| 1 | /*
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| 2 | * Copyright (C) 2005 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __ppc_ASM_H__
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| 30 | #define __ppc_ASM_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <config.h>
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| 34 |
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| 35 | /** Set priority level low
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| 36 | *
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| 37 | * Enable interrupts and return previous
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| 38 | * value of EE.
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| 39 | */
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| 40 | static inline pri_t cpu_priority_low(void) {
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| 41 | pri_t v;
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| 42 | __asm__ volatile (
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| 43 | "mfmsr %0\n"
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| 44 | "mfmsr %%r31\n"
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| 45 | "ori %%r31, %%r31, 1 << 15\n"
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| 46 | "mtmsr %%r31\n"
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| 47 | : "=r" (v)
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| 48 | :
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| 49 | : "%r31"
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| 50 | );
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| 51 | return v;
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| 52 | }
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| 53 |
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| 54 | /** Set priority level high
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| 55 | *
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| 56 | * Disable interrupts and return previous
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| 57 | * value of EE.
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| 58 | */
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| 59 | static inline pri_t cpu_priority_high(void) {
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| 60 | pri_t v;
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| 61 | __asm__ volatile (
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| 62 | "mfmsr %0\n"
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| 63 | "mfmsr %%r31\n"
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| 64 | "rlwinm %%r31, %%r31, 0, 17, 15\n"
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| 65 | "mtmsr %%r31\n"
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| 66 | : "=r" (v)
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| 67 | :
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| 68 | : "%r31"
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| 69 | );
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| 70 | return v;
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| 71 | }
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| 72 |
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| 73 | /** Restore priority level
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| 74 | *
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| 75 | * Restore EE.
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| 76 | */
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| 77 | static inline void cpu_priority_restore(pri_t pri) {
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| 78 | __asm__ volatile (
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| 79 | "mfmsr %%r31\n"
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| 80 | "rlwimi %0, %%r31, 0, 17, 15\n"
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| 81 | "mtmsr %0\n"
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| 82 | : "=r" (pri)
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| 83 | : "0" (pri)
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| 84 | : "%r31"
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| 85 | );
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| 86 | }
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| 87 |
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| 88 | /* TODO: implement the real stuff */
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| 89 | static inline __address get_stack_base(void)
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| 90 | {
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| 91 | return NULL;
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| 92 | }
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| 93 |
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| 94 | void cpu_sleep(void);
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| 95 | void asm_delay_loop(__u32 t);
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| 96 |
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| 97 | #endif
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