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/*

 * Includes memory-related architecture specific definitions and their

 * corresponding generic wrappers.

 *

 * Copyright (C) 2007 Bahadir Balban

 */

#ifndef __GLUE_ARM_MEMORY_H__

#define __GLUE_ARM_MEMORY_H__

#include INC_GLUE(memlayout.h) /* Important generic definitions */

#include INC_SUBARCH(mm.h)

/* Generic definitions */

#define PFN_SHIFT                       12

#define PAGE_BITS                       PFN_SHIFT

#define PAGE_SIZE                       SZ_4K

#define PAGE_MASK                       (PAGE_SIZE - 1)

/* Aligns to the upper page (ceiling) FIXME: Must add a wraparound checker. */

#define page_align_up(addr)             ((((unsigned long)(addr)) + PAGE_MASK) & \

                                         (~PAGE_MASK))

/* Aligns to the lower page (floor) */

#define page_align(addr)                (((unsigned long)(addr)) &  \

                                         (~PAGE_MASK))

#define is_aligned(val, size)           (!(((unsigned long)(val)) & (((unsigned long)size) - 1)))

#define is_page_aligned(val)            (!(((unsigned long)(val)) & PAGE_MASK))

#define page_boundary(x)                is_page_aligned(x)

/*

 * Align to given size.

 *

 * Note it must be an alignable size i.e. one that is a power of two.

 * E.g. 0x1000 would work but 0x1010 would not.

 */

#define align(addr, size)               (((unsigned int)(addr)) & (~((unsigned long)size-1)))

#define align_up(addr, size)            ((((unsigned long)(addr)) + \

                                        ((size) - 1)) & (~(((unsigned long)size) - 1)))

/* The bytes left until the end of the page that x is in */

#define TILL_PAGE_ENDS(x)       (PAGE_SIZE - ((unsigned long)(x) & PAGE_MASK))

/* Extract page frame number from address and vice versa. */

#define __pfn(x)                (((unsigned long)(x)) >> PAGE_BITS)

#define __pfn_to_addr(x)        (((unsigned long)(x)) << PAGE_BITS)

/* Extract physical address from page table entry (pte) */

#define __pte_to_addr(x)        (((unsigned long)(x)) & ~PAGE_MASK)

/* Minimum excess needed for word alignment */

#define SZ_WORD                         sizeof(unsigned int)

#define WORD_BITS                       32

#define WORD_BITS_LOG2                  5

#define BITWISE_GETWORD(x)      ((x) >> WORD_BITS_LOG2) /* Divide by 32 */

#define BITWISE_GETBIT(x)       (1 << ((x) % WORD_BITS))

/* Minimum stack alignment restriction across functions, exceptions */

#define STACK_ALIGNMENT                         8

/* Endianness conversion */

static inline void be32_to_cpu(unsigned int x)

{

        char *p = (char *)&x;

        char tmp;

        /* Swap bytes */

        tmp = p[0];

        p[0] = p[3];

        p[3] = tmp;

        tmp = p[1];

        p[1] = p[2];

        p[2] = tmp;

}

struct ktcb;

void task_init_registers(struct ktcb *task, unsigned long pc);

#endif /* __GLUE_ARM_MEMORY_H__ */