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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [sparc/] [kernel/] [switch.S] - Blame information for rev 1765

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/* $Id: switch.S,v 1.1.1.1 2001-09-10 07:44:02 simons Exp $
 * switch.S: Sparc task switch code.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
#define sw_ntask     g1
#define sw_psr       g4
#define sw_wim       g5
#define sw_tmp       g6
#define sw_ctx       g7
 
/* Context switch code.  The new process's task_struct
 * ptr is passed as the first parameter.
 *
 * First successful task switch 05/13/95 21:52:37
 */
        .align 4
        .globl  C_LABEL(sparc_switch_to)
C_LABEL(sparc_switch_to):
        mov     %o0, %sw_ntask
 
        /* Save kernel state. */
        FLUSH_ALL_KERNEL_WINDOWS;
        STORE_WINDOW(sp)
        rd      %psr, %sw_psr
        LOAD_CURRENT(sw_tmp, sw_wim)
        rd      %wim, %sw_wim
        std     %sw_psr, [%sw_tmp + THREAD_KPSR]
        std     %sp, [%sw_tmp + THREAD_KSP]
 
        /* Load new kernel state. */
        wr      %sw_psr, PSR_ET, %psr
        WRITE_PAUSE
#ifdef __SMP__
        GET_PROCESSOR_OFFSET(sw_psr)
        set     C_LABEL(current_set), %sw_tmp
        st      %sw_ntask, [%sw_tmp + %sw_psr]
#else
        sethi   %hi(C_LABEL(current_set)), %sw_tmp
        st      %sw_ntask, [%sw_tmp + %lo(C_LABEL(current_set))]
#endif
        ldd     [%sw_ntask + THREAD_KPSR], %sw_psr
        wr      %sw_psr, PSR_ET, %psr
        WRITE_PAUSE
        wr      %sw_wim, 0x0, %wim
        WRITE_PAUSE
        ldd     [%sw_ntask + THREAD_KSP], %sp
        LOAD_WINDOW(sp)
 
        wr      %sw_psr, 0x0, %psr              ! traps back on
        WRITE_PAUSE
 
        retl
         nop
 
 
#ifdef __SMP__
        /* Because of nasty register windows this is the only way
         * to start a processor into its cpu_idle() thread.
         */
 
        .globl  C_LABEL(sparc_cpusched)
C_LABEL(sparc_cpusched):
        LOAD_CURRENT(g1, g2)
        rd      %psr, %g7
 
        wr      %g7, PSR_ET, %psr
        WRITE_PAUSE
 
        ldd     [%g1 + THREAD_KPSR], %g2
 
        wr      %g2, PSR_ET, %psr
        WRITE_PAUSE
 
        wr      %g3, 0x0, %wim
        WRITE_PAUSE
 
        ldd     [%g1 + THREAD_KSP], %sp
        LOAD_WINDOW(sp)
 
        wr      %g2, 0x0, %psr
        WRITE_PAUSE
 
        retl
         nop
#endif

Line No.	Rev	Author	Line
1	199	simons	`/* $Id: switch.S,v 1.1.1.1 2001-09-10 07:44:02 simons Exp $`
2			`* switch.S: Sparc task switch code.`
3			`*`
4			`* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)`
5			`*/`
6
7			`#include`
8			`#include`
9			`#include`
10			`#include`
11			`#include`
12			`#include`
13			`#include`
14			`#include`
15
16			`#define sw_ntask g1`
17			`#define sw_psr g4`
18			`#define sw_wim g5`
19			`#define sw_tmp g6`
20			`#define sw_ctx g7`
21
22			`/* Context switch code. The new process's task_struct`
23			`* ptr is passed as the first parameter.`
24			`*`
25			`* First successful task switch 05/13/95 21:52:37`
26			`*/`
27			`.align 4`
28			`.globl C_LABEL(sparc_switch_to)`
29			`C_LABEL(sparc_switch_to):`
30			`mov %o0, %sw_ntask`
31
32			`/* Save kernel state. */`
33			`FLUSH_ALL_KERNEL_WINDOWS;`
34			`STORE_WINDOW(sp)`
35			`rd %psr, %sw_psr`
36			`LOAD_CURRENT(sw_tmp, sw_wim)`
37			`rd %wim, %sw_wim`
38			`std %sw_psr, [%sw_tmp + THREAD_KPSR]`
39			`std %sp, [%sw_tmp + THREAD_KSP]`
40
41			`/* Load new kernel state. */`
42			`wr %sw_psr, PSR_ET, %psr`
43			`WRITE_PAUSE`
44			`#ifdef __SMP__`
45			`GET_PROCESSOR_OFFSET(sw_psr)`
46			`set C_LABEL(current_set), %sw_tmp`
47			`st %sw_ntask, [%sw_tmp + %sw_psr]`
48			`#else`
49			`sethi %hi(C_LABEL(current_set)), %sw_tmp`
50			`st %sw_ntask, [%sw_tmp + %lo(C_LABEL(current_set))]`
51			`#endif`
52			`ldd [%sw_ntask + THREAD_KPSR], %sw_psr`
53			`wr %sw_psr, PSR_ET, %psr`
54			`WRITE_PAUSE`
55			`wr %sw_wim, 0x0, %wim`
56			`WRITE_PAUSE`
57			`ldd [%sw_ntask + THREAD_KSP], %sp`
58			`LOAD_WINDOW(sp)`
59
60			`wr %sw_psr, 0x0, %psr ! traps back on`
61			`WRITE_PAUSE`
62
63			`retl`
64			`nop`
65
66
67			`#ifdef __SMP__`
68			`/* Because of nasty register windows this is the only way`
69			`* to start a processor into its cpu_idle() thread.`
70			`*/`
71
72			`.globl C_LABEL(sparc_cpusched)`
73			`C_LABEL(sparc_cpusched):`
74			`LOAD_CURRENT(g1, g2)`
75			`rd %psr, %g7`
76
77			`wr %g7, PSR_ET, %psr`
78			`WRITE_PAUSE`
79
80			`ldd [%g1 + THREAD_KPSR], %g2`
81
82			`wr %g2, PSR_ET, %psr`
83			`WRITE_PAUSE`
84
85			`wr %g3, 0x0, %wim`
86			`WRITE_PAUSE`
87
88			`ldd [%g1 + THREAD_KSP], %sp`
89			`LOAD_WINDOW(sp)`
90
91			`wr %g2, 0x0, %psr`
92			`WRITE_PAUSE`
93
94			`retl`
95			`nop`
96			`#endif`

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [sparc/] [kernel/] [switch.S] - Blame information for rev 1765