np2/i386c/ia32/segments.h - view

File: [RetroPC.NET] / np2 / i386c / ia32 / segments.h
Revision 1.11: download - view: text, annotated - select for diffs
Sat Mar 22 13:03:08 2008 JST (17 years, 7 months ago) by monaka
Branches: MAIN
CVS tags: HEAD

- more memory range check.
- etc, etc...

/* $Id: segments.h,v 1.11 2008/03/22 04:03:08 monaka Exp $ */ /* * Copyright (c) 2003 NONAKA Kimihiro * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef IA32_CPU_SEGMENTS_H__ #define IA32_CPU_SEGMENTS_H__ #ifdef __cplusplus extern "C" { #endif /* * segment descriptor */ typedef struct { union { struct { UINT32 segbase; UINT32 segend; /* unused */ UINT32 limit; UINT8 c; /* 0 = data, 1 = code */ UINT8 g; /* 4k base */ UINT8 wr; /* readable/writable */ UINT8 ec; /* expand down/conforming */ } seg; struct { UINT16 selector; UINT16 w_pad; UINT32 offset; UINT8 count; /* parameter count:call gate */ UINT8 b_pad[7]; } gate; } u; UINT8 valid; /* descriptor valid flag */ UINT8 p; /* avail flag */ UINT8 type; /* descriptor type */ UINT8 dpl; /* DPL */ UINT8 rpl; /* RPL */ UINT8 s; /* 0 = system, 1 = code/data */ UINT8 d; /* 0 = 16bit, 1 = 32bit */ UINT8 flag; #define CPU_DESC_FLAG_READABLE (1 << 0) #define CPU_DESC_FLAG_WRITABLE (1 << 1) #define CPU_DESC_FLAG_WHOLEADR (1 << 2) } descriptor_t; #define SEG_IS_VALID(sdp) ((sdp)->valid) #define SEG_IS_PRESENT(sdp) ((sdp)->p) #define SEG_IS_32BIT(sdp) ((sdp)->d) #define SEG_IS_SYSTEM(sdp) (!(sdp)->s) #define SEG_IS_CODE(sdp) ((sdp)->s && (sdp)->u.seg.c) #define SEG_IS_DATA(sdp) ((sdp)->s && !(sdp)->u.seg.c) #define SEG_IS_READABLE_CODE(sdp) ((sdp)->u.seg.wr) #define SEG_IS_WRITABLE_DATA(sdp) ((sdp)->u.seg.wr) #define SEG_IS_CONFORMING_CODE(sdp) ((sdp)->u.seg.ec) #define SEG_IS_EXPANDDOWN_DATA(sdp) ((sdp)->u.seg.ec) /* * segment descriptor * * 31 24 23 22 21 20 19 16 15 14 13 12 11 8 7 0 * +----------------+--+--+--+--+-------+--+-----+--+-------+---------------+ * | Base 31..16 | G|DB| 0| A|limit_h| P| DPL | S| type | Base 23:16 | 4 * +----------------+--+--+--+--+-------+--+-----+--+-------+---------------+ * 31 16 15 0 * +------------------------------------+-----------------------------------+ * | Base 15..00 | limit 15..0 | 0 * +------------------------------------+-----------------------------------+ */ /* descriptor common */ #define CPU_DESC_H_TYPE_SHIFT 8 #define CPU_DESC_H_TYPE (0xf << CPU_DESC_H_TYPE_SHIFT) #define CPU_DESC_H_S ( 1 << 12) /* 0 = system, 1 = code/data */ #define CPU_DESC_H_DPL_SHIFT 13 #define CPU_DESC_H_DPL ( 3 << CPU_DESC_H_DPL_SHIFT) #define CPU_DESC_H_P ( 1 << 15) /* exist */ /* for segment descriptor */ #define CPU_SEGDESC_H_A ( 1 << 8) #define CPU_SEGDESC_H_D_C ( 1 << 11) /* 0 = data, 1 = code */ #define CPU_SEGDESC_H_D ( 1 << 22) #define CPU_SEGDESC_H_G ( 1 << 23) /* for gate descriptor */ #define CPU_GATEDESC_H_D ( 1 << 11) /* for tss descriptor */ #define CPU_TSS_H_BUSY ( 1 << 9) /* * descriptor type */ #define CPU_SEGDESC_TYPE_A 0x01 #define CPU_SEGDESC_TYPE_WR 0x02 #define CPU_SEGDESC_TYPE_EC 0x04 #define CPU_SYSDESC_TYPE_TSS_16 0x01 #define CPU_SYSDESC_TYPE_LDT 0x02 #define CPU_SYSDESC_TYPE_TSS_BUSY_16 0x03 #define CPU_SYSDESC_TYPE_CALL_16 0x04 /* call gate */ #define CPU_SYSDESC_TYPE_TASK 0x05 /* task gate */ #define CPU_SYSDESC_TYPE_INTR_16 0x06 /* hardware interrupt */ #define CPU_SYSDESC_TYPE_TRAP_16 0x07 /* software interrupt */ #define CPU_SYSDESC_TYPE_TSS_32 0x09 #define CPU_SYSDESC_TYPE_TSS_BUSY_32 0x0b #define CPU_SYSDESC_TYPE_CALL_32 0x0c /* call gate */ #define CPU_SYSDESC_TYPE_INTR_32 0x0e /* hardware interrupt */ #define CPU_SYSDESC_TYPE_TRAP_32 0x0f /* software interrupt */ #define CPU_SYSDESC_TYPE_TSS 0x01 /* CPU_SYSDESC_TYPE_LDT 0x02 */ #define CPU_SYSDESC_TYPE_TSS_BUSY 0x03 #define CPU_SYSDESC_TYPE_CALL 0x04 /* CPU_SYSDESC_TYPE_TASK 0x05 */ #define CPU_SYSDESC_TYPE_INTR 0x06 #define CPU_SYSDESC_TYPE_TRAP 0x07 #define CPU_SYSDESC_TYPE_MASKBIT 0x07 #define CPU_SYSDESC_TYPE_32BIT 0x08 #define CPU_SYSDESC_TYPE_TSS_BUSY_IND 0x02 static INLINE void segdesc_clear(descriptor_t *sdp) { memset((sdp), 0, sizeof(*sdp)); } void segdesc_init(int idx, UINT16 sreg, descriptor_t *sdp); void segdesc_set_default(int idx, UINT16 selector, descriptor_t *sdp); void load_descriptor(descriptor_t *sdp, UINT32 addr); void load_segreg(int idx, UINT16 selector, UINT16 *sregp, descriptor_t *sdp, int exc); #define LOAD_SEGREG1(idx, selector, e) \ load_segreg(idx, selector, &CPU_REGS_SREG(idx), &CPU_STAT_SREG(idx), e) #define LOAD_SEGREG(idx, selector) \ LOAD_SEGREG1((idx), (selector), GP_EXCEPTION) void load_ss(UINT16 selector, const descriptor_t *sdp, int cpl); void load_cs(UINT16 selector, const descriptor_t *sdp, int cpl); void load_ldtr(UINT16 selector, int exc); /* * segment selector */ #define CPU_SEGMENT_SELECTOR_INDEX_MASK (~7) #define CPU_SEGMENT_SELECTOR_RPL_MASK (3) #define CPU_SEGMENT_TABLE_IND (1 << 2) /* 0 = GDT, 1 = LDT */ typedef struct { UINT16 selector; UINT16 idx; UINT16 rpl; UINT8 ldt; UINT8 pad; UINT32 addr; /* descriptor linear address */ descriptor_t desc; } selector_t; int parse_selector(selector_t *ssp, UINT16 selector); int selector_is_not_present(const selector_t *ssp); #ifdef __cplusplus } #endif #endif /* !IA32_CPU_SEGMENTS_H__ */