992 lines
30 KiB
C
992 lines
30 KiB
C
/* $NetBSD: rc7500_machdep.c,v 1.17 1998/08/29 03:17:28 mark Exp $ */
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/*
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* Copyright (c) 1994-1998 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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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* RiscBSD kernel project
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*
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* machdep.c
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*
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* Machine dependant functions for kernel setup
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*
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* This file needs a lot of work.
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*
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* Created : 17/09/94
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*/
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#include "opt_ddb.h"
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#include "opt_pmap_debug.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <sys/proc.h>
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#include <sys/msgbuf.h>
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#include <sys/exec.h>
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#include <dev/cons.h>
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#include <machine/db_machdep.h>
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#include <ddb/db_sym.h>
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#include <ddb/db_extern.h>
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#include <vm/vm_kern.h>
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#include <machine/signal.h>
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#include <machine/frame.h>
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#include <machine/bootconfig.h>
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#include <machine/cpu.h>
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#include <machine/io.h>
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#include <machine/irqhandler.h>
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#include <machine/katelib.h>
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#include <machine/pte.h>
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#include <machine/vidc.h>
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#include <machine/vconsole.h>
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#include <machine/undefined.h>
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#include <machine/rtc.h>
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#include <arm32/iomd/iomdreg.h>
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#include "ipkdb.h"
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#ifdef RC7500
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#include <arm32/rc7500/rc7500_prom.h>
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#endif
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/*
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* Address to call from cpu_reset() to reset the machine.
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* This is machine architecture dependant as it varies depending
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* on where the ROM appears when you turn the MMU off.
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*/
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u_int cpu_reset_address = 0;
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/* Define various stack sizes in pages */
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#define FIQ_STACK_SIZE 1
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#define IRQ_STACK_SIZE 1
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#define ABT_STACK_SIZE 1
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#if NIPKDB > 0
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#define UND_STACK_SIZE 2
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#else
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#define UND_STACK_SIZE 1
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#endif
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BootConfig bootconfig; /* Boot config storage */
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videomemory_t videomemory; /* Video memory descriptor */
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vm_offset_t physical_start;
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vm_offset_t physical_freestart;
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vm_offset_t physical_freeend;
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vm_offset_t physical_end;
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int physical_memoryblock;
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u_int free_pages;
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int physmem = 0;
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#ifndef PMAP_STATIC_L1S
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int max_processes = 64;
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#endif /* !PMAP_STATIC_L1S */
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u_int memory_disc_size; /* Memory disc size */
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u_int videodram_size; /* Amount of DRAM to reserve for video */
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vm_offset_t videodram_start;
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vm_offset_t physical_pt_start;
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vm_offset_t virtual_pt_end;
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/* Physical and virtual addresses for some global pages */
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pv_addr_t systempage;
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pv_addr_t irqstack;
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pv_addr_t undstack;
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pv_addr_t abtstack;
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pv_addr_t kernelstack;
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#ifdef RC7500
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pv_addr_t fiqstack;
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#endif
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char *boot_args;
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vm_offset_t msgbufphys;
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extern u_int data_abort_handler_address;
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extern u_int prefetch_abort_handler_address;
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extern u_int undefined_handler_address;
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#ifdef PMAP_DEBUG
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extern int pmap_debug_level;
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#endif /* PMAP_DEBUG */
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#define KERNEL_PT_VMEM 0 /* Page table for mapping video memory */
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#define KERNEL_PT_SYS 1 /* Page table for mapping proc0 zero page */
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#define KERNEL_PT_KERNEL 2 /* Page table for mapping kernel */
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#define KERNEL_PT_VMDATA 3 /* Page tables for mapping kernel VM */
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#define KERNEL_PT_VMDATA_NUM (KERNEL_VM_SIZE >> (PDSHIFT + 2))
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#define NUM_KERNEL_PTS (KERNEL_PT_VMDATA + KERNEL_PT_VMDATA_NUM)
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pt_entry_t kernel_pt_table[NUM_KERNEL_PTS];
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struct user *proc0paddr;
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extern int cold;
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/* Prototypes */
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void physconputchar __P((char));
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void physcon_display_base __P((u_int addr));
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extern void consinit __P((void));
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void map_section __P((vm_offset_t pt, vm_offset_t va, vm_offset_t pa,
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int cacheable));
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void map_pagetable __P((vm_offset_t pt, vm_offset_t va, vm_offset_t pa));
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void map_entry __P((vm_offset_t pt, vm_offset_t va, vm_offset_t pa));
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void map_entry_nc __P((vm_offset_t pt, vm_offset_t va, vm_offset_t pa));
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void map_entry_ro __P((vm_offset_t pt, vm_offset_t va, vm_offset_t pa));
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void pmap_bootstrap __P((vm_offset_t kernel_l1pt, pv_addr_t kernel_ptpt));
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caddr_t allocsys __P((caddr_t v));
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void data_abort_handler __P((trapframe_t *frame));
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void prefetch_abort_handler __P((trapframe_t *frame));
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void undefinedinstruction_bounce __P((trapframe_t *frame));
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void zero_page_readonly __P((void));
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void zero_page_readwrite __P((void));
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static void process_kernel_args __P((void));
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extern void dump_spl_masks __P((void));
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extern pt_entry_t *pmap_pte __P((pmap_t pmap, vm_offset_t va));
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extern void db_machine_init __P((void));
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extern void console_flush __P((void));
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extern void vidcconsole_reinit __P((void));
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extern int vidcconsole_blank __P((struct vconsole *vc, int type));
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extern void parse_mi_bootargs __P((char *args));
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void parse_rc7500_bootargs __P((char *args));
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extern void dumpsys __P((void));
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/*
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* void boot(int howto, char *bootstr)
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*
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* Reboots the system
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*
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* Deal with any syncing, unmounting, dumping and shutdown hooks,
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* then reset the CPU.
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*/
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/* NOTE: These variables will be removed, well some of them */
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extern u_int spl_mask;
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extern u_int current_mask;
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extern u_int arm700bugcount;
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void
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cpu_reboot(howto, bootstr)
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int howto;
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char *bootstr;
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{
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#ifdef DIAGNOSTIC
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printf("boot: howto=%08x curproc=%p\n", howto, curproc);
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printf("ipl_bio=%08x ipl_net=%08x ipl_tty=%08x ipl_imp=%08x\n",
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irqmasks[IPL_BIO], irqmasks[IPL_NET], irqmasks[IPL_TTY],
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irqmasks[IPL_IMP]);
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printf("ipl_audio=%08x ipl_clock=%08x ipl_none=%08x\n",
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irqmasks[IPL_AUDIO], irqmasks[IPL_CLOCK], irqmasks[IPL_NONE]);
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dump_spl_masks();
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/* Did we encounter the ARM700 bug we discovered ? */
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if (arm700bugcount > 0)
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printf("ARM700 PREFETCH/SWI bug count = %d\n", arm700bugcount);
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#endif
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/*
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* If we are still cold then hit the air brakes
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* and crash to earth fast
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*/
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if (cold) {
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doshutdownhooks();
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printf("Halted while still in the ICE age.\n");
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printf("The operating system has halted.\n");
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printf("Please press any key to reboot.\n\n");
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cngetc();
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printf("rebooting...\n");
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cpu_reset();
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/*NOTREACHED*/
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}
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/* Disable console buffering */
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cnpollc(1);
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/*
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* If RB_NOSYNC was not specified sync the discs.
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* Note: Unless cold is set to 1 here, syslogd will die during the unmount.
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* It looks like syslogd is getting woken up only to find that it cannot
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* page part of the binary in as the filesystem has been unmounted.
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*/
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if (!(howto & RB_NOSYNC))
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bootsync();
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/* Say NO to interrupts */
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splhigh();
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/* Do a dump if requested. */
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if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
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dumpsys();
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/*
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* Auto reboot overload protection
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*
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* This code stops the kernel entering an endless loop of reboot
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* - panic cycles. This will have the effect of stopping further
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* reboots after it has rebooted 8 times after panics. A clean
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* halt or reboot will reset the counter.
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*/
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/*
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* Have we done 8 reboots in a row ? If so halt rather than reboot
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* since 8 panics in a row without 1 clean halt means something is
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* seriously wrong.
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*/
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if (cmos_read(RTC_ADDR_REBOOTCNT) > 8)
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howto |= RB_HALT;
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/*
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* If we are rebooting on a panic then up the reboot count
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* otherwise reset.
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* This will thus be reset if the kernel changes the boot action from
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* reboot to halt due to too any reboots.
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*/
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if (((howto & RB_HALT) == 0) && panicstr)
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cmos_write(RTC_ADDR_REBOOTCNT,
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cmos_read(RTC_ADDR_REBOOTCNT) + 1);
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else
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cmos_write(RTC_ADDR_REBOOTCNT, 0);
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/*
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* If we need a RiscBSD reboot, request it buy setting a bit in
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* the CMOS RAM. This can be detected by the RiscBSD boot loader
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* during a RISCOS boot. No other way to do this as RISCOS is in ROM.
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*/
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if ((howto & RB_HALT) == 0)
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cmos_write(RTC_ADDR_BOOTOPTS,
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cmos_read(RTC_ADDR_BOOTOPTS) | 0x02);
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/* Run any shutdown hooks */
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doshutdownhooks();
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/* Make sure IRQ's are disabled */
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IRQdisable;
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if (howto & RB_HALT) {
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printf("The operating system has halted.\n");
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printf("Please press any key to reboot.\n\n");
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cngetc();
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}
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printf("rebooting...\n");
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cpu_reset();
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/*NOTREACHED*/
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}
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char bootstring[64];
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char bootargs[32];
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void setleds();
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u_int
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initarm(prom_id)
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struct prom_id *prom_id;
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{
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int loop;
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int loop1;
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u_int logical;
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u_int kerneldatasize;
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u_int l1pagetable;
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u_int l2pagetable;
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u_int vdrambase;
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u_int reserv_mem;
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extern char page0[], page0_end[];
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/* struct exec *kernexec = (struct exec *)KERNEL_TEXT_BASE;*/
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pv_addr_t kernel_l1pt;
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pv_addr_t kernel_ptpt;
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/*
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* Heads up ... Setup the CPU / MMU / TLB functions
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*/
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set_cpufuncs();
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/*
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* XXXX - FIX ME
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*/
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/* cpu_cache = 0x03;*/
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boothowto = 0;
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#ifndef MEMORY_DISK_SIZE
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#define MEMORY_DISK_SIZE 0
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#endif
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memory_disc_size = MEMORY_DISK_SIZE * 1024;
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#ifdef MEMORY_DISK_HOOKS
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boot_args = "root=/dev/md0a";
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#else
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if (strcmp(prom_id->bootdev, "fd") == 0) {
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boot_args = "root=/dev/fd0a";
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} else {
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strcpy(bootstring, "root=/dev/");
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strcat(bootstring, prom_id->bootdev);
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if (((prom_id->bootdevnum >> B_UNITSHIFT) & B_UNITMASK) == 0)
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strcat(bootstring, "0a");
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else
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strcat(bootstring, "1a");
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boot_args = bootstring;
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}
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#endif
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strcpy(bootargs, prom_id->bootargs);
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process_kernel_args();
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IRQdisable;
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/*
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* The old version of ROM did not set kstart field which
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* will be 0. The ROM reserve 32K bytes of memory at
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* low memory location. I need to fix this!!!
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*/
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if (prom_id->kstart == 0 || !(prom_id->kstart & 0x10000000))
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reserv_mem = 0x8000;
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else
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reserv_mem = prom_id->kstart - prom_id->physmem_start;
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bootconfig.kernvirtualbase = KERNEL_BASE;
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bootconfig.kernphysicalbase = 0x10000000 + reserv_mem;
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bootconfig.kernsize = (prom_id->ksize + NBPG - 1) & PG_FRAME;
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bootconfig.display_start = 0x10000000 + prom_id->video_start;
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bootconfig.display_size = prom_id->video_size;
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bootconfig.width = prom_id->display_width - 1;
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bootconfig.height = prom_id->display_height - 1;
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bootconfig.bitsperpixel = 3; /* it's actually 8 */
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bootconfig.dram[0].address = prom_id->physmem_start;
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bootconfig.dram[0].pages = prom_id->ramsize / NBPG;
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bootconfig.dramblocks = 1;
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bootconfig.pagesize = 4096;
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bootconfig.drampages = prom_id->ramsize / NBPG;
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strcpy(&bootconfig.kernelname[0], prom_id->bootfile);
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bootconfig.framerate = 0;
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/*
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videodram_size = 0x100000;
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*/
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videomemory.vidm_pbase = prom_id->physmem_end - videodram_size;
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vdrambase = videomemory.vidm_pbase;
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bootconfig.display_start = VMEM_VBASE;
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/*
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* Note: The video memory is not part of the managed memory.
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* Exclude these memory off the available DRAM.
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*/
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bootconfig.dram[0].pages -= videodram_size / NBPG;
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bootconfig.drampages -= videodram_size / NBPG;
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#ifdef PROM_DEBUG
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/*
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* Initialise the prom console
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*/
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init_prom_interface();
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/* Talk to the user */
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printf("initarm...\n");
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printf("Kernel loaded from file %s\n", bootconfig.kernelname);
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#endif
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/* Check to make sure the page size is correct */
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if (NBPG != bootconfig.pagesize)
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panic("Page size is not %d bytes\n", NBPG);
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/*
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* Ok now we have the hard bit.
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* We have the kernel allocated up high. The rest of the memory map is
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* available. We are still running on RISC OS page tables.
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*
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* We need to construct new page tables move the kernel in physical
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* memory and switch to them.
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*
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* The booter will have left us 6 pages at the top of memory.
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* Two of these are used as L2 page tables and the other 4 form the L1
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* page table.
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*/
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/*
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* Ok we must construct own own page table tables.
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* Once we have these we can reorganise the memory as required
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*/
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/*
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* We better check to make sure the booter has set up the scratch
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* area for us correctly. We use this area to create temporary
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* pagetables while we reorganise the memory map.
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*/
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/*
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* Update the videomemory structure to reflect the mapping changes
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*/
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videomemory.vidm_vbase = VMEM_VBASE;
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videomemory.vidm_pbase = vdrambase;
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videomemory.vidm_type = VIDEOMEM_TYPE_DRAM;
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videomemory.vidm_size = videodram_size;
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kerneldatasize = bootconfig.kernsize + bootconfig.argsize;
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/*
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* Ok we have finished the primary boot strap. All this has done is to
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* allow us to access all the physical memory from known virtual
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* location. We also now know that all the used pages are at the top
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* of the physical memory and where they are in the virtual memory map.
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*
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* This should be the stage we are at at the end of the bootstrap when
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* we have a two stage booter.
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*
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* The secondary bootstrap has the responcibility to sort locating the
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* kernel to the correct address and for creating the kernel page
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* tables. It must also set up various memory pointers that are used
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* by pmap etc.
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*/
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#ifdef PROM_DEBUG
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printf("initarm: Secondary bootstrap ... ");
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#endif
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/*
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* Set up the variables that define the availablilty of physcial
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* memory
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*/
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physical_start = bootconfig.dram[0].address;
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physical_freestart = physical_start + reserv_mem;
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physical_end = bootconfig.dram[bootconfig.dramblocks - 1].address
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+ bootconfig.dram[bootconfig.dramblocks - 1].pages * NBPG;
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physical_freeend = physical_end;
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physical_memoryblock = 0;
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free_pages = bootconfig.drampages - reserv_mem / NBPG;
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bootconfig.dram[0].address += reserv_mem;
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bootconfig.dram[0].pages -= reserv_mem / NBPG;
|
|
for (loop = 0; loop < bootconfig.dramblocks; ++loop)
|
|
physmem += bootconfig.dram[loop].pages;
|
|
|
|
#ifdef PROM_DEBUG
|
|
printf("physical_start=%lx, physical_freestart=%lx, physical_end=%x,"
|
|
" physical_freeend=%lx, free_pages=%x\n",
|
|
physical_start, physical_freestart,
|
|
physical_end, physical_freeend, free_pages);
|
|
#endif
|
|
|
|
/*
|
|
* Reserve some pages at the top of the memory for later use
|
|
*
|
|
* This area is not currently used but could be used for the allocation
|
|
* of L1 page tables for each process.
|
|
* The size of this memory would be determined by the maximum number of
|
|
* processes.
|
|
*
|
|
* For the moment we just reserve a few pages just to make sure the
|
|
* system copes.
|
|
*/
|
|
|
|
#if 0
|
|
/*
|
|
* Note: The DRAM video memory is already excluded from
|
|
* the free physical memory.
|
|
*/
|
|
physical_freeend -= videodram_size;
|
|
free_pages -= (videodram_size / NBPG);
|
|
videodram_start = physical_freeend;
|
|
#endif
|
|
|
|
#ifdef PROM_DEBUG
|
|
printf("physical_start=%lx, physical_freestart=%lx, physical_end=%lx,"
|
|
" physical_freeend=%lx, free_pages=%x\n",
|
|
physical_start, physical_freestart,
|
|
physical_end, physical_freeend, free_pages);
|
|
#endif
|
|
|
|
/* Right We have the bottom meg of memory mapped to 0x00000000
|
|
* so was can get at it. The kernel will ocupy the start of it.
|
|
* After the kernel/args we allocate some the the fixed page tables
|
|
* we need to get the system going.
|
|
* We allocate one page directory and 8 page tables and store the
|
|
* physical addresses in the kernel_pt_table array.
|
|
* Must remember that neither the page L1 or L2 page tables are the same
|
|
* size as a page !
|
|
*
|
|
* Ok the next bit of physical allocate may look complex but it is
|
|
* simple really. I have done it like this so that no memory gets wasted
|
|
* during the allocate of various pages and tables that are all different
|
|
* sizes.
|
|
* The start address will be page aligned.
|
|
* We allocate the kernel page directory on the first free 16KB boundry
|
|
* we find.
|
|
* We allocate the kernel page tables on the first 1KB boundry we find.
|
|
* We allocate 9 PT's. This means that in the process we
|
|
* KNOW that we will encounter at least 1 16KB boundry.
|
|
*
|
|
* Eventually if the top end of the memory gets used for process L1 page
|
|
* tables the kernel L1 page table may be moved up there.
|
|
*/
|
|
|
|
#ifdef VERBOSE_INIT_ARM
|
|
printf("Allocating page tables\n");
|
|
#endif
|
|
|
|
/* Update the address of the first free page of physical memory */
|
|
physical_freestart = physical_start + kerneldatasize + reserv_mem;
|
|
free_pages -= (physical_freestart - physical_start) / NBPG;
|
|
|
|
/* Define a macro to simplify memory allocation */
|
|
#define valloc_pages(var, np) \
|
|
alloc_pages((var).physical, (np)); \
|
|
(var).virtual = KERNEL_BASE + (var).physical - physical_start;
|
|
|
|
#define alloc_pages(var, np) \
|
|
(var) = physical_freestart; \
|
|
physical_freestart += ((np) * NBPG); \
|
|
free_pages -= (np); \
|
|
bzero((char *)(var) - physical_start, ((np) * NBPG));
|
|
|
|
loop1 = 0;
|
|
kernel_l1pt.physical = 0;
|
|
for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) {
|
|
/* Are we 16KB aligned for an L1 ? */
|
|
if ((physical_freestart & (PD_SIZE - 1)) == 0
|
|
&& kernel_l1pt.physical == 0) {
|
|
valloc_pages(kernel_l1pt, PD_SIZE / NBPG);
|
|
} else {
|
|
alloc_pages(kernel_pt_table[loop1], PT_SIZE / NBPG);
|
|
++loop1;
|
|
}
|
|
}
|
|
|
|
#ifdef PROM_DEBUG
|
|
/* A bit of debugging info */
|
|
for (loop = 0; loop < 10; ++loop)
|
|
printf("%d - P%08x\n", loop, kernel_pt_table[loop]);
|
|
#endif
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/* This should never be able to happen but better confirm that. */
|
|
if (!kernel_l1pt.physical || (kernel_l1pt.physical & (PD_SIZE-1)) != 0)
|
|
panic("initarm: Failed to align the kernel page directory\n");
|
|
#endif
|
|
|
|
#ifdef PROM_DEBUG
|
|
printf("physical_fs=%08lx next_phys=%08lx\n", physical_freestart,
|
|
pmap_next_phys_page(physical_freestart - NBPG));
|
|
#endif
|
|
|
|
/*
|
|
* Allocate a page for the system page mapped to V0x00000000
|
|
* This page will just contain the system vectors and can be
|
|
* shared by all processes.
|
|
*/
|
|
alloc_pages(systempage.physical, 1);
|
|
#ifdef PROM_DEBUG
|
|
printf("(0)physical_fs=%08lx next_phys=%08lx\n", physical_freestart,
|
|
pmap_next_phys_page(physical_freestart - NBPG));
|
|
#endif
|
|
|
|
/* Allocate a page for the page table to map kernel page tables*/
|
|
valloc_pages(kernel_ptpt, PT_SIZE / NBPG);
|
|
|
|
/* Allocate stacks for all modes */
|
|
valloc_pages(fiqstack, FIQ_STACK_SIZE);
|
|
valloc_pages(irqstack, IRQ_STACK_SIZE);
|
|
valloc_pages(abtstack, ABT_STACK_SIZE);
|
|
valloc_pages(undstack, UND_STACK_SIZE);
|
|
valloc_pages(kernelstack, UPAGES);
|
|
|
|
#ifdef VERBOSE_INIT_ARM
|
|
printf("IRQ stack: p0x%08lx v0x%08lx\n", irqstack.physical, irqstack.virtual);
|
|
printf("ABT stack: p0x%08lx v0x%08lx\n", abtstack.physical, abtstack.virtual);
|
|
printf("UND stack: p0x%08lx v0x%08lx\n", undstack.physical, undstack.virtual);
|
|
printf("SVC stack: p0x%08lx v0x%08lx\n", kernelstack.physical, kernelstack.virtual);
|
|
#endif
|
|
|
|
#ifdef PROM_DEBUG
|
|
printf("(1)physical_fs=%08lx next_phys=%08lx\n", physical_freestart,
|
|
(pmap_next_phys_page(physical_freestart - NBPG));
|
|
#endif
|
|
|
|
alloc_pages(msgbufphys, round_page(MSGBUFSIZE) / NBPG);
|
|
|
|
#ifdef PROM_DEBUG
|
|
printf("physical_fs=%08lx next_phys=%08lx\n", physical_freestart,
|
|
pmap_next_phys_page(physical_freestart - NBPG));
|
|
#endif
|
|
|
|
/*
|
|
* Ok we have allocated physical pages for the primary kernel
|
|
* page tables
|
|
*/
|
|
|
|
#ifdef VERBOSE_INIT_ARM
|
|
printf("Mapping kernel\n");
|
|
#endif
|
|
|
|
/* Now we fill in the L2 pagetable for the kernel code/data */
|
|
l2pagetable = kernel_pt_table[KERNEL_PT_KERNEL] - physical_start;
|
|
|
|
#if 0
|
|
if (N_GETMAGIC(kernexec[0]) == ZMAGIC) {
|
|
#ifdef PROM_DEBUG
|
|
printf("[ktext read-only] ");
|
|
printf("[%08x %08x %08x] \n", kerneldatasize, kernexec->a_text,
|
|
(kernexec->a_text+kernexec->a_data+kernexec->a_bss));
|
|
#if 0
|
|
printf("physical start=%08lx physical freestart=%08lx\n",
|
|
physical_start, physical_freestart);
|
|
#endif
|
|
#endif
|
|
|
|
for (logical = 0; logical < 0x00/*kernexec->a_text*/;
|
|
logical += NBPG)
|
|
map_entry_ro(l2pagetable, logical, physical_start + reserv_mem
|
|
+ logical);
|
|
for (; logical < kerneldatasize; logical += NBPG)
|
|
map_entry(l2pagetable, logical, physical_start + reserv_mem
|
|
+ logical);
|
|
} else
|
|
#endif
|
|
for (logical = 0; logical < kerneldatasize; logical += NBPG)
|
|
map_entry(l2pagetable, logical, physical_start + reserv_mem
|
|
+ logical);
|
|
|
|
#ifdef VERBOSE_INIT_ARM
|
|
printf("Constructing page tables\n");
|
|
#endif
|
|
|
|
/* Map the stack pages */
|
|
map_entry(l2pagetable, fiqstack.physical - physical_start,
|
|
fiqstack.physical);
|
|
map_entry(l2pagetable, irqstack.physical - physical_start,
|
|
irqstack.physical);
|
|
map_entry(l2pagetable, abtstack.physical - physical_start,
|
|
abtstack.physical);
|
|
for (loop = 0; loop < UND_STACK_SIZE; ++loop)
|
|
map_entry(l2pagetable, undstack.physical - physical_start + NBPG * loop,
|
|
undstack.physical + NBPG * loop);
|
|
for (loop = 0; loop < UPAGES; ++loop)
|
|
map_entry(l2pagetable, kernelstack.physical - physical_start + NBPG * loop,
|
|
kernelstack.physical + NBPG * loop);
|
|
for (loop = 0; loop < (PD_SIZE / NBPG); ++loop)
|
|
map_entry_nc(l2pagetable, kernel_l1pt.physical - physical_start + NBPG * loop,
|
|
kernel_l1pt.physical + NBPG * loop);
|
|
|
|
/* Map the page table that maps the kernel pages */
|
|
map_entry_nc(l2pagetable, kernel_ptpt.physical - physical_start,
|
|
kernel_ptpt.physical);
|
|
|
|
/* Now we fill in the L2 pagetable for the VRAM */
|
|
|
|
/*
|
|
* Current architectures mean that the VRAM is always in 1 continuous
|
|
* bank.
|
|
* This means that we can just map the 2 meg that the VRAM would occupy.
|
|
* In theory we don't need a page table for VRAM, we could section map
|
|
* it but we would need the page tables if DRAM was in use.
|
|
*/
|
|
|
|
l2pagetable = kernel_pt_table[KERNEL_PT_VMEM] - physical_start;
|
|
|
|
for (logical = 0; logical < videodram_size; logical += NBPG) {
|
|
map_entry(l2pagetable, logical, vdrambase + logical);
|
|
map_entry(l2pagetable, logical + videodram_size, vdrambase + logical);
|
|
}
|
|
|
|
/*
|
|
* Map entries in the page table used to map PTE's
|
|
* Basically every kernel page table gets mapped here
|
|
*/
|
|
/* The -2 is slightly bogus, it should be -log2(sizeof(pt_entry_t)) */
|
|
l2pagetable = kernel_ptpt.physical - physical_start;
|
|
map_entry(l2pagetable, (KERNEL_BASE >> (PGSHIFT-2)),
|
|
kernel_pt_table[KERNEL_PT_KERNEL]);
|
|
map_entry(l2pagetable, (PROCESS_PAGE_TBLS_BASE >> (PGSHIFT-2)),
|
|
kernel_ptpt.physical);
|
|
map_entry(l2pagetable, (VMEM_VBASE >> (PGSHIFT-2)),
|
|
kernel_pt_table[KERNEL_PT_VMEM]);
|
|
map_entry(l2pagetable, (0x00000000 >> (PGSHIFT-2)),
|
|
kernel_pt_table[KERNEL_PT_SYS]);
|
|
for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; ++loop) {
|
|
map_entry_nc(l2pagetable, ((KERNEL_VM_BASE +
|
|
(loop * 0x00400000)) >> (PGSHIFT-2)),
|
|
kernel_pt_table[KERNEL_PT_VMDATA + loop]);
|
|
}
|
|
|
|
/*
|
|
* Map the system page in the kernel page table for the bottom 1Meg
|
|
* of the virtual memory map.
|
|
*/
|
|
l2pagetable = kernel_pt_table[KERNEL_PT_SYS] - physical_start;
|
|
map_entry(l2pagetable, 0x0000000, systempage.physical);
|
|
|
|
/* Now we construct the L1 pagetable */
|
|
l1pagetable = kernel_l1pt.physical - physical_start;
|
|
|
|
/* Map the VIDC20, IOMD, COMBO and podules */
|
|
|
|
/* Map the VIDC20 */
|
|
map_section(l1pagetable, VIDC_BASE, VIDC_HW_BASE, 0);
|
|
|
|
/* Map the IOMD (and SLOW and MEDIUM simple podules) */
|
|
map_section(l1pagetable, IOMD_BASE, IOMD_HW_BASE, 0);
|
|
|
|
/* Map the COMBO (and module space) */
|
|
map_section(l1pagetable, IO_BASE, IO_HW_BASE, 0);
|
|
|
|
/* Map the L2 pages tables in the L1 page table */
|
|
map_pagetable(l1pagetable, 0x00000000,
|
|
kernel_pt_table[KERNEL_PT_SYS]);
|
|
map_pagetable(l1pagetable, KERNEL_BASE,
|
|
kernel_pt_table[KERNEL_PT_KERNEL]);
|
|
for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; ++loop)
|
|
map_pagetable(l1pagetable, KERNEL_VM_BASE + loop * 0x00400000,
|
|
kernel_pt_table[KERNEL_PT_VMDATA + loop]);
|
|
map_pagetable(l1pagetable, PROCESS_PAGE_TBLS_BASE,
|
|
kernel_ptpt.physical);
|
|
map_pagetable(l1pagetable, VMEM_VBASE,
|
|
kernel_pt_table[KERNEL_PT_VMEM]);
|
|
|
|
#ifdef PROM_DEBUG
|
|
/* Bit more debugging info */
|
|
printf("page tables look like this ...\n");
|
|
printf("V0x00000000 - %08x\n", ReadWord(l1pagetable + 0x0000));
|
|
printf("V0x03200000 - %08x\n", ReadWord(l1pagetable + 0x00c8));
|
|
printf("V0x03500000 - %08x\n", ReadWord(l1pagetable + 0x00d4));
|
|
printf("V0xf0000000 - %08x\n", ReadWord(l1pagetable + 0x3c00));
|
|
printf("V0xf1000000 - %08x\n", ReadWord(l1pagetable + 0x3c40));
|
|
printf("V0xf2000000 - %08x\n", ReadWord(l1pagetable + 0x3c80));
|
|
printf("V0xf3000000 - %08x\n", ReadWord(l1pagetable + 0x3cc0));
|
|
printf("V0xf3300000 - %08x\n", ReadWord(l1pagetable + 0x3ccc));
|
|
printf("V0xf4000000 - %08x\n", ReadWord(l1pagetable + 0x3d00));
|
|
printf("V0xf6000000 - %08x\n", ReadWord(l1pagetable + 0x3d80));
|
|
printf("V0xefc00000 - %08x\n", ReadWord(l1pagetable + 0x3bf8));
|
|
printf("V0xef800000 - %08x\n", ReadWord(l1pagetable + 0x3bfc));
|
|
promcngetc();
|
|
#endif
|
|
|
|
/*
|
|
* Now we have the real page tables in place so we can switch to them.
|
|
* Once this is done we will be running with the REAL kernel page tables.
|
|
*/
|
|
|
|
/*
|
|
* The last thing we must do is copy the kernel down to the new memory.
|
|
* This copies all our kernel data structures and variables as well
|
|
* which is why it is left to the last moment.
|
|
*/
|
|
|
|
#if 0
|
|
bcopy((char *)KERNEL_TEXT_BASE, (char *)0x00000000, kerneldatasize);
|
|
#endif
|
|
|
|
cpu_domains(DOMAIN_CLIENT);
|
|
|
|
/*
|
|
* When we get here, the ROM is still running, we need to
|
|
* turn all the interrupts off before switching TTB.
|
|
*/
|
|
irq_init();
|
|
IRQdisable;
|
|
|
|
setleds(LEDOFF); /* turns off LEDs */
|
|
|
|
/* Switch tables */
|
|
#ifdef VERBOSE_INIT_ARM
|
|
printf("switching to new L1 page table\n");
|
|
#endif
|
|
|
|
setttb(kernel_l1pt.physical);
|
|
|
|
/*
|
|
* We must now clean the cache again....
|
|
* Cleaning may be done by reading new data to displace any
|
|
* dirty data in the cache. This will have happened in setttb()
|
|
* but since we are boot strapping the addresses used for the read
|
|
* may have just been remapped and thus the cache could be out
|
|
* of sync. A re-clean after the switch will cure this.
|
|
* After booting there are no gross reloations of the kernel thus
|
|
* this problem wil not occur after initarm().
|
|
*/
|
|
cpu_cache_cleanID();
|
|
|
|
setleds(LEDALL);
|
|
consinit();
|
|
|
|
setleds(LEDOFF);
|
|
|
|
/* Right set up the vectors at the bottom of page 0 */
|
|
bcopy(page0, (char *)0x00000000, page0_end - page0);
|
|
|
|
/* We have modified a text page so sync the icache */
|
|
cpu_cache_syncI_rng(0, page0_end - page0);
|
|
|
|
/*
|
|
* Pages were allocated during the secondary bootstrap for the
|
|
* stacks for different CPU modes.
|
|
* We must now set the r13 registers in the different CPU modes to
|
|
* point to these stacks.
|
|
* Since the ARM stacks use STMFD etc. we must set r13 to the top end
|
|
* of the stack memory.
|
|
*/
|
|
printf("init subsystems: stacks ");
|
|
|
|
set_stackptr(PSR_FIQ32_MODE, fiqstack.virtual + FIQ_STACK_SIZE * NBPG);
|
|
set_stackptr(PSR_IRQ32_MODE, irqstack.virtual + IRQ_STACK_SIZE * NBPG);
|
|
set_stackptr(PSR_ABT32_MODE, abtstack.virtual + ABT_STACK_SIZE * NBPG);
|
|
set_stackptr(PSR_UND32_MODE, undstack.virtual + UND_STACK_SIZE * NBPG);
|
|
|
|
/*
|
|
* Well we should set a data abort handler.
|
|
* Once things get going this will change as we will need a proper handler.
|
|
* Until then we will use a handler that just panics but tells us
|
|
* why.
|
|
* Initialisation of the vectors will just panic on a data abort.
|
|
* This just fills in a slighly better one.
|
|
*/
|
|
printf("vectors ");
|
|
data_abort_handler_address = (u_int)data_abort_handler;
|
|
prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
|
|
undefined_handler_address = (u_int)undefinedinstruction_bounce;
|
|
|
|
#if 0
|
|
/* Diagnostic stuff. while writing the boot code */
|
|
for (loop = 0x0; loop < 0x1000; ++loop) {
|
|
if (ReadWord(PAGE_DIRS_BASE + loop * 4) != 0)
|
|
printf("Pagetable for V%08x = %08x\n", loop << 20,
|
|
ReadWord(0xf2000000 + loop * 4));
|
|
}
|
|
|
|
for (loop = 0x0; loop < 0x400; ++loop) {
|
|
if (ReadWord(kernel_pt_table[KERNEL_PT_PTE] + loop * 4) != 0)
|
|
printf("Pagetable for V%08x P%08x = %08x\n",
|
|
loop << 22, kernel_pt_table[KERNEL_PT_PTE]+loop*4,
|
|
ReadWord(kernel_pt_table[KERNEL_PT_PTE]+loop * 4));
|
|
}
|
|
#endif
|
|
|
|
/* At last !
|
|
* We now have the kernel in physical memory from the bottom upwards.
|
|
* Kernel page tables are physically above this.
|
|
* The kernel is mapped to 0xf0000000
|
|
* The kernel data PTs will handle the mapping of 0xf1000000-0xf1ffffff
|
|
* 2Meg of VRAM is mapped to 0xf4000000
|
|
* The page tables are mapped to 0xefc00000
|
|
* The IOMD is mapped to 0xf6000000
|
|
* The VIDC is mapped to 0xf6100000
|
|
*/
|
|
|
|
/* Initialise the undefined instruction handlers */
|
|
printf("undefined ");
|
|
undefined_init();
|
|
console_flush();
|
|
|
|
/* Boot strap pmap telling it where the kernel page table is */
|
|
printf("pmap ");
|
|
pmap_bootstrap(kernel_l1pt.virtual, kernel_ptpt);
|
|
console_flush();
|
|
|
|
/* Setup the IRQ system */
|
|
printf("irq ");
|
|
console_flush();
|
|
irq_init();
|
|
printf("done.\n");
|
|
|
|
#if NIPKDB > 0
|
|
/* Initialise ipkdb */
|
|
ipkdb_init();
|
|
if (boothowto & RB_KDB)
|
|
ipkdb_connect(0);
|
|
#endif
|
|
|
|
#ifdef DDB
|
|
printf("ddb: ");
|
|
db_machine_init();
|
|
{
|
|
extern int end;
|
|
extern int *esym;
|
|
|
|
ddb_init(*(int *)&end, ((int *)&end) + 1, esym);
|
|
}
|
|
|
|
if (boothowto & RB_KDB)
|
|
Debugger();
|
|
#endif
|
|
|
|
/* We return the new stack pointer address */
|
|
return(kernelstack.virtual + USPACE_SVC_STACK_TOP);
|
|
}
|
|
|
|
static void
|
|
process_kernel_args(void)
|
|
{
|
|
parse_mi_bootargs(bootargs);
|
|
parse_rc7500_bootargs(bootargs);
|
|
}
|
|
|
|
void
|
|
parse_rc7500_bootargs(args)
|
|
char *args;
|
|
{
|
|
int integer;
|
|
|
|
videodram_size = 0x100000;
|
|
if (get_bootconf_option(args, "m", BOOTOPT_TYPE_INT, &integer)) {
|
|
if (integer >= 2 || integer <= 4)
|
|
videodram_size *= integer;
|
|
}
|
|
}
|
|
|
|
void
|
|
setleds(led)
|
|
int led;
|
|
{
|
|
outb(LEDPORT, ~led & 0xff);
|
|
}
|
|
|
|
/* End of rc7500_machdep.c */
|