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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-armnommu/] [proc-armo/] [semaphore.h] - Blame information for rev 1765

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/*
 * linux/include/asm-arm/proc-armo/semaphore.h
 */
#ifndef __ASM_PROC_SEMAPHORE_H
#define __ASM_PROC_SEMAPHORE_H
 
/*
 * This is ugly, but we want the default case to fall through.
 * "__down" is the actual routine that waits...
 */
extern inline void down(struct semaphore * sem)
{
        __asm__ __volatile__ ("
        @ atomic down operation
        mov     r0, pc
        orr     r1, r0, #0x08000000
        and     r0, r0, #0x0c000003
        teqp    r1, #0
        ldr     r1, [%0]
        subs    r1, r1, #1
        str     r1, [%0]
        mov     r1, pc, lsr #28
        teqp    r0, r1, lsl #28
        movmi   r0, %0
        blmi    " SYMBOL_NAME_STR(__down)
                : : "r" (sem) : "r0", "r1", "r2", "r3", "ip", "lr", "cc");
}
 
/*
 * This is ugly, but we want the default case to fall through.
 * "__down_interruptible" is the actual routine that waits...
 */
extern inline int down_interruptible (struct semaphore * sem)
{
        int result;
        __asm__ __volatile__ ("
        @ atomic down operation
        mov     r0, pc
        orr     r1, r0, #0x08000000
        and     r0, r0, #0x0c000003
        teqp    r1, #0
        ldr     r1, [%1]
        subs    r1, r1, #1
        str     r1, [%1]
        mov     r1, pc, lsr #28
        orrmi   r0, r0, #0x80000000     @ set N
        teqp    r0, r1, lsl #28
        movmi   r0, %1
        movpl   r0, #0
        blmi    " SYMBOL_NAME_STR(__down_interruptible) "
        mov     %0, r0"
                : "=r" (result)
                : "r" (sem)
                : "r0", "r1", "r2", "r3", "ip", "lr", "cc");
        return result;
}
 
/*
 * Note! This is subtle. We jump to wake people up only if
 * the semaphore was negative (== somebody was waiting on it).
 * The default case (no contention) will result in NO
 * jumps for both down() and up().
 */
extern inline void up(struct semaphore * sem)
{
        __asm__ __volatile__ ("
        @ atomic up operation
        mov     r0, pc
        orr     r1, r0, #0x08000000
        and     r0, r0, #0x0c000003
        teqp    r1, #0
        ldr     r1, [%0]
        adds    r1, r1, #1
        str     r1, [%0]
        mov     r1, pc, lsr #28
        orrls   r0, r0, #0x80000000     @ set N
        teqp    r0, r1, lsl #28
        movmi   r0, %0
        blmi    " SYMBOL_NAME_STR(__up)
                : : "r" (sem) : "r0", "r1", "r2", "r3", "ip", "lr", "cc");
}
 
#endif

Line No.	Rev	Author	Line
1	1633	jcastillo	`/*`
2			`* linux/include/asm-arm/proc-armo/semaphore.h`
3			`*/`
4			`#ifndef __ASM_PROC_SEMAPHORE_H`
5			`#define __ASM_PROC_SEMAPHORE_H`
6
7			`/*`
8			`* This is ugly, but we want the default case to fall through.`
9			`* "__down" is the actual routine that waits...`
10			`*/`
11			`extern inline void down(struct semaphore * sem)`
12			`{`
13			`__asm__ __volatile__ ("`
14			`@ atomic down operation`
15			`mov r0, pc`
16			`orr r1, r0, #0x08000000`
17			`and r0, r0, #0x0c000003`
18			`teqp r1, #0`
19			`ldr r1, [%0]`
20			`subs r1, r1, #1`
21			`str r1, [%0]`
22			`mov r1, pc, lsr #28`
23			`teqp r0, r1, lsl #28`
24			`movmi r0, %0`
25			`blmi " SYMBOL_NAME_STR(__down)`
26			`: : "r" (sem) : "r0", "r1", "r2", "r3", "ip", "lr", "cc");`
27			`}`
28
29			`/*`
30			`* This is ugly, but we want the default case to fall through.`
31			`* "__down_interruptible" is the actual routine that waits...`
32			`*/`
33			`extern inline int down_interruptible (struct semaphore * sem)`
34			`{`
35			`int result;`
36			`__asm__ __volatile__ ("`
37			`@ atomic down operation`
38			`mov r0, pc`
39			`orr r1, r0, #0x08000000`
40			`and r0, r0, #0x0c000003`
41			`teqp r1, #0`
42			`ldr r1, [%1]`
43			`subs r1, r1, #1`
44			`str r1, [%1]`
45			`mov r1, pc, lsr #28`
46			`orrmi r0, r0, #0x80000000 @ set N`
47			`teqp r0, r1, lsl #28`
48			`movmi r0, %1`
49			`movpl r0, #0`
50			`blmi " SYMBOL_NAME_STR(__down_interruptible) "`
51			`mov %0, r0"`
52			`: "=r" (result)`
53			`: "r" (sem)`
54			`: "r0", "r1", "r2", "r3", "ip", "lr", "cc");`
55			`return result;`
56			`}`
57
58			`/*`
59			`* Note! This is subtle. We jump to wake people up only if`
60			`* the semaphore was negative (== somebody was waiting on it).`
61			`* The default case (no contention) will result in NO`
62			`* jumps for both down() and up().`
63			`*/`
64			`extern inline void up(struct semaphore * sem)`
65			`{`
66			`__asm__ __volatile__ ("`
67			`@ atomic up operation`
68			`mov r0, pc`
69			`orr r1, r0, #0x08000000`
70			`and r0, r0, #0x0c000003`
71			`teqp r1, #0`
72			`ldr r1, [%0]`
73			`adds r1, r1, #1`
74			`str r1, [%0]`
75			`mov r1, pc, lsr #28`
76			`orrls r0, r0, #0x80000000 @ set N`
77			`teqp r0, r1, lsl #28`
78			`movmi r0, %0`
79			`blmi " SYMBOL_NAME_STR(__up)`
80			`: : "r" (sem) : "r0", "r1", "r2", "r3", "ip", "lr", "cc");`
81			`}`
82
83			`#endif`

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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-armnommu/] [proc-armo/] [semaphore.h] - Blame information for rev 1765