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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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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 | #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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| 1 | jermar | 36 | |
| 26 | jermar | 37 | void arch_pre_mm_init(void) |
| 1 | jermar | 38 | { |
| 39 | /* |
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| 40 | * Switch to BEV normal level so that exception vectors point to the kernel. |
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| 41 | * Clear the error level. |
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| 42 | */ |
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| 43 | cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit)); |
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| 125 | jermar | 44 | |
| 1 | jermar | 45 | /* |
| 46 | * Unmask hardware clock interrupt. |
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| 47 | */ |
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| 48 | cp0_status_write(cp0_status_read() | (1<<cp0_status_im7_shift)); |
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| 125 | jermar | 49 | |
| 1 | jermar | 50 | /* |
| 51 | * Start hardware clock. |
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| 52 | */ |
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| 53 | cp0_compare_write(cp0_compare_value); |
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| 54 | cp0_count_write(0); |
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| 55 | } |
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| 23 | jermar | 56 | |
| 57 | void arch_post_mm_init(void) |
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| 58 | { |
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| 59 | } |
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| 32 | jermar | 60 | |
| 61 | void arch_late_init(void) |
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| 62 | { |
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| 63 | } |
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| 313 | palkovsky | 64 | |
| 65 | void userspace(void) |
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| 66 | { |
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| 67 | /* EXL=1, UM=1, IE=1 */ |
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| 68 | cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit | |
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| 69 | cp0_status_um_bit | |
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| 70 | cp0_status_ie_enabled_bit)); |
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| 71 | |||
| 72 | cp0_epc_write(UTEXT_ADDRESS); |
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| 73 | userspace_asm(USTACK_ADDRESS+PAGE_SIZE); |
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| 74 | while (1) |
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| 75 | ; |
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| 76 | } |
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| 77 | |||
| 78 | /* Stack pointer saved when entering user mode */ |
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| 79 | /* TODO: How do we do it on SMP system???? */ |
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| 80 | __address supervisor_sp; |
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| 81 | |||
| 82 | void before_thread_runs_arch(void) |
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| 83 | { |
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| 84 | supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
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| 85 | } |
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| 86 | |||
| 87 |