afa8862328
a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/*-
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* Copyright (c) 1995 Bruce D. Evans.
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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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* 3. Neither the name of the author nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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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#ifndef _MACHINE_MD_VAR_H_
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#define _MACHINE_MD_VAR_H_
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/*
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* Miscellaneous machine-dependent declarations.
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*/
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extern long Maxmem;
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extern u_int atdevbase; /* offset in virtual memory of ISA io mem */
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extern int busdma_swi_pending;
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extern u_int cpu_exthigh;
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extern u_int cpu_feature;
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extern u_int cpu_fxsr;
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extern u_int cpu_high;
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extern u_int cpu_id;
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extern u_int cpu_procinfo;
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extern char cpu_vendor[];
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extern uint16_t *elan_mmcr;
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extern char kstack[];
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extern char sigcode[];
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extern int szsigcode;
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typedef void alias_for_inthand_t(u_int cs, u_int ef, u_int esp, u_int ss);
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struct thread;
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struct reg;
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struct fpreg;
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struct dbreg;
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void bcopyb(const void *from, void *to, size_t len);
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void busdma_swi(void);
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void cpu_halt(void);
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void cpu_reset(void);
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void cpu_setregs(void);
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void doreti_iret(void) __asm(__STRING(doreti_iret));
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void doreti_iret_fault(void) __asm(__STRING(doreti_iret_fault));
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void enable_sse(void);
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void fillw(int /*u_short*/ pat, void *base, size_t cnt);
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void pagezero(void *addr);
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int is_physical_memory(vm_offset_t addr);
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void setidt(int idx, alias_for_inthand_t *func, int typ, int dpl, int ist);
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void swi_vm(void *);
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#endif /* !_MACHINE_MD_VAR_H_ */
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