433 lines
9.0 KiB
C
433 lines
9.0 KiB
C
/*-
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* Copyright (c) 2007 Bruce M. Simpson.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_kdb.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 <sys/timetc.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/cache.h>
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#include <machine/clock.h>
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#include <machine/cpu.h>
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#include <machine/cpuinfo.h>
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#include <machine/cpufunc.h>
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#include <machine/cpuregs.h>
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#include <machine/hwfunc.h>
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#include <machine/intr_machdep.h>
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#include <machine/locore.h>
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#include <machine/md_var.h>
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#include <machine/pte.h>
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#include <machine/sigframe.h>
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#include <machine/trap.h>
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#include <machine/vmparam.h>
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#ifdef SMP
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#include <sys/smp.h>
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#include <machine/smp.h>
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#endif
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#ifdef CFE
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#include <dev/cfe/cfe_api.h>
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#endif
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#include "sb_scd.h"
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#ifdef DDB
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#ifndef KDB
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#error KDB must be enabled in order for DDB to work!
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#endif
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#endif
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#ifdef CFE_ENV
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extern void cfe_env_init(void);
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#endif
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extern int *edata;
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extern int *end;
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extern char MipsTLBMiss[], MipsTLBMissEnd[];
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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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static void
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sb_intr_init(int cpuid)
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{
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int intrnum, intsrc;
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/*
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* Disable all sources to the interrupt mapper and setup the mapping
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* between an interrupt source and the mips hard interrupt number.
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*/
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for (intsrc = 0; intsrc < NUM_INTSRC; ++intsrc) {
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intrnum = sb_route_intsrc(intsrc);
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sb_disable_intsrc(cpuid, intsrc);
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sb_write_intmap(cpuid, intsrc, intrnum);
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#ifdef SMP
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/*
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* Set up the mailbox interrupt mapping.
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*
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* The mailbox interrupt is "special" in that it is not shared
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* with any other interrupt source.
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*/
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if (intsrc == INTSRC_MAILBOX3) {
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intrnum = platform_ipi_intrnum();
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sb_write_intmap(cpuid, INTSRC_MAILBOX3, intrnum);
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sb_enable_intsrc(cpuid, INTSRC_MAILBOX3);
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}
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#endif
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}
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}
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static void
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mips_init(void)
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{
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int i, j, cfe_mem_idx, tmp;
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uint64_t maxmem;
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#ifdef CFE_ENV
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cfe_env_init();
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#endif
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TUNABLE_INT_FETCH("boothowto", &boothowto);
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if (boothowto & RB_VERBOSE)
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bootverbose++;
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#ifdef MAXMEM
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tmp = MAXMEM;
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#else
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tmp = 0;
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#endif
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TUNABLE_INT_FETCH("hw.physmem", &tmp);
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maxmem = (uint64_t)tmp * 1024;
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/*
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* XXX
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* If we used vm_paddr_t consistently in pmap, etc., we could
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* use 64-bit page numbers on !n64 systems, too, like i386
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* does with PAE.
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*/
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#if !defined(__mips_n64)
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if (maxmem == 0 || maxmem > 0xffffffff)
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maxmem = 0xffffffff;
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#endif
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#ifdef CFE
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/*
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* Query DRAM memory map from CFE.
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*/
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physmem = 0;
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cfe_mem_idx = 0;
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for (i = 0; i < 10; i += 2) {
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int result;
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uint64_t addr, len, type;
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result = cfe_enummem(cfe_mem_idx++, 0, &addr, &len, &type);
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if (result < 0) {
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phys_avail[i] = phys_avail[i + 1] = 0;
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break;
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}
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KASSERT(type == CFE_MI_AVAILABLE,
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("CFE DRAM region is not available?"));
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if (bootverbose)
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printf("cfe_enummem: 0x%016jx/%ju.\n", addr, len);
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if (maxmem != 0) {
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if (addr >= maxmem) {
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printf("Ignoring %ju bytes of memory at 0x%jx "
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"that is above maxmem %dMB\n",
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len, addr,
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(int)(maxmem / (1024 * 1024)));
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continue;
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}
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if (addr + len > maxmem) {
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printf("Ignoring %ju bytes of memory "
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"that is above maxmem %dMB\n",
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(addr + len) - maxmem,
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(int)(maxmem / (1024 * 1024)));
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len = maxmem - addr;
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}
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}
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phys_avail[i] = addr;
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if (i == 0 && addr == 0) {
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/*
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* If this is the first physical memory segment probed
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* from CFE, omit the region at the start of physical
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* memory where the kernel has been loaded.
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*/
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phys_avail[i] += MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
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}
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phys_avail[i + 1] = addr + len;
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physmem += len;
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}
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realmem = btoc(physmem);
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#endif
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for (j = 0; j < i; j++)
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dump_avail[j] = phys_avail[j];
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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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/*
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* Sibyte has a L1 data cache coherent with DMA. This includes
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* on-chip network interfaces as well as PCI/HyperTransport bus
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* masters.
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*/
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cpuinfo.cache_coherent_dma = TRUE;
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/*
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* XXX
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* The kernel is running in 32-bit mode but the CFE is running in
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* 64-bit mode. So the SR_KX bit in the status register is turned
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* on by the CFE every time we call into it - for e.g. CFE_CONSOLE.
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*
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* This means that if get a TLB miss for any address above 0xc0000000
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* and the SR_KX bit is set then we will end up in the XTLB exception
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* vector.
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*
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* For now work around this by copying the TLB exception handling
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* code to the XTLB exception vector.
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*/
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{
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bcopy(MipsTLBMiss, (void *)MIPS_XTLB_MISS_EXC_VEC,
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MipsTLBMissEnd - MipsTLBMiss);
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mips_icache_sync_all();
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mips_dcache_wbinv_all();
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}
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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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void
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platform_reset(void)
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{
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/*
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* XXX SMP
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* XXX flush data caches
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*/
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sb_system_reset();
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}
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static void
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kseg0_map_coherent(void)
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{
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uint32_t config;
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const int CFG_K0_COHERENT = 5;
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config = mips_rd_config();
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config &= ~MIPS_CONFIG_K0_MASK;
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config |= CFG_K0_COHERENT;
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mips_wr_config(config);
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}
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#ifdef SMP
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void
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platform_ipi_send(int cpuid)
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{
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KASSERT(cpuid == 0 || cpuid == 1,
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("platform_ipi_send: invalid cpuid %d", cpuid));
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sb_set_mailbox(cpuid, 1ULL);
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}
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void
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platform_ipi_clear(void)
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{
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int cpuid;
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cpuid = PCPU_GET(cpuid);
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sb_clear_mailbox(cpuid, 1ULL);
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}
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int
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platform_ipi_intrnum(void)
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{
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return (4);
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}
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struct cpu_group *
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platform_smp_topo(void)
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{
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return (smp_topo_none());
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}
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void
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platform_init_ap(int cpuid)
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{
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int ipi_int_mask, clock_int_mask;
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KASSERT(cpuid == 1, ("AP has an invalid cpu id %d", cpuid));
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/*
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* Make sure that kseg0 is mapped cacheable-coherent
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*/
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kseg0_map_coherent();
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sb_intr_init(cpuid);
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/*
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* Unmask the clock and ipi interrupts.
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*/
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clock_int_mask = hard_int_mask(5);
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ipi_int_mask = hard_int_mask(platform_ipi_intrnum());
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set_intr_mask(ipi_int_mask | clock_int_mask);
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}
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int
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platform_start_ap(int cpuid)
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{
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#ifdef CFE
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int error;
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if ((error = cfe_cpu_start(cpuid, mpentry, 0, 0, 0))) {
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printf("cfe_cpu_start error: %d\n", error);
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return (-1);
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} else {
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return (0);
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}
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#else
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return (-1);
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#endif /* CFE */
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}
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#endif /* SMP */
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static u_int
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sb_get_timecount(struct timecounter *tc)
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{
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return ((u_int)sb_zbbus_cycle_count());
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}
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static void
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sb_timecounter_init(void)
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{
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static struct timecounter sb_timecounter = {
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sb_get_timecount,
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NULL,
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~0u,
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0,
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"sibyte_zbbus_counter",
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2000
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};
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/*
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* The ZBbus cycle counter runs at half the cpu frequency.
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*/
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sb_timecounter.tc_frequency = sb_cpu_speed() / 2;
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platform_timecounter = &sb_timecounter;
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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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/*
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* Make sure that kseg0 is mapped cacheable-coherent
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*/
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kseg0_map_coherent();
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/* clear the BSS and SBSS segments */
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memset(&edata, 0, (vm_offset_t)&end - (vm_offset_t)&edata);
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mips_postboot_fixup();
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sb_intr_init(0);
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sb_timecounter_init();
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/* Initialize pcpu stuff */
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mips_pcpu0_init();
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#ifdef CFE
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/*
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* Initialize CFE firmware trampolines before
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* we initialize the low-level console.
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*
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* CFE passes the following values in registers:
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* a0: firmware handle
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* a2: firmware entry point
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* a3: entry point seal
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*/
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if (a3 == CFE_EPTSEAL)
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cfe_init(a0, a2);
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#endif
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cninit();
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mips_init();
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mips_timer_init_params(sb_cpu_speed(), 0);
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}
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