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| Rev | Author | Line No. | Line |
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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> |
| 329 | palkovsky | 38 | #include <arch/interrupt.h> |
| 1 | jermar | 39 | |
| 330 | palkovsky | 40 | #include <print.h> |
| 41 | |||
| 326 | palkovsky | 42 | /* Size of the code jumping to the exception handler code |
| 43 | * - J+NOP |
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| 44 | */ |
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| 45 | #define EXCEPTION_JUMP_SIZE 8 |
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| 46 | |||
| 47 | #define TLB_EXC ((char *) 0x80000000) |
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| 48 | #define NORM_EXC ((char *) 0x80000180) |
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| 49 | #define CACHE_EXC ((char *) 0x80000100) |
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| 50 | |||
| 26 | jermar | 51 | void arch_pre_mm_init(void) |
| 1 | jermar | 52 | { |
| 329 | palkovsky | 53 | /* It is not assumed by default */ |
| 54 | cpu_priority_high(); |
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| 55 | |||
| 326 | palkovsky | 56 | /* Copy the exception vectors to the right places */ |
| 57 | memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE); |
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| 58 | memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE); |
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| 59 | memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE); |
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| 60 | |||
| 1 | jermar | 61 | /* |
| 62 | * Switch to BEV normal level so that exception vectors point to the kernel. |
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| 63 | * Clear the error level. |
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| 64 | */ |
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| 65 | cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit)); |
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| 125 | jermar | 66 | |
| 329 | palkovsky | 67 | /* |
| 68 | * Mask all interrupts |
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| 69 | */ |
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| 70 | cp0_mask_all_int(); |
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| 1 | jermar | 71 | /* |
| 72 | * Unmask hardware clock interrupt. |
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| 73 | */ |
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| 329 | palkovsky | 74 | cp0_unmask_int(TIMER_INTERRUPT); |
| 125 | jermar | 75 | |
| 1 | jermar | 76 | /* |
| 77 | * Start hardware clock. |
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| 78 | */ |
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| 324 | palkovsky | 79 | cp0_compare_write(cp0_compare_value + cp0_count_read()); |
| 80 | |||
| 81 | console_init(); |
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| 1 | jermar | 82 | } |
| 23 | jermar | 83 | |
| 84 | void arch_post_mm_init(void) |
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| 85 | { |
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| 86 | } |
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| 32 | jermar | 87 | |
| 88 | void arch_late_init(void) |
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| 89 | { |
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| 90 | } |
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| 313 | palkovsky | 91 | |
| 92 | void userspace(void) |
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| 93 | { |
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| 94 | /* EXL=1, UM=1, IE=1 */ |
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| 95 | cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit | |
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| 96 | cp0_status_um_bit | |
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| 97 | cp0_status_ie_enabled_bit)); |
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| 98 | |||
| 99 | cp0_epc_write(UTEXT_ADDRESS); |
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| 100 | userspace_asm(USTACK_ADDRESS+PAGE_SIZE); |
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| 101 | while (1) |
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| 102 | ; |
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| 103 | } |
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| 104 | |||
| 105 | /* Stack pointer saved when entering user mode */ |
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| 106 | /* TODO: How do we do it on SMP system???? */ |
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| 107 | __address supervisor_sp; |
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| 108 | |||
| 109 | void before_thread_runs_arch(void) |
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| 110 | { |
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| 111 | supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
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| 112 | } |
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| 113 | |||
| 114 |