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2128 | jermar | 1 | /* |
2159 | kebrt | 2 | * Copyright (c) 2007 Michal Kebrt |
2128 | jermar | 3 | * All rights reserved. |
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 | /** @addtogroup arm32 |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | |||
36 | #include <arch.h> |
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2159 | kebrt | 37 | #include <arch/boot.h> |
38 | #include <config.h> |
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2173 | kebrt | 39 | #include <arch/console.h> |
40 | #include <ddi/device.h> |
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2263 | kebrt | 41 | #include <genarch/fb/fb.h> |
42 | #include <genarch/fb/visuals.h> |
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43 | #include <ddi/irq.h> |
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2235 | stepan | 44 | |
2264 | kebrt | 45 | #include <arch/debug_print/print.h> |
2200 | jancik | 46 | #include <print.h> |
47 | #include <config.h> |
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2245 | stepan | 48 | #include <interrupt.h> |
2280 | jancik | 49 | #include <arch/regutils.h> |
2294 | kebrt | 50 | #include <arch/machine.h> |
2280 | jancik | 51 | #include <userspace.h> |
2289 | stepan | 52 | |
2159 | kebrt | 53 | bootinfo_t bootinfo; |
2289 | stepan | 54 | // // uintptr_t supervisor_sp /*__attribute__ ((section (".text")))*/; |
55 | extern uintptr_t supervisor_sp; |
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2159 | kebrt | 56 | |
2128 | jermar | 57 | void arch_pre_main(void) |
58 | { |
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2159 | kebrt | 59 | int i; |
60 | |||
61 | init.cnt = bootinfo.cnt; |
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62 | |||
63 | for (i = 0; i < bootinfo.cnt; ++i) { |
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64 | init.tasks[i].addr = bootinfo.tasks[i].addr; |
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65 | init.tasks[i].size = bootinfo.tasks[i].size; |
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66 | } |
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2300 | kebrt | 67 | |
2128 | jermar | 68 | } |
69 | |||
70 | void arch_pre_mm_init(void) |
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71 | { |
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2245 | stepan | 72 | /* It is not assumed by default */ |
73 | interrupts_disable(); |
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2284 | stepan | 74 | |
75 | setup_exception_stacks(); |
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2294 | kebrt | 76 | |
2128 | jermar | 77 | } |
78 | |||
2280 | jancik | 79 | void prefetch_exception_generator(void); |
80 | |||
2128 | jermar | 81 | void arch_post_mm_init(void) |
82 | { |
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2294 | kebrt | 83 | machine_hw_map_init(); |
2284 | stepan | 84 | |
85 | /* Initialize dispatch table */ |
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2270 | jancik | 86 | exception_init(); |
87 | |||
2263 | kebrt | 88 | interrupt_init(); |
2235 | stepan | 89 | |
2284 | stepan | 90 | console_init(device_assign_devno()); |
2290 | kebrt | 91 | |
2263 | kebrt | 92 | //fb_init(0x12000000, 640, 480, 1920, VISUAL_RGB_8_8_8); |
93 | |||
2284 | stepan | 94 | interrupts_enable(); |
2304 | kebrt | 95 | |
2128 | jermar | 96 | } |
97 | |||
98 | void arch_post_cpu_init(void) |
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99 | { |
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100 | /* TODO */ |
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101 | } |
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102 | |||
103 | void arch_pre_smp_init(void) |
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104 | { |
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105 | /* TODO */ |
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106 | } |
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107 | |||
108 | void arch_post_smp_init(void) |
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109 | { |
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110 | /* TODO */ |
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111 | } |
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112 | |||
113 | /** Perform arm32 specific tasks needed before the new task is run. */ |
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114 | void before_task_runs_arch(void) |
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115 | { |
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116 | /* TODO */ |
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117 | } |
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118 | |||
119 | /** Perform arm32 specific tasks needed before the new thread is scheduled. */ |
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120 | void before_thread_runs_arch(void) |
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121 | { |
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2298 | stepan | 122 | supervisor_sp = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
2128 | jermar | 123 | } |
124 | |||
125 | void after_thread_ran_arch(void) |
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126 | { |
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127 | /* TODO */ |
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128 | } |
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129 | |||
2280 | jancik | 130 | /** Struct to hold general purpose register values */ |
131 | typedef struct { |
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132 | uint32_t r0; |
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133 | uint32_t r1; |
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134 | uint32_t r2; |
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135 | uint32_t r3; |
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136 | uint32_t r4; |
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137 | uint32_t r5; |
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138 | uint32_t r6; |
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139 | uint32_t r7; |
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140 | uint32_t r8; |
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141 | uint32_t r9; |
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142 | uint32_t r10; |
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143 | uint32_t r11; |
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144 | uint32_t r12; |
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145 | uint32_t sp; |
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146 | uint32_t lr; |
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147 | uint32_t pc; |
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148 | } ustate_t; |
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149 | |||
150 | |||
151 | void prefetch_exception_generator(void) { |
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152 | asm __volatile__ ( |
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153 | "ldr pc, =0x7000000" |
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154 | ); |
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155 | |||
156 | } |
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157 | |||
2304 | kebrt | 158 | /** Changes processor mode and jumps to the address specified in the first parameter. |
159 | * |
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160 | * \param kernel_uarg userspace settings (entry point, stack, ...) |
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2280 | jancik | 161 | */ |
162 | void userspace(uspace_arg_t *kernel_uarg) |
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163 | { |
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2304 | kebrt | 164 | dprintf("Userspace: .uspace_uarg(%X), .uspace_entry(%X), .uspace_stack(%X)\n", |
165 | (unsigned int)(kernel_uarg->uspace_uarg), kernel_uarg->uspace_entry, |
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166 | kernel_uarg->uspace_stack); |
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2298 | stepan | 167 | |
2304 | kebrt | 168 | volatile ustate_t ustate; |
2298 | stepan | 169 | |
2304 | kebrt | 170 | // set first parameter |
2280 | jancik | 171 | ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg; |
2298 | stepan | 172 | |
2304 | kebrt | 173 | // clear other registers |
2280 | jancik | 174 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = |
2304 | kebrt | 175 | ustate.r5 = ustate.r6 = ustate.r7 = ustate.r8 = |
176 | ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = 1; |
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2298 | stepan | 177 | |
2304 | kebrt | 178 | ustate.lr = 3; |
179 | |||
2298 | stepan | 180 | //set user stack |
2304 | kebrt | 181 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
2298 | stepan | 182 | |
2304 | kebrt | 183 | //set where uspace execution starts |
184 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
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2280 | jancik | 185 | |
2298 | stepan | 186 | //status register in user mode |
2280 | jancik | 187 | ipl_t cpsr = current_status_reg_read(); |
2304 | kebrt | 188 | cpsr &= ~STATUS_REG_MODE_MASK | USER_MODE; |
2298 | stepan | 189 | |
190 | ipl_t tmpsr = (cpsr & ~STATUS_REG_MODE_MASK) | SUPERVISOR_MODE; |
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2280 | jancik | 191 | |
192 | asm __volatile__ ( |
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2298 | stepan | 193 | // save pointer into ustate struct |
194 | "mov r0, %0 \n" |
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195 | // save cspr |
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196 | "mov r1, %1 \n" |
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197 | // change mode into any exception mode |
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198 | "msr cpsr_c, %2 \n" |
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199 | // set saved cpsr |
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200 | "msr spsr_c, r1 \n" |
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201 | |||
202 | "mov sp, r0 \n" |
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203 | // replace almost all registers |
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204 | "ldmfd sp!, {r0-r12, sp, lr}^\n" |
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205 | //jump to the usermode |
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206 | "ldmfd sp!, {pc}^" |
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2280 | jancik | 207 | : // no output |
208 | : "r"(&ustate), "r"(cpsr), "r"(tmpsr) // |
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209 | : "r0","r1" |
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210 | ); |
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2298 | stepan | 211 | |
212 | while(1) ; |
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2280 | jancik | 213 | } |
2300 | kebrt | 214 | |
215 | |||
216 | void cpu_halt(void) |
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217 | { |
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218 | machine_cpu_halt(); |
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219 | } |
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220 | |||
2128 | jermar | 221 | /** @} |
222 | */ |
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2280 | jancik | 223 | |
224 | |||
225 | |||
226 | |||
227 | |||
228 | |||
229 | |||
230 | |||
231 | |||
232 | |||
233 | |||
234 | |||
235 | |||
236 |