mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
daba25d6e0
This patch adds default 64-bit mathematics in aclinux.h using do_div(). As do_div() can be used for all Linux architectures, this can also be used as stub macros for ACPICA 64-bit mathematics. These macros are required by drivers/acpi/utmath.c when ACPI_USE_NATIVE_DIVIDE is not defined. It is used by ACPICA, so currently this is only meaningful to CONFIG_ACPI builds. So the kernel will not use these macros unless CONFIG_ACPI is defined and ACPI_USE_DIVIDE is not defined. For 64-bit kernels: In include/acpi/actypes.h, for ACPI_MACHINE_WIDTH=64, ACPI_USE_NATIVE_DIVIDE will be defined, thus these macros are not used. In include/acpi/platform/aclinux.h, for __KERNEL__ surrounded code, ACPI_MACHINE_WIDTH is defined to be BITS_PER_LONG. So all 64-bit kernels do not use these macros. For 32-bit kernels: As mentioned above, these macros will be used when BITS_PER_LONG is 32. Thus currently the i328 kernels are the only users for these macros. But they won't use this default implementation provided by this patch, because in arch/x86/include/asm/acenv.h, there are already overrides implemented. So these default macros are not used by 32-bit x86 (i386) kernels. These macros will only be used by future non x86 32-bit architectures that try to support ACPI in Linux kernel. During the period they do not have arch specific implementations of such macros, we can avoid build errors for them. And since they can see ACPICA functioning without implementing any arch specific environment tunings, we can also avoid function errors for them. As this implementation is not performance friendly, those architectures still need to implement real support in the end. Signed-off-by: Lv Zheng <lv.zheng@intel.com> [rjw: Changelog] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
135 lines
4.2 KiB
C
135 lines
4.2 KiB
C
/******************************************************************************
|
|
*
|
|
* Name: aclinuxex.h - Extra OS specific defines, etc. for Linux
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2014, Intel Corp.
|
|
* 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 __ACLINUXEX_H__
|
|
#define __ACLINUXEX_H__
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef ACPI_USE_NATIVE_DIVIDE
|
|
|
|
#ifndef ACPI_DIV_64_BY_32
|
|
#define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
|
|
do { \
|
|
u64 (__n) = ((u64) n_hi) << 32 | (n_lo); \
|
|
(r32) = do_div ((__n), (d32)); \
|
|
(q32) = (u32) (__n); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef ACPI_SHIFT_RIGHT_64
|
|
#define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
|
|
do { \
|
|
(n_lo) >>= 1; \
|
|
(n_lo) |= (((n_hi) & 1) << 31); \
|
|
(n_hi) >>= 1; \
|
|
} while (0)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Overrides for in-kernel ACPICA
|
|
*/
|
|
acpi_status __init acpi_os_initialize(void);
|
|
|
|
acpi_status acpi_os_terminate(void);
|
|
|
|
/*
|
|
* The irqs_disabled() check is for resume from RAM.
|
|
* Interrupts are off during resume, just like they are for boot.
|
|
* However, boot has (system_state != SYSTEM_RUNNING)
|
|
* to quiet __might_sleep() in kmalloc() and resume does not.
|
|
*/
|
|
static inline void *acpi_os_allocate(acpi_size size)
|
|
{
|
|
return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
|
|
}
|
|
|
|
static inline void *acpi_os_allocate_zeroed(acpi_size size)
|
|
{
|
|
return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
|
|
}
|
|
|
|
static inline void acpi_os_free(void *memory)
|
|
{
|
|
kfree(memory);
|
|
}
|
|
|
|
static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
|
|
{
|
|
return kmem_cache_zalloc(cache,
|
|
irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
|
|
}
|
|
|
|
static inline acpi_thread_id acpi_os_get_thread_id(void)
|
|
{
|
|
return (acpi_thread_id) (unsigned long)current;
|
|
}
|
|
|
|
/*
|
|
* When lockdep is enabled, the spin_lock_init() macro stringifies it's
|
|
* argument and uses that as a name for the lock in debugging.
|
|
* By executing spin_lock_init() in a macro the key changes from "lock" for
|
|
* all locks to the name of the argument of acpi_os_create_lock(), which
|
|
* prevents lockdep from reporting false positives for ACPICA locks.
|
|
*/
|
|
#define acpi_os_create_lock(__handle) \
|
|
({ \
|
|
spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
|
|
if (lock) { \
|
|
*(__handle) = lock; \
|
|
spin_lock_init(*(__handle)); \
|
|
} \
|
|
lock ? AE_OK : AE_NO_MEMORY; \
|
|
})
|
|
|
|
/*
|
|
* OSL interfaces added by Linux
|
|
*/
|
|
void early_acpi_os_unmap_memory(void __iomem * virt, acpi_size size);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ACLINUXEX_H__ */
|