+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- *
- * linux/arch/cris/kernel/setup.c
- *
- * Copyright (C) 1995 Linus Torvalds
- * Copyright (c) 2001 Axis Communications AB
- */
-
-/*
- * This file handles the architecture-dependent parts of initialization
- */
-
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/bootmem.h>
-#include <asm/pgtable.h>
-#include <linux/seq_file.h>
-#include <linux/screen_info.h>
-#include <linux/utsname.h>
-#include <linux/pfn.h>
-#include <linux/cpu.h>
-#include <linux/of.h>
-#include <linux/of_fdt.h>
-#include <asm/setup.h>
-#include <arch/system.h>
-#include <asm/sections.h>
-
-/*
- * Setup options
- */
-struct screen_info screen_info;
-
-extern int root_mountflags;
-
-char __initdata cris_command_line[COMMAND_LINE_SIZE] = { 0, };
-
-extern const unsigned long text_start, edata; /* set by the linker script */
-extern unsigned long dram_start, dram_end;
-
-extern unsigned long romfs_start, romfs_length, romfs_in_flash; /* from head.S */
-
-static struct cpu cpu_devices[NR_CPUS];
-
-extern void show_etrax_copyright(void); /* arch-vX/kernel/setup.c */
-
-/* This mainly sets up the memory area, and can be really confusing.
- *
- * The physical DRAM is virtually mapped into dram_start to dram_end
- * (usually c0000000 to c0000000 + DRAM size). The physical address is
- * given by the macro __pa().
- *
- * In this DRAM, the kernel code and data is loaded, in the beginning.
- * It really starts at c0004000 to make room for some special pages -
- * the start address is text_start. The kernel data ends at _end. After
- * this the ROM filesystem is appended (if there is any).
- *
- * Between this address and dram_end, we have RAM pages usable to the
- * boot code and the system.
- *
- */
-
-void __init setup_arch(char **cmdline_p)
-{
- extern void init_etrax_debug(void);
- unsigned long bootmap_size;
- unsigned long start_pfn, max_pfn;
- unsigned long memory_start;
-
-#ifdef CONFIG_OF
- early_init_dt_scan(__dtb_start);
-#endif
-
- /* register an initial console printing routine for printk's */
-
- init_etrax_debug();
-
- /* we should really poll for DRAM size! */
-
- high_memory = &dram_end;
-
- if(romfs_in_flash || !romfs_length) {
- /* if we have the romfs in flash, or if there is no rom filesystem,
- * our free area starts directly after the BSS
- */
- memory_start = (unsigned long) &_end;
- } else {
- /* otherwise the free area starts after the ROM filesystem */
- printk("ROM fs in RAM, size %lu bytes\n", romfs_length);
- memory_start = romfs_start + romfs_length;
- }
-
- /* process 1's initial memory region is the kernel code/data */
-
- init_mm.start_code = (unsigned long) &text_start;
- init_mm.end_code = (unsigned long) &_etext;
- init_mm.end_data = (unsigned long) &_edata;
- init_mm.brk = (unsigned long) &_end;
-
- /* min_low_pfn points to the start of DRAM, start_pfn points
- * to the first DRAM pages after the kernel, and max_low_pfn
- * to the end of DRAM.
- */
-
- /*
- * partially used pages are not usable - thus
- * we are rounding upwards:
- */
-
- start_pfn = PFN_UP(memory_start); /* usually c0000000 + kernel + romfs */
- max_pfn = PFN_DOWN((unsigned long)high_memory); /* usually c0000000 + dram size */
-
- /*
- * Initialize the boot-time allocator (start, end)
- *
- * We give it access to all our DRAM, but we could as well just have
- * given it a small slice. No point in doing that though, unless we
- * have non-contiguous memory and want the boot-stuff to be in, say,
- * the smallest area.
- *
- * It will put a bitmap of the allocated pages in the beginning
- * of the range we give it, but it won't mark the bitmaps pages
- * as reserved. We have to do that ourselves below.
- *
- * We need to use init_bootmem_node instead of init_bootmem
- * because our map starts at a quite high address (min_low_pfn).
- */
-
- max_low_pfn = max_pfn;
- min_low_pfn = PAGE_OFFSET >> PAGE_SHIFT;
-
- bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
- min_low_pfn,
- max_low_pfn);
-
- /* And free all memory not belonging to the kernel (addr, size) */
-
- free_bootmem(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn - start_pfn));
-
- /*
- * Reserve the bootmem bitmap itself as well. We do this in two
- * steps (first step was init_bootmem()) because this catches
- * the (very unlikely) case of us accidentally initializing the
- * bootmem allocator with an invalid RAM area.
- *
- * Arguments are start, size
- */
-
- reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
-
- unflatten_and_copy_device_tree();
-
- /* paging_init() sets up the MMU and marks all pages as reserved */
-
- paging_init();
-
- *cmdline_p = cris_command_line;
-
-#ifdef CONFIG_ETRAX_CMDLINE
- if (!strcmp(cris_command_line, "")) {
- strlcpy(cris_command_line, CONFIG_ETRAX_CMDLINE, COMMAND_LINE_SIZE);
- cris_command_line[COMMAND_LINE_SIZE - 1] = '\0';
- }
-#endif
-
- /* Save command line for future references. */
- memcpy(boot_command_line, cris_command_line, COMMAND_LINE_SIZE);
- boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
-
- /* give credit for the CRIS port */
- show_etrax_copyright();
-
- /* Setup utsname */
- strcpy(init_utsname()->machine, cris_machine_name);
-}
-
-#ifdef CONFIG_PROC_FS
-static void *c_start(struct seq_file *m, loff_t *pos)
-{
- return *pos < nr_cpu_ids ? (void *)(int)(*pos + 1) : 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)
-{
-}
-
-extern int show_cpuinfo(struct seq_file *m, void *v);
-
-const struct seq_operations cpuinfo_op = {
- .start = c_start,
- .next = c_next,
- .stop = c_stop,
- .show = show_cpuinfo,
-};
-#endif /* CONFIG_PROC_FS */
-
-static int __init topology_init(void)
-{
- int i;
-
- for_each_possible_cpu(i) {
- return register_cpu(&cpu_devices[i], i);
- }
-
- return 0;
-}
-
-subsys_initcall(topology_init);
projects / linux-2.6-block.git / blobdiff