439f3d8b81
VM86 calls instead of the real mode emulator as a backend. VM86 has been proven reliable for very long time and it is actually few times faster than emulation. Increase maximum number of page table entries per VM86 context from 3 to 8 pages. It was (ridiculously) low and insufficient for new VM86 backend, which shares one context globally. Slighly rearrange and clean up the emulator backend to accommodate new code. The only visible change here is stack size, which is decreased from 64K to 4K bytes to sync. with VM86. Actually, it seems there is no need for big stack in real mode. MFC after: 1 month
157 lines
4.3 KiB
C
157 lines
4.3 KiB
C
/*-
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* Copyright (c) 2009 Alex Keda <admin@lissyara.su>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* x86 registers were borrowed from x86emu.h x86emu_regs.h
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* for compatability.
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*/
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#ifndef _X86BIOS_H_
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#define _X86BIOS_H_
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#include <sys/endian.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#ifdef __BIG_ENDIAN__
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struct x86_register32 {
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uint32_t e_reg;
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};
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struct x86_register16 {
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uint16_t filler0;
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uint16_t x_reg;
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};
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struct x86_register8 {
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uint8_t filler0;
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uint8_t filler1;
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uint8_t h_reg;
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uint8_t l_reg;
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};
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#else /* !__BIG_ENDIAN__ */
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struct x86_register32 {
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uint32_t e_reg;
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};
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struct x86_register16 {
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uint16_t x_reg;
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};
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struct x86_register8 {
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uint8_t l_reg;
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uint8_t h_reg;
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};
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#endif /* __BIG_ENDIAN__ */
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union x86_register {
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struct x86_register32 I32_reg;
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struct x86_register16 I16_reg;
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struct x86_register8 I8_reg;
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};
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struct x86regs {
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uint16_t _pad0; /* CS */
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uint16_t _pad1; /* DS */
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uint16_t register_es;
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uint16_t register_fs;
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uint16_t register_gs;
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uint16_t _pad2; /* SS */
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uint32_t register_flags;
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union x86_register register_a;
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union x86_register register_b;
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union x86_register register_c;
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union x86_register register_d;
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union x86_register _pad3; /* SP */
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union x86_register register_bp;
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union x86_register register_si;
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union x86_register register_di;
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};
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typedef struct x86regs x86regs_t;
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/* 8 bit registers */
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#define R_AH register_a.I8_reg.h_reg
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#define R_AL register_a.I8_reg.l_reg
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#define R_BH register_b.I8_reg.h_reg
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#define R_BL register_b.I8_reg.l_reg
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#define R_CH register_c.I8_reg.h_reg
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#define R_CL register_c.I8_reg.l_reg
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#define R_DH register_d.I8_reg.h_reg
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#define R_DL register_d.I8_reg.l_reg
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/* 16 bit registers */
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#define R_AX register_a.I16_reg.x_reg
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#define R_BX register_b.I16_reg.x_reg
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#define R_CX register_c.I16_reg.x_reg
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#define R_DX register_d.I16_reg.x_reg
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/* 32 bit extended registers */
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#define R_EAX register_a.I32_reg.e_reg
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#define R_EBX register_b.I32_reg.e_reg
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#define R_ECX register_c.I32_reg.e_reg
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#define R_EDX register_d.I32_reg.e_reg
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/* special registers */
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#define R_BP register_bp.I16_reg.x_reg
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#define R_SI register_si.I16_reg.x_reg
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#define R_DI register_di.I16_reg.x_reg
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#define R_FLG register_flags
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/* special registers */
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#define R_EBP register_bp.I32_reg.e_reg
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#define R_ESI register_si.I32_reg.e_reg
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#define R_EDI register_di.I32_reg.e_reg
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#define R_EFLG register_flags
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/* segment registers */
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#define R_ES register_es
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#define R_FS register_fs
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#define R_GS register_gs
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#define X86BIOS_PHYSTOSEG(x) (((x) >> 4) & 0xff00)
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#define X86BIOS_PHYSTOOFF(x) ((x) & 0x0fff)
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__BEGIN_DECLS
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void *x86bios_alloc(uint32_t *offset, size_t size, int flags);
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void x86bios_call(struct x86regs *regs, uint16_t seg, uint16_t off);
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void x86bios_free(void *addr, size_t size);
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uint32_t x86bios_get_intr(int intno);
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void *x86bios_get_orm(uint32_t offset);
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void x86bios_init_regs(struct x86regs *regs);
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void x86bios_intr(struct x86regs *regs, int intno);
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int x86bios_match_device(uint32_t offset, device_t dev);
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void *x86bios_offset(uint32_t offset);
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__END_DECLS
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#endif /* !_X86BIOS_H_ */
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