forked from Minki/linux
3f9654f02e
When the SH kernel used to support embedding a ramdisk in the pre-initramfs days it was placed in a special section and made to look like a regular initrd. Since that was removed ages ago, kill off the remaining cruft that was missed. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
428 lines
11 KiB
C
428 lines
11 KiB
C
/*
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* arch/sh/kernel/setup.c
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*
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* This file handles the architecture-dependent parts of initialization
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 - 2007 Paul Mundt
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*/
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#include <linux/screen_info.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/bootmem.h>
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#include <linux/console.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/utsname.h>
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#include <linux/nodemask.h>
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#include <linux/cpu.h>
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#include <linux/pfn.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <asm/sections.h>
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#include <asm/irq.h>
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#include <asm/setup.h>
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#include <asm/clock.h>
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#include <asm/mmu_context.h>
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/*
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* Initialize loops_per_jiffy as 10000000 (1000MIPS).
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* This value will be used at the very early stage of serial setup.
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* The bigger value means no problem.
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*/
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struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
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[0] = {
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.type = CPU_SH_NONE,
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.loops_per_jiffy = 10000000,
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},
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};
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EXPORT_SYMBOL(cpu_data);
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/*
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* The machine vector. First entry in .machvec.init, or clobbered by
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* sh_mv= on the command line, prior to .machvec.init teardown.
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*/
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struct sh_machine_vector sh_mv = { .mv_name = "generic", };
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#ifdef CONFIG_VT
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struct screen_info screen_info;
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#endif
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extern int root_mountflags;
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/*
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* This is set up by the setup-routine at boot-time
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*/
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#define PARAM ((unsigned char *)empty_zero_page)
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#define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
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#define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
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#define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
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#define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
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#define INITRD_START (*(unsigned long *) (PARAM+0x010))
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#define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
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/* ... */
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#define COMMAND_LINE ((char *) (PARAM+0x100))
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
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static struct resource code_resource = { .name = "Kernel code", };
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static struct resource data_resource = { .name = "Kernel data", };
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unsigned long memory_start;
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EXPORT_SYMBOL(memory_start);
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unsigned long memory_end = 0;
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EXPORT_SYMBOL(memory_end);
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static int __init early_parse_mem(char *p)
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{
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unsigned long size;
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memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
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size = memparse(p, &p);
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memory_end = memory_start + size;
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return 0;
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}
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early_param("mem", early_parse_mem);
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/*
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* Register fully available low RAM pages with the bootmem allocator.
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*/
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static void __init register_bootmem_low_pages(void)
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{
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unsigned long curr_pfn, last_pfn, pages;
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/*
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* We are rounding up the start address of usable memory:
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*/
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curr_pfn = PFN_UP(__MEMORY_START);
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/*
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* ... and at the end of the usable range downwards:
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*/
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last_pfn = PFN_DOWN(__pa(memory_end));
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if (last_pfn > max_low_pfn)
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last_pfn = max_low_pfn;
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pages = last_pfn - curr_pfn;
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free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
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}
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#ifdef CONFIG_KEXEC
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static void __init reserve_crashkernel(void)
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{
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unsigned long long free_mem;
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unsigned long long crash_size, crash_base;
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int ret;
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free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
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ret = parse_crashkernel(boot_command_line, free_mem,
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&crash_size, &crash_base);
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if (ret == 0 && crash_size) {
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if (crash_base > 0) {
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printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
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"for crashkernel (System RAM: %ldMB)\n",
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(unsigned long)(crash_size >> 20),
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(unsigned long)(crash_base >> 20),
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(unsigned long)(free_mem >> 20));
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crashk_res.start = crash_base;
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crashk_res.end = crash_base + crash_size - 1;
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reserve_bootmem(crash_base, crash_size);
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} else
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printk(KERN_INFO "crashkernel reservation failed - "
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"you have to specify a base address\n");
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}
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}
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#else
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static inline void __init reserve_crashkernel(void)
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{}
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#endif
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void __init setup_bootmem_allocator(unsigned long free_pfn)
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{
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unsigned long bootmap_size;
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/*
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* Find a proper area for the bootmem bitmap. After this
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* bootstrap step all allocations (until the page allocator
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* is intact) must be done via bootmem_alloc().
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*/
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bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
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min_low_pfn, max_low_pfn);
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add_active_range(0, min_low_pfn, max_low_pfn);
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register_bootmem_low_pages();
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node_set_online(0);
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/*
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* Reserve the kernel text and
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* Reserve the bootmem bitmap. We do this in two steps (first step
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* was init_bootmem()), because this catches the (definitely buggy)
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* case of us accidentally initializing the bootmem allocator with
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* an invalid RAM area.
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*/
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reserve_bootmem(__MEMORY_START+PAGE_SIZE,
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(PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
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/*
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* reserve physical page 0 - it's a special BIOS page on many boxes,
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* enabling clean reboots, SMP operation, laptop functions.
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*/
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reserve_bootmem(__MEMORY_START, PAGE_SIZE);
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sparse_memory_present_with_active_regions(0);
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#ifdef CONFIG_BLK_DEV_INITRD
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ROOT_DEV = Root_RAM0;
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if (LOADER_TYPE && INITRD_START) {
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if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
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reserve_bootmem(INITRD_START + __MEMORY_START,
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INITRD_SIZE);
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initrd_start = INITRD_START + PAGE_OFFSET +
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__MEMORY_START;
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initrd_end = initrd_start + INITRD_SIZE;
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} else {
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printk("initrd extends beyond end of memory "
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"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
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INITRD_START + INITRD_SIZE,
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max_low_pfn << PAGE_SHIFT);
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initrd_start = 0;
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}
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}
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#endif
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reserve_crashkernel();
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}
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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static void __init setup_memory(void)
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{
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unsigned long start_pfn;
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/*
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* Partially used pages are not usable - thus
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* we are rounding upwards:
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*/
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start_pfn = PFN_UP(__pa(_end));
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setup_bootmem_allocator(start_pfn);
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}
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#else
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extern void __init setup_memory(void);
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#endif
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void __init setup_arch(char **cmdline_p)
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{
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enable_mmu();
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ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
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#ifdef CONFIG_BLK_DEV_RAM
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rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
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rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
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rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
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#endif
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if (!MOUNT_ROOT_RDONLY)
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root_mountflags &= ~MS_RDONLY;
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init_mm.start_code = (unsigned long) _text;
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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 = (unsigned long) _end;
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code_resource.start = virt_to_phys(_text);
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code_resource.end = virt_to_phys(_etext)-1;
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data_resource.start = virt_to_phys(_etext);
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data_resource.end = virt_to_phys(_edata)-1;
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memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
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if (!memory_end)
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memory_end = memory_start + __MEMORY_SIZE;
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#ifdef CONFIG_CMDLINE_BOOL
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strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
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#else
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strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
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#endif
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/* Save unparsed command line copy for /proc/cmdline */
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memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
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*cmdline_p = command_line;
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parse_early_param();
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sh_mv_setup();
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/*
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* Find the highest page frame number we have available
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*/
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max_pfn = PFN_DOWN(__pa(memory_end));
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/*
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* Determine low and high memory ranges:
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*/
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max_low_pfn = max_pfn;
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min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
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nodes_clear(node_online_map);
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/* Setup bootmem with available RAM */
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setup_memory();
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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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/* Perform the machine specific initialisation */
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if (likely(sh_mv.mv_setup))
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sh_mv.mv_setup(cmdline_p);
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paging_init();
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#ifdef CONFIG_SMP
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plat_smp_setup();
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#endif
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}
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static const char *cpu_name[] = {
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[CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
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[CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
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[CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
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[CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
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[CPU_SH7712] = "SH7712", [CPU_SH7720] = "SH7720",
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[CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750",
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[CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R",
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[CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R",
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[CPU_SH7760] = "SH7760",
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[CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1",
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[CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
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[CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780",
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[CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343",
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[CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722",
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[CPU_SHX3] = "SH-X3", [CPU_SH_NONE] = "Unknown"
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};
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const char *get_cpu_subtype(struct sh_cpuinfo *c)
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{
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return cpu_name[c->type];
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}
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#ifdef CONFIG_PROC_FS
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/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
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static const char *cpu_flags[] = {
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"none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
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"ptea", "llsc", "l2", "op32", NULL
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};
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static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
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{
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unsigned long i;
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seq_printf(m, "cpu flags\t:");
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if (!c->flags) {
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seq_printf(m, " %s\n", cpu_flags[0]);
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return;
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}
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for (i = 0; cpu_flags[i]; i++)
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if ((c->flags & (1 << i)))
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seq_printf(m, " %s", cpu_flags[i+1]);
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seq_printf(m, "\n");
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}
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static void show_cacheinfo(struct seq_file *m, const char *type,
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struct cache_info info)
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{
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unsigned int cache_size;
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cache_size = info.ways * info.sets * info.linesz;
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seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
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type, cache_size >> 10, info.ways);
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}
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/*
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* Get CPU information for use by the procfs.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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struct sh_cpuinfo *c = v;
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unsigned int cpu = c - cpu_data;
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if (!cpu_online(cpu))
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return 0;
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if (cpu == 0)
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seq_printf(m, "machine\t\t: %s\n", get_system_type());
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seq_printf(m, "processor\t: %d\n", cpu);
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seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
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seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
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show_cpuflags(m, c);
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seq_printf(m, "cache type\t: ");
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/*
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* Check for what type of cache we have, we support both the
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* unified cache on the SH-2 and SH-3, as well as the harvard
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* style cache on the SH-4.
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*/
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if (c->icache.flags & SH_CACHE_COMBINED) {
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seq_printf(m, "unified\n");
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show_cacheinfo(m, "cache", c->icache);
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} else {
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seq_printf(m, "split (harvard)\n");
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show_cacheinfo(m, "icache", c->icache);
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show_cacheinfo(m, "dcache", c->dcache);
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}
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/* Optional secondary cache */
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if (c->flags & CPU_HAS_L2_CACHE)
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show_cacheinfo(m, "scache", c->scache);
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seq_printf(m, "bogomips\t: %lu.%02lu\n",
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c->loops_per_jiffy/(500000/HZ),
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(c->loops_per_jiffy/(5000/HZ)) % 100);
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < NR_CPUS ? cpu_data + *pos : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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#endif /* CONFIG_PROC_FS */
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