NetBSD-5.0.2/sys/arch/sun2/sun2/locore2.c
/* $NetBSD: locore2.c,v 1.18 2008/04/28 20:23:37 martin Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Glass, Gordon W. Ross, and Matthew Fredette.
*
* 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 1.18 2008/04/28 20:23:37 martin Exp $");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/user.h>
#define ELFSIZE 32
#include <sys/exec_elf.h>
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/db_machdep.h>
#include <machine/dvma.h>
#include <machine/idprom.h>
#include <machine/leds.h>
#include <machine/promlib.h>
#include <machine/pmap.h>
#include <machine/pte.h>
#include <machine/stdarg.h>
#include <sun2/sun2/control.h>
#include <sun2/sun2/machdep.h>
#include <sun68k/sun68k/vector.h>
#include "ksyms.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 mc68010, so these two variables are always ignored.
*/
int cputype = CPU_68010;
int mmutype = MMU_SUN;
/*
* Now our own stuff.
*/
u_char cpu_machine_id = 0;
const char *cpu_string = NULL;
int cpu_has_multibus = 0;
int cpu_has_vme = 0;
/*
* XXX - Should empirically estimate the divisor...
* Note that the value of delay_divisor is roughly
* 2048 / cpuclock (where cpuclock is in MHz).
*/
int delay_divisor = 82; /* assume the fastest (3/260) */
extern int physmem;
struct user *proc0paddr; /* proc[0] pcb address (u-area VA) */
extern struct pcb *curpcb;
/* First C code called by locore.s */
void _bootstrap(void);
static void _verify_hardware(void);
static void _vm_init(void);
#if NKSYMS || defined(DDB) || defined(LKM)
static void _save_symtab(void);
/*
* Preserve 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) {
prom_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 NKSYMS || defined(DDB) || defined(LKM)
/* 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.)
*/
proc0paddr = (struct user *) nextva;
nextva += USPACE;
memset((void *)proc0paddr, 0, USPACE);
lwp0.l_addr = proc0paddr;
/*
* Now that lwp0 exists, make it the "current" one.
*/
curlwp = &lwp0;
curpcb = &proc0paddr->u_pcb;
/* This does most of the real work. */
pmap_bootstrap(nextva);
}
/*
* Determine which Sun2 model we are running on.
*
* XXX: Just save idprom.idp_machtype here, and
* XXX: move the rest of this to identifycpu().
* XXX: Move cache_size stuff to cache.c.
*/
static void
_verify_hardware(void)
{
unsigned char machtype;
int cpu_match = 0;
machtype = identity_prom.idp_machtype;
if ((machtype & IDM_ARCH_MASK) != IDM_ARCH_SUN2) {
prom_printf("Bad IDPROM arch!\n");
prom_abort();
}
cpu_machine_id = machtype;
switch (cpu_machine_id) {
case ID_SUN2_120 :
cpu_match++;
cpu_string = "{120,170}";
delay_divisor = 205; /* 10 MHz */
cpu_has_multibus = true;
break;
case ID_SUN2_50 :
cpu_match++;
cpu_string = "50";
delay_divisor = 205; /* 10 MHz */
cpu_has_vme = true;
break;
default:
prom_printf("unknown sun2 model\n");
prom_abort();
}
if (!cpu_match) {
prom_printf("kernel not configured for the Sun 2 model\n");
prom_abort();
}
}
/*
* 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)
{
vaddr_t va;
/* First, Clear BSS. */
memset(edata, 0, end - edata);
/* Initialize the PROM. */
prom_init();
/* Copy the IDPROM from control space. */
idprom_init();
/* Validate the Sun2 model (from IDPROM). */
_verify_hardware();
/* Handle kernel mapping, pmap_bootstrap(), etc. */
_vm_init();
/*
* Point interrupts/exceptions to our vector table.
* (Until now, we use the one setup by the PROM.)
*/
setvbr((void **)vector_table);
/* Interrupts are enabled later, after autoconfig. */
/*
* Now unmap the PROM's physical/virtual pages zero through three.
*/
for(va = 0; va < PAGE_SIZE * 4; va += PAGE_SIZE)
set_pte(va, PG_INVAL);
/*
* Turn on the LEDs so we know power is on.
* Needs idprom_init and obio_init earlier.
*/
leds_init();
}