425 lines
10 KiB
C
Executable File
425 lines
10 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m32r/kernel/setup.c
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*
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* Setup routines for Renesas M32R
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*
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* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
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* Hitoshi Yamamoto
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/fs.h>
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#include <linux/sched/mm.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/console.h>
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#include <linux/initrd.h>
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#include <linux/major.h>
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#include <linux/root_dev.h>
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#include <linux/seq_file.h>
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#include <linux/timex.h>
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#include <linux/screen_info.h>
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#include <linux/cpu.h>
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#include <linux/nodemask.h>
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#include <linux/pfn.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/m32r.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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#ifdef CONFIG_MMU
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extern void init_mmu(void);
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#endif
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extern char _end[];
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/*
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* Machine setup..
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*/
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struct cpuinfo_m32r boot_cpu_data;
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#ifdef CONFIG_BLK_DEV_RAM
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extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
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extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
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extern int rd_image_start; /* starting block # of image */
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#endif
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#if defined(CONFIG_VGA_CONSOLE)
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struct screen_info screen_info = {
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.orig_video_lines = 25,
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.orig_video_cols = 80,
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.orig_video_mode = 0,
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.orig_video_ega_bx = 0,
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.orig_video_isVGA = 1,
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.orig_video_points = 8
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};
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#endif
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extern int root_mountflags;
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static char __initdata command_line[COMMAND_LINE_SIZE];
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static struct resource data_resource = {
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.name = "Kernel data",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
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};
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static struct resource code_resource = {
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.name = "Kernel code",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
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};
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unsigned long memory_start;
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EXPORT_SYMBOL(memory_start);
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unsigned long memory_end;
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EXPORT_SYMBOL(memory_end);
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void __init setup_arch(char **);
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int get_cpuinfo(char *);
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static __inline__ void parse_mem_cmdline(char ** cmdline_p)
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{
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char c = ' ';
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char *to = command_line;
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char *from = COMMAND_LINE;
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int len = 0;
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int usermem = 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)CONFIG_MEMORY_START+PAGE_OFFSET;
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memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
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for ( ; ; ) {
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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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usermem = 1;
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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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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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if (usermem)
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printk(KERN_INFO "user-defined physical RAM map:\n");
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}
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#ifndef CONFIG_DISCONTIGMEM
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static unsigned long __init setup_memory(void)
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{
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unsigned long start_pfn, max_low_pfn, bootmap_size;
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start_pfn = PFN_UP( __pa(_end) );
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max_low_pfn = PFN_DOWN( __pa(memory_end) );
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/*
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* Initialize the boot-time allocator (with low memory only):
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*/
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bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
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CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
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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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{
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unsigned long curr_pfn;
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unsigned long last_pfn;
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unsigned long 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(__pa(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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/*
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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(CONFIG_MEMORY_START + PAGE_SIZE,
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(PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
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- CONFIG_MEMORY_START,
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BOOTMEM_DEFAULT);
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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(CONFIG_MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
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/*
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* reserve memory hole
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*/
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#ifdef CONFIG_MEMHOLE
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reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE,
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BOOTMEM_DEFAULT);
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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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, INITRD_SIZE,
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BOOTMEM_DEFAULT);
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initrd_start = INITRD_START + PAGE_OFFSET;
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initrd_end = initrd_start + INITRD_SIZE;
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printk("initrd:start[%08lx],size[%08lx]\n",
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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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return max_low_pfn;
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}
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#else /* CONFIG_DISCONTIGMEM */
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extern unsigned long setup_memory(void);
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#endif /* CONFIG_DISCONTIGMEM */
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void __init setup_arch(char **cmdline_p)
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{
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ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
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boot_cpu_data.cpu_clock = M32R_CPUCLK;
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boot_cpu_data.bus_clock = M32R_BUSCLK;
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boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
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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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#ifdef CONFIG_VT
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#if defined(CONFIG_VGA_CONSOLE)
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conswitchp = &vga_con;
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#elif defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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#endif
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#ifdef CONFIG_DISCONTIGMEM
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nodes_clear(node_online_map);
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node_set_online(0);
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node_set_online(1);
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#endif /* CONFIG_DISCONTIGMEM */
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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_mem_cmdline(cmdline_p);
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setup_memory();
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paging_init();
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}
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static struct cpu cpu_devices[NR_CPUS];
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static int __init topology_init(void)
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{
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int i;
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for_each_present_cpu(i)
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register_cpu(&cpu_devices[i], i);
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return 0;
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}
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subsys_initcall(topology_init);
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#ifdef CONFIG_PROC_FS
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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 cpuinfo_m32r *c = v;
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unsigned long cpu = c - cpu_data;
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#ifdef CONFIG_SMP
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if (!cpu_online(cpu))
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return 0;
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#endif /* CONFIG_SMP */
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seq_printf(m, "processor\t: %ld\n", cpu);
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#if defined(CONFIG_CHIP_VDEC2)
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seq_printf(m, "cpu family\t: VDEC2\n"
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"cache size\t: Unknown\n");
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#elif defined(CONFIG_CHIP_M32700)
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seq_printf(m,"cpu family\t: M32700\n"
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"cache size\t: I-8KB/D-8KB\n");
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#elif defined(CONFIG_CHIP_M32102)
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seq_printf(m,"cpu family\t: M32102\n"
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"cache size\t: I-8KB\n");
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#elif defined(CONFIG_CHIP_OPSP)
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seq_printf(m,"cpu family\t: OPSP\n"
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"cache size\t: I-8KB/D-8KB\n");
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#elif defined(CONFIG_CHIP_MP)
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seq_printf(m, "cpu family\t: M32R-MP\n"
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"cache size\t: I-xxKB/D-xxKB\n");
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#elif defined(CONFIG_CHIP_M32104)
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seq_printf(m,"cpu family\t: M32104\n"
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"cache size\t: I-8KB/D-8KB\n");
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#else
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seq_printf(m, "cpu family\t: Unknown\n");
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#endif
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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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#if defined(CONFIG_PLAT_MAPPI)
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seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
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#elif defined(CONFIG_PLAT_MAPPI2)
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seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
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#elif defined(CONFIG_PLAT_MAPPI3)
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seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
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#elif defined(CONFIG_PLAT_M32700UT)
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seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
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#elif defined(CONFIG_PLAT_OPSPUT)
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seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
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#elif defined(CONFIG_PLAT_USRV)
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seq_printf(m, "Machine\t\t: uServer\n");
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#elif defined(CONFIG_PLAT_OAKS32R)
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seq_printf(m, "Machine\t\t: OAKS32R\n");
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#elif defined(CONFIG_PLAT_M32104UT)
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seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
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#else
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seq_printf(m, "Machine\t\t: Unknown\n");
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#endif
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#define PRINT_CLOCK(name, value) \
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seq_printf(m, name " clock\t: %d.%02dMHz\n", \
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((value) / 1000000), ((value) % 1000000)/10000)
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PRINT_CLOCK("CPU", (int)c->cpu_clock);
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PRINT_CLOCK("Bus", (int)c->bus_clock);
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seq_printf(m, "\n");
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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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const 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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unsigned long cpu_initialized __initdata = 0;
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/*
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* cpu_init() initializes state that is per-CPU. Some data is already
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* initialized (naturally) in the bootstrap process.
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* We reload them nevertheless, this function acts as a
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* 'CPU state barrier', nothing should get across.
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*/
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#if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2) \
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|| defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
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|| defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
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void __init cpu_init (void)
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{
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int cpu_id = smp_processor_id();
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if (test_and_set_bit(cpu_id, &cpu_initialized)) {
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printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
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for ( ; ; )
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local_irq_enable();
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}
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printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
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/* Set up and load the per-CPU TSS and LDT */
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mmgrab(&init_mm);
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current->active_mm = &init_mm;
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if (current->mm)
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BUG();
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/* Force FPU initialization */
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current_thread_info()->status = 0;
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clear_used_math();
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#ifdef CONFIG_MMU
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/* Set up MMU */
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init_mmu();
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#endif
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/* Set up ICUIMASK */
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outl(0x00070000, M32R_ICU_IMASK_PORTL); /* imask=111 */
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}
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#endif /* defined(CONFIG_CHIP_VDEC2) ... */
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