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82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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* Includes memory-related architecture specific definitions and their
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* corresponding generic wrappers.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __GLUE_ARM_MEMORY_H__
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#define __GLUE_ARM_MEMORY_H__
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#include INC_GLUE(memlayout.h) /* Important generic definitions */
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#include INC_SUBARCH(mm.h)
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/* Generic definitions */
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#define PFN_SHIFT 12
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#define PAGE_BITS PFN_SHIFT
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#define PAGE_SIZE SZ_4K
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#define PAGE_MASK (PAGE_SIZE - 1)
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/* Aligns to the upper page (ceiling) FIXME: Must add a wraparound checker. */
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#define page_align_up(addr) ((((unsigned long)(addr)) + PAGE_MASK) & \
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(~PAGE_MASK))
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/* Aligns to the lower page (floor) */
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#define page_align(addr) (((unsigned long)(addr)) & \
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(~PAGE_MASK))
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#define is_aligned(val, size) (!(((unsigned long)(val)) & (((unsigned long)size) - 1)))
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#define is_page_aligned(val) (!(((unsigned long)(val)) & PAGE_MASK))
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#define page_boundary(x) is_page_aligned(x)
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/*
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* Align to given size.
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*
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* Note it must be an alignable size i.e. one that is a power of two.
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* E.g. 0x1000 would work but 0x1010 would not.
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*/
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#define align(addr, size) (((unsigned int)(addr)) & (~((unsigned long)size-1)))
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#define align_up(addr, size) ((((unsigned long)(addr)) + \
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((size) - 1)) & (~(((unsigned long)size) - 1)))
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/* The bytes left until the end of the page that x is in */
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#define TILL_PAGE_ENDS(x) (PAGE_SIZE - ((unsigned long)(x) & PAGE_MASK))
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/* Extract page frame number from address and vice versa. */
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#define __pfn(x) (((unsigned long)(x)) >> PAGE_BITS)
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#define __pfn_to_addr(x) (((unsigned long)(x)) << PAGE_BITS)
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/* Extract physical address from page table entry (pte) */
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#define __pte_to_addr(x) (((unsigned long)(x)) & ~PAGE_MASK)
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/* Minimum excess needed for word alignment */
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#define SZ_WORD sizeof(unsigned int)
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#define WORD_BITS 32
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#define WORD_BITS_LOG2 5
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#define BITWISE_GETWORD(x) ((x) >> WORD_BITS_LOG2) /* Divide by 32 */
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#define BITWISE_GETBIT(x) (1 << ((x) % WORD_BITS))
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/* Minimum stack alignment restriction across functions, exceptions */
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#define STACK_ALIGNMENT 8
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/* Endianness conversion */
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static inline void be32_to_cpu(unsigned int x)
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{
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char *p = (char *)&x;
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char tmp;
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/* Swap bytes */
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tmp = p[0];
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p[0] = p[3];
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p[3] = tmp;
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tmp = p[1];
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p[1] = p[2];
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p[2] = tmp;
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}
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struct ktcb;
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void task_init_registers(struct ktcb *task, unsigned long pc);
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#endif /* __GLUE_ARM_MEMORY_H__ */
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