/* * * 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 <linux/config.h>#include <linux/module.h>#include <linux/string.h>#include <linux/sched.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/reboot.h>#include <linux/delay.h>#include <linux/initrd.h>#include <linux/ide.h>#include <linux/seq_file.h>#include <linux/ioport.h>#include <linux/console.h>#include <linux/version.h>#include <linux/tty.h>#include <linux/root_dev.h>#include <linux/notifier.h>#include <linux/cpu.h>#include <linux/unistd.h>#include <linux/serial.h>#include <linux/serial_8250.h>#include <asm/io.h>#include <asm/prom.h>#include <asm/processor.h>#include <asm/pgtable.h>#include <asm/bootinfo.h>#include <asm/smp.h>#include <asm/elf.h>#include <asm/machdep.h>#include <asm/paca.h>#include <asm/ppcdebug.h>#include <asm/time.h>#include <asm/cputable.h>#include <asm/sections.h>#include <asm/btext.h>#include <asm/nvram.h>#include <asm/setup.h>#include <asm/system.h>#include <asm/rtas.h>#include <asm/iommu.h>#include <asm/serial.h>#include <asm/cache.h>#include <asm/page.h>#include <asm/mmu.h>#include <asm/lmb.h>#include <asm/iSeries/ItLpNaca.h> #ifdef DEBUG#define DBG(fmt...) udbg_printf(fmt)#else#define DBG(fmt...)#endif /* * Here are some early debugging facilities. You can enable one * but your kernel will not boot on anything else if you do so */ /* This one is for use on LPAR machines that support an HVC console * on vterm 0 */extern void udbg_init_debug_lpar(void);/* This one is for use on Apple G5 machines */extern void udbg_init_pmac_realmode(void);/* That's RTAS panel debug */extern void call_rtas_display_status_delay(unsigned char c);/* Here's maple real mode debug */extern void udbg_init_maple_realmode(void); #define EARLY_DEBUG_INIT() do {} while(0) #if 0#define EARLY_DEBUG_INIT() udbg_init_debug_lpar()#define EARLY_DEBUG_INIT() udbg_init_maple_realmode()#define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()#define EARLY_DEBUG_INIT() \ do { ppc_md.udbg_putc = call_rtas_display_status_delay; } while(0)#endif /* extern void *stab; */extern unsigned long klimit; extern void mm_init_ppc64(void);extern void stab_initialize(unsigned long stab);extern void htab_initialize(void);extern void early_init_devtree(void *flat_dt);extern void unflatten_device_tree(void); extern void smp_release_cpus(void); int have_of = 1;int boot_cpuid = 0;int boot_cpuid_phys = 0;dev_t boot_dev;u64 ppc64_pft_size;u64 ppc64_debug_switch; struct ppc64_caches ppc64_caches;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; /* The main machine-dep calls structure */struct machdep_calls ppc_md;EXPORT_SYMBOL(ppc_md); #ifdef CONFIG_MAGIC_SYSRQunsigned long SYSRQ_KEY;#endif /* CONFIG_MAGIC_SYSRQ */ static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);static struct notifier_block ppc64_panic_block = { .notifier_call = ppc64_panic_event, .priority = INT_MIN /* may not return; must be done last */}; /* * Perhaps we can put the pmac screen_info[] here * on pmac as well so we don't need the ifdef's. * Until we get multiple-console support in here * that is. -- Cort * Maybe tie it to serial consoles, since this is really what * these processors use on existing boards. -- Dan */ struct screen_info screen_info = { .orig_x = 0, .orig_y = 25, .orig_video_cols = 80, .orig_video_lines = 25, .orig_video_isVGA = 1, .orig_video_points = 16}; /* * Initialize the PPCDBG state. Called before relocation has been enabled. */void __init ppcdbg_initialize(void){ ppc64_debug_switch = PPC_DEBUG_DEFAULT; /* | PPCDBG_BUSWALK | */ /* PPCDBG_PHBINIT | PPCDBG_MM | PPCDBG_MMINIT | PPCDBG_TCEINIT | PPCDBG_TCE */;} /* * Early boot console based on udbg */static struct console udbg_console = { .name = "udbg", .write = udbg_console_write, .flags = CON_PRINTBUFFER, .index = -1,};static int early_console_initialized; void __init disable_early_printk(void){ if (!early_console_initialized) return; unregister_console(&udbg_console); early_console_initialized = 0;} #if defined(CONFIG_PPC_MULTIPLATFORM) && defined(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); /** * setup_cpu_maps - initialize the following cpu maps: * cpu_possible_map * cpu_present_map * cpu_sibling_map * * Having the possible map set up early allows us to restrict allocations * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. * * We do not initialize the online map here; cpus set their own bits in * cpu_online_map as they come up. * * This function is valid only for Open Firmware systems. finish_device_tree * must be called before using this. * * While we're here, we may as well set the "physical" cpu ids in the paca. */static void __init setup_cpu_maps(void){ struct device_node *dn = NULL; int cpu = 0; int swap_cpuid = 0; check_smt_enabled(); while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { u32 *intserv; int j, len = sizeof(u32), nthreads; intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s", &len); if (!intserv) intserv = (u32 *)get_property(dn, "reg", NULL); nthreads = len / sizeof(u32); for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { cpu_set(cpu, cpu_present_map); set_hard_smp_processor_id(cpu, intserv[j]); if (intserv[j] == boot_cpuid_phys) swap_cpuid = cpu; cpu_set(cpu, cpu_possible_map); cpu++; } } /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that * boot cpu is logical 0. */ if (boot_cpuid_phys != get_hard_smp_processor_id(0)) { u32 tmp; tmp = get_hard_smp_processor_id(0); set_hard_smp_processor_id(0, boot_cpuid_phys); set_hard_smp_processor_id(swap_cpuid, tmp); } /* * On pSeries LPAR, we need to know how many cpus * could possibly be added to this partition. */ if (systemcfg->platform == PLATFORM_PSERIES_LPAR && (dn = of_find_node_by_path("/rtas"))) { int num_addr_cell, num_size_cell, maxcpus; unsigned int *ireg; num_addr_cell = prom_n_addr_cells(dn); num_size_cell = prom_n_size_cells(dn); ireg = (unsigned int *) get_property(dn, "ibm,lrdr-capacity", NULL); if (!ireg) goto out; maxcpus = ireg[num_addr_cell + num_size_cell]; /* Double maxcpus for processors which have SMT capability */ if (cpu_has_feature(CPU_FTR_SMT)) maxcpus *= 2; if (maxcpus > NR_CPUS) { printk(KERN_WARNING "Partition configured for %d cpus, " "operating system maximum is %d.\n", maxcpus, NR_CPUS); maxcpus = NR_CPUS; } else printk(KERN_INFO "Partition configured for %d cpus.\n", maxcpus); for (cpu = 0; cpu < maxcpus; cpu++) cpu_set(cpu, cpu_possible_map); out: of_node_put(dn); } /* * Do the sibling map; assume only two threads per processor. */ for_each_cpu(cpu) { cpu_set(cpu, cpu_sibling_map[cpu]); if (cpu_has_feature(CPU_FTR_SMT)) cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]); } systemcfg->processorCount = num_present_cpus();}#endif /* defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP) */ #ifdef CONFIG_PPC_MULTIPLATFORM extern struct machdep_calls pSeries_md;extern struct machdep_calls pmac_md;extern struct machdep_calls maple_md;extern struct machdep_calls bpa_md; /* Ultimately, stuff them in an elf section like initcalls... */static struct machdep_calls __initdata *machines[] = {#ifdef CONFIG_PPC_PSERIES &pSeries_md,#endif /* CONFIG_PPC_PSERIES */#ifdef CONFIG_PPC_PMAC &pmac_md,#endif /* CONFIG_PPC_PMAC */#ifdef CONFIG_PPC_MAPLE &maple_md,#endif /* CONFIG_PPC_MAPLE */#ifdef CONFIG_PPC_BPA &bpa_md,#endif NULL}; /* * 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){ struct paca_struct *lpaca = get_paca(); static struct machdep_calls **mach; /* * Enable early debugging if any specified (see top of * this file) */ EARLY_DEBUG_INIT(); DBG(" -> early_setup()\n"); /* * Fill the default DBG level (do we want to keep * that old mecanism around forever ?) */ ppcdbg_initialize(); /* * 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)); /* * Iterate all ppc_md structures until we find the proper * one for the current machine type */ DBG("Probing machine type for platform %x...\n", systemcfg->platform); for (mach = machines; *mach; mach++) { if ((*mach)->probe(systemcfg->platform)) break; } /* What can we do if we didn't find ? */ if (*mach == NULL) { DBG("No suitable machine found !\n"); for (;;); } ppc_md = **mach; /* our udbg callbacks got overriden by the above, let's put them * back in. Ultimately, I want those things to be split from the * main ppc_md */ EARLY_DEBUG_INIT(); DBG("Found, Initializing memory management...\n"); /* * Initialize stab / SLB management */ stab_initialize(lpaca->stab_real); /* * Initialize the MMU Hash table and create the linear mapping * of memory */ htab_initialize(); DBG(" <- early_setup()\n");} /* * 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 (systemcfg->platform == PLATFORM_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); systemcfg->dcache_size = ppc64_caches.dsize = size; systemcfg->dcache_line_size = ppc64_caches.dline_size = lsize; ppc64_caches.log_dline_size = __ilog2(lsize);Lines 1–500 of 1362. Load more
/* * * 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 <linux/config.h> #include <linux/module.h> #include <linux/string.h> #include <linux/sched.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/reboot.h> #include <linux/delay.h> #include <linux/initrd.h> #include <linux/ide.h> #include <linux/seq_file.h> #include <linux/ioport.h> #include <linux/console.h> #include <linux/version.h> #include <linux/tty.h> #include <linux/root_dev.h> #include <linux/notifier.h> #include <linux/cpu.h> #include <linux/unistd.h> #include <linux/serial.h> #include <linux/serial_8250.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/processor.h> #include <asm/pgtable.h> #include <asm/bootinfo.h> #include <asm/smp.h> #include <asm/elf.h> #include <asm/machdep.h> #include <asm/paca.h> #include <asm/ppcdebug.h> #include <asm/time.h> #include <asm/cputable.h> #include <asm/sections.h> #include <asm/btext.h> #include <asm/nvram.h> #include <asm/setup.h> #include <asm/system.h> #include <asm/rtas.h> #include <asm/iommu.h> #include <asm/serial.h> #include <asm/cache.h> #include <asm/page.h> #include <asm/mmu.h> #include <asm/lmb.h> #include <asm/iSeries/ItLpNaca.h> #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else #define DBG(fmt...) #endif /* * Here are some early debugging facilities. You can enable one * but your kernel will not boot on anything else if you do so */ /* This one is for use on LPAR machines that support an HVC console * on vterm 0 */ extern void udbg_init_debug_lpar(void); /* This one is for use on Apple G5 machines */ extern void udbg_init_pmac_realmode(void); /* That's RTAS panel debug */ extern void call_rtas_display_status_delay(unsigned char c); /* Here's maple real mode debug */ extern void udbg_init_maple_realmode(void); #define EARLY_DEBUG_INIT() do {} while(0) #if 0 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar() #define EARLY_DEBUG_INIT() udbg_init_maple_realmode() #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode() #define EARLY_DEBUG_INIT() \ do { ppc_md.udbg_putc = call_rtas_display_status_delay; } while(0) #endif /* extern void *stab; */ extern unsigned long klimit; extern void mm_init_ppc64(void); extern void stab_initialize(unsigned long stab); extern void htab_initialize(void); extern void early_init_devtree(void *flat_dt); extern void unflatten_device_tree(void); extern void smp_release_cpus(void); int have_of = 1; int boot_cpuid = 0; int boot_cpuid_phys = 0; dev_t boot_dev; u64 ppc64_pft_size; u64 ppc64_debug_switch; struct ppc64_caches ppc64_caches; 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; /* The main machine-dep calls structure */ struct machdep_calls ppc_md; EXPORT_SYMBOL(ppc_md); #ifdef CONFIG_MAGIC_SYSRQ unsigned long SYSRQ_KEY; #endif /* CONFIG_MAGIC_SYSRQ */ static int ppc64_panic_event(struct notifier_block *, unsigned long, void *); static struct notifier_block ppc64_panic_block = { .notifier_call = ppc64_panic_event, .priority = INT_MIN /* may not return; must be done last */ }; /* * Perhaps we can put the pmac screen_info[] here * on pmac as well so we don't need the ifdef's. * Until we get multiple-console support in here * that is. -- Cort * Maybe tie it to serial consoles, since this is really what * these processors use on existing boards. -- Dan */ struct screen_info screen_info = { .orig_x = 0, .orig_y = 25, .orig_video_cols = 80, .orig_video_lines = 25, .orig_video_isVGA = 1, .orig_video_points = 16 }; /* * Initialize the PPCDBG state. Called before relocation has been enabled. */ void __init ppcdbg_initialize(void) { ppc64_debug_switch = PPC_DEBUG_DEFAULT; /* | PPCDBG_BUSWALK | */ /* PPCDBG_PHBINIT | PPCDBG_MM | PPCDBG_MMINIT | PPCDBG_TCEINIT | PPCDBG_TCE */; } /* * Early boot console based on udbg */ static struct console udbg_console = { .name = "udbg", .write = udbg_console_write, .flags = CON_PRINTBUFFER, .index = -1, }; static int early_console_initialized; void __init disable_early_printk(void) { if (!early_console_initialized) return; unregister_console(&udbg_console); early_console_initialized = 0; } #if defined(CONFIG_PPC_MULTIPLATFORM) && defined(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); /** * setup_cpu_maps - initialize the following cpu maps: * cpu_possible_map * cpu_present_map * cpu_sibling_map * * Having the possible map set up early allows us to restrict allocations * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. * * We do not initialize the online map here; cpus set their own bits in * cpu_online_map as they come up. * * This function is valid only for Open Firmware systems. finish_device_tree * must be called before using this. * * While we're here, we may as well set the "physical" cpu ids in the paca. */ static void __init setup_cpu_maps(void) { struct device_node *dn = NULL; int cpu = 0; int swap_cpuid = 0; check_smt_enabled(); while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { u32 *intserv; int j, len = sizeof(u32), nthreads; intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s", &len); if (!intserv) intserv = (u32 *)get_property(dn, "reg", NULL); nthreads = len / sizeof(u32); for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { cpu_set(cpu, cpu_present_map); set_hard_smp_processor_id(cpu, intserv[j]); if (intserv[j] == boot_cpuid_phys) swap_cpuid = cpu; cpu_set(cpu, cpu_possible_map); cpu++; } } /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that * boot cpu is logical 0. */ if (boot_cpuid_phys != get_hard_smp_processor_id(0)) { u32 tmp; tmp = get_hard_smp_processor_id(0); set_hard_smp_processor_id(0, boot_cpuid_phys); set_hard_smp_processor_id(swap_cpuid, tmp); } /* * On pSeries LPAR, we need to know how many cpus * could possibly be added to this partition. */ if (systemcfg->platform == PLATFORM_PSERIES_LPAR && (dn = of_find_node_by_path("/rtas"))) { int num_addr_cell, num_size_cell, maxcpus; unsigned int *ireg; num_addr_cell = prom_n_addr_cells(dn); num_size_cell = prom_n_size_cells(dn); ireg = (unsigned int *) get_property(dn, "ibm,lrdr-capacity", NULL); if (!ireg) goto out; maxcpus = ireg[num_addr_cell + num_size_cell]; /* Double maxcpus for processors which have SMT capability */ if (cpu_has_feature(CPU_FTR_SMT)) maxcpus *= 2; if (maxcpus > NR_CPUS) { printk(KERN_WARNING "Partition configured for %d cpus, " "operating system maximum is %d.\n", maxcpus, NR_CPUS); maxcpus = NR_CPUS; } else printk(KERN_INFO "Partition configured for %d cpus.\n", maxcpus); for (cpu = 0; cpu < maxcpus; cpu++) cpu_set(cpu, cpu_possible_map); out: of_node_put(dn); } /* * Do the sibling map; assume only two threads per processor. */ for_each_cpu(cpu) { cpu_set(cpu, cpu_sibling_map[cpu]); if (cpu_has_feature(CPU_FTR_SMT)) cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]); } systemcfg->processorCount = num_present_cpus(); } #endif /* defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP) */ #ifdef CONFIG_PPC_MULTIPLATFORM extern struct machdep_calls pSeries_md; extern struct machdep_calls pmac_md; extern struct machdep_calls maple_md; extern struct machdep_calls bpa_md; /* Ultimately, stuff them in an elf section like initcalls... */ static struct machdep_calls __initdata *machines[] = { #ifdef CONFIG_PPC_PSERIES &pSeries_md, #endif /* CONFIG_PPC_PSERIES */ #ifdef CONFIG_PPC_PMAC &pmac_md, #endif /* CONFIG_PPC_PMAC */ #ifdef CONFIG_PPC_MAPLE &maple_md, #endif /* CONFIG_PPC_MAPLE */ #ifdef CONFIG_PPC_BPA &bpa_md, #endif NULL }; /* * 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) { struct paca_struct *lpaca = get_paca(); static struct machdep_calls **mach; /* * Enable early debugging if any specified (see top of * this file) */ EARLY_DEBUG_INIT(); DBG(" -> early_setup()\n"); /* * Fill the default DBG level (do we want to keep * that old mecanism around forever ?) */ ppcdbg_initialize(); /* * 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)); /* * Iterate all ppc_md structures until we find the proper * one for the current machine type */ DBG("Probing machine type for platform %x...\n", systemcfg->platform); for (mach = machines; *mach; mach++) { if ((*mach)->probe(systemcfg->platform)) break; } /* What can we do if we didn't find ? */ if (*mach == NULL) { DBG("No suitable machine found !\n"); for (;;); } ppc_md = **mach; /* our udbg callbacks got overriden by the above, let's put them * back in. Ultimately, I want those things to be split from the * main ppc_md */ EARLY_DEBUG_INIT(); DBG("Found, Initializing memory management...\n"); /* * Initialize stab / SLB management */ stab_initialize(lpaca->stab_real); /* * Initialize the MMU Hash table and create the linear mapping * of memory */ htab_initialize(); DBG(" <- early_setup()\n"); } /* * 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 (systemcfg->platform == PLATFORM_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); systemcfg->dcache_size = ppc64_caches.dsize = size; systemcfg->dcache_line_size = ppc64_caches.dline_size = lsize; ppc64_caches.log_dline_size = __ilog2(lsize);