![Paul Mundt](/assets/img/avatar_default.png)
Add a CPU flag for the CPUs that support 32-bit opcodes, which gets passed down to userspace. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
532 lines
13 KiB
C
532 lines
13 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 <asm/uaccess.h>
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#include <asm/io.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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extern void * __rd_start, * __rd_end;
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/*
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* Machine setup..
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*/
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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 boot_cpu_data = { CPU_SH_NONE, 10000000, };
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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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#if defined(CONFIG_SH_UNKNOWN)
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struct sh_machine_vector sh_mv;
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#endif
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extern int root_mountflags;
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#define MV_NAME_SIZE 32
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static struct sh_machine_vector* __init get_mv_byname(const char* name);
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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, memory_end;
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static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
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struct sh_machine_vector** mvp,
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unsigned long *mv_io_base)
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{
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char c = ' ', *to = command_line, *from = COMMAND_LINE;
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int len = 0;
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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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boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
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memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
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memory_end = memory_start + __MEMORY_SIZE;
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for (;;) {
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/*
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* "mem=XXX[kKmM]" defines a size of memory.
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*/
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if (c == ' ' && !memcmp(from, "mem=", 4)) {
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if (to != command_line)
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to--;
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{
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unsigned long mem_size;
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mem_size = memparse(from+4, &from);
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memory_end = memory_start + mem_size;
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}
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}
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if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
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char* mv_end;
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char* mv_comma;
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int mv_len;
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if (to != command_line)
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to--;
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from += 6;
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mv_end = strchr(from, ' ');
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if (mv_end == NULL)
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mv_end = from + strlen(from);
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mv_comma = strchr(from, ',');
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if ((mv_comma != NULL) && (mv_comma < mv_end)) {
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int ints[3];
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get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
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*mv_io_base = ints[1];
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mv_len = mv_comma - from;
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} else {
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mv_len = mv_end - from;
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}
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if (mv_len > (MV_NAME_SIZE-1))
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mv_len = MV_NAME_SIZE-1;
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memcpy(mv_name, from, mv_len);
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mv_name[mv_len] = '\0';
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from = mv_end;
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*mvp = get_mv_byname(mv_name);
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}
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c = *(from++);
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if (!c)
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break;
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if (COMMAND_LINE_SIZE <= ++len)
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break;
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*(to++) = c;
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}
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*to = '\0';
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*cmdline_p = command_line;
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}
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static int __init sh_mv_setup(char **cmdline_p)
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{
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#ifdef CONFIG_SH_UNKNOWN
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extern struct sh_machine_vector mv_unknown;
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#endif
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struct sh_machine_vector *mv = NULL;
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char mv_name[MV_NAME_SIZE] = "";
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unsigned long mv_io_base = 0;
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parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
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#ifdef CONFIG_SH_UNKNOWN
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if (mv == NULL) {
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mv = &mv_unknown;
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if (*mv_name != '\0') {
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printk("Warning: Unsupported machine %s, using unknown\n",
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mv_name);
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}
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}
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sh_mv = *mv;
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#endif
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/*
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* Manually walk the vec, fill in anything that the board hasn't yet
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* by hand, wrapping to the generic implementation.
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*/
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#define mv_set(elem) do { \
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if (!sh_mv.mv_##elem) \
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sh_mv.mv_##elem = generic_##elem; \
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} while (0)
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mv_set(inb); mv_set(inw); mv_set(inl);
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mv_set(outb); mv_set(outw); mv_set(outl);
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mv_set(inb_p); mv_set(inw_p); mv_set(inl_p);
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mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
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mv_set(insb); mv_set(insw); mv_set(insl);
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mv_set(outsb); mv_set(outsw); mv_set(outsl);
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mv_set(readb); mv_set(readw); mv_set(readl);
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mv_set(writeb); mv_set(writew); mv_set(writel);
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mv_set(ioport_map);
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mv_set(ioport_unmap);
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mv_set(irq_demux);
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#ifdef CONFIG_SH_UNKNOWN
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__set_io_port_base(mv_io_base);
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#endif
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if (!sh_mv.mv_nr_irqs)
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sh_mv.mv_nr_irqs = NR_IRQS;
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return 0;
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}
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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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void __init setup_bootmem_allocator(unsigned long start_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), start_pfn,
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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(start_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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#ifdef CONFIG_BLK_DEV_INITRD
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ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
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if (&__rd_start != &__rd_end) {
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LOADER_TYPE = 1;
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INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
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__MEMORY_START;
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INITRD_SIZE = (unsigned long)&__rd_end -
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(unsigned long)&__rd_start;
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}
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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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#ifdef CONFIG_KEXEC
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if (crashk_res.start != crashk_res.end)
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reserve_bootmem(crashk_res.start,
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crashk_res.end - crashk_res.start + 1);
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#endif
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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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#ifdef CONFIG_CMDLINE_BOOL
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strcpy(COMMAND_LINE, CONFIG_CMDLINE);
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#endif
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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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parse_early_param();
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sh_mv_setup(cmdline_p);
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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_memory();
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paging_init();
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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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}
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struct sh_machine_vector* __init get_mv_byname(const char* name)
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{
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extern long __machvec_start, __machvec_end;
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struct sh_machine_vector *all_vecs =
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(struct sh_machine_vector *)&__machvec_start;
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int i, n = ((unsigned long)&__machvec_end
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- (unsigned long)&__machvec_start)/
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sizeof(struct sh_machine_vector);
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for (i = 0; i < n; ++i) {
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struct sh_machine_vector *mv = &all_vecs[i];
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if (mv == NULL)
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continue;
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if (strcasecmp(name, get_system_type()) == 0) {
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return mv;
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}
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}
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return NULL;
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}
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static struct cpu cpu[NR_CPUS];
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static int __init topology_init(void)
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{
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int cpu_id;
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for_each_possible_cpu(cpu_id)
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register_cpu(&cpu[cpu_id], cpu_id);
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return 0;
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}
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subsys_initcall(topology_init);
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static const char *cpu_name[] = {
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[CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
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[CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300",
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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",
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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", [CPU_SH73180] = "SH73180",
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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_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 {
|
|
seq_printf(m, "split (harvard)\n");
|
|
show_cacheinfo(m, "icache", c->icache);
|
|
show_cacheinfo(m, "dcache", c->dcache);
|
|
}
|
|
|
|
/* Optional secondary cache */
|
|
if (c->flags & CPU_HAS_L2_CACHE)
|
|
show_cacheinfo(m, "scache", c->scache);
|
|
|
|
seq_printf(m, "bogomips\t: %lu.%02lu\n",
|
|
c->loops_per_jiffy/(500000/HZ),
|
|
(c->loops_per_jiffy/(5000/HZ)) % 100);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *c_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
return *pos < NR_CPUS ? cpu_data + *pos : NULL;
|
|
}
|
|
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return c_start(m, pos);
|
|
}
|
|
static void c_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
struct seq_operations cpuinfo_op = {
|
|
.start = c_start,
|
|
.next = c_next,
|
|
.stop = c_stop,
|
|
.show = show_cpuinfo,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|