/* * * Common boot and setup code. * * Copyright (C) 2001 PPC64 Team, IBM Corp * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "setup.h" #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else #define DBG(fmt...) #endif int have_of = 1; int boot_cpuid = 0; dev_t boot_dev; u64 ppc64_pft_size; /* Pick defaults since we might want to patch instructions * before we've read this from the device tree. */ struct ppc64_caches ppc64_caches = { .dline_size = 0x80, .log_dline_size = 7, .iline_size = 0x80, .log_iline_size = 7 }; EXPORT_SYMBOL_GPL(ppc64_caches); /* * These are used in binfmt_elf.c to put aux entries on the stack * for each elf executable being started. */ int dcache_bsize; int icache_bsize; int ucache_bsize; #ifdef CONFIG_MAGIC_SYSRQ unsigned long SYSRQ_KEY; #endif /* CONFIG_MAGIC_SYSRQ */ #ifdef CONFIG_SMP static int smt_enabled_cmdline; /* Look for ibm,smt-enabled OF option */ static void check_smt_enabled(void) { struct device_node *dn; char *smt_option; /* Allow the command line to overrule the OF option */ if (smt_enabled_cmdline) return; dn = of_find_node_by_path("/options"); if (dn) { smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL); if (smt_option) { if (!strcmp(smt_option, "on")) smt_enabled_at_boot = 1; else if (!strcmp(smt_option, "off")) smt_enabled_at_boot = 0; } } } /* Look for smt-enabled= cmdline option */ static int __init early_smt_enabled(char *p) { smt_enabled_cmdline = 1; if (!p) return 0; if (!strcmp(p, "on") || !strcmp(p, "1")) smt_enabled_at_boot = 1; else if (!strcmp(p, "off") || !strcmp(p, "0")) smt_enabled_at_boot = 0; return 0; } early_param("smt-enabled", early_smt_enabled); #else #define check_smt_enabled() #endif /* CONFIG_SMP */ /* Put the paca pointer into r13 and SPRG3 */ void __init setup_paca(int cpu) { local_paca = &paca[cpu]; mtspr(SPRN_SPRG3, local_paca); } /* * Early initialization entry point. This is called by head.S * with MMU translation disabled. We rely on the "feature" of * the CPU that ignores the top 2 bits of the address in real * mode so we can access kernel globals normally provided we * only toy with things in the RMO region. From here, we do * some early parsing of the device-tree to setup out LMB * data structures, and allocate & initialize the hash table * and segment tables so we can start running with translation * enabled. * * It is this function which will call the probe() callback of * the various platform types and copy the matching one to the * global ppc_md structure. Your platform can eventually do * some very early initializations from the probe() routine, but * this is not recommended, be very careful as, for example, the * device-tree is not accessible via normal means at this point. */ void __init early_setup(unsigned long dt_ptr) { /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ setup_paca(0); /* Enable early debugging if any specified (see udbg.h) */ udbg_early_init(); DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); /* * Do early initializations using the flattened device * tree, like retreiving the physical memory map or * calculating/retreiving the hash table size */ early_init_devtree(__va(dt_ptr)); /* Now we know the logical id of our boot cpu, setup the paca. */ setup_paca(boot_cpuid); /* Fix up paca fields required for the boot cpu */ get_paca()->cpu_start = 1; get_paca()->stab_real = __pa((u64)&initial_stab); get_paca()->stab_addr = (u64)&initial_stab; /* Probe the machine type */ probe_machine(); setup_kdump_trampoline(); DBG("Found, Initializing memory management...\n"); /* * Initialize the MMU Hash table and create the linear mapping * of memory. Has to be done before stab/slb initialization as * this is currently where the page size encoding is obtained */ htab_initialize(); /* * Initialize stab / SLB management except on iSeries */ if (cpu_has_feature(CPU_FTR_SLB)) slb_initialize(); else if (!firmware_has_feature(FW_FEATURE_ISERIES)) stab_initialize(get_paca()->stab_real); DBG(" <- early_setup()\n"); } #ifdef CONFIG_SMP void early_setup_secondary(void) { struct paca_struct *lpaca = get_paca(); /* Mark enabled in PACA */ lpaca->proc_enabled = 0; /* Initialize hash table for that CPU */ htab_initialize_secondary(); /* Initialize STAB/SLB. We use a virtual address as it works * in real mode on pSeries and we want a virutal address on * iSeries anyway */ if (cpu_has_feature(CPU_FTR_SLB)) slb_initialize(); else stab_initialize(lpaca->stab_addr); } #endif /* CONFIG_SMP */ #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) void smp_release_cpus(void) { extern unsigned long __secondary_hold_spinloop; unsigned long *ptr; DBG(" -> smp_release_cpus()\n"); /* All secondary cpus are spinning on a common spinloop, release them * all now so they can start to spin on their individual paca * spinloops. For non SMP kernels, the secondary cpus never get out * of the common spinloop. * This is useless but harmless on iSeries, secondaries are already * waiting on their paca spinloops. */ ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop - PHYSICAL_START); *ptr = 1; mb(); DBG(" <- smp_release_cpus()\n"); } #endif /* CONFIG_SMP || CONFIG_KEXEC */ /* * Initialize some remaining members of the ppc64_caches and systemcfg * structures * (at least until we get rid of them completely). This is mostly some * cache informations about the CPU that will be used by cache flush * routines and/or provided to userland */ static void __init initialize_cache_info(void) { struct device_node *np; unsigned long num_cpus = 0; DBG(" -> initialize_cache_info()\n"); for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { num_cpus += 1; /* We're assuming *all* of the CPUs have the same * d-cache and i-cache sizes... -Peter */ if ( num_cpus == 1 ) { u32 *sizep, *lsizep; u32 size, lsize; const char *dc, *ic; /* Then read cache informations */ if (machine_is(powermac)) { dc = "d-cache-block-size"; ic = "i-cache-block-size"; } else { dc = "d-cache-line-size"; ic = "i-cache-line-size"; } size = 0; lsize = cur_cpu_spec->dcache_bsize; sizep = (u32 *)get_property(np, "d-cache-size", NULL); if (sizep != NULL) size = *sizep; lsizep = (u32 *) get_property(np, dc, NULL); if (lsizep != NULL) lsize = *lsizep; if (sizep == 0 || lsizep == 0) DBG("Argh, can't find dcache properties ! " "sizep: %p, lsizep: %p\n", sizep, lsizep); ppc64_caches.dsize = size; ppc64_caches.dline_size = lsize; ppc64_caches.log_dline_size = __ilog2(lsize); ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; size = 0; lsize = cur_cpu_spec->icache_bsize; sizep = (u32 *)get_property(np, "i-cache-size", NULL); if (sizep != NULL) size = *sizep; lsizep = (u32 *)get_property(np, ic, NULL); if (lsizep != NULL) lsize = *lsizep; if (sizep == 0 || lsizep == 0) DBG("Argh, can't find icache properties ! " "sizep: %p, lsizep: %p\n", sizep, lsizep); ppc64_caches.isize = size; ppc64_caches.iline_size = lsize; ppc64_caches.log_iline_size = __ilog2(lsize); ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; } } DBG(" <- initialize_cache_info()\n"); } /* * Do some initial setup of the system. The parameters are those which * were passed in from the bootloader. */ void __init setup_system(void) { DBG(" -> setup_system()\n"); /* * Unflatten the device-tree passed by prom_init or kexec */ unflatten_device_tree(); /* * Fill the ppc64_caches & systemcfg structures with informations * retrieved from the device-tree. */ initialize_cache_info(); /* * Initialize irq remapping subsystem */ irq_early_init(); #ifdef CONFIG_PPC_RTAS /* * Initialize RTAS if available */ rtas_initialize(); #endif /* CONFIG_PPC_RTAS */ /* * Check if we have an initrd provided via the device-tree */ check_for_initrd(); /* * Do some platform specific early initializations, that includes * setting up the hash table pointers. It also sets up some interrupt-mapping * related options that will be used by finish_device_tree() */ ppc_md.init_early(); /* * We can discover serial ports now since the above did setup the * hash table management for us, thus ioremap works. We do that early * so that further code can be debugged */ find_legacy_serial_ports(); /* * Initialize xmon */ #ifdef CONFIG_XMON_DEFAULT xmon_init(1); #endif /* * Register early console */ register_early_udbg_console(); if (do_early_xmon) debugger(NULL); check_smt_enabled(); smp_setup_cpu_maps(); #ifdef CONFIG_SMP /* Release secondary cpus out of their spinloops at 0x60 now that * we can map physical -> logical CPU ids */ smp_release_cpus(); #endif printk("Starting Linux PPC64 %s\n", system_utsname.version); printk("-----------------------------------------------------\n"); printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size()); printk("ppc64_caches.dcache_line_size = 0x%x\n", ppc64_caches.dline_size); printk("ppc64_caches.icache_line_size = 0x%x\n", ppc64_caches.iline_size); printk("htab_address = 0x%p\n", htab_address); printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); #if PHYSICAL_START > 0 printk("physical_start = 0x%x\n", PHYSICAL_START); #endif printk("-----------------------------------------------------\n"); DBG(" <- setup_system()\n"); } #ifdef CONFIG_IRQSTACKS static void __init irqstack_early_init(void) { unsigned int i; /* * interrupt stacks must be under 256MB, we cannot afford to take * SLB misses on them. */ for_each_possible_cpu(i) { softirq_ctx[i] = (struct thread_info *) __va(lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, 0x10000000)); hardirq_ctx[i] = (struct thread_info *) __va(lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, 0x10000000)); } } #else #define irqstack_early_init() #endif /* * Stack space used when we detect a bad kernel stack pointer, and * early in SMP boots before relocation is enabled. */ static void __init emergency_stack_init(void) { unsigned long limit; unsigned int i; /* * Emergency stacks must be under 256MB, we cannot afford to take * SLB misses on them. The ABI also requires them to be 128-byte * aligned. * * Since we use these as temporary stacks during secondary CPU * bringup, we need to get at them in real mode. This means they * must also be within the RMO region. */ limit = min(0x10000000UL, lmb.rmo_size); for_each_possible_cpu(i) paca[i].emergency_sp = __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; } /* * Called into from start_kernel, after lock_kernel has been called. * Initializes bootmem, which is unsed to manage page allocation until * mem_init is called. */ void __init setup_arch(char **cmdline_p) { ppc64_boot_msg(0x12, "Setup Arch"); *cmdline_p = cmd_line; /* * Set cache line size based on type of cpu as a default. * Systems with OF can look in the properties on the cpu node(s) * for a possibly more accurate value. */ dcache_bsize = ppc64_caches.dline_size; icache_bsize = ppc64_caches.iline_size; /* reboot on panic */ panic_timeout = 180; if (ppc_md.panic) setup_panic(); init_mm.start_code = PAGE_OFFSET; init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; init_mm.brk = klimit; irqstack_early_init(); emergency_stack_init(); stabs_alloc(); /* set up the bootmem stuff with available memory */ do_init_bootmem(); sparse_init(); #ifdef CONFIG_DUMMY_CONSOLE conswitchp = &dummy_con; #endif ppc_md.setup_arch(); paging_init(); ppc64_boot_msg(0x15, "Setup Done"); } /* ToDo: do something useful if ppc_md is not yet setup. */ #define PPC64_LINUX_FUNCTION 0x0f000000 #define PPC64_IPL_MESSAGE 0xc0000000 #define PPC64_TERM_MESSAGE 0xb0000000 static void ppc64_do_msg(unsigned int src, const char *msg) { if (ppc_md.progress) { char buf[128]; sprintf(buf, "%08X\n", src); ppc_md.progress(buf, 0); snprintf(buf, 128, "%s", msg); ppc_md.progress(buf, 0); } } /* 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