acmacros.h

xen 3.2.2 源码

/******************************************************************************
 *
 * Name: acmacros.h - C macros for the entire subsystem.
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#ifndef __ACMACROS_H__
#define __ACMACROS_H__


/*
 * Data manipulation macros
 */
#define ACPI_LOWORD(l)                  ((u16)(u32)(l))
#define ACPI_HIWORD(l)                  ((u16)((((u32)(l)) >> 16) & 0xFFFF))
#define ACPI_LOBYTE(l)                  ((u8)(u16)(l))
#define ACPI_HIBYTE(l)                  ((u8)((((u16)(l)) >> 8) & 0xFF))

#define ACPI_SET_BIT(target,bit)        ((target) |= (bit))
#define ACPI_CLEAR_BIT(target,bit)      ((target) &= ~(bit))
#define ACPI_MIN(a,b)                   (((a)<(b))?(a):(b))


#if ACPI_MACHINE_WIDTH == 16

/*
 * For 16-bit addresses, we have to assume that the upper 32 bits
 * are zero.
 */
#define ACPI_LODWORD(l)                 ((u32)(l))
#define ACPI_HIDWORD(l)                 ((u32)(0))

#define ACPI_GET_ADDRESS(a)             ((a).lo)
#define ACPI_STORE_ADDRESS(a,b)         {(a).hi=0;(a).lo=(u32)(b);}
#define ACPI_VALID_ADDRESS(a)           ((a).hi | (a).lo)

#else
#ifdef ACPI_NO_INTEGER64_SUPPORT
/*
 * acpi_integer is 32-bits, no 64-bit support on this platform
 */
#define ACPI_LODWORD(l)                 ((u32)(l))
#define ACPI_HIDWORD(l)                 ((u32)(0))

#define ACPI_GET_ADDRESS(a)             (a)
#define ACPI_STORE_ADDRESS(a,b)         ((a)=(b))
#define ACPI_VALID_ADDRESS(a)           (a)

#else

/*
 * Full 64-bit address/integer on both 32-bit and 64-bit platforms
 */
#define ACPI_LODWORD(l)                 ((u32)(u64)(l))
#define ACPI_HIDWORD(l)                 ((u32)(((*(struct uint64_struct *)(void *)(&l))).hi))

#define ACPI_GET_ADDRESS(a)             (a)
#define ACPI_STORE_ADDRESS(a,b)         ((a)=(acpi_physical_address)(b))
#define ACPI_VALID_ADDRESS(a)           (a)
#endif
#endif

/*
 * printf() format helpers
 */

/* Split 64-bit integer into two 32-bit values. Use with %8.8X%8.8X */

#define ACPI_FORMAT_UINT64(i)           ACPI_HIDWORD(i),ACPI_LODWORD(i)

/*
 * Extract a byte of data using a pointer.  Any more than a byte and we
 * get into potential aligment issues -- see the STORE macros below
 */
#define ACPI_GET8(addr)                 (*(u8*)(addr))

/* Pointer arithmetic */

#define ACPI_PTR_ADD(t,a,b)             (t *) (void *)((char *)(a) + (acpi_native_uint)(b))
#define ACPI_PTR_DIFF(a,b)              (acpi_native_uint) ((char *)(a) - (char *)(b))

/* Pointer/Integer type conversions */

#define ACPI_TO_POINTER(i)              ACPI_PTR_ADD (void, (void *) NULL,(acpi_native_uint)i)
#define ACPI_TO_INTEGER(p)              ACPI_PTR_DIFF (p,(void *) NULL)
#define ACPI_OFFSET(d,f)                (acpi_size) ACPI_PTR_DIFF (&(((d *)0)->f),(void *) NULL)
#define ACPI_FADT_OFFSET(f)             ACPI_OFFSET (FADT_DESCRIPTOR, f)

#define ACPI_CAST_PTR(t, p)             ((t *)(void *)(p))
#define ACPI_CAST_INDIRECT_PTR(t, p)    ((t **)(void *)(p))

#if ACPI_MACHINE_WIDTH == 16
#define ACPI_STORE_POINTER(d,s)         ACPI_MOVE_32_TO_32(d,s)
#define ACPI_PHYSADDR_TO_PTR(i)         (void *)(i)
#define ACPI_PTR_TO_PHYSADDR(i)         (u32) (char *)(i)
#else
#define ACPI_PHYSADDR_TO_PTR(i)         ACPI_TO_POINTER(i)
#define ACPI_PTR_TO_PHYSADDR(i)         ACPI_TO_INTEGER(i)
#endif

/*
 * Macros for moving data around to/from buffers that are possibly unaligned.
 * If the hardware supports the transfer of unaligned data, just do the store.
 * Otherwise, we have to move one byte at a time.
 */
#ifdef ACPI_BIG_ENDIAN
/*
 * Macros for big-endian machines
 */

/* This macro sets a buffer index, starting from the end of the buffer */

#define ACPI_BUFFER_INDEX(buf_len,buf_offset,byte_gran) ((buf_len) - (((buf_offset)+1) * (byte_gran)))

/* These macros reverse the bytes during the move, converting little-endian to big endian */

	 /* Big Endian      <==        Little Endian */
	 /*  Hi...Lo                     Lo...Hi     */
/* 16-bit source, 16/32/64 destination */

#define ACPI_MOVE_16_TO_16(d,s)         {((  u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[1];\
			  ((  u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[0];}

#define ACPI_MOVE_16_TO_32(d,s)         {(*(u32 *)(void *)(d))=0;\
					  ((u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[1];\
					  ((u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[0];}

#define ACPI_MOVE_16_TO_64(d,s)         {(*(u64 *)(void *)(d))=0;\
							   ((u8 *)(void *)(d))[6] = ((u8 *)(void *)(s))[1];\
							   ((u8 *)(void *)(d))[7] = ((u8 *)(void *)(s))[0];}

/* 32-bit source, 16/32/64 destination */

#define ACPI_MOVE_32_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */

#define ACPI_MOVE_32_TO_32(d,s)         {((  u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[3];\
									  ((  u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[2];\
									  ((  u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[1];\
									  ((  u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[0];}

#define ACPI_MOVE_32_TO_64(d,s)         {(*(u64 *)(void *)(d))=0;\
										   ((u8 *)(void *)(d))[4] = ((u8 *)(void *)(s))[3];\
										   ((u8 *)(void *)(d))[5] = ((u8 *)(void *)(s))[2];\
										   ((u8 *)(void *)(d))[6] = ((u8 *)(void *)(s))[1];\
										   ((u8 *)(void *)(d))[7] = ((u8 *)(void *)(s))[0];}

/* 64-bit source, 16/32/64 destination */

#define ACPI_MOVE_64_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */

#define ACPI_MOVE_64_TO_32(d,s)         ACPI_MOVE_32_TO_32(d,s)    /* Truncate to 32 */

#define ACPI_MOVE_64_TO_64(d,s)         {((  u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[7];\
										 ((  u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[6];\
										 ((  u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[5];\
										 ((  u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[4];\
										 ((  u8 *)(void *)(d))[4] = ((u8 *)(void *)(s))[3];\
										 ((  u8 *)(void *)(d))[5] = ((u8 *)(void *)(s))[2];\
										 ((  u8 *)(void *)(d))[6] = ((u8 *)(void *)(s))[1];\
										 ((  u8 *)(void *)(d))[7] = ((u8 *)(void *)(s))[0];}
#else
/*
 * Macros for little-endian machines
 */

/* This macro sets a buffer index, starting from the beginning of the buffer */

#define ACPI_BUFFER_INDEX(buf_len,buf_offset,byte_gran) (buf_offset)

#ifdef ACPI_MISALIGNED_TRANSFERS

/* The hardware supports unaligned transfers, just do the little-endian move */

#if ACPI_MACHINE_WIDTH == 16

/* No 64-bit integers */
/* 16-bit source, 16/32/64 destination */

#define ACPI_MOVE_16_TO_16(d,s)         *(u16 *)(void *)(d) = *(u16 *)(void *)(s)
#define ACPI_MOVE_16_TO_32(d,s)         *(u32 *)(void *)(d) = *(u16 *)(void *)(s)
#define ACPI_MOVE_16_TO_64(d,s)         ACPI_MOVE_16_TO_32(d,s)

/* 32-bit source, 16/32/64 destination */

#define ACPI_MOVE_32_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */
#define ACPI_MOVE_32_TO_32(d,s)         *(u32 *)(void *)(d) = *(u32 *)(void *)(s)
#define ACPI_MOVE_32_TO_64(d,s)         ACPI_MOVE_32_TO_32(d,s)

/* 64-bit source, 16/32/64 destination */

#define ACPI_MOVE_64_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */
#define ACPI_MOVE_64_TO_32(d,s)         ACPI_MOVE_32_TO_32(d,s)    /* Truncate to 32 */
#define ACPI_MOVE_64_TO_64(d,s)         ACPI_MOVE_32_TO_32(d,s)

#else
/* 16-bit source, 16/32/64 destination */

#define ACPI_MOVE_16_TO_16(d,s)         *(u16 *)(void *)(d) = *(u16 *)(void *)(s)
#define ACPI_MOVE_16_TO_32(d,s)         *(u32 *)(void *)(d) = *(u16 *)(void *)(s)
#define ACPI_MOVE_16_TO_64(d,s)         *(u64 *)(void *)(d) = *(u16 *)(void *)(s)

/* 32-bit source, 16/32/64 destination */

#define ACPI_MOVE_32_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */
#define ACPI_MOVE_32_TO_32(d,s)         *(u32 *)(void *)(d) = *(u32 *)(void *)(s)
#define ACPI_MOVE_32_TO_64(d,s)         *(u64 *)(void *)(d) = *(u32 *)(void *)(s)

/* 64-bit source, 16/32/64 destination */

#define ACPI_MOVE_64_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */
#define ACPI_MOVE_64_TO_32(d,s)         ACPI_MOVE_32_TO_32(d,s)    /* Truncate to 32 */
#define ACPI_MOVE_64_TO_64(d,s)         *(u64 *)(void *)(d) = *(u64 *)(void *)(s)
#endif

#else
/*
 * The hardware does not support unaligned transfers.  We must move the
 * data one byte at a time.  These macros work whether the source or
 * the destination (or both) is/are unaligned.  (Little-endian move)
 */

/* 16-bit source, 16/32/64 destination */

#define ACPI_MOVE_16_TO_16(d,s)         {((  u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[0];\
										 ((  u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[1];}

#define ACPI_MOVE_16_TO_32(d,s)         {(*(u32 *)(void *)(d)) = 0; ACPI_MOVE_16_TO_16(d,s);}
#define ACPI_MOVE_16_TO_64(d,s)         {(*(u64 *)(void *)(d)) = 0; ACPI_MOVE_16_TO_16(d,s);}

/* 32-bit source, 16/32/64 destination */

#define ACPI_MOVE_32_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */

#define ACPI_MOVE_32_TO_32(d,s)         {((  u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[0];\
										 ((  u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[1];\
										 ((  u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[2];\
										 ((  u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[3];}

#define ACPI_MOVE_32_TO_64(d,s)         {(*(u64 *)(void *)(d)) = 0; ACPI_MOVE_32_TO_32(d,s);}

/* 64-bit source, 16/32/64 destination */

#define ACPI_MOVE_64_TO_16(d,s)         ACPI_MOVE_16_TO_16(d,s)    /* Truncate to 16 */
#define ACPI_MOVE_64_TO_32(d,s)         ACPI_MOVE_32_TO_32(d,s)    /* Truncate to 32 */
#define ACPI_MOVE_64_TO_64(d,s)         {((  u8 *)(void *)(d))[0] = ((u8 *)(void *)(s))[0];\
										 ((  u8 *)(void *)(d))[1] = ((u8 *)(void *)(s))[1];\
										 ((  u8 *)(void *)(d))[2] = ((u8 *)(void *)(s))[2];\
										 ((  u8 *)(void *)(d))[3] = ((u8 *)(void *)(s))[3];\
										 ((  u8 *)(void *)(d))[4] = ((u8 *)(void *)(s))[4];\
										 ((  u8 *)(void *)(d))[5] = ((u8 *)(void *)(s))[5];\
										 ((  u8 *)(void *)(d))[6] = ((u8 *)(void *)(s))[6];\
										 ((  u8 *)(void *)(d))[7] = ((u8 *)(void *)(s))[7];}
#endif
#endif

/* Macros based on machine integer width */

#if ACPI_MACHINE_WIDTH == 16
#define ACPI_MOVE_SIZE_TO_16(d,s)       ACPI_MOVE_16_TO_16(d,s)

#elif ACPI_MACHINE_WIDTH == 32
#define ACPI_MOVE_SIZE_TO_16(d,s)       ACPI_MOVE_32_TO_16(d,s)

#elif ACPI_MACHINE_WIDTH == 64
#define ACPI_MOVE_SIZE_TO_16(d,s)       ACPI_MOVE_64_TO_16(d,s)

#else
#error unknown ACPI_MACHINE_WIDTH
#endif


/*
 * Fast power-of-two math macros for non-optimized compilers
 */
#define _ACPI_DIV(value,power_of2)      ((u32) ((value) >> (power_of2)))
#define _ACPI_MUL(value,power_of2)      ((u32) ((value) << (power_of2)))
#define _ACPI_MOD(value,divisor)        ((u32) ((value) & ((divisor) -1)))

#define ACPI_DIV_2(a)                   _ACPI_DIV(a,1)
#define ACPI_MUL_2(a)                   _ACPI_MUL(a,1)
#define ACPI_MOD_2(a)                   _ACPI_MOD(a,2)

#define ACPI_DIV_4(a)                   _ACPI_DIV(a,2)
#define ACPI_MUL_4(a)                   _ACPI_MUL(a,2)
#define ACPI_MOD_4(a)                   _ACPI_MOD(a,4)

#define ACPI_DIV_8(a)                   _ACPI_DIV(a,3)
#define ACPI_MUL_8(a)                   _ACPI_MUL(a,3)
#define ACPI_MOD_8(a)                   _ACPI_MOD(a,8)

#define ACPI_DIV_16(a)                  _ACPI_DIV(a,4)
#define ACPI_MUL_16(a)                  _ACPI_MUL(a,4)
#define ACPI_MOD_16(a)                  _ACPI_MOD(a,16)


/*
 * Rounding macros (Power of two boundaries only)
 */
#define ACPI_ROUND_DOWN(value,boundary)      (((acpi_native_uint)(value)) & (~(((acpi_native_uint) boundary)-1)))
#define ACPI_ROUND_UP(value,boundary)        ((((acpi_native_uint)(value)) + (((acpi_native_uint) boundary)-1)) & (~(((acpi_native_uint) boundary)-1)))

#define ACPI_ROUND_DOWN_TO_32_BITS(a)        ACPI_ROUND_DOWN(a,4)
#define ACPI_ROUND_DOWN_TO_64_BITS(a)        ACPI_ROUND_DOWN(a,8)