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| author | Michal Simek <michal.simek@xilinx.com> | 2020-11-26 16:32:25 +0300 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2020-11-26 18:39:35 +0300 |
| commit | 05cdf457477d6603b207d91873f0a3d4c7f8c1cd (patch) | |
| tree | 187900c636e5c8b9da2fe4344cbc8658ab92541a /arch | |
| parent | ed2124c0b9a8d2c09e3b5b9ca9827187c5fcbe71 (diff) | |
| download | linux-05cdf457477d6603b207d91873f0a3d4c7f8c1cd.tar.xz | |
microblaze: Remove noMMU code
This configuration is obsolete and likely none is really using it. That's
why remove it to simplify code.
Note about CONFIG_MMU in hw_exception_handler.S is left intentionally
for better comment understanding.
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/43486cab370e0c0a79860120b71e0caac75a7e44.1606397528.git.michal.simek@xilinx.com
Diffstat (limited to 'arch')
32 files changed, 11 insertions, 1251 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 33925ffed68f..32739ab2af25 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -3,19 +3,17 @@ config MICROBLAZE 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_CLOCKEVENTS select GENERIC_CPU_DEVICES @@ -45,7 +43,7 @@ config MICROBLAZE 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 @@ -96,8 +94,7 @@ menu "Processor type and features" source "kernel/Kconfig.hz" config MMU - bool "MMU support" - default n + def_bool y comment "Boot options" @@ -143,18 +140,8 @@ config ADVANCED_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 help The address space of Microblaze processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address @@ -167,7 +154,7 @@ config HIGHMEM 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 @@ -205,12 +192,11 @@ config KERNEL_START_BOOL 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 @@ -222,33 +208,6 @@ 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 menu "Bus Options" diff --git a/arch/microblaze/Makefile b/arch/microblaze/Makefile index 7b340a35b194..bb980891816d 100644 --- a/arch/microblaze/Makefile +++ b/arch/microblaze/Makefile @@ -1,11 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 KBUILD_DEFCONFIG := mmu_defconfig -ifeq ($(CONFIG_MMU),y) UTS_SYSNAME = -DUTS_SYSNAME=\"Linux\" -else -UTS_SYSNAME = -DUTS_SYSNAME=\"uClinux\" -endif # What CPU vesion are we building for, and crack it open # as major.minor.rev @@ -67,12 +63,7 @@ DTB:=$(subst simpleImage.,,$(filter simpleImage.%, $(MAKECMDGOALS))) 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 diff --git a/arch/microblaze/configs/mmu_defconfig b/arch/microblaze/configs/mmu_defconfig index 9b8a50f30662..51337fffb947 100644 --- a/arch/microblaze/configs/mmu_defconfig +++ b/arch/microblaze/configs/mmu_defconfig @@ -16,7 +16,6 @@ CONFIG_XILINX_MICROBLAZE0_USE_DIV=1 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 diff --git a/arch/microblaze/configs/nommu_defconfig b/arch/microblaze/configs/nommu_defconfig deleted file mode 100644 index 8c420782d6e4..000000000000 --- a/arch/microblaze/configs/nommu_defconfig +++ /dev/null @@ -1,90 +0,0 @@ -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 diff --git a/arch/microblaze/include/asm/dma.h b/arch/microblaze/include/asm/dma.h index e6cb6d0725af..f801582be912 100644 --- a/arch/microblaze/include/asm/dma.h +++ b/arch/microblaze/include/asm/dma.h @@ -6,14 +6,8 @@ #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; diff --git a/arch/microblaze/include/asm/exceptions.h b/arch/microblaze/include/asm/exceptions.h index d67e65b72215..967f175173e1 100644 --- a/arch/microblaze/include/asm/exceptions.h +++ b/arch/microblaze/include/asm/exceptions.h @@ -11,11 +11,6 @@ #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 */ diff --git a/arch/microblaze/include/asm/io.h b/arch/microblaze/include/asm/io.h index 1dd6fae41897..b6a57f8468f0 100644 --- a/arch/microblaze/include/asm/io.h +++ b/arch/microblaze/include/asm/io.h @@ -30,15 +30,12 @@ extern resource_size_t isa_mem_base; #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)) #define out_be16(a, v) __raw_writew((v), (a)) diff --git a/arch/microblaze/include/asm/mmu.h b/arch/microblaze/include/asm/mmu.h index 97f1243101cc..b928a87c0076 100644 --- a/arch/microblaze/include/asm/mmu.h +++ b/arch/microblaze/include/asm/mmu.h @@ -8,9 +8,6 @@ #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__ @@ -119,5 +116,4 @@ extern u32 tlb_skip; # define TLB_G 0x00000001 /* Memory is guarded from prefetch */ # endif /* __KERNEL__ */ -# endif /* CONFIG_MMU */ #endif /* _ASM_MICROBLAZE_MMU_H */ diff --git a/arch/microblaze/include/asm/mmu_context.h b/arch/microblaze/include/asm/mmu_context.h index f74f9da07fdc..866e52da5eb9 100644 --- a/arch/microblaze/include/asm/mmu_context.h +++ b/arch/microblaze/include/asm/mmu_context.h @@ -1,6 +1,2 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#ifdef CONFIG_MMU # include <asm/mmu_context_mm.h> -#else -# include <asm-generic/mmu_context.h> -#endif diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h index b13463d39b38..bf681f272f72 100644 --- a/arch/microblaze/include/asm/page.h +++ b/arch/microblaze/include/asm/page.h @@ -20,13 +20,7 @@ #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)) @@ -44,17 +38,6 @@ #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). @@ -70,8 +53,6 @@ extern unsigned int __page_offset; 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) @@ -86,25 +67,12 @@ typedef struct page *pgtable_t; 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) }) @@ -142,28 +110,12 @@ extern int page_is_ram(unsigned long pfn); # 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__ */ @@ -174,12 +126,6 @@ extern int page_is_ram(unsigned long pfn); /* 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) \ @@ -188,14 +134,9 @@ extern int page_is_ram(unsigned long pfn); 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__ */ #include <asm-generic/memory_model.h> diff --git a/arch/microblaze/include/asm/pgalloc.h b/arch/microblaze/include/asm/pgalloc.h index 8839ce00ea05..d56b9f670ad1 100644 --- a/arch/microblaze/include/asm/pgalloc.h +++ b/arch/microblaze/include/asm/pgalloc.h @@ -8,8 +8,6 @@ #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> @@ -42,6 +40,4 @@ extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); #define pmd_populate_kernel(mm, pmd, pte) \ (pmd_val(*(pmd)) = (unsigned long) (pte)) -#endif /* CONFIG_MMU */ - #endif /* _ASM_MICROBLAZE_PGALLOC_H */ diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h index 3fa1df90925e..9ae8d2c17dd5 100644 --- a/arch/microblaze/include/asm/pgtable.h +++ b/arch/microblaze/include/asm/pgtable.h @@ -14,47 +14,6 @@ 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__ @@ -491,8 +450,6 @@ void __init *early_get_page(void); #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ -#endif /* CONFIG_MMU */ - #ifndef __ASSEMBLY__ extern unsigned long ioremap_bot, ioremap_base; diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h index 1ff5a82b76b6..f4f3048cde4c 100644 --- a/arch/microblaze/include/asm/processor.h +++ b/arch/microblaze/include/asm/processor.h @@ -31,42 +31,6 @@ extern void ret_from_kernel_thread(void); # 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. @@ -133,5 +97,4 @@ extern struct dentry *of_debugfs_root; #endif # endif /* __ASSEMBLY__ */ -# endif /* CONFIG_MMU */ #endif /* _ASM_MICROBLAZE_PROCESSOR_H */ diff --git a/arch/microblaze/include/asm/registers.h b/arch/microblaze/include/asm/registers.h index ee81e1cba008..6b36693fc621 100644 --- a/arch/microblaze/include/asm/registers.h +++ b/arch/microblaze/include/asm/registers.h @@ -27,7 +27,6 @@ #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 */ @@ -43,5 +42,4 @@ # define ESR_DIZ (1<<11) /* Zone Protection */ # define ESR_S (1<<10) /* Store instruction */ -# endif /* CONFIG_MMU */ #endif /* _ASM_MICROBLAZE_REGISTERS_H */ diff --git a/arch/microblaze/include/asm/setup.h b/arch/microblaze/include/asm/setup.h index be10da9d87cb..a06cc1f97aa9 100644 --- a/arch/microblaze/include/asm/setup.h +++ b/arch/microblaze/include/asm/setup.h @@ -14,9 +14,7 @@ extern char cmd_line[COMMAND_LINE_SIZE]; extern char *klimit; -# ifdef CONFIG_MMU extern void mmu_reset(void); -# endif /* CONFIG_MMU */ void time_init(void); void init_IRQ(void); diff --git a/arch/microblaze/include/asm/tlbflush.h b/arch/microblaze/include/asm/tlbflush.h index 1200e2bf14bb..2038168ed128 100644 --- a/arch/microblaze/include/asm/tlbflush.h +++ b/arch/microblaze/include/asm/tlbflush.h @@ -8,8 +8,6 @@ #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 */ @@ -50,16 +48,4 @@ static inline void local_flush_tlb_range(struct vm_area_struct *vma, 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 */ diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h index 304b04ffea2f..c44b59470e45 100644 --- a/arch/microblaze/include/asm/uaccess.h +++ b/arch/microblaze/include/asm/uaccess.h @@ -30,35 +30,14 @@ */ # 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) { if (!size) @@ -77,15 +56,9 @@ ok: (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); diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile index dd71637437f4..15a20eb814ce 100644 --- a/arch/microblaze/kernel/Makefile +++ b/arch/microblaze/kernel/Makefile @@ -22,9 +22,9 @@ obj-y += dma.o exceptions.o \ 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 diff --git a/arch/microblaze/kernel/asm-offsets.c b/arch/microblaze/kernel/asm-offsets.c index c1b459c97571..6c69ce7be2e8 100644 --- a/arch/microblaze/kernel/asm-offsets.c +++ b/arch/microblaze/kernel/asm-offsets.c @@ -70,7 +70,6 @@ int main(int argc, char *argv[]) /* 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)); @@ -84,7 +83,6 @@ int main(int argc, char *argv[]) DEFINE(PGDIR, offsetof(struct thread_struct, pgdir)); BLANK(); -#endif /* struct thread_info */ DEFINE(TI_TASK, offsetof(struct thread_info, task)); diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S deleted file mode 100644 index 7e394fc2c439..000000000000 --- a/arch/microblaze/kernel/entry-nommu.S +++ /dev/null @@ -1,622 +0,0 @@ -/* - * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> - * 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 diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c index cf99c411503e..908788497b28 100644 --- a/arch/microblaze/kernel/exceptions.c +++ b/arch/microblaze/kernel/exceptions.c @@ -69,9 +69,7 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) 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", @@ -132,13 +130,10 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, 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", diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S index 14b276406153..ec2fcb545e64 100644 --- a/arch/microblaze/kernel/head.S +++ b/arch/microblaze/kernel/head.S @@ -34,7 +34,6 @@ #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> @@ -48,8 +47,6 @@ empty_zero_page: swapper_pg_dir: .space PAGE_SIZE -#endif /* CONFIG_MMU */ - .section .rodata .align 4 endian_check: @@ -108,8 +105,6 @@ _copy_fdt: addik r3, r3, -4 /* descrement loop */ no_fdt_arg: -#ifdef CONFIG_MMU - #ifndef CONFIG_CMDLINE_BOOL /* * handling command line @@ -329,7 +324,6 @@ turn_on_mmu: nop start_here: -#endif /* CONFIG_MMU */ /* Initialize small data anchors */ addik r13, r0, _KERNEL_SDA_BASE_ @@ -345,11 +339,6 @@ start_here: brald r15, r11 nop -#ifndef CONFIG_MMU - addik r15, r0, machine_halt - braid start_kernel - nop -#else /* * Initialize the MMU. */ @@ -383,4 +372,3 @@ kernel_load_context: nop rted r17, 0 /* enable MMU and jump to start_kernel */ nop -#endif /* CONFIG_MMU */ diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S index 54411de22fa6..07ea23965f81 100644 --- a/arch/microblaze/kernel/hw_exception_handler.S +++ b/arch/microblaze/kernel/hw_exception_handler.S @@ -80,7 +80,6 @@ /* Helpful Macros */ #define NUM_TO_REG(num) r ## num -#ifdef CONFIG_MMU #define RESTORE_STATE \ lwi r5, r1, 0; \ mts rmsr, r5; \ @@ -92,7 +91,6 @@ 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; \ @@ -102,10 +100,6 @@ 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) \ swi r3, r1, 4 * regnum; \ @@ -126,7 +120,6 @@ 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; @@ -193,7 +186,6 @@ .endm #endif -#endif /* CONFIG_MMU */ .extern other_exception_handler /* Defined in exception.c */ @@ -251,7 +243,6 @@ */ /* wrappers to restore state before coming to entry.S */ -#ifdef CONFIG_MMU .section .data .align 4 pt_pool_space: @@ -316,31 +307,24 @@ _MB_HW_ExceptionVectorTable: .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 @@ -350,18 +334,8 @@ _hw_exception_handler: 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 */ @@ -383,73 +357,6 @@ not_in_delay_slot: 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, @@ -463,7 +370,6 @@ handle_unaligned_ex: * 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 */ @@ -472,7 +378,7 @@ _no_delayslot: /* 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; @@ -558,25 +464,10 @@ ex_shw: 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). */ @@ -882,13 +773,7 @@ ex_handler_done: * 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 @@ -926,10 +811,8 @@ ex_handler_done: 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. @@ -1044,7 +927,6 @@ ex_unaligned_fixup: .word store6,ex_unaligned_fixup; .previous; .end _unaligned_data_exception -#endif /* CONFIG_MMU */ .global ex_handler_unhandled ex_handler_unhandled: @@ -1093,11 +975,7 @@ lw_r27: R3_TO_LWREG (27); 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); @@ -1131,13 +1009,8 @@ sw_r27: SWREG_TO_R3 (27); 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); @@ -1205,7 +1078,6 @@ sw_r28_vm: SWREG_TO_R3_VM_V (28); 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 diff --git a/arch/microblaze/kernel/microblaze_ksyms.c b/arch/microblaze/kernel/microblaze_ksyms.c index 51c43ee5e380..303aaf13573b 100644 --- a/arch/microblaze/kernel/microblaze_ksyms.c +++ b/arch/microblaze/kernel/microblaze_ksyms.c @@ -33,9 +33,7 @@ EXPORT_SYMBOL(memcpy); EXPORT_SYMBOL(memmove); #endif -#ifdef CONFIG_MMU EXPORT_SYMBOL(empty_zero_page); -#endif EXPORT_SYMBOL(mbc); diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c index a9e46e525cd0..3afda1823730 100644 --- a/arch/microblaze/kernel/process.c +++ b/arch/microblaze/kernel/process.c @@ -69,9 +69,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, 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; } @@ -81,9 +79,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, 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 @@ -105,7 +100,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, 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; /* @@ -130,13 +124,10 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) 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 @@ -145,7 +136,6 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) { return 0; /* MicroBlaze has no separate FPU registers */ } -#endif /* CONFIG_MMU */ void arch_cpu_idle(void) { diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c index 7fcf5279ad15..f417333eccae 100644 --- a/arch/microblaze/kernel/setup.c +++ b/arch/microblaze/kernel/setup.c @@ -190,12 +190,10 @@ static int microblaze_debugfs_init(void) } 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 diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c index 5a8d173d7b75..fc61eb0eb8dd 100644 --- a/arch/microblaze/kernel/signal.c +++ b/arch/microblaze/kernel/signal.c @@ -157,10 +157,8 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, 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)); @@ -192,7 +190,6 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, regs->r15 = ((unsigned long)frame->tramp)-8; address = ((unsigned long)frame->tramp); -#ifdef CONFIG_MMU pmdp = pmd_off(current->mm, address); preempt_disable(); @@ -208,10 +205,6 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, } pte_unmap(ptep); preempt_enable(); -#else - flush_icache_range(address, address + 8); - flush_dcache_range(address, address + 8); -#endif if (err) return -EFAULT; diff --git a/arch/microblaze/kernel/unwind.c b/arch/microblaze/kernel/unwind.c index 778a761af0a7..a530a7a6be7d 100644 --- a/arch/microblaze/kernel/unwind.c +++ b/arch/microblaze/kernel/unwind.c @@ -161,22 +161,12 @@ static void microblaze_unwind_inner(struct task_struct *task, * 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 @@ -215,16 +205,7 @@ static void microblaze_unwind_inner(struct task_struct *task, * 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; } diff --git a/arch/microblaze/mm/Makefile b/arch/microblaze/mm/Makefile index 1b16875cea70..cd8a844bf29e 100644 --- a/arch/microblaze/mm/Makefile +++ b/arch/microblaze/mm/Makefile @@ -5,5 +5,5 @@ obj-y := consistent.o init.o -obj-$(CONFIG_MMU) += pgtable.o mmu_context.o fault.o +obj-y += pgtable.o mmu_context.o fault.o obj-$(CONFIG_HIGHMEM) += highmem.o diff --git a/arch/microblaze/mm/consistent.c b/arch/microblaze/mm/consistent.c index 81dffe43b18c..b7ad4a98636d 100644 --- a/arch/microblaze/mm/consistent.c +++ b/arch/microblaze/mm/consistent.c @@ -21,32 +21,3 @@ void arch_dma_prep_coherent(struct page *page, size_t size) 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 */ diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c index 45da639bd22c..7129a20881ea 100644 --- a/arch/microblaze/mm/init.c +++ b/arch/microblaze/mm/init.c @@ -29,11 +29,6 @@ /* 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; /* @@ -82,13 +77,11 @@ static void highmem_setup(void) 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)); @@ -108,40 +101,6 @@ static void __init paging_init(void) 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 @@ -181,12 +140,6 @@ void __init mem_init(void) 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; @@ -330,8 +283,6 @@ void __init *early_get_page(void) NUMA_NO_NODE); } -#endif /* CONFIG_MMU */ - void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask) { void *p; diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c index 60a58c0015f2..557585f1be41 100644 --- a/arch/microblaze/pci/pci-common.c +++ b/arch/microblaze/pci/pci-common.c @@ -325,12 +325,10 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, * 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; |