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1 | jermar | 1 | /* |
319 | jermar | 2 | * Copyright (C) 2003-2004 Jakub Jermar |
1 | 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 | #include <arch.h> |
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30 | #include <arch/cp0.h> |
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31 | #include <arch/exception.h> |
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313 | palkovsky | 32 | #include <arch/asm/regname.h> |
33 | #include <arch/asm.h> |
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34 | #include <mm/vm.h> |
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35 | #include <userspace.h> |
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324 | palkovsky | 36 | #include <arch/console.h> |
326 | palkovsky | 37 | #include <memstr.h> |
1 | jermar | 38 | |
326 | palkovsky | 39 | /* Size of the code jumping to the exception handler code |
40 | * - J+NOP |
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41 | */ |
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42 | #define EXCEPTION_JUMP_SIZE 8 |
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43 | |||
44 | #define TLB_EXC ((char *) 0x80000000) |
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45 | #define NORM_EXC ((char *) 0x80000180) |
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46 | #define CACHE_EXC ((char *) 0x80000100) |
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47 | |||
48 | #include <arch/debug.h> |
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49 | |||
26 | jermar | 50 | void arch_pre_mm_init(void) |
1 | jermar | 51 | { |
326 | palkovsky | 52 | /* Copy the exception vectors to the right places */ |
53 | memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE); |
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54 | memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE); |
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55 | memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE); |
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56 | |||
57 | |||
1 | jermar | 58 | /* |
59 | * Switch to BEV normal level so that exception vectors point to the kernel. |
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60 | * Clear the error level. |
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61 | */ |
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62 | cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit)); |
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125 | jermar | 63 | |
1 | jermar | 64 | /* |
65 | * Unmask hardware clock interrupt. |
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66 | */ |
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67 | cp0_status_write(cp0_status_read() | (1<<cp0_status_im7_shift)); |
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125 | jermar | 68 | |
1 | jermar | 69 | /* |
70 | * Start hardware clock. |
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71 | */ |
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324 | palkovsky | 72 | cp0_compare_write(cp0_compare_value + cp0_count_read()); |
73 | |||
74 | console_init(); |
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1 | jermar | 75 | } |
23 | jermar | 76 | |
77 | void arch_post_mm_init(void) |
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78 | { |
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79 | } |
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32 | jermar | 80 | |
81 | void arch_late_init(void) |
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82 | { |
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83 | } |
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313 | palkovsky | 84 | |
85 | void userspace(void) |
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86 | { |
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87 | /* EXL=1, UM=1, IE=1 */ |
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88 | cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit | |
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89 | cp0_status_um_bit | |
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90 | cp0_status_ie_enabled_bit)); |
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91 | |||
92 | cp0_epc_write(UTEXT_ADDRESS); |
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93 | userspace_asm(USTACK_ADDRESS+PAGE_SIZE); |
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94 | while (1) |
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95 | ; |
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96 | } |
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97 | |||
98 | /* Stack pointer saved when entering user mode */ |
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99 | /* TODO: How do we do it on SMP system???? */ |
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100 | __address supervisor_sp; |
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101 | |||
102 | void before_thread_runs_arch(void) |
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103 | { |
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104 | supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
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105 | } |
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106 | |||
107 |