Subversion Repositories HelenOS

Rev

Rev 344 | Rev 413 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
319 jermar 2
 * Copyright (C) 2003-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
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
15
 *   derived from this software without specific prior written permission.
16
 *
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
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#include <arch.h>
30
#include <arch/cp0.h>
31
#include <arch/exception.h>
313 palkovsky 32
#include <arch/asm/regname.h>
33
#include <arch/asm.h>
34
#include <mm/vm.h>
35
#include <userspace.h>
324 palkovsky 36
#include <arch/console.h>
326 palkovsky 37
#include <memstr.h>
329 palkovsky 38
#include <arch/interrupt.h>
332 palkovsky 39
#include <arch/drivers/arc.h>
391 jermar 40
#include <proc/thread.h>
330 palkovsky 41
#include <print.h>
42
 
326 palkovsky 43
/* Size of the code jumping to the exception handler code
44
 * - J+NOP
45
 */
46
#define EXCEPTION_JUMP_SIZE    8
47
 
48
#define TLB_EXC ((char *) 0x80000000)
49
#define NORM_EXC ((char *) 0x80000180)
50
#define CACHE_EXC ((char *) 0x80000100)
51
 
26 jermar 52
void arch_pre_mm_init(void)
1 jermar 53
{
329 palkovsky 54
    /* It is not assumed by default */
55
    cpu_priority_high();
56
 
332 palkovsky 57
    init_arc();
58
 
326 palkovsky 59
    /* Copy the exception vectors to the right places */
60
    memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
61
    memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
62
    memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
63
 
1 jermar 64
    /*
65
     * Switch to BEV normal level so that exception vectors point to the kernel.
66
     * Clear the error level.
67
     */
68
    cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
125 jermar 69
 
329 palkovsky 70
    /*
71
     * Mask all interrupts
72
     */
73
    cp0_mask_all_int();
1 jermar 74
    /*
75
     * Unmask hardware clock interrupt.
76
     */
329 palkovsky 77
    cp0_unmask_int(TIMER_INTERRUPT);
125 jermar 78
 
1 jermar 79
    /*
80
     * Start hardware clock.
81
     */
324 palkovsky 82
    cp0_compare_write(cp0_compare_value + cp0_count_read());
83
 
84
    console_init();
332 palkovsky 85
    arc_print_memory_map();
344 palkovsky 86
    arc_print_devices();
1 jermar 87
}
23 jermar 88
 
89
void arch_post_mm_init(void)
90
{
91
}
32 jermar 92
 
93
void arch_late_init(void)
94
{
95
}
313 palkovsky 96
 
97
void userspace(void)
98
{
99
    /* EXL=1, UM=1, IE=1 */
100
    cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
101
                          cp0_status_um_bit |
102
                          cp0_status_ie_enabled_bit));
103
 
104
    cp0_epc_write(UTEXT_ADDRESS);
105
    userspace_asm(USTACK_ADDRESS+PAGE_SIZE);
106
    while (1)
107
        ;
108
}
109
 
110
/* Stack pointer saved when entering user mode */
111
/* TODO: How do we do it on SMP system???? */
112
__address supervisor_sp;
113
 
114
void before_thread_runs_arch(void)
115
{
116
    supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
117
}