Annotation of prex-old/sys/arch/i386/include/cpu.h, Revision 1.1.1.1.2.1
1.1 nbrk 1: /*
2: * Copyright (c) 2005, Kohsuke Ohtani
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: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #ifndef _I386_CPU_H
31: #define _I386_CPU_H
32:
33: #include <sys/cdefs.h> /* for __packed */
34:
35: /*
36: * GDTs
37: */
38: #define KERNEL_CS 0x10
39: #define KERNEL_DS 0x18
40: #define USER_CS 0x20
41: #define USER_DS 0x28
42: #define KERNEL_TSS 0x38
43:
44: #define NGDTS 8
45:
46: /*
47: * IDTs
48: */
49: #define NIDTS 0x41
50: #define SYSCALL_INT 0x40
51: #define INVALID_INT 0xFF
52:
53:
54: #ifndef __ASSEMBLY__
55:
56: /*
57: * Segment Descriptor
58: */
59: struct seg_desc {
1.1.1.1.2.1! nbrk 60: u_int limit_lo:16; /* segment limit (lsb) */
! 61: u_int base_lo:16; /* segment base address (lsb) */
! 62: u_int base_mid:8; /* segment base address (middle) */
! 63: u_int type:8; /* type */
! 64: u_int limit_hi:4; /* segment limit (msb) */
! 65: u_int size:4; /* size */
! 66: u_int base_hi:8; /* segment base address (msb) */
1.1 nbrk 67: } __packed;
68:
69: /*
70: * Gate Descriptor
71: */
72: struct gate_desc {
1.1.1.1.2.1! nbrk 73: u_int offset_lo:16; /* gate offset (lsb) */
! 74: u_int selector:16; /* gate segment selector */
! 75: u_int nr_copy:8; /* stack copy count */
! 76: u_int type:8; /* type */
! 77: u_int offset_hi:16; /* gate offset (msb) */
1.1 nbrk 78: } __packed;
79:
80: /*
81: * Linear memory description for lgdt and lidt instructions.
82: */
83: struct desc_p {
1.1.1.1.2.1! nbrk 84: uint16_t limit;
! 85: uint32_t base;
1.1 nbrk 86: } __packed;
87:
88: /*
89: * Segment size
90: */
91: #define SIZE_32 0x4 /* 32-bit segment */
92: #define SIZE_16 0x0 /* 16-bit segment */
93: #define SIZE_4K 0x8 /* 4K limit field */
94:
95: /*
96: * Segment type
97: */
98: #define ST_ACC 0x01 /* accessed */
99: #define ST_LDT 0x02 /* LDT */
100: #define ST_CALL_GATE_16 0x04 /* 16-bit call gate */
101: #define ST_TASK_GATE 0x05 /* task gate */
102: #define ST_TSS 0x09 /* task segment */
103: #define ST_CALL_GATE 0x0c /* call gate */
104: #define ST_INTR_GATE 0x0e /* interrupt gate */
105: #define ST_TRAP_GATE 0x0f /* trap gate */
106:
107: #define ST_TSS_BUSY 0x02 /* task busy */
108:
109: #define ST_DATA 0x10 /* data */
110: #define ST_DATA_W 0x12 /* data, writable */
111: #define ST_DATA_E 0x14 /* data, expand-down */
112: #define ST_DATA_EW 0x16 /* data, expand-down, writable */
113:
114: #define ST_CODE 0x18 /* code */
115: #define ST_CODE_R 0x1a /* code, readable */
116: #define ST_CODE_C 0x1c /* code, conforming */
117: #define ST_CODE_CR 0x1e /* code, conforming, readable */
118:
119: #define ST_KERN 0x00 /* kernel access only */
120: #define ST_USER 0x60 /* user access */
121:
122: #define ST_PRESENT 0x80 /* segment present */
123:
124: /*
125: * Task State Segment (TSS)
126: */
127:
128: #define IO_BITMAP_SIZE (65536/8 + 1)
129: #define INVALID_IO_BITMAP 0x8000
130:
131: struct tss {
1.1.1.1.2.1! nbrk 132: uint32_t back_link;
! 133: uint32_t esp0, ss0;
! 134: uint32_t esp1, ss1;
! 135: uint32_t esp2, ss2;
! 136: uint32_t cr3;
! 137: uint32_t eip;
! 138: uint32_t eflags;
! 139: uint32_t eax, ecx, edx, ebx;
! 140: uint32_t esp, ebp, esi, edi;
! 141: uint32_t es, cs, ss, ds, fs, gs;
! 142: uint32_t ldt;
! 143: uint16_t dbg_trace;
! 144: uint16_t io_bitmap_offset;
1.1 nbrk 145: #if 0
1.1.1.1.2.1! nbrk 146: uint32_t io_bitmap[IO_BITMAP_SIZE/4+1];
! 147: uint32_t pad[5];
1.1 nbrk 148: #endif
149: } __packed;
150:
151: /*
152: * i386 flags register
153: */
154: #define EFL_CF 0x00000001 /* Carry */
155: #define EFL_PF 0x00000004 /* Parity */
156: #define EFL_AF 0x00000010 /* Carry */
157: #define EFL_ZF 0x00000040 /* Zero */
158: #define EFL_SF 0x00000080 /* Sign */
159: #define EFL_TF 0x00000100 /* Trap */
160: #define EFL_IF 0x00000200 /* Interrupt enable */
161: #define EFL_DF 0x00000400 /* Direction */
162: #define EFL_OF 0x00000800 /* Overflow */
163: #define EFL_IOPL 0x00003000 /* IO privilege level: */
164: #define EFL_IOPL_KERN 0x00000000 /* Kernel */
165: #define EFL_IOPL_USER 0x00003000 /* User */
166: #define EFL_NT 0x00004000 /* Nested task */
167: #define EFL_RF 0x00010000 /* Resume without tracing */
168: #define EFL_VM 0x00020000 /* Virtual 8086 mode */
169: #define EFL_AC 0x00040000 /* Alignment Check */
170:
171: /*
172: * CR0 register
173: */
174: #define CR0_PG 0x80000000 /* enable paging */
175: #define CR0_CD 0x40000000 /* cache disable */
176: #define CR0_NW 0x20000000 /* no write-through */
177: #define CR0_AM 0x00040000 /* alignment check mask */
178: #define CR0_WP 0x00010000 /* write-protect kernel access */
179: #define CR0_NE 0x00000020 /* handle numeric exceptions */
180: #define CR0_ET 0x00000010 /* extension type is 80387 coprocessor */
181: #define CR0_TS 0x00000008 /* task switch */
182: #define CR0_EM 0x00000004 /* emulate coprocessor */
183: #define CR0_MP 0x00000002 /* monitor coprocessor */
184: #define CR0_PE 0x00000001 /* enable protected mode */
185:
186: /*
187: * Page table (PTE)
188: */
1.1.1.1.2.1! nbrk 189: typedef uint32_t *page_table_t;
1.1 nbrk 190:
191: /*
192: * Page directory entry
193: */
194: #define PDE_PRESENT 0x00000001
195: #define PDE_WRITE 0x00000002
196: #define PDE_USER 0x00000004
197: #define PDE_WTHRU 0x00000008
198: #define PDE_NCACHE 0x00000010
199: #define PDE_ACCESS 0x00000020
200: #define PDE_SIZE 0x00000080
201: #define PDE_AVAIL 0x00000e00
202: #define PDE_ADDRESS 0xfffff000
203:
204: /*
205: * Page table entry
206: */
207: #define PTE_PRESENT 0x00000001
208: #define PTE_WRITE 0x00000002
209: #define PTE_USER 0x00000004
210: #define PTE_WTHRU 0x00000008
211: #define PTE_NCACHE 0x00000010
212: #define PTE_ACCESS 0x00000020
213: #define PTE_DIRTY 0x00000040
214: #define PTE_AVAIL 0x00000e00
215: #define PTE_ADDRESS 0xfffff000
216:
217: /*
218: * Virtual and physical address translation
219: */
1.1.1.1.2.1! nbrk 220: #define PAGE_DIR(virt) (int)((((vaddr_t)(virt)) >> 22) & 0x3ff)
! 221: #define PAGE_TABLE(virt) (int)((((vaddr_t)(virt)) >> 12) & 0x3ff)
1.1 nbrk 222:
223: #define pte_present(pgd, virt) (pgd[PAGE_DIR(virt)] & PDE_PRESENT)
224:
225: #define page_present(pte, virt) (pte[PAGE_TABLE(virt)] & PTE_PRESENT)
226:
227: #define pgd_to_pte(pgd, virt) \
228: (page_table_t)phys_to_virt((pgd)[PAGE_DIR(virt)] & PDE_ADDRESS)
229:
230: #define pte_to_page(pte, virt) \
231: ((pte)[PAGE_TABLE(virt)] & PTE_ADDRESS)
232:
1.1.1.1.2.1! nbrk 233: extern void tss_set(uint32_t kstack);
! 234: extern uint32_t tss_get(void);
! 235: extern void trap_set(int vector, void (*handler)(void));
! 236: extern void trap_handler(struct cpu_regs *);
! 237: extern void cpu_init(void);
1.1 nbrk 238:
239: #endif /* !__ASSEMBLY__ */
240:
241: #endif /* !_I386_CPU_H */
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