3 * Copyright (c) 2009, Microsoft Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
28 #include <linux/highmem.h>
29 #include <linux/vmalloc.h>
30 #include <linux/ioport.h>
31 #include <linux/irq.h>
32 #include <linux/interrupt.h>
33 #include <linux/sched.h>
34 #include <linux/wait.h>
35 #include <linux/spinlock.h>
36 #include <linux/workqueue.h>
37 #include <linux/kernel.h>
38 #include <linux/jiffies.h>
39 #include <linux/delay.h>
40 #include <linux/time.h>
42 #include <linux/bitops.h>
43 #include <linux/slab.h>
46 struct osd_callback_struct {
47 struct work_struct work;
48 void (*callback)(void *);
52 void *osd_VirtualAllocExec(unsigned int size)
55 return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL_EXEC);
57 return __vmalloc(size, GFP_KERNEL,
58 __pgprot(__PAGE_KERNEL & (~_PAGE_NX)));
62 void *osd_PageAlloc(unsigned int count)
66 p = (void *)__get_free_pages(GFP_KERNEL, get_order(count * PAGE_SIZE));
68 memset(p, 0, count * PAGE_SIZE);
71 /* struct page* page = alloc_page(GFP_KERNEL|__GFP_ZERO); */
74 /* BUGBUG: We need to use kmap in case we are in HIMEM region */
75 /* p = page_address(page); */
76 /* if (p) memset(p, 0, PAGE_SIZE); */
79 EXPORT_SYMBOL_GPL(osd_PageAlloc);
81 void osd_PageFree(void *page, unsigned int count)
83 free_pages((unsigned long)page, get_order(count * PAGE_SIZE));
84 /*struct page* p = virt_to_page(page);
87 EXPORT_SYMBOL_GPL(osd_PageFree);
89 struct osd_waitevent *osd_WaitEventCreate(void)
91 struct osd_waitevent *wait = kmalloc(sizeof(struct osd_waitevent),
97 init_waitqueue_head(&wait->event);
100 EXPORT_SYMBOL_GPL(osd_WaitEventCreate);
102 void osd_WaitEventSet(struct osd_waitevent *waitEvent)
104 waitEvent->condition = 1;
105 wake_up_interruptible(&waitEvent->event);
107 EXPORT_SYMBOL_GPL(osd_WaitEventSet);
109 int osd_WaitEventWait(struct osd_waitevent *waitEvent)
113 ret = wait_event_interruptible(waitEvent->event,
114 waitEvent->condition);
115 waitEvent->condition = 0;
118 EXPORT_SYMBOL_GPL(osd_WaitEventWait);
120 int osd_WaitEventWaitEx(struct osd_waitevent *waitEvent, u32 TimeoutInMs)
124 ret = wait_event_interruptible_timeout(waitEvent->event,
125 waitEvent->condition,
126 msecs_to_jiffies(TimeoutInMs));
127 waitEvent->condition = 0;
130 EXPORT_SYMBOL_GPL(osd_WaitEventWaitEx);
132 static void osd_callback_work(struct work_struct *work)
134 struct osd_callback_struct *cb = container_of(work,
135 struct osd_callback_struct,
137 (cb->callback)(cb->data);
141 int osd_schedule_callback(struct workqueue_struct *wq,
142 void (*func)(void *),
145 struct osd_callback_struct *cb;
147 cb = kmalloc(sizeof(*cb), GFP_KERNEL);
149 printk(KERN_ERR "unable to allocate memory in osd_schedule_callback\n");
155 INIT_WORK(&cb->work, osd_callback_work);
156 return queue_work(wq, &cb->work);