| /* |
| * 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/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 <linux/memblock.h> |
| |
| #include <asm/io.h> |
| #include <asm/prom.h> |
| #include <asm/processor.h> |
| #include <asm/pgtable.h> |
| #include <asm/setup.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 <asm/mmu_context.h> |
| |
| #include "setup.h" |
| |
| #define DBG(fmt...) |
| |
| extern void bootx_init(unsigned long r4, unsigned long phys); |
| |
| int boot_cpuid; |
| EXPORT_SYMBOL_GPL(boot_cpuid); |
| int boot_cpuid_phys; |
| |
| int smp_hw_index[NR_CPUS]; |
| |
| unsigned long ISA_DMA_THRESHOLD; |
| unsigned int DMA_MODE_READ; |
| unsigned int DMA_MODE_WRITE; |
| |
| #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 |
| */ |
| notrace 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)); |
| |
| do_feature_fixups(spec->mmu_features, |
| PTRRELOC(&__start___mmu_ftr_fixup), |
| PTRRELOC(&__stop___mmu_ftr_fixup)); |
| |
| do_lwsync_fixups(spec->cpu_features, |
| PTRRELOC(&__start___lwsync_fixup), |
| PTRRELOC(&__stop___lwsync_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. |
| */ |
| notrace void __init machine_init(unsigned long dt_ptr) |
| { |
| lockdep_init(); |
| |
| /* 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(); |
| |
| setup_kdump_trampoline(); |
| |
| #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 |
| |
| #ifdef CONFIG_E500 |
| if (cpu_has_feature(CPU_FTR_CAN_DOZE) || |
| cpu_has_feature(CPU_FTR_CAN_NAP)) |
| ppc_md.power_save = e500_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 */ |
| notrace 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); |
| |
| /* Checks "l3cr=xxxx" command-line option */ |
| int __init ppc_setup_l3cr(char *str) |
| { |
| if (cpu_has_feature(CPU_FTR_L3CR)) { |
| unsigned long val = simple_strtoul(str, NULL, 0); |
| printk(KERN_INFO "l3cr set to %lx\n", val); |
| _set_L3CR(val); /* and enable it */ |
| } |
| return 1; |
| } |
| __setup("l3cr=", ppc_setup_l3cr); |
| |
| #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); |
| |
| ssize_t nvram_get_size(void) |
| { |
| if (ppc_md.nvram_size) |
| return ppc_md.nvram_size(); |
| return -1; |
| } |
| EXPORT_SYMBOL(nvram_get_size); |
| |
| void nvram_sync(void) |
| { |
| if (ppc_md.nvram_sync) |
| ppc_md.nvram_sync(); |
| } |
| EXPORT_SYMBOL(nvram_sync); |
| |
| #endif /* CONFIG_NVRAM */ |
| |
| int __init ppc_init(void) |
| { |
| /* clear the progress line */ |
| if (ppc_md.progress) |
| ppc_md.progress(" ", 0xffff); |
| |
| /* call platform init */ |
| if (ppc_md.init != NULL) { |
| ppc_md.init(); |
| } |
| return 0; |
| } |
| |
| arch_initcall(ppc_init); |
| |
| static void __init irqstack_early_init(void) |
| { |
| unsigned int i; |
| |
| /* interrupt stacks must be in lowmem, we get that for free on ppc32 |
| * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ |
| for_each_possible_cpu(i) { |
| softirq_ctx[i] = (struct thread_info *) |
| __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
| hardirq_ctx[i] = (struct thread_info *) |
| __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
| } |
| } |
| |
| #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) |
| static void __init exc_lvl_early_init(void) |
| { |
| unsigned int i, hw_cpu; |
| |
| /* interrupt stacks must be in lowmem, we get that for free on ppc32 |
| * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ |
| for_each_possible_cpu(i) { |
| hw_cpu = get_hard_smp_processor_id(i); |
| critirq_ctx[hw_cpu] = (struct thread_info *) |
| __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
| #ifdef CONFIG_BOOKE |
| dbgirq_ctx[hw_cpu] = (struct thread_info *) |
| __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
| mcheckirq_ctx[hw_cpu] = (struct thread_info *) |
| __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
| #endif |
| } |
| } |
| #else |
| #define exc_lvl_early_init() |
| #endif |
| |
| /* 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(); |
| |
| /* |
| * 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 = cur_cpu_spec->dcache_bsize; |
| icache_bsize = cur_cpu_spec->icache_bsize; |
| ucache_bsize = 0; |
| if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) |
| ucache_bsize = icache_bsize = dcache_bsize; |
| |
| /* reboot on panic */ |
| panic_timeout = 180; |
| |
| if (ppc_md.panic) |
| setup_panic(); |
| |
| init_mm.start_code = (unsigned long)_stext; |
| init_mm.end_code = (unsigned long) _etext; |
| init_mm.end_data = (unsigned long) _edata; |
| init_mm.brk = klimit; |
| |
| exc_lvl_early_init(); |
| |
| irqstack_early_init(); |
| |
| /* 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 |
| |
| if (ppc_md.setup_arch) |
| ppc_md.setup_arch(); |
| if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); |
| |
| paging_init(); |
| |
| /* Initialize the MMU context management stuff */ |
| mmu_context_init(); |
| |
| } |