244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
/* $NetBSD: locore2.c,v 1.39 2012/08/10 14:33:35 tsutsui Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1996 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Gordon W. Ross and Jeremy Cooper.
|
|
*
|
|
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``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 FOUNDATION OR CONTRIBUTORS
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: locore2.c,v 1.39 2012/08/10 14:33:35 tsutsui Exp $");
|
|
|
|
#include "opt_ddb.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/reboot.h>
|
|
#define ELFSIZE 32
|
|
#include <sys/exec_elf.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
#include <dev/cons.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/db_machdep.h>
|
|
#include <machine/dvma.h>
|
|
#include <machine/idprom.h>
|
|
#include <machine/leds.h>
|
|
#include <machine/mon.h>
|
|
#include <machine/pmap.h>
|
|
#include <machine/pte.h>
|
|
|
|
#include <sun3/sun3/interreg.h>
|
|
#include <sun3/sun3/machdep.h>
|
|
#include <sun68k/sun68k/vector.h>
|
|
|
|
/* This is defined in locore.s */
|
|
extern char kernel_text[];
|
|
|
|
/* These are defined by the linker */
|
|
extern char etext[], edata[], end[];
|
|
int nsym;
|
|
char *ssym, *esym;
|
|
|
|
/*
|
|
* XXX: m68k common code needs these...
|
|
* ... but this port does not need to deal with anything except
|
|
* an mc68030, so these two variables are always ignored.
|
|
*/
|
|
int cputype = CPU_68030;
|
|
int mmutype = MMU_68030;
|
|
|
|
/*
|
|
* Now our own stuff.
|
|
*/
|
|
|
|
extern struct pcb *curpcb;
|
|
|
|
/* First C code called by locore.s */
|
|
void _bootstrap(void);
|
|
|
|
static void _vm_init(void);
|
|
|
|
#if defined(DDB)
|
|
static void _save_symtab(void);
|
|
|
|
/*
|
|
* Preserve DDB symbols and strings by setting esym.
|
|
*/
|
|
static void
|
|
_save_symtab(void)
|
|
{
|
|
int i;
|
|
Elf_Ehdr *ehdr;
|
|
Elf_Shdr *shp;
|
|
vaddr_t minsym, maxsym;
|
|
|
|
/*
|
|
* Check the ELF headers.
|
|
*/
|
|
|
|
ehdr = (void *)end;
|
|
if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) != 0 ||
|
|
ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
|
|
mon_printf("_save_symtab: bad ELF magic\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Find the end of the symbols and strings.
|
|
*/
|
|
|
|
maxsym = 0;
|
|
minsym = ~maxsym;
|
|
shp = (Elf_Shdr *)(end + ehdr->e_shoff);
|
|
for (i = 0; i < ehdr->e_shnum; i++) {
|
|
if (shp[i].sh_type != SHT_SYMTAB &&
|
|
shp[i].sh_type != SHT_STRTAB) {
|
|
continue;
|
|
}
|
|
minsym = min(minsym, (vaddr_t)end + shp[i].sh_offset);
|
|
maxsym = max(maxsym, (vaddr_t)end + shp[i].sh_offset +
|
|
shp[i].sh_size);
|
|
}
|
|
nsym = 1;
|
|
ssym = (char *)ehdr;
|
|
esym = (char *)maxsym;
|
|
}
|
|
#endif /* DDB */
|
|
|
|
/*
|
|
* This function is called from _bootstrap() to initialize
|
|
* pre-vm-sytem virtual memory. All this really does is to
|
|
* set virtual_avail to the first page following preloaded
|
|
* data (i.e. the kernel and its symbol table) and special
|
|
* things that may be needed very early (lwp0 upages).
|
|
* Once that is done, pmap_bootstrap() is called to do the
|
|
* usual preparations for our use of the MMU.
|
|
*/
|
|
static void
|
|
_vm_init(void)
|
|
{
|
|
vaddr_t nextva;
|
|
|
|
/*
|
|
* First preserve our symbol table, which might have been
|
|
* loaded after our BSS area by the boot loader. However,
|
|
* if DDB is not part of this kernel, ignore the symbols.
|
|
*/
|
|
esym = end + 4;
|
|
#if defined(DDB)
|
|
/* This will advance esym past the symbols. */
|
|
_save_symtab();
|
|
#endif
|
|
|
|
/*
|
|
* Steal some special-purpose, already mapped pages.
|
|
* Note: msgbuf is setup in machdep.c:cpu_startup()
|
|
*/
|
|
nextva = m68k_round_page(esym);
|
|
|
|
/*
|
|
* Setup the u-area pages (stack, etc.) for lwp0.
|
|
* This is done very early (here) to make sure the
|
|
* fault handler works in case we hit an early bug.
|
|
* (The fault handler may reference lwp0 stuff.)
|
|
*/
|
|
uvm_lwp_setuarea(&lwp0, nextva);
|
|
memset((void *)nextva, 0, USPACE);
|
|
|
|
nextva += USPACE;
|
|
|
|
/*
|
|
* Now that lwp0 exists, make it the "current" one.
|
|
*/
|
|
curlwp = &lwp0;
|
|
curpcb = lwp_getpcb(&lwp0);
|
|
|
|
/* This does most of the real work. */
|
|
pmap_bootstrap(nextva);
|
|
}
|
|
|
|
/*
|
|
* This is called from locore.s just after the kernel is remapped
|
|
* to its proper address, but before the call to main(). The work
|
|
* done here corresponds to various things done in locore.s on the
|
|
* hp300 port (and other m68k) but which we prefer to do in C code.
|
|
* Also do setup specific to the Sun PROM monitor and IDPROM here.
|
|
*/
|
|
void
|
|
_bootstrap(void)
|
|
{
|
|
extern struct consdev consdev_prom; /* XXX */
|
|
|
|
/* First, Clear BSS. */
|
|
memset(edata, 0, end - edata);
|
|
|
|
/* Set v_handler, get boothowto. */
|
|
sunmon_init();
|
|
|
|
/*
|
|
* Initialize console to point to the PROM (output only) table
|
|
* for early printf calls.
|
|
*/
|
|
cn_tab = &consdev_prom;
|
|
|
|
/* Handle kernel mapping, pmap_bootstrap(), etc. */
|
|
_vm_init();
|
|
|
|
/*
|
|
* Find and save OBIO mappings needed early,
|
|
* and call some init functions.
|
|
*/
|
|
obio_init();
|
|
|
|
/*
|
|
* Point interrupts/exceptions to our vector table.
|
|
* (Until now, we use the one setup by the PROM.)
|
|
*
|
|
* This is done after obio_init() / intreg_init() finds
|
|
* the interrupt register and disables the NMI clock so
|
|
* it will not cause "spurrious level 7" complaints.
|
|
* Done after _vm_init so the PROM can debug that.
|
|
*/
|
|
setvbr((void **)vector_table);
|
|
/* Interrupts are enabled later, after autoconfig. */
|
|
|
|
/*
|
|
* Find the IDPROM and copy it to memory.
|
|
* Needs obio_init and setvbr earlier.
|
|
*/
|
|
idprom_init();
|
|
|
|
/*
|
|
* Turn on the LEDs so we know power is on.
|
|
* Needs idprom_init and obio_init earlier.
|
|
*/
|
|
leds_init();
|
|
}
|