599 строки
15 KiB
C
599 строки
15 KiB
C
/*
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*
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* Common boot and setup code.
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*
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* Copyright (C) 2001 PPC64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#undef DEBUG
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/ide.h>
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#include <linux/seq_file.h>
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#include <linux/ioport.h>
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#include <linux/console.h>
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#include <linux/utsname.h>
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#include <linux/tty.h>
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#include <linux/root_dev.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/unistd.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/bootmem.h>
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#include <asm/io.h>
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#include <asm/kdump.h>
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#include <asm/prom.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/smp.h>
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#include <asm/elf.h>
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#include <asm/machdep.h>
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#include <asm/paca.h>
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#include <asm/time.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/btext.h>
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#include <asm/nvram.h>
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#include <asm/setup.h>
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#include <asm/system.h>
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#include <asm/rtas.h>
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#include <asm/iommu.h>
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#include <asm/serial.h>
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#include <asm/cache.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/lmb.h>
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#include <asm/firmware.h>
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#include <asm/xmon.h>
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#include <asm/udbg.h>
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#include <asm/kexec.h>
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#include "setup.h"
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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int have_of = 1;
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int boot_cpuid = 0;
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dev_t boot_dev;
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u64 ppc64_pft_size;
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/* Pick defaults since we might want to patch instructions
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* before we've read this from the device tree.
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*/
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struct ppc64_caches ppc64_caches = {
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.dline_size = 0x40,
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.log_dline_size = 6,
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.iline_size = 0x40,
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.log_iline_size = 6
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};
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EXPORT_SYMBOL_GPL(ppc64_caches);
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/*
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* These are used in binfmt_elf.c to put aux entries on the stack
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* for each elf executable being started.
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*/
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int dcache_bsize;
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int icache_bsize;
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int ucache_bsize;
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#ifdef CONFIG_MAGIC_SYSRQ
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unsigned long SYSRQ_KEY;
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#endif /* CONFIG_MAGIC_SYSRQ */
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#ifdef CONFIG_SMP
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static int smt_enabled_cmdline;
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/* Look for ibm,smt-enabled OF option */
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static void check_smt_enabled(void)
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{
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struct device_node *dn;
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const char *smt_option;
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/* Allow the command line to overrule the OF option */
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if (smt_enabled_cmdline)
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return;
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dn = of_find_node_by_path("/options");
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if (dn) {
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smt_option = get_property(dn, "ibm,smt-enabled", NULL);
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if (smt_option) {
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if (!strcmp(smt_option, "on"))
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smt_enabled_at_boot = 1;
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else if (!strcmp(smt_option, "off"))
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smt_enabled_at_boot = 0;
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}
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}
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}
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/* Look for smt-enabled= cmdline option */
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static int __init early_smt_enabled(char *p)
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{
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smt_enabled_cmdline = 1;
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if (!p)
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return 0;
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if (!strcmp(p, "on") || !strcmp(p, "1"))
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smt_enabled_at_boot = 1;
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else if (!strcmp(p, "off") || !strcmp(p, "0"))
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smt_enabled_at_boot = 0;
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return 0;
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}
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early_param("smt-enabled", early_smt_enabled);
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#else
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#define check_smt_enabled()
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#endif /* CONFIG_SMP */
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/* Put the paca pointer into r13 and SPRG3 */
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void __init setup_paca(int cpu)
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{
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local_paca = &paca[cpu];
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mtspr(SPRN_SPRG3, local_paca);
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}
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/*
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* Early initialization entry point. This is called by head.S
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* with MMU translation disabled. We rely on the "feature" of
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* the CPU that ignores the top 2 bits of the address in real
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* mode so we can access kernel globals normally provided we
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* only toy with things in the RMO region. From here, we do
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* some early parsing of the device-tree to setup out LMB
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* data structures, and allocate & initialize the hash table
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* and segment tables so we can start running with translation
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* enabled.
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*
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* It is this function which will call the probe() callback of
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* the various platform types and copy the matching one to the
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* global ppc_md structure. Your platform can eventually do
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* some very early initializations from the probe() routine, but
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* this is not recommended, be very careful as, for example, the
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* device-tree is not accessible via normal means at this point.
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*/
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void __init early_setup(unsigned long dt_ptr)
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{
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/* Assume we're on cpu 0 for now. Don't write to the paca yet! */
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setup_paca(0);
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/* Enable early debugging if any specified (see udbg.h) */
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udbg_early_init();
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DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
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/*
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* Do early initializations using the flattened device
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* tree, like retreiving the physical memory map or
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* calculating/retreiving the hash table size
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*/
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early_init_devtree(__va(dt_ptr));
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/* Now we know the logical id of our boot cpu, setup the paca. */
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setup_paca(boot_cpuid);
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/* Fix up paca fields required for the boot cpu */
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get_paca()->cpu_start = 1;
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get_paca()->stab_real = __pa((u64)&initial_stab);
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get_paca()->stab_addr = (u64)&initial_stab;
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/* Probe the machine type */
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probe_machine();
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setup_kdump_trampoline();
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DBG("Found, Initializing memory management...\n");
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/*
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* Initialize the MMU Hash table and create the linear mapping
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* of memory. Has to be done before stab/slb initialization as
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* this is currently where the page size encoding is obtained
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*/
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htab_initialize();
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/*
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* Initialize stab / SLB management except on iSeries
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*/
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if (cpu_has_feature(CPU_FTR_SLB))
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slb_initialize();
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else if (!firmware_has_feature(FW_FEATURE_ISERIES))
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stab_initialize(get_paca()->stab_real);
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DBG(" <- early_setup()\n");
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}
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#ifdef CONFIG_SMP
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void early_setup_secondary(void)
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{
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struct paca_struct *lpaca = get_paca();
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/* Mark enabled in PACA */
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lpaca->proc_enabled = 0;
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/* Initialize hash table for that CPU */
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htab_initialize_secondary();
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/* Initialize STAB/SLB. We use a virtual address as it works
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* in real mode on pSeries and we want a virutal address on
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* iSeries anyway
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*/
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if (cpu_has_feature(CPU_FTR_SLB))
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slb_initialize();
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else
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stab_initialize(lpaca->stab_addr);
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}
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#endif /* CONFIG_SMP */
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#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
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void smp_release_cpus(void)
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{
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extern unsigned long __secondary_hold_spinloop;
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unsigned long *ptr;
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DBG(" -> smp_release_cpus()\n");
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/* All secondary cpus are spinning on a common spinloop, release them
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* all now so they can start to spin on their individual paca
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* spinloops. For non SMP kernels, the secondary cpus never get out
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* of the common spinloop.
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* This is useless but harmless on iSeries, secondaries are already
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* waiting on their paca spinloops. */
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ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
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- PHYSICAL_START);
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*ptr = 1;
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mb();
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DBG(" <- smp_release_cpus()\n");
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}
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#endif /* CONFIG_SMP || CONFIG_KEXEC */
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/*
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* Initialize some remaining members of the ppc64_caches and systemcfg
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* structures
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* (at least until we get rid of them completely). This is mostly some
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* cache informations about the CPU that will be used by cache flush
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* routines and/or provided to userland
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*/
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static void __init initialize_cache_info(void)
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{
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struct device_node *np;
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unsigned long num_cpus = 0;
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DBG(" -> initialize_cache_info()\n");
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for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
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num_cpus += 1;
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/* We're assuming *all* of the CPUs have the same
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* d-cache and i-cache sizes... -Peter
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*/
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if ( num_cpus == 1 ) {
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const u32 *sizep, *lsizep;
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u32 size, lsize;
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const char *dc, *ic;
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/* Then read cache informations */
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if (machine_is(powermac)) {
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dc = "d-cache-block-size";
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ic = "i-cache-block-size";
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} else {
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dc = "d-cache-line-size";
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ic = "i-cache-line-size";
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}
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size = 0;
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lsize = cur_cpu_spec->dcache_bsize;
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sizep = get_property(np, "d-cache-size", NULL);
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if (sizep != NULL)
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size = *sizep;
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lsizep = get_property(np, dc, NULL);
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if (lsizep != NULL)
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lsize = *lsizep;
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if (sizep == 0 || lsizep == 0)
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DBG("Argh, can't find dcache properties ! "
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"sizep: %p, lsizep: %p\n", sizep, lsizep);
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ppc64_caches.dsize = size;
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ppc64_caches.dline_size = lsize;
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ppc64_caches.log_dline_size = __ilog2(lsize);
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ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
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size = 0;
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lsize = cur_cpu_spec->icache_bsize;
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sizep = get_property(np, "i-cache-size", NULL);
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if (sizep != NULL)
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size = *sizep;
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lsizep = get_property(np, ic, NULL);
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if (lsizep != NULL)
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lsize = *lsizep;
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if (sizep == 0 || lsizep == 0)
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DBG("Argh, can't find icache properties ! "
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"sizep: %p, lsizep: %p\n", sizep, lsizep);
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ppc64_caches.isize = size;
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ppc64_caches.iline_size = lsize;
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ppc64_caches.log_iline_size = __ilog2(lsize);
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ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
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}
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}
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DBG(" <- initialize_cache_info()\n");
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}
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/*
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* Do some initial setup of the system. The parameters are those which
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* were passed in from the bootloader.
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*/
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void __init setup_system(void)
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{
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DBG(" -> setup_system()\n");
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/*
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* Unflatten the device-tree passed by prom_init or kexec
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*/
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unflatten_device_tree();
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/*
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* Fill the ppc64_caches & systemcfg structures with informations
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* retrieved from the device-tree.
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*/
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initialize_cache_info();
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/*
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* Initialize irq remapping subsystem
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*/
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irq_early_init();
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#ifdef CONFIG_PPC_RTAS
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/*
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* Initialize RTAS if available
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*/
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rtas_initialize();
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#endif /* CONFIG_PPC_RTAS */
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/*
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* Check if we have an initrd provided via the device-tree
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*/
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check_for_initrd();
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/*
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* Do some platform specific early initializations, that includes
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* setting up the hash table pointers. It also sets up some interrupt-mapping
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* related options that will be used by finish_device_tree()
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*/
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ppc_md.init_early();
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/*
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* We can discover serial ports now since the above did setup the
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* hash table management for us, thus ioremap works. We do that early
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* so that further code can be debugged
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*/
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find_legacy_serial_ports();
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/*
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* Initialize xmon
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*/
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#ifdef CONFIG_XMON_DEFAULT
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xmon_init(1);
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#endif
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/*
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* Register early console
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*/
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register_early_udbg_console();
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if (do_early_xmon)
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debugger(NULL);
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check_smt_enabled();
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smp_setup_cpu_maps();
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#ifdef CONFIG_SMP
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/* Release secondary cpus out of their spinloops at 0x60 now that
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* we can map physical -> logical CPU ids
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*/
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smp_release_cpus();
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#endif
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printk("Starting Linux PPC64 %s\n", system_utsname.version);
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printk("-----------------------------------------------------\n");
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printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
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printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
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printk("ppc64_caches.dcache_line_size = 0x%x\n",
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ppc64_caches.dline_size);
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printk("ppc64_caches.icache_line_size = 0x%x\n",
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ppc64_caches.iline_size);
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printk("htab_address = 0x%p\n", htab_address);
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printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
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#if PHYSICAL_START > 0
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printk("physical_start = 0x%x\n", PHYSICAL_START);
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#endif
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printk("-----------------------------------------------------\n");
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DBG(" <- setup_system()\n");
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}
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#ifdef CONFIG_IRQSTACKS
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static void __init irqstack_early_init(void)
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{
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unsigned int i;
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/*
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* interrupt stacks must be under 256MB, we cannot afford to take
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* SLB misses on them.
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*/
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for_each_possible_cpu(i) {
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softirq_ctx[i] = (struct thread_info *)
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__va(lmb_alloc_base(THREAD_SIZE,
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THREAD_SIZE, 0x10000000));
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hardirq_ctx[i] = (struct thread_info *)
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__va(lmb_alloc_base(THREAD_SIZE,
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THREAD_SIZE, 0x10000000));
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}
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}
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#else
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#define irqstack_early_init()
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#endif
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/*
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* Stack space used when we detect a bad kernel stack pointer, and
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* early in SMP boots before relocation is enabled.
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*/
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static void __init emergency_stack_init(void)
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{
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unsigned long limit;
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unsigned int i;
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/*
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* Emergency stacks must be under 256MB, we cannot afford to take
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* SLB misses on them. The ABI also requires them to be 128-byte
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* aligned.
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*
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* Since we use these as temporary stacks during secondary CPU
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* bringup, we need to get at them in real mode. This means they
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* must also be within the RMO region.
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*/
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limit = min(0x10000000UL, lmb.rmo_size);
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for_each_possible_cpu(i)
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paca[i].emergency_sp =
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__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
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}
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/*
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* Called into from start_kernel, after lock_kernel has been called.
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* Initializes bootmem, which is unsed to manage page allocation until
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* mem_init is called.
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*/
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void __init setup_arch(char **cmdline_p)
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{
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ppc64_boot_msg(0x12, "Setup Arch");
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*cmdline_p = cmd_line;
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/*
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* Set cache line size based on type of cpu as a default.
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* Systems with OF can look in the properties on the cpu node(s)
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* for a possibly more accurate value.
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*/
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dcache_bsize = ppc64_caches.dline_size;
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icache_bsize = ppc64_caches.iline_size;
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/* reboot on panic */
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panic_timeout = 180;
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if (ppc_md.panic)
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setup_panic();
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init_mm.start_code = PAGE_OFFSET;
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init_mm.end_code = (unsigned long) _etext;
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init_mm.end_data = (unsigned long) _edata;
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init_mm.brk = klimit;
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irqstack_early_init();
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emergency_stack_init();
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stabs_alloc();
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/* set up the bootmem stuff with available memory */
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do_init_bootmem();
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sparse_init();
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#ifdef CONFIG_DUMMY_CONSOLE
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conswitchp = &dummy_con;
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#endif
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ppc_md.setup_arch();
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paging_init();
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ppc64_boot_msg(0x15, "Setup Done");
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}
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/* ToDo: do something useful if ppc_md is not yet setup. */
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|
#define PPC64_LINUX_FUNCTION 0x0f000000
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|
#define PPC64_IPL_MESSAGE 0xc0000000
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|
#define PPC64_TERM_MESSAGE 0xb0000000
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|
|
|
static void ppc64_do_msg(unsigned int src, const char *msg)
|
|
{
|
|
if (ppc_md.progress) {
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|
char buf[128];
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|
|
|
sprintf(buf, "%08X\n", src);
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|
ppc_md.progress(buf, 0);
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|
snprintf(buf, 128, "%s", msg);
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|
ppc_md.progress(buf, 0);
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|
}
|
|
}
|
|
|
|
/* Print a boot progress message. */
|
|
void ppc64_boot_msg(unsigned int src, const char *msg)
|
|
{
|
|
ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
|
|
printk("[boot]%04x %s\n", src, msg);
|
|
}
|
|
|
|
/* Print a termination message (print only -- does not stop the kernel) */
|
|
void ppc64_terminate_msg(unsigned int src, const char *msg)
|
|
{
|
|
ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
|
|
printk("[terminate]%04x %s\n", src, msg);
|
|
}
|
|
|
|
void cpu_die(void)
|
|
{
|
|
if (ppc_md.cpu_die)
|
|
ppc_md.cpu_die();
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
void __init setup_per_cpu_areas(void)
|
|
{
|
|
int i;
|
|
unsigned long size;
|
|
char *ptr;
|
|
|
|
/* Copy section for each CPU (we discard the original) */
|
|
size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
|
|
#ifdef CONFIG_MODULES
|
|
if (size < PERCPU_ENOUGH_ROOM)
|
|
size = PERCPU_ENOUGH_ROOM;
|
|
#endif
|
|
|
|
for_each_possible_cpu(i) {
|
|
ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size);
|
|
if (!ptr)
|
|
panic("Cannot allocate cpu data for CPU %d\n", i);
|
|
|
|
paca[i].data_offset = ptr - __per_cpu_start;
|
|
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
|
|
}
|
|
}
|
|
#endif
|