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1160 | decky | 1 | /* |
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 | |||
29 | #ifndef __ppc64_ASM_H__ |
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30 | #define __ppc64_ASM_H__ |
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31 | |||
32 | #include <arch/types.h> |
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33 | #include <config.h> |
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34 | |||
35 | /** Enable interrupts. |
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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 | * @return Old interrupt priority level. |
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41 | */ |
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1398 | decky | 42 | static inline ipl_t interrupts_enable(void) |
43 | { |
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1160 | decky | 44 | ipl_t v; |
45 | ipl_t tmp; |
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46 | |||
1398 | decky | 47 | asm volatile ( |
1160 | decky | 48 | "mfmsr %0\n" |
49 | "mfmsr %1\n" |
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50 | "ori %1, %1, 1 << 15\n" |
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51 | "mtmsr %1\n" |
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52 | : "=r" (v), "=r" (tmp) |
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53 | ); |
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54 | return v; |
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55 | } |
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56 | |||
57 | /** Disable interrupts. |
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58 | * |
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59 | * Disable interrupts and return previous |
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60 | * value of EE. |
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61 | * |
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62 | * @return Old interrupt priority level. |
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63 | */ |
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1398 | decky | 64 | static inline ipl_t interrupts_disable(void) |
65 | { |
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1160 | decky | 66 | ipl_t v; |
67 | ipl_t tmp; |
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68 | |||
1398 | decky | 69 | asm volatile ( |
1160 | decky | 70 | "mfmsr %0\n" |
71 | "mfmsr %1\n" |
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72 | "rlwinm %1, %1, 0, 17, 15\n" |
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73 | "mtmsr %1\n" |
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74 | : "=r" (v), "=r" (tmp) |
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75 | ); |
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76 | return v; |
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77 | } |
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78 | |||
79 | /** Restore interrupt priority level. |
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80 | * |
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81 | * Restore EE. |
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82 | * |
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83 | * @param ipl Saved interrupt priority level. |
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84 | */ |
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1398 | decky | 85 | static inline void interrupts_restore(ipl_t ipl) |
86 | { |
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1160 | decky | 87 | ipl_t tmp; |
88 | |||
1398 | decky | 89 | asm volatile ( |
1160 | decky | 90 | "mfmsr %1\n" |
91 | "rlwimi %0, %1, 0, 17, 15\n" |
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92 | "cmpw 0, %0, %1\n" |
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93 | "beq 0f\n" |
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94 | "mtmsr %0\n" |
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95 | "0:\n" |
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96 | : "=r" (ipl), "=r" (tmp) |
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97 | : "0" (ipl) |
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1398 | decky | 98 | : "cr0" |
1160 | decky | 99 | ); |
100 | } |
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101 | |||
102 | /** Return interrupt priority level. |
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103 | * |
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104 | * Return EE. |
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105 | * |
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106 | * @return Current interrupt priority level. |
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107 | */ |
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1398 | decky | 108 | static inline ipl_t interrupts_read(void) |
109 | { |
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1160 | decky | 110 | ipl_t v; |
1398 | decky | 111 | |
112 | asm volatile ( |
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1160 | decky | 113 | "mfmsr %0\n" |
114 | : "=r" (v) |
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115 | ); |
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116 | return v; |
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117 | } |
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118 | |||
119 | /** Return base address of current stack. |
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120 | * |
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121 | * Return the base address of the current stack. |
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122 | * The stack is assumed to be STACK_SIZE bytes long. |
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123 | * The stack must start on page boundary. |
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124 | */ |
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125 | static inline __address get_stack_base(void) |
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126 | { |
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127 | __address v; |
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128 | |||
1398 | decky | 129 | asm volatile ( |
130 | "and %0, %%sp, %1\n" |
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131 | : "=r" (v) |
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132 | : "r" (~(STACK_SIZE - 1)) |
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133 | ); |
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1160 | decky | 134 | return v; |
135 | } |
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136 | |||
137 | static inline void cpu_sleep(void) |
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138 | { |
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139 | } |
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140 | |||
1399 | decky | 141 | static inline void cpu_halt(void) |
142 | { |
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143 | asm volatile ( |
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144 | "b 0\n" |
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145 | ); |
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146 | } |
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147 | |||
1160 | decky | 148 | void asm_delay_loop(__u32 t); |
149 | |||
1398 | decky | 150 | extern void userspace_asm(__address uspace_uarg, __address stack, __address entry); |
151 | |||
1160 | decky | 152 | #endif |