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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2003-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <arch.h> |
29 | #include <arch.h> |
30 | #include <arch/cp0.h> |
30 | #include <arch/cp0.h> |
31 | #include <arch/exception.h> |
31 | #include <arch/exception.h> |
32 | #include <arch/asm/regname.h> |
32 | #include <arch/asm/regname.h> |
33 | #include <arch/asm.h> |
33 | #include <arch/asm.h> |
34 | #include <mm/vm.h> |
34 | #include <mm/vm.h> |
35 | #include <userspace.h> |
35 | #include <userspace.h> |
36 | 36 | ||
37 | void arch_pre_mm_init(void) |
37 | void arch_pre_mm_init(void) |
38 | { |
38 | { |
39 | /* |
39 | /* |
40 | * Switch to BEV normal level so that exception vectors point to the kernel. |
40 | * Switch to BEV normal level so that exception vectors point to the kernel. |
41 | * Clear the error level. |
41 | * Clear the error level. |
42 | */ |
42 | */ |
43 | cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit)); |
43 | cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit)); |
44 | 44 | ||
45 | /* |
45 | /* |
46 | * Unmask hardware clock interrupt. |
46 | * Unmask hardware clock interrupt. |
47 | */ |
47 | */ |
48 | cp0_status_write(cp0_status_read() | (1<<cp0_status_im7_shift)); |
48 | cp0_status_write(cp0_status_read() | (1<<cp0_status_im7_shift)); |
49 | 49 | ||
50 | /* |
50 | /* |
51 | * Start hardware clock. |
51 | * Start hardware clock. |
52 | */ |
52 | */ |
53 | cp0_compare_write(cp0_compare_value); |
53 | cp0_compare_write(cp0_compare_value); |
54 | cp0_count_write(0); |
54 | cp0_count_write(0); |
55 | } |
55 | } |
56 | 56 | ||
57 | void arch_post_mm_init(void) |
57 | void arch_post_mm_init(void) |
58 | { |
58 | { |
59 | } |
59 | } |
60 | 60 | ||
61 | void arch_late_init(void) |
61 | void arch_late_init(void) |
62 | { |
62 | { |
63 | } |
63 | } |
64 | 64 | ||
65 | void userspace(void) |
65 | void userspace(void) |
66 | { |
66 | { |
67 | /* EXL=1, UM=1, IE=1 */ |
67 | /* EXL=1, UM=1, IE=1 */ |
68 | cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit | |
68 | cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit | |
69 | cp0_status_um_bit | |
69 | cp0_status_um_bit | |
70 | cp0_status_ie_enabled_bit)); |
70 | cp0_status_ie_enabled_bit)); |
71 | 71 | ||
72 | cp0_epc_write(UTEXT_ADDRESS); |
72 | cp0_epc_write(UTEXT_ADDRESS); |
73 | userspace_asm(USTACK_ADDRESS+PAGE_SIZE); |
73 | userspace_asm(USTACK_ADDRESS+PAGE_SIZE); |
74 | while (1) |
74 | while (1) |
75 | ; |
75 | ; |
76 | } |
76 | } |
77 | 77 | ||
78 | /* Stack pointer saved when entering user mode */ |
78 | /* Stack pointer saved when entering user mode */ |
79 | /* TODO: How do we do it on SMP system???? */ |
79 | /* TODO: How do we do it on SMP system???? */ |
80 | __address supervisor_sp; |
80 | __address supervisor_sp; |
81 | 81 | ||
82 | void before_thread_runs_arch(void) |
82 | void before_thread_runs_arch(void) |
83 | { |
83 | { |
84 | supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
84 | supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
85 | } |
85 | } |
86 | 86 | ||
87 | 87 | ||
88 | 88 |