[1] | 1 | /* |
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| 2 | * __kentry.S - unified kernel entry point |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | #define DECLARE_EXCEPT_ERR(n) \ |
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| 24 | .align 16 ; \ |
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| 25 | cli ; \ |
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| 26 | pushl $##n ; \ |
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| 27 | jmp unified_except_entry ; \ |
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| 28 | movl %eax, %eax |
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| 29 | |
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| 30 | #define DECLARE_EXCEPT(n) \ |
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| 31 | .align 16 ; \ |
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| 32 | cli ; \ |
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| 33 | pushl $0x0 ; \ |
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| 34 | pushl $##n ; \ |
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| 35 | jmp unified_except_entry |
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| 36 | |
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| 37 | #define DECLARE_IRQ(n) \ |
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| 38 | .align 16 ; \ |
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| 39 | cli ; \ |
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| 40 | pushl $0x0 ; \ |
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| 41 | pushl $##n ; \ |
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| 42 | jmp unified_irq_entry |
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| 43 | |
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| 44 | .text |
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| 45 | .global __except |
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| 46 | .align 16 |
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| 47 | __except: |
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| 48 | DECLARE_EXCEPT(0) /* Division By Zero Exception */ |
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| 49 | DECLARE_EXCEPT(1) /* Debug Exception */ |
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| 50 | DECLARE_EXCEPT(2) /* Non Maskable Interrupt Exception */ |
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| 51 | DECLARE_EXCEPT(3) /* Breakpoint Exception */ |
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| 52 | DECLARE_EXCEPT(4) /* Into Detected Overflow Exception */ |
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| 53 | DECLARE_EXCEPT(5) /* Out of Bounds Exception */ |
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| 54 | DECLARE_EXCEPT(6) /* Invalid Opcode Exception */ |
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| 55 | DECLARE_EXCEPT(7) /* No Coprocessor Exception */ |
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| 56 | DECLARE_EXCEPT_ERR(8) /* Double Fault Exception */ |
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| 57 | DECLARE_EXCEPT(9) /* Coprocessor Segment Overrun Exception */ |
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| 58 | DECLARE_EXCEPT_ERR(10) /* Bad TSS Exception */ |
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| 59 | DECLARE_EXCEPT_ERR(11) /* Segment Not Present Exception */ |
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| 60 | DECLARE_EXCEPT_ERR(12) /* Stack Fault Exception */ |
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| 61 | DECLARE_EXCEPT_ERR(13) /* General Protection Fault Exception */ |
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| 62 | DECLARE_EXCEPT_ERR(14) /* Page Fault Exception */ |
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| 63 | DECLARE_EXCEPT(15) /* Unknown Interrupt Exception */ |
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| 64 | DECLARE_EXCEPT(16) /* Coprocessor Fault Exception */ |
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| 65 | DECLARE_EXCEPT(17) /* Alignment Check Exception (486+) */ |
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| 66 | DECLARE_EXCEPT(18) /* Machine Check Exception (Pentium/586+) */ |
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| 67 | DECLARE_EXCEPT(19) /* Reserved */ |
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| 68 | DECLARE_EXCEPT(20) /* Reserved */ |
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| 69 | DECLARE_EXCEPT(21) /* Reserved */ |
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| 70 | DECLARE_EXCEPT(22) /* Reserved */ |
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| 71 | DECLARE_EXCEPT(23) /* Reserved */ |
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| 72 | DECLARE_EXCEPT(24) /* Reserved */ |
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| 73 | DECLARE_EXCEPT(25) /* Reserved */ |
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| 74 | DECLARE_EXCEPT(26) /* Reserved */ |
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| 75 | DECLARE_EXCEPT(27) /* Reserved */ |
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| 76 | DECLARE_EXCEPT(28) /* Reserved */ |
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| 77 | DECLARE_EXCEPT(29) /* Reserved */ |
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| 78 | DECLARE_EXCEPT(30) /* Reserved */ |
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| 79 | DECLARE_EXCEPT(31) /* Reserved */ |
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| 80 | |
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| 81 | .text |
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| 82 | .global __irq |
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| 83 | .align 16 |
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| 84 | __irq: |
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| 85 | DECLARE_IRQ(0) |
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| 86 | DECLARE_IRQ(1) |
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| 87 | DECLARE_IRQ(2) |
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| 88 | DECLARE_IRQ(3) |
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| 89 | DECLARE_IRQ(4) |
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| 90 | DECLARE_IRQ(5) |
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| 91 | DECLARE_IRQ(6) |
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| 92 | DECLARE_IRQ(7) |
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| 93 | DECLARE_IRQ(8) |
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| 94 | DECLARE_IRQ(9) |
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| 95 | DECLARE_IRQ(10) |
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| 96 | DECLARE_IRQ(11) |
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| 97 | DECLARE_IRQ(12) |
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| 98 | DECLARE_IRQ(13) |
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| 99 | DECLARE_IRQ(14) |
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| 100 | DECLARE_IRQ(15) |
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| 101 | DECLARE_IRQ(16) |
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| 102 | DECLARE_IRQ(17) |
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| 103 | DECLARE_IRQ(18) |
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| 104 | DECLARE_IRQ(19) |
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| 105 | DECLARE_IRQ(20) |
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| 106 | DECLARE_IRQ(21) |
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| 107 | DECLARE_IRQ(22) |
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| 108 | DECLARE_IRQ(23) |
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| 109 | DECLARE_IRQ(24) |
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| 110 | DECLARE_IRQ(25) |
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| 111 | DECLARE_IRQ(26) |
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| 112 | DECLARE_IRQ(27) |
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| 113 | DECLARE_IRQ(28) |
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| 114 | DECLARE_IRQ(29) |
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| 115 | DECLARE_IRQ(30) |
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| 116 | DECLARE_IRQ(31) |
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| 117 | DECLARE_IRQ(32) |
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| 118 | DECLARE_IRQ(33) |
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| 119 | DECLARE_IRQ(34) |
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| 120 | DECLARE_IRQ(35) |
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| 121 | DECLARE_IRQ(36) |
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| 122 | DECLARE_IRQ(37) |
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| 123 | DECLARE_IRQ(38) |
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| 124 | DECLARE_IRQ(39) |
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| 125 | DECLARE_IRQ(40) |
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| 126 | DECLARE_IRQ(41) |
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| 127 | DECLARE_IRQ(42) |
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| 128 | DECLARE_IRQ(43) |
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| 129 | DECLARE_IRQ(44) |
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| 130 | DECLARE_IRQ(45) |
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| 131 | DECLARE_IRQ(46) |
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| 132 | DECLARE_IRQ(47) |
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| 133 | DECLARE_IRQ(48) |
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| 134 | DECLARE_IRQ(49) |
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| 135 | DECLARE_IRQ(50) |
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| 136 | DECLARE_IRQ(51) |
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| 137 | DECLARE_IRQ(52) |
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| 138 | DECLARE_IRQ(53) |
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| 139 | DECLARE_IRQ(54) |
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| 140 | DECLARE_IRQ(55) |
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| 141 | DECLARE_IRQ(56) |
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| 142 | DECLARE_IRQ(57) |
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| 143 | DECLARE_IRQ(58) |
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| 144 | DECLARE_IRQ(59) |
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| 145 | DECLARE_IRQ(60) |
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| 146 | DECLARE_IRQ(61) |
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| 147 | DECLARE_IRQ(62) |
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| 148 | DECLARE_IRQ(63) |
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| 149 | DECLARE_IRQ(64) /* End of Available IRQ in this version, this is also the syscall gate (INT 96). |
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| 150 | * this value is used by PIC_IRQ_MAX macor */ |
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| 151 | |
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| 152 | #define SAVE_REGS \ |
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| 153 | pusha ; \ |
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| 154 | push %ds ; \ |
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| 155 | push %es ; \ |
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| 156 | push %fs ; \ |
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| 157 | push %gs ; \ |
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| 158 | |
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| 159 | #define RESTORE_REGS \ |
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| 160 | pop %gs ; \ |
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| 161 | pop %fs ; \ |
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| 162 | pop %es ; \ |
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| 163 | pop %ds ; \ |
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| 164 | popa |
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| 165 | |
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| 166 | #define LOAD_KERNEL_SEGMENT \ |
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| 167 | mov $0x10, %ax ; \ |
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| 168 | mov %ax, %ds ; \ |
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| 169 | mov %ax, %es ; \ |
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| 170 | mov %ax, %fs ; \ |
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| 171 | mov %ax, %gs ; \ |
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| 172 | |
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| 173 | .extern __do_exception |
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| 174 | .extern __do_interrupt |
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| 175 | |
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| 176 | unified_except_entry: |
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| 177 | SAVE_REGS |
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| 178 | LOAD_KERNEL_SEGMENT |
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| 179 | mov %esp, %eax |
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| 180 | push %eax |
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| 181 | call __do_exception |
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| 182 | pop %eax |
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| 183 | RESTORE_REGS |
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| 184 | add $0x8, %esp |
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| 185 | iret |
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| 186 | |
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| 187 | unified_irq_entry: |
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| 188 | SAVE_REGS |
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| 189 | LOAD_KERNEL_SEGMENT |
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| 190 | mov %esp, %eax |
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| 191 | push %eax |
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| 192 | call __do_interrupt |
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| 193 | pop %eax |
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| 194 | RESTORE_REGS |
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| 195 | add $0x8, %esp |
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| 196 | iret |
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| 197 | |
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