359 lines
7.9 KiB
C
359 lines
7.9 KiB
C
/*-
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* Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/imgact.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/cons.h>
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#include <sys/exec.h>
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#include <sys/ucontext.h>
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#include <sys/proc.h>
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#include <sys/kdb.h>
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#include <sys/ptrace.h>
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#include <sys/reboot.h>
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#include <sys/signalvar.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/user.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <machine/clock.h>
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#include <machine/cpu.h>
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#include <machine/cpuregs.h>
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#include <machine/hwfunc.h>
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#include <machine/md_var.h>
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#include <machine/pmap.h>
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#include <machine/trap.h>
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#ifdef TICK_USE_YAMON_FREQ
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#include <mips/malta/yamon.h>
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#endif
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#ifdef TICK_USE_MALTA_RTC
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#include <mips/mips4k/malta/maltareg.h>
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#include <dev/mc146818/mc146818reg.h>
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#include <isa/rtc.h>
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#endif
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#include <mips/malta/maltareg.h>
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extern int *edata;
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extern int *end;
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void lcd_init(void);
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void lcd_puts(char *);
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void malta_reset(void);
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/*
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* Temporary boot environment used at startup.
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*/
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static char boot1_env[4096];
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/*
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* Offsets to MALTA LCD characters.
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*/
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static int malta_lcd_offs[] = {
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MALTA_ASCIIPOS0,
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MALTA_ASCIIPOS1,
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MALTA_ASCIIPOS2,
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MALTA_ASCIIPOS3,
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MALTA_ASCIIPOS4,
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MALTA_ASCIIPOS5,
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MALTA_ASCIIPOS6,
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MALTA_ASCIIPOS7
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};
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void
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platform_cpu_init()
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{
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/* Nothing special */
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}
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/*
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* Put character to Malta LCD at given position.
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*/
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static void
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malta_lcd_putc(int pos, char c)
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{
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void *addr;
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char *ch;
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if (pos < 0 || pos > 7)
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return;
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addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
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ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
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*ch = c;
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}
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/*
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* Print given string on LCD.
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*/
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static void
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malta_lcd_print(char *str)
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{
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int i;
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if (str == NULL)
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return;
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for (i = 0; *str != '\0'; i++, str++)
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malta_lcd_putc(i, *str);
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}
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void
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lcd_init(void)
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{
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malta_lcd_print("FreeBSD_");
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}
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void
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lcd_puts(char *s)
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{
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malta_lcd_print(s);
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}
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#ifdef TICK_USE_MALTA_RTC
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static __inline uint8_t
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rtcin(uint8_t addr)
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{
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*((volatile uint8_t *)
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MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
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return (*((volatile uint8_t *)
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MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
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}
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static __inline void
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writertc(uint8_t addr, uint8_t val)
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{
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*((volatile uint8_t *)
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MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
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*((volatile uint8_t *)
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MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
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}
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#endif
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static void
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mips_init(unsigned long memsize, uint64_t ememsize)
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{
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int i;
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for (i = 0; i < PHYS_AVAIL_ENTRIES; i++) {
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phys_avail[i] = 0;
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}
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/*
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* memsize is the amount of RAM available below 256MB.
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* ememsize is the total amount of RAM available.
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*
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* The second bank starts at 0x90000000.
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*/
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/* phys_avail regions are in bytes */
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phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
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phys_avail[1] = memsize;
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dump_avail[0] = phys_avail[0];
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dump_avail[1] = phys_avail[1];
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/* Only specify the extended region if it's set */
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if (ememsize > memsize) {
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phys_avail[2] = 0x90000000;
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phys_avail[3] = 0x90000000 + (ememsize - memsize);
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dump_avail[2] = phys_avail[2];
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dump_avail[3] = phys_avail[3];
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}
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/* XXX realmem assigned in the caller of mips_init() */
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physmem = realmem;
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init_param1();
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init_param2(physmem);
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mips_cpu_init();
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pmap_bootstrap();
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mips_proc0_init();
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mutex_init();
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kdb_init();
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#ifdef KDB
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if (boothowto & RB_KDB)
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kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
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#endif
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}
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/*
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* Perform a board-level soft-reset.
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* Note that this is not emulated by gxemul.
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*/
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void
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platform_reset(void)
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{
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char *c;
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c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
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*c = MALTA_GORESET;
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}
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static uint64_t
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malta_cpu_freq(void)
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{
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uint64_t platform_counter_freq = 0;
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#if defined(TICK_USE_YAMON_FREQ)
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/*
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* If we are running on a board which uses YAMON firmware,
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* then query CPU pipeline clock from the syscon object.
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* If unsuccessful, use hard-coded default.
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*/
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platform_counter_freq = yamon_getcpufreq();
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#elif defined(TICK_USE_MALTA_RTC)
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/*
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* If we are running on a board with the MC146818 RTC,
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* use it to determine CPU pipeline clock frequency.
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*/
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u_int64_t counterval[2];
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/* Set RTC to binary mode. */
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writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
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/* Busy-wait for falling edge of RTC update. */
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while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
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;
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while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
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;
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counterval[0] = mips_rd_count();
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/* Busy-wait for falling edge of RTC update. */
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while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
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;
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while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
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;
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counterval[1] = mips_rd_count();
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platform_counter_freq = counterval[1] - counterval[0];
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#endif
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if (platform_counter_freq == 0)
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platform_counter_freq = MIPS_DEFAULT_HZ;
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return (platform_counter_freq);
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}
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void
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platform_start(__register_t a0, __register_t a1, __register_t a2,
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__register_t a3)
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{
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vm_offset_t kernend;
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uint64_t platform_counter_freq;
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int argc = a0;
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int32_t *argv = (int32_t*)a1;
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int32_t *envp = (int32_t*)a2;
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unsigned int memsize = a3;
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uint64_t ememsize = 0;
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int i;
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/* clear the BSS and SBSS segments */
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kernend = (vm_offset_t)&end;
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memset(&edata, 0, kernend - (vm_offset_t)(&edata));
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mips_postboot_fixup();
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mips_pcpu0_init();
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platform_counter_freq = malta_cpu_freq();
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mips_timer_early_init(platform_counter_freq);
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init_static_kenv(boot1_env, sizeof(boot1_env));
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cninit();
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printf("entry: platform_start()\n");
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bootverbose = 1;
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/*
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* YAMON uses 32bit pointers to strings so
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* convert them to proper type manually
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*/
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if (bootverbose) {
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printf("cmd line: ");
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for (i = 0; i < argc; i++)
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printf("%s ", (char*)(intptr_t)argv[i]);
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printf("\n");
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}
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if (bootverbose)
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printf("envp:\n");
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/*
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* Parse the environment for things like ememsize.
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*/
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for (i = 0; envp[i]; i += 2) {
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const char *a, *v;
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a = (char *)(intptr_t)envp[i];
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v = (char *)(intptr_t)envp[i+1];
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if (bootverbose)
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printf("\t%s = %s\n", a, v);
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if (strcmp(a, "ememsize") == 0) {
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ememsize = strtoul(v, NULL, 0);
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}
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}
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if (bootverbose) {
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printf("memsize = %llu (0x%08x)\n",
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(unsigned long long) memsize, memsize);
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printf("ememsize = %llu\n", (unsigned long long) ememsize);
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}
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/*
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* For <= 256MB RAM amounts, ememsize should equal memsize.
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* For > 256MB RAM amounts it's the total RAM available;
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* split between two banks.
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*
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* XXX TODO: just push realmem assignment into mips_init() ?
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*/
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realmem = btoc(ememsize);
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mips_init(memsize, ememsize);
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mips_timer_init_params(platform_counter_freq, 0);
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}
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