/* * Common prep/pmac/chrp boot and setup code. */ #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/tty.h> #include <linux/bootmem.h> #include <linux/seq_file.h> #include <linux/root_dev.h> #include <linux/cpu.h> #include <linux/console.h> #include <asm/residual.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/processor.h> #include <asm/pgtable.h> #include <asm/setup.h> #include <asm/amigappc.h> #include <asm/smp.h> #include <asm/elf.h> #include <asm/cputable.h> #include <asm/bootx.h> #include <asm/btext.h> #include <asm/machdep.h> #include <asm/uaccess.h> #include <asm/system.h> #include <asm/pmac_feature.h> #include <asm/sections.h> #include <asm/nvram.h> #include <asm/xmon.h> #include <asm/time.h> #include <asm/serial.h> #include <asm/udbg.h> #include "setup.h" #define DBG(fmt...) #if defined CONFIG_KGDB #include <asm/kgdb.h> #endif extern void bootx_init(unsigned long r4, unsigned long phys); struct ide_machdep_calls ppc_ide_md; int boot_cpuid; EXPORT_SYMBOL_GPL(boot_cpuid); int boot_cpuid_phys; unsigned long ISA_DMA_THRESHOLD; unsigned int DMA_MODE_READ; unsigned int DMA_MODE_WRITE; int have_of = 1; #ifdef CONFIG_VGA_CONSOLE unsigned long vgacon_remap_base; EXPORT_SYMBOL(vgacon_remap_base); #endif /* * 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; /* * We're called here very early in the boot. We determine the machine * type and call the appropriate low-level setup functions. * -- Cort <cort@fsmlabs.com> * * Note that the kernel may be running at an address which is different * from the address that it was linked at, so we must use RELOC/PTRRELOC * to access static data (including strings). -- paulus */ unsigned long __init early_init(unsigned long dt_ptr) { unsigned long offset = reloc_offset(); struct cpu_spec *spec; /* First zero the BSS -- use memset_io, some platforms don't have * caches on yet */ memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start); /* * Identify the CPU type and fix up code sections * that depend on which cpu we have. */ spec = identify_cpu(offset, mfspr(SPRN_PVR)); do_feature_fixups(spec->cpu_features, PTRRELOC(&__start___ftr_fixup), PTRRELOC(&__stop___ftr_fixup)); return KERNELBASE + offset; } /* * Find out what kind of machine we're on and save any data we need * from the early boot process (devtree is copied on pmac by prom_init()). * This is called very early on the boot process, after a minimal * MMU environment has been set up but before MMU_init is called. */ void __init machine_init(unsigned long dt_ptr, unsigned long phys) { /* Enable early debugging if any specified (see udbg.h) */ udbg_early_init(); /* Do some early initialization based on the flat device tree */ early_init_devtree(__va(dt_ptr)); probe_machine(); #ifdef CONFIG_6xx if (cpu_has_feature(CPU_FTR_CAN_DOZE) || cpu_has_feature(CPU_FTR_CAN_NAP)) ppc_md.power_save = ppc6xx_idle; #endif if (ppc_md.progress) ppc_md.progress("id mach(): done", 0x200); } #ifdef CONFIG_BOOKE_WDT /* Checks wdt=x and wdt_period=xx command-line option */ int __init early_parse_wdt(char *p) { if (p && strncmp(p, "0", 1) != 0) booke_wdt_enabled = 1; return 0; } early_param("wdt", early_parse_wdt); int __init early_parse_wdt_period (char *p) { if (p) booke_wdt_period = simple_strtoul(p, NULL, 0); return 0; } early_param("wdt_period", early_parse_wdt_period); #endif /* CONFIG_BOOKE_WDT */ /* Checks "l2cr=xxxx" command-line option */ int __init ppc_setup_l2cr(char *str) { if (cpu_has_feature(CPU_FTR_L2CR)) { unsigned long val = simple_strtoul(str, NULL, 0); printk(KERN_INFO "l2cr set to %lx\n", val); _set_L2CR(0); /* force invalidate by disable cache */ _set_L2CR(val); /* and enable it */ } return 1; } __setup("l2cr=", ppc_setup_l2cr); #ifdef CONFIG_GENERIC_NVRAM /* Generic nvram hooks used by drivers/char/gen_nvram.c */ unsigned char nvram_read_byte(int addr) { if (ppc_md.nvram_read_val) return ppc_md.nvram_read_val(addr); return 0xff; } EXPORT_SYMBOL(nvram_read_byte); void nvram_write_byte(unsigned char val, int addr) { if (ppc_md.nvram_write_val) ppc_md.nvram_write_val(addr, val); } EXPORT_SYMBOL(nvram_write_byte); void nvram_sync(void) { if (ppc_md.nvram_sync) ppc_md.nvram_sync(); } EXPORT_SYMBOL(nvram_sync); #endif /* CONFIG_NVRAM */ static DEFINE_PER_CPU(struct cpu, cpu_devices); int __init ppc_init(void) { int cpu; /* clear the progress line */ if (ppc_md.progress) ppc_md.progress(" ", 0xffff); /* register CPU devices */ for_each_possible_cpu(cpu) { struct cpu *c = &per_cpu(cpu_devices, cpu); c->hotpluggable = 1; register_cpu(c, cpu); } /* call platform init */ if (ppc_md.init != NULL) { ppc_md.init(); } return 0; } arch_initcall(ppc_init); /* Warning, IO base is not yet inited */ void __init setup_arch(char **cmdline_p) { *cmdline_p = cmd_line; /* so udelay does something sensible, assume <= 1000 bogomips */ loops_per_jiffy = 500000000 / HZ; unflatten_device_tree(); check_for_initrd(); if (ppc_md.init_early) ppc_md.init_early(); find_legacy_serial_ports(); smp_setup_cpu_maps(); /* Register early console */ register_early_udbg_console(); xmon_setup(); #if defined(CONFIG_KGDB) if (ppc_md.kgdb_map_scc) ppc_md.kgdb_map_scc(); set_debug_traps(); if (strstr(cmd_line, "gdb")) { if (ppc_md.progress) ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000); printk("kgdb breakpoint activated\n"); breakpoint(); } #endif /* * 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. */ if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) { dcache_bsize = cur_cpu_spec->dcache_bsize; icache_bsize = cur_cpu_spec->icache_bsize; ucache_bsize = 0; } else ucache_bsize = dcache_bsize = icache_bsize = cur_cpu_spec->dcache_bsize; /* 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; /* set up the bootmem stuff with available memory */ do_init_bootmem(); if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); #ifdef CONFIG_DUMMY_CONSOLE conswitchp = &dummy_con; #endif ppc_md.setup_arch(); if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); paging_init(); }