diff options
Diffstat (limited to 'arch/arm/include/asm/memory.h')
| -rw-r--r-- | arch/arm/include/asm/memory.h | 250 |
1 files changed, 173 insertions, 77 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 23c2e8e5c0f..2b751464d6f 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -15,8 +15,14 @@ #include <linux/compiler.h> #include <linux/const.h> +#include <linux/types.h> +#include <linux/sizes.h> + +#include <asm/cache.h> + +#ifdef CONFIG_NEED_MACH_MEMORY_H #include <mach/memory.h> -#include <asm/sizes.h> +#endif /* * Allow for constants defined here to be used from assembly code @@ -24,31 +30,32 @@ */ #define UL(x) _AC(x, UL) +/* PAGE_OFFSET - the virtual address of the start of the kernel image */ +#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) + #ifdef CONFIG_MMU /* - * PAGE_OFFSET - the virtual address of the start of the kernel image * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area */ -#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) -#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) -#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) +#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) +#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) /* * The maximum size of a 26-bit user space task. */ -#define TASK_SIZE_26 UL(0x04000000) +#define TASK_SIZE_26 (UL(1) << 26) /* * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 32MB of the kernel text. */ #ifndef CONFIG_THUMB2_KERNEL -#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) +#define MODULES_VADDR (PAGE_OFFSET - SZ_16M) #else /* smaller range for Thumb-2 symbols relocation (2^24)*/ -#define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) +#define MODULES_VADDR (PAGE_OFFSET - SZ_8M) #endif #if TASK_SIZE > MODULES_VADDR @@ -76,17 +83,6 @@ */ #define IOREMAP_MAX_ORDER 24 -/* - * Size of DMA-consistent memory region. Must be multiple of 2M, - * between 2MB and 14MB inclusive. - */ -#ifndef CONSISTENT_DMA_SIZE -#define CONSISTENT_DMA_SIZE SZ_2M -#endif - -#define CONSISTENT_END (0xffe00000UL) -#define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE) - #else /* CONFIG_MMU */ /* @@ -103,23 +99,17 @@ #define TASK_UNMAPPED_BASE UL(0x00000000) #endif -#ifndef PHYS_OFFSET -#define PHYS_OFFSET UL(CONFIG_DRAM_BASE) -#endif - #ifndef END_MEM #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) #endif -#ifndef PAGE_OFFSET -#define PAGE_OFFSET (PHYS_OFFSET) -#endif - /* * The module can be at any place in ram in nommu mode. */ #define MODULES_END (END_MEM) -#define MODULES_VADDR (PHYS_OFFSET) +#define MODULES_VADDR PAGE_OFFSET + +#define XIP_VIRT_ADDR(physaddr) (physaddr) #endif /* !CONFIG_MMU */ @@ -133,20 +123,10 @@ #endif /* - * Physical vs virtual RAM address space conversion. These are - * private definitions which should NOT be used outside memory.h - * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. - */ -#ifndef __virt_to_phys -#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) -#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) -#endif - -/* * Convert a physical address to a Page Frame Number and back */ -#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) -#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) +#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) +#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) /* * Convert a page to/from a physical address @@ -154,33 +134,143 @@ #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) -#ifndef __ASSEMBLY__ - /* - * The DMA mask corresponding to the maximum bus address allocatable - * using GFP_DMA. The default here places no restriction on DMA - * allocations. This must be the smallest DMA mask in the system, - * so a successful GFP_DMA allocation will always satisfy this. + * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed + * around in head.S and proc-*.S are shifted by this amount, in order to + * leave spare high bits for systems with physical address extension. This + * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but + * gives us about 38-bits or so. */ -#ifndef ISA_DMA_THRESHOLD -#define ISA_DMA_THRESHOLD (0xffffffffULL) +#ifdef CONFIG_ARM_LPAE +#define ARCH_PGD_SHIFT L1_CACHE_SHIFT +#else +#define ARCH_PGD_SHIFT 0 #endif +#define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) -#ifndef arch_adjust_zones -#define arch_adjust_zones(size,holes) do { } while (0) -#elif !defined(CONFIG_ZONE_DMA) -#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" +/* + * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical + * memory. This is used for XIP and NoMMU kernels, or by kernels which + * have their own mach/memory.h. Assembly code must always use + * PLAT_PHYS_OFFSET and not PHYS_OFFSET. + */ +#ifndef PLAT_PHYS_OFFSET +#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) #endif +#ifndef __ASSEMBLY__ + /* + * Physical vs virtual RAM address space conversion. These are + * private definitions which should NOT be used outside memory.h + * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. + * * PFNs are used to describe any physical page; this means * PFN 0 == physical address 0. - * - * This is the PFN of the first RAM page in the kernel - * direct-mapped view. We assume this is the first page - * of RAM in the mem_map as well. */ -#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) +#if defined(__virt_to_phys) +#define PHYS_OFFSET PLAT_PHYS_OFFSET +#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) + +#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) + +#elif defined(CONFIG_ARM_PATCH_PHYS_VIRT) + +/* + * Constants used to force the right instruction encodings and shifts + * so that all we need to do is modify the 8-bit constant field. + */ +#define __PV_BITS_31_24 0x81000000 +#define __PV_BITS_7_0 0x81 + +extern unsigned long __pv_phys_pfn_offset; +extern u64 __pv_offset; +extern void fixup_pv_table(const void *, unsigned long); +extern const void *__pv_table_begin, *__pv_table_end; + +#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) +#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) + +#define virt_to_pfn(kaddr) \ + ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ + PHYS_PFN_OFFSET) + +#define __pv_stub(from,to,instr,type) \ + __asm__("@ __pv_stub\n" \ + "1: " instr " %0, %1, %2\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 1b\n" \ + " .popsection\n" \ + : "=r" (to) \ + : "r" (from), "I" (type)) + +#define __pv_stub_mov_hi(t) \ + __asm__ volatile("@ __pv_stub_mov\n" \ + "1: mov %R0, %1\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 1b\n" \ + " .popsection\n" \ + : "=r" (t) \ + : "I" (__PV_BITS_7_0)) + +#define __pv_add_carry_stub(x, y) \ + __asm__ volatile("@ __pv_add_carry_stub\n" \ + "1: adds %Q0, %1, %2\n" \ + " adc %R0, %R0, #0\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 1b\n" \ + " .popsection\n" \ + : "+r" (y) \ + : "r" (x), "I" (__PV_BITS_31_24) \ + : "cc") + +static inline phys_addr_t __virt_to_phys(unsigned long x) +{ + phys_addr_t t; + + if (sizeof(phys_addr_t) == 4) { + __pv_stub(x, t, "add", __PV_BITS_31_24); + } else { + __pv_stub_mov_hi(t); + __pv_add_carry_stub(x, t); + } + return t; +} + +static inline unsigned long __phys_to_virt(phys_addr_t x) +{ + unsigned long t; + + /* + * 'unsigned long' cast discard upper word when + * phys_addr_t is 64 bit, and makes sure that inline + * assembler expression receives 32 bit argument + * in place where 'r' 32 bit operand is expected. + */ + __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); + return t; +} + +#else + +#define PHYS_OFFSET PLAT_PHYS_OFFSET +#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) + +static inline phys_addr_t __virt_to_phys(unsigned long x) +{ + return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; +} + +static inline unsigned long __phys_to_virt(phys_addr_t x) +{ + return x - PHYS_OFFSET + PAGE_OFFSET; +} + +#define virt_to_pfn(kaddr) \ + ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ + PHYS_PFN_OFFSET) + +#endif /* * These are *only* valid on the kernel direct mapped RAM memory. @@ -188,23 +278,40 @@ * translation for translating DMA addresses. Use the driver * DMA support - see dma-mapping.h. */ -static inline unsigned long virt_to_phys(void *x) +static inline phys_addr_t virt_to_phys(const volatile void *x) { return __virt_to_phys((unsigned long)(x)); } -static inline void *phys_to_virt(unsigned long x) +static inline void *phys_to_virt(phys_addr_t x) { - return (void *)(__phys_to_virt((unsigned long)(x))); + return (void *)__phys_to_virt(x); } /* * Drivers should NOT use these either. */ #define __pa(x) __virt_to_phys((unsigned long)(x)) -#define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) +#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) +extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); + +/* + * These are for systems that have a hardware interconnect supported alias of + * physical memory for idmap purposes. Most cases should leave these + * untouched. + */ +static inline phys_addr_t __virt_to_idmap(unsigned long x) +{ + if (arch_virt_to_idmap) + return arch_virt_to_idmap(x); + else + return __virt_to_phys(x); +} + +#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) + /* * Virtual <-> DMA view memory address translations * Again, these are *only* valid on the kernel direct mapped RAM @@ -218,6 +325,7 @@ static inline void *phys_to_virt(unsigned long x) #define __bus_to_pfn(x) __phys_to_pfn(x) #endif +#ifdef CONFIG_VIRT_TO_BUS static inline __deprecated unsigned long virt_to_bus(void *x) { return __virt_to_bus((unsigned long)x); @@ -227,16 +335,11 @@ static inline __deprecated void *bus_to_virt(unsigned long x) { return (void *)__bus_to_virt(x); } +#endif /* * Conversion between a struct page and a physical address. * - * Note: when converting an unknown physical address to a - * struct page, the resulting pointer must be validated - * using VALID_PAGE(). It must return an invalid struct page - * for any physical address not corresponding to a system - * RAM address. - * * page_to_pfn(page) convert a struct page * to a PFN number * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * * @@ -245,16 +348,9 @@ static inline __deprecated void *bus_to_virt(unsigned long x) */ #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET -#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) -#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) - -/* - * Optional coherency support. Currently used only by selected - * Intel XSC3-based systems. - */ -#ifndef arch_is_coherent -#define arch_is_coherent() 0 -#endif +#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) +#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ + && pfn_valid(virt_to_pfn(kaddr))) #endif |