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