y
-CONFIG_GPIO_SYSFS=y
-CONFIG_GPIO_XILINX=y
-CONFIG_POWER_RESET=y
-CONFIG_POWER_RESET_GPIO_RESTART=y
-# CONFIG_HWMON is not set
-CONFIG_WATCHDOG=y
-CONFIG_XILINX_WATCHDOG=y
-CONFIG_FB=y
-CONFIG_FB_XILINX=y
-# CONFIG_USB_SUPPORT is not set
-CONFIG_EXT3_FS=y
-# CONFIG_DNOTIFY is not set
-CONFIG_CRAMFS=y
-CONFIG_ROMFS_FS=y
-CONFIG_NFS_FS=y
-CONFIG_NFS_V3_ACL=y
-CONFIG_NLS=y
-CONFIG_KEYS=y
-CONFIG_ENCRYPTED_KEYS=y
-CONFIG_CRYPTO_ECB=y
-CONFIG_CRYPTO_MD4=y
-CONFIG_CRYPTO_MD5=y
-CONFIG_CRYPTO_ARC4=y
-CONFIG_CRYPTO_DES=y
-CONFIG_DEBUG_INFO=y
-CONFIG_DEBUG_SLAB=y
-CONFIG_DETECT_HUNG_TASK=y
-CONFIG_DEBUG_SPINLOCK=y

arch/microblaze/include/asm/dma.h

···
 #ifndef _ASM_MICROBLAZE_DMA_H
 #define _ASM_MICROBLAZE_DMA_H
 
-#ifndef CONFIG_MMU
-/* we don't have dma address limit. define it as zero to be
- * unlimited. */
-#define MAX_DMA_ADDRESS		(0)
-#else
 /* Virtual address corresponding to last available physical memory address.  */
 #define MAX_DMA_ADDRESS (CONFIG_KERNEL_START + memory_size - 1)
-#endif
 
 #ifdef CONFIG_PCI
 extern int isa_dma_bridge_buggy;

arch/microblaze/include/asm/exceptions.h

···
 #define _ASM_MICROBLAZE_EXCEPTIONS_H
 
 #ifdef __KERNEL__
-
-#ifndef CONFIG_MMU
-#define EX_HANDLER_STACK_SIZ	(4*19)
-#endif
-
 #ifndef __ASSEMBLY__
 
 /* Macros to enable and disable HW exceptions in the MSR */

arch/microblaze/include/asm/io.h

···
 #define PCI_IOBASE	((void __iomem *)_IO_BASE)
 #define IO_SPACE_LIMIT (0xFFFFFFFF)
 
-#ifdef CONFIG_MMU
 #define page_to_bus(page)	(page_to_phys(page))
 
 extern void iounmap(volatile void __iomem *addr);
 
 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
-
-#endif /* CONFIG_MMU */
 
 /* Big Endian */
 #define out_be32(a, v) __raw_writel((v), (void __iomem __force *)(a))

arch/microblaze/include/asm/mmu.h

···
 #ifndef _ASM_MICROBLAZE_MMU_H
 #define _ASM_MICROBLAZE_MMU_H
 
-# ifndef CONFIG_MMU
-#  include <asm-generic/mmu.h>
-# else /* CONFIG_MMU */
 #  ifdef __KERNEL__
 #   ifndef __ASSEMBLY__
 
···
 #  define TLB_G			0x00000001 /* Memory is guarded from prefetch */
 
 #  endif /* __KERNEL__ */
-# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_MMU_H */

arch/microblaze/include/asm/mmu_context.h

···
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifdef CONFIG_MMU
 # include <asm/mmu_context_mm.h>
-#else
-# include <asm-generic/nommu_context.h>
-#endif

arch/microblaze/include/asm/page.h

···
 #ifdef __KERNEL__
 
 /* PAGE_SHIFT determines the page size */
-#if defined(CONFIG_MICROBLAZE_64K_PAGES)
-#define PAGE_SHIFT		16
-#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
-#define PAGE_SHIFT		14
-#else
 #define PAGE_SHIFT		12
-#endif
 #define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
 #define PAGE_MASK	(~(PAGE_SIZE-1))
 
···
 #define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
 #define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))
 
-#ifndef CONFIG_MMU
-/*
- * PAGE_OFFSET -- the first address of the first page of memory. When not
- * using MMU this corresponds to the first free page in physical memory (aligned
- * on a page boundary).
- */
-extern unsigned int __page_offset;
-#define PAGE_OFFSET __page_offset
-
-#else /* CONFIG_MMU */
-
 /*
  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  * it is set to the kernel start address (aligned on a page boundary).
···
 typedef unsigned long pte_basic_t;
 #define PTE_FMT		"%.8lx"
 
-#endif /* CONFIG_MMU */
-
 # define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
 # define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)
 
···
 typedef struct { unsigned long	pte; }		pte_t;
 typedef struct { unsigned long	pgprot; }	pgprot_t;
 /* FIXME this can depend on linux kernel version */
-#   ifdef CONFIG_MMU
 typedef struct { unsigned long pgd; } pgd_t;
-#   else /* CONFIG_MMU */
-typedef struct { unsigned long	ste[64]; }	pmd_t;
-typedef struct { pmd_t		pue[1]; }	pud_t;
-typedef struct { pud_t		p4e[1]; }	p4d_t;
-typedef struct { p4d_t		pge[1]; }	pgd_t;
-#   endif /* CONFIG_MMU */
 
 # define pte_val(x)	((x).pte)
 # define pgprot_val(x)	((x).pgprot)
 
-#   ifdef CONFIG_MMU
 #   define pgd_val(x)      ((x).pgd)
-#   else  /* CONFIG_MMU */
-#   define pmd_val(x)	((x).ste[0])
-#   define pud_val(x)	((x).pue[0])
-#   define pgd_val(x)	((x).pge[0])
-#   endif  /* CONFIG_MMU */
 
 # define __pte(x)	((pte_t) { (x) })
 # define __pgd(x)	((pgd_t) { (x) })
···
 # define virt_to_pfn(vaddr)	(phys_to_pfn((__pa(vaddr))))
 # define pfn_to_virt(pfn)	__va(pfn_to_phys((pfn)))
 
-#  ifdef CONFIG_MMU
-
 #  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 
-#  else /* CONFIG_MMU */
-#  define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
-#  define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
-#  define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
-#  define page_to_bus(page)	(page_to_phys(page))
-#  define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
-#  endif /* CONFIG_MMU */
-
-#  ifndef CONFIG_MMU
-#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
-				((pfn) <= (min_low_pfn + max_mapnr)))
-#  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
-#  else /* CONFIG_MMU */
 #  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
 #  define pfn_valid(pfn)	((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
-#  endif /* CONFIG_MMU */
 
 # endif /* __ASSEMBLY__ */
 
···
 
 /* Convert between virtual and physical address for MMU. */
 /* Handle MicroBlaze processor with virtual memory. */
-#ifndef CONFIG_MMU
-#define __virt_to_phys(addr)	addr
-#define __phys_to_virt(addr)	addr
-#define tophys(rd, rs)	addik rd, rs, 0
-#define tovirt(rd, rs)	addik rd, rs, 0
-#else
 #define __virt_to_phys(addr) \
 	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 #define __phys_to_virt(addr) \
···
 	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 #define tovirt(rd, rs) \
 	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
-#endif /* CONFIG_MMU */
 
 #define TOPHYS(addr)  __virt_to_phys(addr)
-
-#ifdef CONFIG_MMU
-
-#endif /* CONFIG_MMU */
 
 #endif /* __KERNEL__ */
 

arch/microblaze/include/asm/pgalloc.h

···
 #ifndef _ASM_MICROBLAZE_PGALLOC_H
 #define _ASM_MICROBLAZE_PGALLOC_H
 
-#ifdef CONFIG_MMU
-
 #include <linux/kernel.h>	/* For min/max macros */
 #include <linux/highmem.h>
 #include <linux/pgtable.h>
···
 
 #define pmd_populate_kernel(mm, pmd, pte) \
 		(pmd_val(*(pmd)) = (unsigned long) (pte))
-
-#endif /* CONFIG_MMU */
 
 #endif /* _ASM_MICROBLAZE_PGALLOC_H */

arch/microblaze/include/asm/pgtable.h

···
 extern int mem_init_done;
 #endif
 
-#ifndef CONFIG_MMU
-
-#define pgd_present(pgd)	(1) /* pages are always present on non MMU */
-#define pgd_none(pgd)		(0)
-#define pgd_bad(pgd)		(0)
-#define pgd_clear(pgdp)
-#define kern_addr_valid(addr)	(1)
-
-#define PAGE_NONE		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_SHARED		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_COPY		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_READONLY		__pgprot(0) /* these mean nothing to non MMU */
-#define PAGE_KERNEL		__pgprot(0) /* these mean nothing to non MMU */
-
-#define pgprot_noncached(x)	(x)
-#define pgprot_writecombine	pgprot_noncached
-#define pgprot_device		pgprot_noncached
-
-#define __swp_type(x)		(0)
-#define __swp_offset(x)		(0)
-#define __swp_entry(typ, off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
-#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
-#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
-
-#define ZERO_PAGE(vaddr)	({ BUG(); NULL; })
-
-#define swapper_pg_dir ((pgd_t *) NULL)
-
-#define arch_enter_lazy_cpu_mode()	do {} while (0)
-
-#define pgprot_noncached_wc(prot)	prot
-
-/*
- * All 32bit addresses are effectively valid for vmalloc...
- * Sort of meaningless for non-VM targets.
- */
-#define	VMALLOC_START	0
-#define	VMALLOC_END	0xffffffff
-
-#else /* CONFIG_MMU */
-
 #include <asm-generic/pgtable-nopmd.h>
 
 #ifdef __KERNEL__
···
 
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
-
-#endif /* CONFIG_MMU */
 
 #ifndef __ASSEMBLY__
 extern unsigned long ioremap_bot, ioremap_base;

arch/microblaze/include/asm/processor.h

···
 
 # endif /* __ASSEMBLY__ */
 
-# ifndef CONFIG_MMU
-/*
- * User space process size: memory size
- *
- * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
- * user processes and the kernel is on the same memory region. They
- * both share the memory space and that is limited by the amount of
- * physical memory. thus, we set TASK_SIZE == amount of total memory.
- */
-# define TASK_SIZE	(0x81000000 - 0x80000000)
-
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's. We won't be using it
- */
-# define TASK_UNMAPPED_BASE	0
-
-/* definition in include/linux/sched.h */
-struct task_struct;
-
-/* thread_struct is gone. use thread_info instead. */
-struct thread_struct { };
-# define INIT_THREAD	{ }
-
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
-extern unsigned long get_wchan(struct task_struct *p);
-
-# define KSTK_EIP(tsk)	(0)
-# define KSTK_ESP(tsk)	(0)
-
-# else /* CONFIG_MMU */
-
 /*
  * This is used to define STACK_TOP, and with MMU it must be below
  * kernel base to select the correct PGD when handling MMU exceptions.
···
 #endif
 
 #  endif /* __ASSEMBLY__ */
-# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */

arch/microblaze/include/asm/registers.h

···
 #define FSR_UF		(1<<1) /* Underflow */
 #define FSR_DO		(1<<0) /* Denormalized operand error */
 
-# ifdef CONFIG_MMU
 /* Machine State Register (MSR) Fields */
 # define MSR_UM		(1<<11) /* User Mode */
 # define MSR_UMS	(1<<12) /* User Mode Save */
···
 # define	  ESR_DIZ	(1<<11) /* Zone Protection */
 # define	  ESR_S		(1<<10) /* Store instruction */
 
-# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_REGISTERS_H */

arch/microblaze/include/asm/setup.h

···
 
 extern char *klimit;
 
-#   ifdef CONFIG_MMU
 extern void mmu_reset(void);
-#   endif /* CONFIG_MMU */
 
 void time_init(void);
 void init_IRQ(void);

arch/microblaze/include/asm/thread_info.h

···
 #define TIF_NEED_RESCHED	3 /* rescheduling necessary */
 /* restore singlestep on return to user mode */
 #define TIF_SINGLESTEP		4
+#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
 #define TIF_MEMDIE		6	/* is terminating due to OOM killer */
 #define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
 #define TIF_SECCOMP		10      /* secure computing */
···
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)

arch/microblaze/include/asm/tlbflush.h

···
 #ifndef _ASM_MICROBLAZE_TLBFLUSH_H
 #define _ASM_MICROBLAZE_TLBFLUSH_H
 
-#ifdef CONFIG_MMU
-
 #include <linux/sched.h>
 #include <linux/threads.h>
 #include <asm/processor.h>	/* For TASK_SIZE */
···
  */
 static inline void flush_tlb_pgtables(struct mm_struct *mm,
 	unsigned long start, unsigned long end) { }
-
-#else /* CONFIG_MMU */
-
-#define flush_tlb()				BUG()
-#define flush_tlb_all()				BUG()
-#define flush_tlb_mm(mm)			BUG()
-#define flush_tlb_page(vma, addr)		BUG()
-#define flush_tlb_range(mm, start, end)		BUG()
-#define flush_tlb_pgtables(mm, start, end)	BUG()
-#define flush_tlb_kernel_range(start, end)	BUG()
-
-#endif /* CONFIG_MMU */
 
 #endif /* _ASM_MICROBLAZE_TLBFLUSH_H */

arch/microblaze/include/asm/uaccess.h

···
  */
 # define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })
 
-#  ifndef CONFIG_MMU
-#  define KERNEL_DS	MAKE_MM_SEG(0)
-#  define USER_DS	KERNEL_DS
-#  else
 #  define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
 #  define USER_DS	MAKE_MM_SEG(TASK_SIZE - 1)
-#  endif
 
 # define get_fs()	(current_thread_info()->addr_limit)
 # define set_fs(val)	(current_thread_info()->addr_limit = (val))
 
 # define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)
-
-#ifndef CONFIG_MMU
-
-/* Check against bounds of physical memory */
-static inline int ___range_ok(unsigned long addr, unsigned long size)
-{
-	return ((addr < memory_start) ||
-		((addr + size - 1) > (memory_start + memory_size - 1)));
-}
-
-#define __range_ok(addr, size) \
-		___range_ok((unsigned long)(addr), (unsigned long)(size))
-
-#define access_ok(addr, size) (__range_ok((addr), (size)) == 0)
-
-#else
 
 static inline int access_ok(const void __user *addr, unsigned long size)
 {
···
 			(u32)get_fs().seg);
 	return 1;
 }
-#endif
 
-#ifdef CONFIG_MMU
 # define __FIXUP_SECTION	".section .fixup,\"ax\"\n"
 # define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"
-#else
-# define __FIXUP_SECTION	".section .discard,\"ax\"\n"
-# define __EX_TABLE_SECTION	".section .discard,\"ax\"\n"
-#endif
 
 extern unsigned long __copy_tofrom_user(void __user *to,
 		const void __user *from, unsigned long size);

arch/microblaze/kernel/Makefile

···
 obj-y += cpu/
 
 obj-$(CONFIG_MODULES)		+= microblaze_ksyms.o module.o
-obj-$(CONFIG_MMU)		+= misc.o
+obj-y				+= misc.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace.o mcount.o
 obj-$(CONFIG_KGDB)		+= kgdb.o
 
-obj-y	+= entry$(MMU).o
+obj-y	+= entry.o

arch/microblaze/kernel/asm-offsets.c

···
 
 	/* struct task_struct */
 	DEFINE(TS_THREAD_INFO, offsetof(struct task_struct, stack));
-#ifdef CONFIG_MMU
 	DEFINE(TASK_STATE, offsetof(struct task_struct, state));
 	DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
 	DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
···
 
 	DEFINE(PGDIR, offsetof(struct thread_struct, pgdir));
 	BLANK();
-#endif
 
 	/* struct thread_info */
 	DEFINE(TI_TASK, offsetof(struct thread_info, task));

arch/microblaze/kernel/entry-nommu.S

···
-/*
- * Copyright (C) 2007-2009 Michal Simek <[e-mail]>
- * Copyright (C) 2007-2009 PetaLogix
- * Copyright (C) 2006 Atmark Techno, Inc.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/linkage.h>
-#include <asm/thread_info.h>
-#include <linux/errno.h>
-#include <asm/entry.h>
-#include <asm/asm-offsets.h>
-#include <asm/registers.h>
-#include <asm/unistd.h>
-#include <asm/percpu.h>
-#include <asm/signal.h>
-
-#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
-	.macro	disable_irq
-	msrclr r0, MSR_IE
-	.endm
-
-	.macro	enable_irq
-	msrset r0, MSR_IE
-	.endm
-
-	.macro	clear_bip
-	msrclr r0, MSR_BIP
-	.endm
-#else
-	.macro	disable_irq
-	mfs r11, rmsr
-	andi r11, r11, ~MSR_IE
-	mts rmsr, r11
-	.endm
-
-	.macro	enable_irq
-	mfs r11, rmsr
-	ori r11, r11, MSR_IE
-	mts rmsr, r11
-	.endm
-
-	.macro	clear_bip
-	mfs r11, rmsr
-	andi r11, r11, ~MSR_BIP
-	mts rmsr, r11
-	.endm
-#endif
-
-ENTRY(_interrupt)
-	swi	r1, r0, PER_CPU(ENTRY_SP)	/* save the current sp */
-	swi	r11, r0, PER_CPU(R11_SAVE)	/* temporarily save r11 */
-	lwi	r11, r0, PER_CPU(KM)		/* load mode indicator */
-	beqid	r11, 1f
-	nop
-	brid	2f				/* jump over */
-	addik	r1, r1, (-PT_SIZE)	/* room for pt_regs (delay slot) */
-1:						/* switch to kernel stack */
-	lwi	r1, r0, PER_CPU(CURRENT_SAVE)	/* get the saved current */
-	lwi	r1, r1, TS_THREAD_INFO		/* get the thread info */
-	/* calculate kernel stack pointer */
-	addik	r1, r1, THREAD_SIZE - PT_SIZE
-2:
-	swi	r11, r1, PT_MODE		/* store the mode */
-	lwi	r11, r0, PER_CPU(R11_SAVE)	/* reload r11 */
-	swi	r2, r1, PT_R2
-	swi	r3, r1, PT_R3
-	swi	r4, r1, PT_R4
-	swi	r5, r1, PT_R5
-	swi	r6, r1, PT_R6
-	swi	r7, r1, PT_R7
-	swi	r8, r1, PT_R8
-	swi	r9, r1, PT_R9
-	swi	r10, r1, PT_R10
-	swi	r11, r1, PT_R11
-	swi	r12, r1, PT_R12
-	swi	r13, r1, PT_R13
-	swi	r14, r1, PT_R14
-	swi	r14, r1, PT_PC
-	swi	r15, r1, PT_R15
-	swi	r16, r1, PT_R16
-	swi	r17, r1, PT_R17
-	swi	r18, r1, PT_R18
-	swi	r19, r1, PT_R19
-	swi	r20, r1, PT_R20
-	swi	r21, r1, PT_R21
-	swi	r22, r1, PT_R22
-	swi	r23, r1, PT_R23
-	swi	r24, r1, PT_R24
-	swi	r25, r1, PT_R25
-	swi	r26, r1, PT_R26
-	swi	r27, r1, PT_R27
-	swi	r28, r1, PT_R28
-	swi	r29, r1, PT_R29
-	swi	r30, r1, PT_R30
-	swi	r31, r1, PT_R31
-	/* special purpose registers */
-	mfs	r11, rmsr
-	swi	r11, r1, PT_MSR
-	mfs	r11, rear
-	swi	r11, r1, PT_EAR
-	mfs	r11, resr
-	swi	r11, r1, PT_ESR
-	mfs	r11, rfsr
-	swi	r11, r1, PT_FSR
-	/* reload original stack pointer and save it */
-	lwi	r11, r0, PER_CPU(ENTRY_SP)
-	swi	r11, r1, PT_R1
-	/* update mode indicator we are in kernel mode */
-	addik	r11, r0, 1
-	swi	r11, r0, PER_CPU(KM)
-	/* restore r31 */
-	lwi	r31, r0, PER_CPU(CURRENT_SAVE)
-	/* prepare the link register, the argument and jump */
-	addik	r15, r0, ret_from_intr - 8
-	addk	r6, r0, r15
-	braid	do_IRQ
-	add	r5, r0, r1
-
-ret_from_intr:
-	lwi	r11, r1, PT_MODE
-	bneid	r11, no_intr_resched
-
-3:
-	lwi	r6, r31, TS_THREAD_INFO	/* get thread info */
-	lwi	r19, r6, TI_FLAGS	/* get flags in thread info */
-				/* do an extra work if any bits are set */
-
-	andi	r11, r19, _TIF_NEED_RESCHED
-	beqi	r11, 1f
-	bralid	r15, schedule
-	nop
-	bri	3b
-1:	andi	r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME
-	beqid	r11, no_intr_resched
-	addk	r5, r1, r0
-	bralid	r15, do_notify_resume
-	addk	r6, r0, r0
-	bri	3b
-
-no_intr_resched:
-	/* Disable interrupts, we are now committed to the state restore */
-	disable_irq
-
-	/* save mode indicator */
-	lwi	r11, r1, PT_MODE
-	swi	r11, r0, PER_CPU(KM)
-
-	/* save r31 */
-	swi	r31, r0, PER_CPU(CURRENT_SAVE)
-restore_context:
-	/* special purpose registers */
-	lwi	r11, r1, PT_FSR
-	mts	rfsr, r11
-	lwi	r11, r1, PT_ESR
-	mts	resr, r11
-	lwi	r11, r1, PT_EAR
-	mts	rear, r11
-	lwi	r11, r1, PT_MSR
-	mts	rmsr, r11
-
-	lwi	r31, r1, PT_R31
-	lwi	r30, r1, PT_R30
-	lwi	r29, r1, PT_R29
-	lwi	r28, r1, PT_R28
-	lwi	r27, r1, PT_R27
-	lwi	r26, r1, PT_R26
-	lwi	r25, r1, PT_R25
-	lwi	r24, r1, PT_R24
-	lwi	r23, r1, PT_R23
-	lwi	r22, r1, PT_R22
-	lwi	r21, r1, PT_R21
-	lwi	r20, r1, PT_R20
-	lwi	r19, r1, PT_R19
-	lwi	r18, r1, PT_R18
-	lwi	r17, r1, PT_R17
-	lwi	r16, r1, PT_R16
-	lwi	r15, r1, PT_R15
-	lwi	r14, r1, PT_PC
-	lwi	r13, r1, PT_R13
-	lwi	r12, r1, PT_R12
-	lwi	r11, r1, PT_R11
-	lwi	r10, r1, PT_R10
-	lwi	r9, r1, PT_R9
-	lwi	r8, r1, PT_R8
-	lwi	r7, r1, PT_R7
-	lwi	r6, r1, PT_R6
-	lwi	r5, r1, PT_R5
-	lwi	r4, r1, PT_R4
-	lwi	r3, r1, PT_R3
-	lwi	r2, r1, PT_R2
-	lwi	r1, r1, PT_R1
-	rtid	r14, 0
-	nop
-
-ENTRY(_reset)
-	brai	0;
-
-ENTRY(_user_exception)
-	swi	r1, r0, PER_CPU(ENTRY_SP)	/* save the current sp */
-	swi	r11, r0, PER_CPU(R11_SAVE)	/* temporarily save r11 */
-	lwi	r11, r0, PER_CPU(KM)		/* load mode indicator */
-	beqid	r11, 1f				/* Already in kernel mode? */
-	nop
-	brid	2f				/* jump over */
-	addik	r1, r1, (-PT_SIZE)	/* Room for pt_regs (delay slot) */
-1:						/* Switch to kernel stack */
-	lwi	r1, r0, PER_CPU(CURRENT_SAVE)	/* get the saved current */
-	lwi	r1, r1, TS_THREAD_INFO		/* get the thread info */
-	/* calculate kernel stack pointer */
-	addik	r1, r1, THREAD_SIZE - PT_SIZE
-2:
-	swi	r11, r1, PT_MODE		/* store the mode */
-	lwi	r11, r0, PER_CPU(R11_SAVE)	/* reload r11 */
-	/* save them on stack */
-	swi	r2, r1, PT_R2
-	swi	r3, r1, PT_R3 /* r3: _always_ in clobber list; see unistd.h */
-	swi	r4, r1, PT_R4 /* r4: _always_ in clobber list; see unistd.h */
-	swi	r5, r1, PT_R5
-	swi	r6, r1, PT_R6
-	swi	r7, r1, PT_R7
-	swi	r8, r1, PT_R8
-	swi	r9, r1, PT_R9
-	swi	r10, r1, PT_R10
-	swi	r11, r1, PT_R11
-	/* r12: _always_ in clobber list; see unistd.h */
-	swi	r12, r1, PT_R12
-	swi	r13, r1, PT_R13
-	/* r14: _always_ in clobber list; see unistd.h */
-	swi	r14, r1, PT_R14
-	/* but we want to return to the next inst. */
-	addik	r14, r14, 0x4
-	swi	r14, r1, PT_PC		/* increment by 4 and store in pc */
-	swi	r15, r1, PT_R15
-	swi	r16, r1, PT_R16
-	swi	r17, r1, PT_R17
-	swi	r18, r1, PT_R18
-	swi	r19, r1, PT_R19
-	swi	r20, r1, PT_R20
-	swi	r21, r1, PT_R21
-	swi	r22, r1, PT_R22
-	swi	r23, r1, PT_R23
-	swi	r24, r1, PT_R24
-	swi	r25, r1, PT_R25
-	swi	r26, r1, PT_R26
-	swi	r27, r1, PT_R27
-	swi	r28, r1, PT_R28
-	swi	r29, r1, PT_R29
-	swi	r30, r1, PT_R30
-	swi	r31, r1, PT_R31
-
-	disable_irq
-	nop		/* make sure IE bit is in effect */
-	clear_bip	/* once IE is in effect it is safe to clear BIP */
-	nop
-
-	/* special purpose registers */
-	mfs	r11, rmsr
-	swi	r11, r1, PT_MSR
-	mfs	r11, rear
-	swi	r11, r1, PT_EAR
-	mfs	r11, resr
-	swi	r11, r1, PT_ESR
-	mfs	r11, rfsr
-	swi	r11, r1, PT_FSR
-	/* reload original stack pointer and save it */
-	lwi	r11, r0, PER_CPU(ENTRY_SP)
-	swi	r11, r1, PT_R1
-	/* update mode indicator we are in kernel mode */
-	addik	r11, r0, 1
-	swi	r11, r0, PER_CPU(KM)
-	/* restore r31 */
-	lwi	r31, r0, PER_CPU(CURRENT_SAVE)
-	/* re-enable interrupts now we are in kernel mode */
-	enable_irq
-
-	/* See if the system call number is valid. */
-	addi	r11, r12, -__NR_syscalls
-	bgei	r11, 1f			/* return to user if not valid */
-	/* Figure out which function to use for this system call. */
-	/* Note Microblaze barrel shift is optional, so don't rely on it */
-	add	r12, r12, r12			/* convert num -> ptr */
-	addik	r30, r0, 1			/* restarts allowed */
-	add	r12, r12, r12
-	lwi	r12, r12, sys_call_table	/* Get function pointer */
-	addik	r15, r0, ret_to_user-8		/* set return address */
-	bra	r12				/* Make the system call. */
-	bri	0				/* won't reach here */
-1:
-	brid	ret_to_user			/* jump to syscall epilogue */
-	addi	r3, r0, -ENOSYS			/* set errno in delay slot */
-
-/*
- * Debug traps are like a system call, but entered via brki r14, 0x60
- * All we need to do is send the SIGTRAP signal to current, ptrace and
- * do_notify_resume will handle the rest
- */
-ENTRY(_debug_exception)
-	swi	r1, r0, PER_CPU(ENTRY_SP)	/* save the current sp */
-	lwi	r1, r0, PER_CPU(CURRENT_SAVE)	/* get the saved current */
-	lwi	r1, r1, TS_THREAD_INFO		/* get the thread info */
-	addik	r1, r1, THREAD_SIZE - PT_SIZE	/* get the kernel stack */
-	swi	r11, r0, PER_CPU(R11_SAVE)	/* temporarily save r11 */
-	lwi	r11, r0, PER_CPU(KM)		/* load mode indicator */
-//save_context:
-	swi	r11, r1, PT_MODE	/* store the mode */
-	lwi	r11, r0, PER_CPU(R11_SAVE)	/* reload r11 */
-	/* save them on stack */
-	swi	r2, r1, PT_R2
-	swi	r3, r1, PT_R3 /* r3: _always_ in clobber list; see unistd.h */
-	swi	r4, r1, PT_R4 /* r4: _always_ in clobber list; see unistd.h */
-	swi	r5, r1, PT_R5
-	swi	r6, r1, PT_R6
-	swi	r7, r1, PT_R7
-	swi	r8, r1, PT_R8
-	swi	r9, r1, PT_R9
-	swi	r10, r1, PT_R10
-	swi	r11, r1, PT_R11
-	/* r12: _always_ in clobber list; see unistd.h */
-	swi	r12, r1, PT_R12
-	swi	r13, r1, PT_R13
-	/* r14: _always_ in clobber list; see unistd.h */
-	swi	r14, r1, PT_R14
-	swi	r14, r1, PT_PC /* Will return to interrupted instruction */
-	swi	r15, r1, PT_R15
-	swi	r16, r1, PT_R16
-	swi	r17, r1, PT_R17
-	swi	r18, r1, PT_R18
-	swi	r19, r1, PT_R19
-	swi	r20, r1, PT_R20
-	swi	r21, r1, PT_R21
-	swi	r22, r1, PT_R22
-	swi	r23, r1, PT_R23
-	swi	r24, r1, PT_R24
-	swi	r25, r1, PT_R25
-	swi	r26, r1, PT_R26
-	swi	r27, r1, PT_R27
-	swi	r28, r1, PT_R28
-	swi	r29, r1, PT_R29
-	swi	r30, r1, PT_R30
-	swi	r31, r1, PT_R31
-
-	disable_irq
-	nop		/* make sure IE bit is in effect */
-	clear_bip	/* once IE is in effect it is safe to clear BIP */
-	nop
-
-	/* special purpose registers */
-	mfs	r11, rmsr
-	swi	r11, r1, PT_MSR
-	mfs	r11, rear
-	swi	r11, r1, PT_EAR
-	mfs	r11, resr
-	swi	r11, r1, PT_ESR
-	mfs	r11, rfsr
-	swi	r11, r1, PT_FSR
-	/* reload original stack pointer and save it */
-	lwi	r11, r0, PER_CPU(ENTRY_SP)
-	swi	r11, r1, PT_R1
-	/* update mode indicator we are in kernel mode */
-	addik	r11, r0, 1
-	swi	r11, r0, PER_CPU(KM)
-	/* restore r31 */
-	lwi	r31, r0, PER_CPU(CURRENT_SAVE)
-	/* re-enable interrupts now we are in kernel mode */
-	enable_irq
-
-	addi	r5, r0, SIGTRAP			/* sending the trap signal */
-	add	r6, r0, r31			/* to current */
-	bralid	r15, send_sig
-	add	r7, r0, r0			/* 3rd param zero */
-
-	addik	r30, r0, 1			/* restarts allowed ??? */
-	/* Restore r3/r4 to work around how ret_to_user works */
-	lwi	r3, r1, PT_R3
-	lwi	r4, r1, PT_R4
-	bri	ret_to_user
-
-ENTRY(_break)
-	bri	0
-
-/* struct task_struct *_switch_to(struct thread_info *prev,
-					struct thread_info *next); */
-ENTRY(_switch_to)
-	/* prepare return value */
-	addk	r3, r0, r31
-
-	/* save registers in cpu_context */
-	/* use r11 and r12, volatile registers, as temp register */
-	addik	r11, r5, TI_CPU_CONTEXT
-	swi	r1, r11, CC_R1
-	swi	r2, r11, CC_R2
-	/* skip volatile registers.
-	 * they are saved on stack when we jumped to _switch_to() */
-	/* dedicated registers */
-	swi	r13, r11, CC_R13
-	swi	r14, r11, CC_R14
-	swi	r15, r11, CC_R15
-	swi	r16, r11, CC_R16
-	swi	r17, r11, CC_R17
-	swi	r18, r11, CC_R18
-	/* save non-volatile registers */
-	swi	r19, r11, CC_R19
-	swi	r20, r11, CC_R20
-	swi	r21, r11, CC_R21
-	swi	r22, r11, CC_R22
-	swi	r23, r11, CC_R23
-	swi	r24, r11, CC_R24
-	swi	r25, r11, CC_R25
-	swi	r26, r11, CC_R26
-	swi	r27, r11, CC_R27
-	swi	r28, r11, CC_R28
-	swi	r29, r11, CC_R29
-	swi	r30, r11, CC_R30
-	/* special purpose registers */
-	mfs	r12, rmsr
-	swi	r12, r11, CC_MSR
-	mfs	r12, rear
-	swi	r12, r11, CC_EAR
-	mfs	r12, resr
-	swi	r12, r11, CC_ESR
-	mfs	r12, rfsr
-	swi	r12, r11, CC_FSR
-
-	/* update r31, the current */
-	lwi	r31, r6, TI_TASK
-	swi	r31, r0, PER_CPU(CURRENT_SAVE)
-
-	/* get new process' cpu context and restore */
-	addik	r11, r6, TI_CPU_CONTEXT
-
-	/* special purpose registers */
-	lwi	r12, r11, CC_FSR
-	mts	rfsr, r12
-	lwi	r12, r11, CC_ESR
-	mts	resr, r12
-	lwi	r12, r11, CC_EAR
-	mts	rear, r12
-	lwi	r12, r11, CC_MSR
-	mts	rmsr, r12
-	/* non-volatile registers */
-	lwi	r30, r11, CC_R30
-	lwi	r29, r11, CC_R29
-	lwi	r28, r11, CC_R28
-	lwi	r27, r11, CC_R27
-	lwi	r26, r11, CC_R26
-	lwi	r25, r11, CC_R25
-	lwi	r24, r11, CC_R24
-	lwi	r23, r11, CC_R23
-	lwi	r22, r11, CC_R22
-	lwi	r21, r11, CC_R21
-	lwi	r20, r11, CC_R20
-	lwi	r19, r11, CC_R19
-	/* dedicated registers */
-	lwi	r18, r11, CC_R18
-	lwi	r17, r11, CC_R17
-	lwi	r16, r11, CC_R16
-	lwi	r15, r11, CC_R15
-	lwi	r14, r11, CC_R14
-	lwi	r13, r11, CC_R13
-	/* skip volatile registers */
-	lwi	r2, r11, CC_R2
-	lwi	r1, r11, CC_R1
-
-	rtsd	r15, 8
-	nop
-
-ENTRY(ret_from_fork)
-	addk	r5, r0, r3
-	brlid	r15, schedule_tail
-	nop
-	swi	r31, r1, PT_R31		/* save r31 in user context. */
-			/* will soon be restored to r31 in ret_to_user */
-	addk	r3, r0, r0
-	brid	ret_to_user
-	nop
-
-ENTRY(ret_from_kernel_thread)
-	brlid	r15, schedule_tail
-	addk	r5, r0, r3
-	brald	r15, r20
-	addk	r5, r0, r19
-	brid	ret_to_user
-	addk	r3, r0, r0
-
-work_pending:
-	lwi	r11, r1, PT_MODE
-	bneid	r11, 2f
-3:
-	enable_irq
-	andi	r11, r19, _TIF_NEED_RESCHED
-	beqi	r11, 1f
-	bralid	r15, schedule
-	nop
-	bri	4f
-1:	andi	r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME
-	beqi	r11, no_work_pending
-	addk	r5, r30, r0
-	bralid	r15, do_notify_resume
-	addik	r6, r0, 1
-	addk	r30, r0, r0	/* no restarts from now on */
-4:
-	disable_irq
-	lwi	r6, r31, TS_THREAD_INFO /* get thread info */
-	lwi	r19, r6, TI_FLAGS /* get flags in thread info */
-	bri	3b
-
-ENTRY(ret_to_user)
-	disable_irq
-
-	swi	r4, r1, PT_R4		/* return val */
-	swi	r3, r1, PT_R3		/* return val */
-
-	lwi	r6, r31, TS_THREAD_INFO /* get thread info */
-	lwi	r19, r6, TI_FLAGS /* get flags in thread info */
-	bnei	r19, work_pending /* do an extra work if any bits are set */
-no_work_pending:
-	disable_irq
-
-2:
-	/* save r31 */
-	swi	r31, r0, PER_CPU(CURRENT_SAVE)
-	/* save mode indicator */
-	lwi	r18, r1, PT_MODE
-	swi	r18, r0, PER_CPU(KM)
-//restore_context:
-	/* special purpose registers */
-	lwi	r18, r1, PT_FSR
-	mts	rfsr, r18
-	lwi	r18, r1, PT_ESR
-	mts	resr, r18
-	lwi	r18, r1, PT_EAR
-	mts	rear, r18
-	lwi	r18, r1, PT_MSR
-	mts	rmsr, r18
-
-	lwi	r31, r1, PT_R31
-	lwi	r30, r1, PT_R30
-	lwi	r29, r1, PT_R29
-	lwi	r28, r1, PT_R28
-	lwi	r27, r1, PT_R27
-	lwi	r26, r1, PT_R26
-	lwi	r25, r1, PT_R25
-	lwi	r24, r1, PT_R24
-	lwi	r23, r1, PT_R23
-	lwi	r22, r1, PT_R22
-	lwi	r21, r1, PT_R21
-	lwi	r20, r1, PT_R20
-	lwi	r19, r1, PT_R19
-	lwi	r18, r1, PT_R18
-	lwi	r17, r1, PT_R17
-	lwi	r16, r1, PT_R16
-	lwi	r15, r1, PT_R15
-	lwi	r14, r1, PT_PC
-	lwi	r13, r1, PT_R13
-	lwi	r12, r1, PT_R12
-	lwi	r11, r1, PT_R11
-	lwi	r10, r1, PT_R10
-	lwi	r9, r1, PT_R9
-	lwi	r8, r1, PT_R8
-	lwi	r7, r1, PT_R7
-	lwi	r6, r1, PT_R6
-	lwi	r5, r1, PT_R5
-	lwi	r4, r1, PT_R4		/* return val */
-	lwi	r3, r1, PT_R3		/* return val */
-	lwi	r2, r1, PT_R2
-	lwi	r1, r1, PT_R1
-
-	rtid	r14, 0
-	nop
-
-sys_rt_sigreturn_wrapper:
-	addk	r30, r0, r0		/* no restarts for this one */
-	brid	sys_rt_sigreturn
-	addk	r5, r1, r0
-
-	/* Interrupt vector table */
-	.section	.init.ivt, "ax"
-	.org 0x0
-	brai	_reset
-	brai	_user_exception
-	brai	_interrupt
-	brai	_break
-	brai	_hw_exception_handler
-	.org 0x60
-	brai	_debug_exception
-
-.section .rodata,"a"
-#include "syscall_table.S"
-
-syscall_table_size=(.-sys_call_table)
-
-type_SYSCALL:
-	.ascii "SYSCALL\0"
-type_IRQ:
-	.ascii "IRQ\0"
-type_IRQ_PREEMPT:
-	.ascii "IRQ (PREEMPTED)\0"
-type_SYSCALL_PREEMPT:
-	.ascii " SYSCALL (PREEMPTED)\0"
-
-	/*
-	 * Trap decoding for stack unwinder
-	 * Tuples are (start addr, end addr, string)
-	 * If return address lies on [start addr, end addr],
-	 * unwinder displays 'string'
-	 */
-
-	.align 4
-.global microblaze_trap_handlers
-microblaze_trap_handlers:
-	/* Exact matches come first */
-	.word ret_to_user  ; .word ret_to_user    ; .word type_SYSCALL
-	.word ret_from_intr; .word ret_from_intr  ; .word type_IRQ
-	/* Fuzzy matches go here */
-	.word ret_from_intr; .word no_intr_resched; .word type_IRQ_PREEMPT
-	.word work_pending ; .word no_work_pending; .word type_SYSCALL_PREEMPT
-	/* End of table */
-	.word 0             ; .word 0               ; .word 0

arch/microblaze/kernel/exceptions.c

···
 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
 							int fsr, int addr)
 {
-#ifdef CONFIG_MMU
 	addr = regs->pc;
-#endif
 
 #if 0
 	pr_warn("Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n",
···
 			fsr = FPE_FLTRES;
 		_exception(SIGFPE, regs, fsr, addr);
 		break;
-
-#ifdef CONFIG_MMU
 	case MICROBLAZE_PRIVILEGED_EXCEPTION:
 		pr_debug("Privileged exception\n");
 		_exception(SIGILL, regs, ILL_PRVOPC, addr);
 		break;
-#endif
 	default:
 	/* FIXME what to do in unexpected exception */
 		pr_warn("Unexpected exception %02x PC=%08x in %s mode\n",

arch/microblaze/kernel/head.S

···
 #include <asm/page.h>
 #include <linux/of_fdt.h>		/* for OF_DT_HEADER */
 
-#ifdef CONFIG_MMU
 #include <asm/setup.h> /* COMMAND_LINE_SIZE */
 #include <asm/mmu.h>
 #include <asm/processor.h>
···
 .global swapper_pg_dir
 swapper_pg_dir:
 	.space	PAGE_SIZE
-
-#endif /* CONFIG_MMU */
 
 .section .rodata
 .align 4
···
 	bgtid	r3, _copy_fdt /* loop for all entries */
 	addik	r3, r3, -4 /* descrement loop */
 no_fdt_arg:
-
-#ifdef CONFIG_MMU
 
 #ifndef CONFIG_CMDLINE_BOOL
 /*
···
 	nop
 
 start_here:
-#endif /* CONFIG_MMU */
 
 	/* Initialize small data anchors */
 	addik	r13, r0, _KERNEL_SDA_BASE_
···
 	brald	r15, r11
 	nop
 
-#ifndef CONFIG_MMU
-	addik	r15, r0, machine_halt
-	braid	start_kernel
-	nop
-#else
 	/*
 	 * Initialize the MMU.
 	 */
···
 	nop
 	rted	r17, 0		/* enable MMU and jump to start_kernel */
 	nop
-#endif /* CONFIG_MMU */

arch/microblaze/kernel/hw_exception_handler.S

···
 /* Helpful Macros */
 #define NUM_TO_REG(num)		r ## num
 
-#ifdef CONFIG_MMU
 	#define RESTORE_STATE			\
 		lwi	r5, r1, 0;		\
 		mts	rmsr, r5;		\
···
 		lwi	r11, r1, PT_R11;	\
 		lwi	r31, r1, PT_R31;	\
 		lwi	r1, r1, PT_R1;
-#endif /* CONFIG_MMU */
 
 #define LWREG_NOP			\
 	bri	ex_handler_unhandled;	\
···
 #define SWREG_NOP			\
 	bri	ex_handler_unhandled;	\
 	nop;
-
-/* FIXME this is weird - for noMMU kernel is not possible to use brid
- * instruction which can shorten executed time
- */
 
 /* r3 is the source */
 #define R3_TO_LWREG_V(regnum)				\
···
 	or	r3, r0, NUM_TO_REG (regnum);		\
 	bri	ex_sw_tail;
 
-#ifdef CONFIG_MMU
 	#define R3_TO_LWREG_VM_V(regnum)		\
 		brid	ex_lw_end_vm;			\
 		swi	r3, r7, 4 * regnum;
···
 	.endm
 	#endif
 
-#endif /* CONFIG_MMU */
 
 .extern other_exception_handler /* Defined in exception.c */
 
···
  */
 
 /* wrappers to restore state before coming to entry.S */
-#ifdef CONFIG_MMU
 .section .data
 .align 4
 pt_pool_space:
···
 	.long	TOPHYS(ex_handler_unhandled)
 	.long	TOPHYS(ex_handler_unhandled)
 	.long	TOPHYS(ex_handler_unhandled)
-#endif
 
 .global _hw_exception_handler
 .section .text
 .align 4
 .ent _hw_exception_handler
 _hw_exception_handler:
-#ifndef CONFIG_MMU
-	addik	r1, r1, -(EX_HANDLER_STACK_SIZ); /* Create stack frame */
-#else
 	swi	r1, r0, TOPHYS(pt_pool_space + PT_R1); /* GET_SP */
 	/* Save date to kernel memory. Here is the problem
 	 * when you came from user space */
 	ori	r1, r0, TOPHYS(pt_pool_space);
-#endif
 	swi	r3, r1, PT_R3
 	swi	r4, r1, PT_R4
 	swi	r5, r1, PT_R5
 	swi	r6, r1, PT_R6
 
-#ifdef CONFIG_MMU
 	swi	r11, r1, PT_R11
 	swi	r31, r1, PT_R31
 	lwi	r31, r0, TOPHYS(PER_CPU(CURRENT_SAVE)) /* get saved current */
-#endif
 
 	mfs	r5, rmsr;
 	nop
···
 	mfs	r3, rear;
 	nop
 
-#ifndef CONFIG_MMU
-	andi	r5, r4, 0x1000;		/* Check ESR[DS] */
-	beqi	r5, not_in_delay_slot;	/* Branch if ESR[DS] not set */
-	mfs	r17, rbtr;	/* ESR[DS] set - return address in BTR */
-	nop
-not_in_delay_slot:
-	swi	r17, r1, PT_R17
-#endif
-
 	andi	r5, r4, 0x1F;		/* Extract ESR[EXC] */
 
-#ifdef CONFIG_MMU
 	/* Calculate exception vector offset = r5 << 2 */
 	addk	r6, r5, r5; /* << 1 */
 	addk	r6, r6, r6; /* << 2 */
···
 full_exception_trapw:
 	RESTORE_STATE
 	bri	full_exception_trap
-#else
-	/* Exceptions enabled here. This will allow nested exceptions */
-	mfs	r6, rmsr;
-	nop
-	swi	r6, r1, 0; /* RMSR_OFFSET */
-	ori	r6, r6, 0x100; /* Turn ON the EE bit */
-	andi	r6, r6, ~2; /* Disable interrupts */
-	mts	rmsr, r6;
-	nop
-
-	xori	r6, r5, 1; /* 00001 = Unaligned Exception */
-	/* Jump to unalignment exception handler */
-	beqi	r6, handle_unaligned_ex;
-
-handle_other_ex: /* Handle Other exceptions here */
-	/* Save other volatiles before we make procedure calls below */
-	swi	r7, r1, PT_R7
-	swi	r8, r1, PT_R8
-	swi	r9, r1, PT_R9
-	swi	r10, r1, PT_R10
-	swi	r11, r1, PT_R11
-	swi	r12, r1, PT_R12
-	swi	r14, r1, PT_R14
-	swi	r15, r1, PT_R15
-	swi	r18, r1, PT_R18
-
-	or	r5, r1, r0
-	andi	r6, r4, 0x1F; /* Load ESR[EC] */
-	lwi	r7, r0, PER_CPU(KM) /* MS: saving current kernel mode to regs */
-	swi	r7, r1, PT_MODE
-	mfs	r7, rfsr
-	nop
-	addk	r8, r17, r0; /* Load exception address */
-	bralid	r15, full_exception; /* Branch to the handler */
-	nop;
-	mts	rfsr, r0;	/* Clear sticky fsr */
-	nop
-
-	/*
-	 * Trigger execution of the signal handler by enabling
-	 * interrupts and calling an invalid syscall.
-	 */
-	mfs	r5, rmsr;
-	nop
-	ori	r5, r5, 2;
-	mts	rmsr, r5; /* enable interrupt */
-	nop
-	addi	r12, r0, __NR_syscalls;
-	brki	r14, 0x08;
-	mfs	r5, rmsr; /* disable interrupt */
-	nop
-	andi	r5, r5, ~2;
-	mts	rmsr, r5;
-	nop
-
-	lwi	r7, r1, PT_R7
-	lwi	r8, r1, PT_R8
-	lwi	r9, r1, PT_R9
-	lwi	r10, r1, PT_R10
-	lwi	r11, r1, PT_R11
-	lwi	r12, r1, PT_R12
-	lwi	r14, r1, PT_R14
-	lwi	r15, r1, PT_R15
-	lwi	r18, r1, PT_R18
-
-	bri	ex_handler_done; /* Complete exception handling */
-#endif
 
 /* 0x01 - Unaligned data access exception
  * This occurs when a word access is not aligned on a word boundary,
···
 	 *  R4 = ESR
 	 *  R3 = EAR
 	 */
-#ifdef CONFIG_MMU
 	andi	r6, r4, 0x1000			/* Check ESR[DS] */
 	beqi	r6, _no_delayslot		/* Branch if ESR[DS] not set */
 	mfs	r17, rbtr;	/* ESR[DS] set - return address in BTR */
···
 	/* jump to high level unaligned handler */
 	RESTORE_STATE;
 	bri	unaligned_data_trap
-#endif
+
 	andi	r6, r4, 0x3E0; /* Mask and extract the register operand */
 	srl	r6, r6; /* r6 >> 5 */
 	srl	r6, r6;
···
 ex_sw_end: /* Exception handling of store word, ends. */
 
 ex_handler_done:
-#ifndef CONFIG_MMU
-	lwi	r5, r1, 0 /* RMSR */
-	mts	rmsr, r5
-	nop
-	lwi	r3, r1, PT_R3
-	lwi	r4, r1, PT_R4
-	lwi	r5, r1, PT_R5
-	lwi	r6, r1, PT_R6
-	lwi	r17, r1, PT_R17
-
-	rted	r17, 0
-	addik	r1, r1, (EX_HANDLER_STACK_SIZ); /* Restore stack frame */
-#else
 	RESTORE_STATE;
 	rted	r17, 0
 	nop
-#endif
 
-#ifdef CONFIG_MMU
 	/* Exception vector entry code. This code runs with address translation
 	 * turned off (i.e. using physical addresses). */
 
···
 		 * bits 20 and 21 are zero.
 		 */
 		andi	r3, r3, PAGE_MASK
-#ifdef CONFIG_MICROBLAZE_64K_PAGES
-		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_64K)
-#elif CONFIG_MICROBLAZE_16K_PAGES
-		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_16K)
-#else
 		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_4K)
-#endif
 		mts	rtlbhi,	r3		/* Load TLB HI */
 		nop
 
···
 		rtsd	r15,8
 		nop
 
-#endif
 .end _hw_exception_handler
 
-#ifdef CONFIG_MMU
 /* Unaligned data access exception last on a 4k page for MMU.
  * When this is called, we are in virtual mode with exceptions enabled
  * and registers 1-13,15,17,18 saved.
···
 	.word	store6,ex_unaligned_fixup;
 .previous;
 .end _unaligned_data_exception
-#endif /* CONFIG_MMU */
 
 .global ex_handler_unhandled
 ex_handler_unhandled:
···
 lw_r28:		R3_TO_LWREG	(28);
 lw_r29:		R3_TO_LWREG	(29);
 lw_r30:		R3_TO_LWREG	(30);
-#ifdef CONFIG_MMU
 lw_r31: 	R3_TO_LWREG_V	(31);
-#else
-lw_r31:		R3_TO_LWREG	(31);
-#endif
 
 sw_table:
 sw_r0:		SWREG_TO_R3	(0);
···
 sw_r28:		SWREG_TO_R3	(28);
 sw_r29:		SWREG_TO_R3	(29);
 sw_r30:		SWREG_TO_R3	(30);
-#ifdef CONFIG_MMU
 sw_r31:		SWREG_TO_R3_V	(31);
-#else
-sw_r31:		SWREG_TO_R3	(31);
-#endif
 
-#ifdef CONFIG_MMU
 lw_table_vm:
 lw_r0_vm:	R3_TO_LWREG_VM		(0);
 lw_r1_vm:	R3_TO_LWREG_VM_V	(1);
···
 sw_r29_vm:	SWREG_TO_R3_VM_V	(29);
 sw_r30_vm:	SWREG_TO_R3_VM_V	(30);
 sw_r31_vm:	SWREG_TO_R3_VM_V	(31);
-#endif /* CONFIG_MMU */
 
 /* Temporary data structures used in the handler */
 .section .data

arch/microblaze/kernel/microblaze_ksyms.c

···
 EXPORT_SYMBOL(memmove);
 #endif
 
-#ifdef CONFIG_MMU
 EXPORT_SYMBOL(empty_zero_page);
-#endif
 
 EXPORT_SYMBOL(mbc);
 

arch/microblaze/kernel/process.c

···
 		ti->cpu_context.r19 = (unsigned long)arg;
 		childregs->pt_mode = 1;
 		local_save_flags(childregs->msr);
-#ifdef CONFIG_MMU
 		ti->cpu_context.msr = childregs->msr & ~MSR_IE;
-#endif
 		ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
 		return 0;
 	}
···
 
 	memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
 	ti->cpu_context.r1 = (unsigned long)childregs;
-#ifndef CONFIG_MMU
-	ti->cpu_context.msr = (unsigned long)childregs->msr;
-#else
 	childregs->msr |= MSR_UMS;
 
 	/* we should consider the fact that childregs is a copy of the parent
···
 	ti->cpu_context.msr = (childregs->msr|MSR_VM);
 	ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */
 	ti->cpu_context.msr &= ~MSR_IE;
-#endif
 	ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
 
 	/*
···
 	regs->pc = pc;
 	regs->r1 = usp;
 	regs->pt_mode = 0;
-#ifdef CONFIG_MMU
 	regs->msr |= MSR_UMS;
 	regs->msr &= ~MSR_VM;
-#endif
 }
 
-#ifdef CONFIG_MMU
 #include <linux/elfcore.h>
 /*
  * Set up a thread for executing a new program
···
 {
 	return 0; /* MicroBlaze has no separate FPU registers */
 }
-#endif /* CONFIG_MMU */
 
 void arch_cpu_idle(void)
 {

arch/microblaze/kernel/setup.c

···
  */
 
 #include <linux/init.h>
-#include <linux/clk-provider.h>
+#include <linux/of_clk.h>
 #include <linux/clocksource.h>
 #include <linux/string.h>
 #include <linux/seq_file.h>
···
 }
 arch_initcall(microblaze_debugfs_init);
 
-# ifdef CONFIG_MMU
 static int __init debugfs_tlb(void)
 {
 	debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 	return 0;
 }
 device_initcall(debugfs_tlb);
-# endif
 #endif

arch/microblaze/kernel/signal.c

···
 	struct rt_sigframe __user *frame;
 	int err = 0, sig = ksig->sig;
 	unsigned long address = 0;
-#ifdef CONFIG_MMU
 	pmd_t *pmdp;
 	pte_t *ptep;
-#endif
 
 	frame = get_sigframe(ksig, regs, sizeof(*frame));
 
···
 	regs->r15 = ((unsigned long)frame->tramp)-8;
 
 	address = ((unsigned long)frame->tramp);
-#ifdef CONFIG_MMU
 	pmdp = pmd_off(current->mm, address);
 
 	preempt_disable();
···
 	}
 	pte_unmap(ptep);
 	preempt_enable();
-#else
-	flush_icache_range(address, address + 8);
-	flush_dcache_range(address, address + 8);
-#endif
 	if (err)
 		return -EFAULT;
 
···
 
 asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
 {
-	if (test_thread_flag(TIF_SIGPENDING))
+	if (test_thread_flag(TIF_SIGPENDING) ||
+	    test_thread_flag(TIF_NOTIFY_SIGNAL))
 		do_signal(regs, in_syscall);
 
 	if (test_thread_flag(TIF_NOTIFY_RESUME))

arch/microblaze/kernel/unwind.c

···
  * unwind_trap - Unwind through a system trap, that stored previous state
  *		 on the stack.
  */
-#ifdef CONFIG_MMU
 static inline void unwind_trap(struct task_struct *task, unsigned long pc,
 				unsigned long fp, struct stack_trace *trace,
 				const char *loglvl)
 {
 	/* To be implemented */
 }
-#else
-static inline void unwind_trap(struct task_struct *task, unsigned long pc,
-				unsigned long fp, struct stack_trace *trace,
-				const char *loglvl)
-{
-	const struct pt_regs *regs = (const struct pt_regs *) fp;
-	microblaze_unwind_inner(task, regs->pc, regs->r1, regs->r15, trace, loglvl);
-}
-#endif
 
 /**
  * microblaze_unwind_inner - Unwind the stack from the specified point
···
 			 * HW exception handler doesn't save all registers,
 			 * so we open-code a special case of unwind_trap()
 			 */
-#ifndef CONFIG_MMU
-			const struct pt_regs *regs =
-				(const struct pt_regs *) fp;
-#endif
 			printk("%sHW EXCEPTION\n", loglvl);
-#ifndef CONFIG_MMU
-			microblaze_unwind_inner(task, regs->r17 - 4,
-						fp + EX_HANDLER_STACK_SIZ,
-						regs->r15, trace, loglvl);
-#endif
 			return;
 		}
 

arch/microblaze/mm/Makefile

···
 # Makefile
 #
 
-obj-y := consistent.o init.o
-
-obj-$(CONFIG_MMU) += pgtable.o mmu_context.o fault.o
+obj-y := consistent.o init.o pgtable.o mmu_context.o fault.o

arch/microblaze/mm/consistent.c

···
 
 	flush_dcache_range(paddr, paddr + size);
 }
-
-#ifndef CONFIG_MMU
-/*
- * Consistent memory allocators. Used for DMA devices that want to share
- * uncached memory with the processor core.  My crufty no-MMU approach is
- * simple.  In the HW platform we can optionally mirror the DDR up above the
- * processor cacheable region.  So, memory accessed in this mirror region will
- * not be cached.  It's alloced from the same pool as normal memory, but the
- * handle we return is shifted up into the uncached region.  This will no doubt
- * cause big problems if memory allocated here is not also freed properly. -- JW
- *
- * I have to use dcache values because I can't relate on ram size:
- */
-#ifdef CONFIG_XILINX_UNCACHED_SHADOW
-#define UNCACHED_SHADOW_MASK (cpuinfo.dcache_high - cpuinfo.dcache_base + 1)
-#else
-#define UNCACHED_SHADOW_MASK 0
-#endif /* CONFIG_XILINX_UNCACHED_SHADOW */
-
-void *arch_dma_set_uncached(void *ptr, size_t size)
-{
-	unsigned long addr = (unsigned long)ptr;
-
-	addr |= UNCACHED_SHADOW_MASK;
-	if (addr > cpuinfo.dcache_base && addr < cpuinfo.dcache_high)
-		pr_warn("ERROR: Your cache coherent area is CACHED!!!\n");
-	return (void *)addr;
-}
-#endif /* CONFIG_MMU */

arch/microblaze/mm/init.c

···
 /* Use for MMU and noMMU because of PCI generic code */
 int mem_init_done;
 
-#ifndef CONFIG_MMU
-unsigned int __page_offset;
-EXPORT_SYMBOL(__page_offset);
-#endif /* CONFIG_MMU */
-
 char *klimit = _end;
 
 /*
···
 static void __init paging_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES];
-#ifdef CONFIG_MMU
 	int idx;
 
 	/* Setup fixmaps */
 	for (idx = 0; idx < __end_of_fixed_addresses; idx++)
 		clear_fixmap(idx);
-#endif
 
 	/* Clean every zones */
 	memset(zones_size, 0, sizeof(zones_size));
···
 
 void __init setup_memory(void)
 {
-#ifndef CONFIG_MMU
-	u32 kernel_align_start, kernel_align_size;
-	phys_addr_t start, end;
-	u64 i;
-
-	/* Find main memory where is the kernel */
-	for_each_mem_range(i, &start, &end) {
-		memory_start = start;
-		lowmem_size = end - start;
-		if ((memory_start <= (u32)_text) &&
-			((u32)_text <= (memory_start + lowmem_size - 1))) {
-			memory_size = lowmem_size;
-			PAGE_OFFSET = memory_start;
-			pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
-				__func__, (u32) memory_start,
-					(u32) memory_size);
-			break;
-		}
-	}
-
-	if (!memory_start || !memory_size) {
-		panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
-			__func__, (u32) memory_start, (u32) memory_size);
-	}
-
-	/* reservation of region where is the kernel */
-	kernel_align_start = PAGE_DOWN((u32)_text);
-	/* ALIGN can be remove because _end in vmlinux.lds.S is align */
-	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
-	pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
-		__func__, kernel_align_start, kernel_align_start
-			+ kernel_align_size, kernel_align_size);
-	memblock_reserve(kernel_align_start, kernel_align_size);
-#endif
 	/*
 	 * Kernel:
 	 * start: base phys address of kernel - page align
···
 	mem_init_done = 1;
 }
 
-#ifndef CONFIG_MMU
-int page_is_ram(unsigned long pfn)
-{
-	return __range_ok(pfn, 0);
-}
-#else
 int page_is_ram(unsigned long pfn)
 {
 	return pfn < max_low_pfn;
···
 				MEMBLOCK_LOW_LIMIT, memory_start + kernel_tlb,
 				NUMA_NO_NODE);
 }
-
-#endif /* CONFIG_MMU */
 
 void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
 {

arch/microblaze/pci/pci-common.c

···
 		 * memory, effectively behaving just like /dev/zero
 		 */
 		if ((offset + size) > hose->isa_mem_size) {
-#ifdef CONFIG_MMU
 			pr_debug("Process %s (pid:%d) mapped non-existing PCI",
 				current->comm, current->pid);
 			pr_debug("legacy memory for 0%04x:%02x\n",
 				pci_domain_nr(bus), bus->number);
-#endif
 			if (vma->vm_flags & VM_SHARED)
 				return shmem_zero_setup(vma);
 			return 0;