![Mathieu Malaterre](/assets/img/avatar_default.png)
Rewrite the comparison in `else if` statement, case where `min_low_pfn > ARCH_PFN_OFFSET` has already been checked in the first `if` statement: if (min_low_pfn > ARCH_PFN_OFFSET) { Fix non-fatal warning during compilation using W=1: arch/mips/kernel/setup.c: In function ‘bootmem_init’: arch/mips/kernel/setup.c:461:25: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] } else if (min_low_pfn < ARCH_PFN_OFFSET) { ^ Signed-off-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: James Hogan <jhogan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/18176/ Signed-off-by: James Hogan <jhogan@kernel.org>
1058 lines
26 KiB
C
1058 lines
26 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 1995 Waldorf Electronics
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
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* Copyright (C) 1996 Stoned Elipot
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
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*/
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/export.h>
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#include <linux/screen_info.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h>
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#include <linux/initrd.h>
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#include <linux/root_dev.h>
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#include <linux/highmem.h>
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#include <linux/console.h>
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#include <linux/pfn.h>
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#include <linux/debugfs.h>
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#include <linux/kexec.h>
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#include <linux/sizes.h>
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#include <linux/device.h>
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#include <linux/dma-contiguous.h>
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#include <linux/decompress/generic.h>
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#include <linux/of_fdt.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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#include <asm/bugs.h>
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#include <asm/cache.h>
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#include <asm/cdmm.h>
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#include <asm/cpu.h>
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#include <asm/debug.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/smp-ops.h>
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#include <asm/prom.h>
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#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
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const char __section(.appended_dtb) __appended_dtb[0x100000];
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#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
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struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
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EXPORT_SYMBOL(cpu_data);
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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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/*
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* Setup information
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*
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* These are initialized so they are in the .data section
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*/
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unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
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EXPORT_SYMBOL(mips_machtype);
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struct boot_mem_map boot_mem_map;
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static char __initdata command_line[COMMAND_LINE_SIZE];
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char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
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#ifdef CONFIG_CMDLINE_BOOL
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static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
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#endif
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/*
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* mips_io_port_base is the begin of the address space to which x86 style
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* I/O ports are mapped.
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*/
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const unsigned long mips_io_port_base = -1;
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EXPORT_SYMBOL(mips_io_port_base);
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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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static struct resource bss_resource = { .name = "Kernel bss", };
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static void *detect_magic __initdata = detect_memory_region;
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void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
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{
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int x = boot_mem_map.nr_map;
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int i;
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/*
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* If the region reaches the top of the physical address space, adjust
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* the size slightly so that (start + size) doesn't overflow
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*/
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if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
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--size;
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/* Sanity check */
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if (start + size < start) {
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pr_warn("Trying to add an invalid memory region, skipped\n");
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return;
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}
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/*
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* Try to merge with existing entry, if any.
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*/
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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struct boot_mem_map_entry *entry = boot_mem_map.map + i;
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unsigned long top;
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if (entry->type != type)
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continue;
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if (start + size < entry->addr)
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continue; /* no overlap */
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if (entry->addr + entry->size < start)
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continue; /* no overlap */
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top = max(entry->addr + entry->size, start + size);
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entry->addr = min(entry->addr, start);
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entry->size = top - entry->addr;
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return;
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}
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if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
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pr_err("Ooops! Too many entries in the memory map!\n");
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return;
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}
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boot_mem_map.map[x].addr = start;
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boot_mem_map.map[x].size = size;
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boot_mem_map.map[x].type = type;
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boot_mem_map.nr_map++;
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}
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void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
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{
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void *dm = &detect_magic;
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phys_addr_t size;
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for (size = sz_min; size < sz_max; size <<= 1) {
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if (!memcmp(dm, dm + size, sizeof(detect_magic)))
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break;
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}
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pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
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((unsigned long long) size) / SZ_1M,
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(unsigned long long) start,
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((unsigned long long) sz_min) / SZ_1M,
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((unsigned long long) sz_max) / SZ_1M);
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add_memory_region(start, size, BOOT_MEM_RAM);
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}
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static bool __init __maybe_unused memory_region_available(phys_addr_t start,
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phys_addr_t size)
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{
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int i;
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bool in_ram = false, free = true;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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phys_addr_t start_, end_;
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start_ = boot_mem_map.map[i].addr;
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end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
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switch (boot_mem_map.map[i].type) {
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case BOOT_MEM_RAM:
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if (start >= start_ && start + size <= end_)
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in_ram = true;
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break;
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case BOOT_MEM_RESERVED:
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if ((start >= start_ && start < end_) ||
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(start < start_ && start + size >= start_))
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free = false;
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break;
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default:
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continue;
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}
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}
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return in_ram && free;
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}
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static void __init print_memory_map(void)
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{
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int i;
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const int field = 2 * sizeof(unsigned long);
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
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field, (unsigned long long) boot_mem_map.map[i].size,
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field, (unsigned long long) boot_mem_map.map[i].addr);
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switch (boot_mem_map.map[i].type) {
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case BOOT_MEM_RAM:
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printk(KERN_CONT "(usable)\n");
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break;
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case BOOT_MEM_INIT_RAM:
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printk(KERN_CONT "(usable after init)\n");
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break;
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case BOOT_MEM_ROM_DATA:
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printk(KERN_CONT "(ROM data)\n");
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break;
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case BOOT_MEM_RESERVED:
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printk(KERN_CONT "(reserved)\n");
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break;
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default:
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printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
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break;
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}
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}
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}
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/*
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* Manage initrd
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*/
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#ifdef CONFIG_BLK_DEV_INITRD
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static int __init rd_start_early(char *p)
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{
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unsigned long start = memparse(p, &p);
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#ifdef CONFIG_64BIT
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/* Guess if the sign extension was forgotten by bootloader */
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if (start < XKPHYS)
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start = (int)start;
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#endif
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initrd_start = start;
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initrd_end += start;
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return 0;
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}
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early_param("rd_start", rd_start_early);
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static int __init rd_size_early(char *p)
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{
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initrd_end += memparse(p, &p);
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return 0;
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}
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early_param("rd_size", rd_size_early);
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/* it returns the next free pfn after initrd */
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static unsigned long __init init_initrd(void)
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{
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unsigned long end;
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/*
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* Board specific code or command line parser should have
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* already set up initrd_start and initrd_end. In these cases
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* perfom sanity checks and use them if all looks good.
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*/
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if (!initrd_start || initrd_end <= initrd_start)
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goto disable;
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if (initrd_start & ~PAGE_MASK) {
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pr_err("initrd start must be page aligned\n");
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goto disable;
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}
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if (initrd_start < PAGE_OFFSET) {
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pr_err("initrd start < PAGE_OFFSET\n");
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goto disable;
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}
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/*
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* Sanitize initrd addresses. For example firmware
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* can't guess if they need to pass them through
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* 64-bits values if the kernel has been built in pure
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* 32-bit. We need also to switch from KSEG0 to XKPHYS
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* addresses now, so the code can now safely use __pa().
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*/
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end = __pa(initrd_end);
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initrd_end = (unsigned long)__va(end);
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initrd_start = (unsigned long)__va(__pa(initrd_start));
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ROOT_DEV = Root_RAM0;
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return PFN_UP(end);
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disable:
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initrd_start = 0;
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initrd_end = 0;
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return 0;
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}
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/* In some conditions (e.g. big endian bootloader with a little endian
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kernel), the initrd might appear byte swapped. Try to detect this and
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byte swap it if needed. */
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static void __init maybe_bswap_initrd(void)
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{
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#if defined(CONFIG_CPU_CAVIUM_OCTEON)
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u64 buf;
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/* Check for CPIO signature */
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if (!memcmp((void *)initrd_start, "070701", 6))
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return;
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/* Check for compressed initrd */
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if (decompress_method((unsigned char *)initrd_start, 8, NULL))
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return;
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/* Try again with a byte swapped header */
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buf = swab64p((u64 *)initrd_start);
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if (!memcmp(&buf, "070701", 6) ||
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decompress_method((unsigned char *)(&buf), 8, NULL)) {
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unsigned long i;
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pr_info("Byteswapped initrd detected\n");
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for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
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swab64s((u64 *)i);
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}
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#endif
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}
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static void __init finalize_initrd(void)
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{
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unsigned long size = initrd_end - initrd_start;
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if (size == 0) {
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printk(KERN_INFO "Initrd not found or empty");
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goto disable;
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}
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if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
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printk(KERN_ERR "Initrd extends beyond end of memory");
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goto disable;
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}
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maybe_bswap_initrd();
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reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
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initrd_below_start_ok = 1;
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pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
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initrd_start, size);
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return;
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disable:
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printk(KERN_CONT " - disabling initrd\n");
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initrd_start = 0;
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initrd_end = 0;
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}
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#else /* !CONFIG_BLK_DEV_INITRD */
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static unsigned long __init init_initrd(void)
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{
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return 0;
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}
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#define finalize_initrd() do {} while (0)
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#endif
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/*
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* Initialize the bootmem allocator. It also setup initrd related data
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* if needed.
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*/
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#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
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static void __init bootmem_init(void)
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{
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init_initrd();
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finalize_initrd();
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}
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#else /* !CONFIG_SGI_IP27 */
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static unsigned long __init bootmap_bytes(unsigned long pages)
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{
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unsigned long bytes = DIV_ROUND_UP(pages, 8);
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return ALIGN(bytes, sizeof(long));
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}
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static void __init bootmem_init(void)
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{
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unsigned long reserved_end;
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unsigned long mapstart = ~0UL;
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unsigned long bootmap_size;
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phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
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bool bootmap_valid = false;
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int i;
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/*
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* Sanity check any INITRD first. We don't take it into account
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* for bootmem setup initially, rely on the end-of-kernel-code
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* as our memory range starting point. Once bootmem is inited we
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* will reserve the area used for the initrd.
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*/
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init_initrd();
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reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
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/*
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* max_low_pfn is not a number of pages. The number of pages
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* of the system is given by 'max_low_pfn - min_low_pfn'.
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*/
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min_low_pfn = ~0UL;
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max_low_pfn = 0;
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/*
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* Find the highest page frame number we have available
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* and the lowest used RAM address
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*/
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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unsigned long start, end;
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if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
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continue;
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start = PFN_UP(boot_mem_map.map[i].addr);
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end = PFN_DOWN(boot_mem_map.map[i].addr
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+ boot_mem_map.map[i].size);
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ramstart = min(ramstart, boot_mem_map.map[i].addr);
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#ifndef CONFIG_HIGHMEM
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/*
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* Skip highmem here so we get an accurate max_low_pfn if low
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* memory stops short of high memory.
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* If the region overlaps HIGHMEM_START, end is clipped so
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* max_pfn excludes the highmem portion.
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*/
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if (start >= PFN_DOWN(HIGHMEM_START))
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continue;
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if (end > PFN_DOWN(HIGHMEM_START))
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end = PFN_DOWN(HIGHMEM_START);
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#endif
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if (end > max_low_pfn)
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max_low_pfn = end;
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if (start < min_low_pfn)
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min_low_pfn = start;
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if (end <= reserved_end)
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continue;
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#ifdef CONFIG_BLK_DEV_INITRD
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/* Skip zones before initrd and initrd itself */
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if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
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continue;
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#endif
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if (start >= mapstart)
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continue;
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mapstart = max(reserved_end, start);
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}
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/*
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* Reserve any memory between the start of RAM and PHYS_OFFSET
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*/
|
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if (ramstart > PHYS_OFFSET)
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add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
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BOOT_MEM_RESERVED);
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|
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if (min_low_pfn >= max_low_pfn)
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panic("Incorrect memory mapping !!!");
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if (min_low_pfn > ARCH_PFN_OFFSET) {
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pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
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(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
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min_low_pfn - ARCH_PFN_OFFSET);
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} else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
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pr_info("%lu free pages won't be used\n",
|
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ARCH_PFN_OFFSET - min_low_pfn);
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}
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min_low_pfn = ARCH_PFN_OFFSET;
|
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|
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/*
|
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* Determine low and high memory ranges
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*/
|
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max_pfn = max_low_pfn;
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if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
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#ifdef CONFIG_HIGHMEM
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highstart_pfn = PFN_DOWN(HIGHMEM_START);
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highend_pfn = max_low_pfn;
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#endif
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max_low_pfn = PFN_DOWN(HIGHMEM_START);
|
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}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/*
|
|
* mapstart should be after initrd_end
|
|
*/
|
|
if (initrd_end)
|
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mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
|
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#endif
|
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|
|
/*
|
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* check that mapstart doesn't overlap with any of
|
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* memory regions that have been reserved through eg. DTB
|
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*/
|
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bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
|
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|
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bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
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bootmap_size);
|
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for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
|
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unsigned long mapstart_addr;
|
|
|
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switch (boot_mem_map.map[i].type) {
|
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case BOOT_MEM_RESERVED:
|
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mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
|
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boot_mem_map.map[i].size);
|
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if (PHYS_PFN(mapstart_addr) < mapstart)
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break;
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|
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bootmap_valid = memory_region_available(mapstart_addr,
|
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bootmap_size);
|
|
if (bootmap_valid)
|
|
mapstart = PHYS_PFN(mapstart_addr);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!bootmap_valid)
|
|
panic("No memory area to place a bootmap bitmap");
|
|
|
|
/*
|
|
* Initialize the boot-time allocator with low memory only.
|
|
*/
|
|
if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
|
|
min_low_pfn, max_low_pfn))
|
|
panic("Unexpected memory size required for bootmap");
|
|
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
unsigned long start, end;
|
|
|
|
start = PFN_UP(boot_mem_map.map[i].addr);
|
|
end = PFN_DOWN(boot_mem_map.map[i].addr
|
|
+ boot_mem_map.map[i].size);
|
|
|
|
if (start <= min_low_pfn)
|
|
start = min_low_pfn;
|
|
if (start >= end)
|
|
continue;
|
|
|
|
#ifndef CONFIG_HIGHMEM
|
|
if (end > max_low_pfn)
|
|
end = max_low_pfn;
|
|
|
|
/*
|
|
* ... finally, is the area going away?
|
|
*/
|
|
if (end <= start)
|
|
continue;
|
|
#endif
|
|
|
|
memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
|
|
}
|
|
|
|
/*
|
|
* Register fully available low RAM pages with the bootmem allocator.
|
|
*/
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
unsigned long start, end, size;
|
|
|
|
start = PFN_UP(boot_mem_map.map[i].addr);
|
|
end = PFN_DOWN(boot_mem_map.map[i].addr
|
|
+ boot_mem_map.map[i].size);
|
|
|
|
/*
|
|
* Reserve usable memory.
|
|
*/
|
|
switch (boot_mem_map.map[i].type) {
|
|
case BOOT_MEM_RAM:
|
|
break;
|
|
case BOOT_MEM_INIT_RAM:
|
|
memory_present(0, start, end);
|
|
continue;
|
|
default:
|
|
/* Not usable memory */
|
|
if (start > min_low_pfn && end < max_low_pfn)
|
|
reserve_bootmem(boot_mem_map.map[i].addr,
|
|
boot_mem_map.map[i].size,
|
|
BOOTMEM_DEFAULT);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We are rounding up the start address of usable memory
|
|
* and at the end of the usable range downwards.
|
|
*/
|
|
if (start >= max_low_pfn)
|
|
continue;
|
|
if (start < reserved_end)
|
|
start = reserved_end;
|
|
if (end > max_low_pfn)
|
|
end = max_low_pfn;
|
|
|
|
/*
|
|
* ... finally, is the area going away?
|
|
*/
|
|
if (end <= start)
|
|
continue;
|
|
size = end - start;
|
|
|
|
/* Register lowmem ranges */
|
|
free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
|
|
memory_present(0, start, end);
|
|
}
|
|
|
|
/*
|
|
* Reserve the bootmap memory.
|
|
*/
|
|
reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
|
|
|
|
#ifdef CONFIG_RELOCATABLE
|
|
/*
|
|
* The kernel reserves all memory below its _end symbol as bootmem,
|
|
* but the kernel may now be at a much higher address. The memory
|
|
* between the original and new locations may be returned to the system.
|
|
*/
|
|
if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
|
|
unsigned long offset;
|
|
extern void show_kernel_relocation(const char *level);
|
|
|
|
offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
|
|
free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
|
|
|
|
#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
|
|
/*
|
|
* This information is necessary when debugging the kernel
|
|
* But is a security vulnerability otherwise!
|
|
*/
|
|
show_kernel_relocation(KERN_INFO);
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Reserve initrd memory if needed.
|
|
*/
|
|
finalize_initrd();
|
|
}
|
|
|
|
#endif /* CONFIG_SGI_IP27 */
|
|
|
|
/*
|
|
* arch_mem_init - initialize memory management subsystem
|
|
*
|
|
* o plat_mem_setup() detects the memory configuration and will record detected
|
|
* memory areas using add_memory_region.
|
|
*
|
|
* At this stage the memory configuration of the system is known to the
|
|
* kernel but generic memory management system is still entirely uninitialized.
|
|
*
|
|
* o bootmem_init()
|
|
* o sparse_init()
|
|
* o paging_init()
|
|
* o dma_contiguous_reserve()
|
|
*
|
|
* At this stage the bootmem allocator is ready to use.
|
|
*
|
|
* NOTE: historically plat_mem_setup did the entire platform initialization.
|
|
* This was rather impractical because it meant plat_mem_setup had to
|
|
* get away without any kind of memory allocator. To keep old code from
|
|
* breaking plat_setup was just renamed to plat_mem_setup and a second platform
|
|
* initialization hook for anything else was introduced.
|
|
*/
|
|
|
|
static int usermem __initdata;
|
|
|
|
static int __init early_parse_mem(char *p)
|
|
{
|
|
phys_addr_t start, size;
|
|
|
|
/*
|
|
* If a user specifies memory size, we
|
|
* blow away any automatically generated
|
|
* size.
|
|
*/
|
|
if (usermem == 0) {
|
|
boot_mem_map.nr_map = 0;
|
|
usermem = 1;
|
|
}
|
|
start = 0;
|
|
size = memparse(p, &p);
|
|
if (*p == '@')
|
|
start = memparse(p + 1, &p);
|
|
|
|
add_memory_region(start, size, BOOT_MEM_RAM);
|
|
|
|
return 0;
|
|
}
|
|
early_param("mem", early_parse_mem);
|
|
|
|
static int __init early_parse_memmap(char *p)
|
|
{
|
|
char *oldp;
|
|
u64 start_at, mem_size;
|
|
|
|
if (!p)
|
|
return -EINVAL;
|
|
|
|
if (!strncmp(p, "exactmap", 8)) {
|
|
pr_err("\"memmap=exactmap\" invalid on MIPS\n");
|
|
return 0;
|
|
}
|
|
|
|
oldp = p;
|
|
mem_size = memparse(p, &p);
|
|
if (p == oldp)
|
|
return -EINVAL;
|
|
|
|
if (*p == '@') {
|
|
start_at = memparse(p+1, &p);
|
|
add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
|
|
} else if (*p == '#') {
|
|
pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
|
|
return -EINVAL;
|
|
} else if (*p == '$') {
|
|
start_at = memparse(p+1, &p);
|
|
add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
|
|
} else {
|
|
pr_err("\"memmap\" invalid format!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (*p == '\0') {
|
|
usermem = 1;
|
|
return 0;
|
|
} else
|
|
return -EINVAL;
|
|
}
|
|
early_param("memmap", early_parse_memmap);
|
|
|
|
#ifdef CONFIG_PROC_VMCORE
|
|
unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
|
|
static int __init early_parse_elfcorehdr(char *p)
|
|
{
|
|
int i;
|
|
|
|
setup_elfcorehdr = memparse(p, &p);
|
|
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
unsigned long start = boot_mem_map.map[i].addr;
|
|
unsigned long end = (boot_mem_map.map[i].addr +
|
|
boot_mem_map.map[i].size);
|
|
if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
|
|
/*
|
|
* Reserve from the elf core header to the end of
|
|
* the memory segment, that should all be kdump
|
|
* reserved memory.
|
|
*/
|
|
setup_elfcorehdr_size = end - setup_elfcorehdr;
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* If we don't find it in the memory map, then we shouldn't
|
|
* have to worry about it, as the new kernel won't use it.
|
|
*/
|
|
return 0;
|
|
}
|
|
early_param("elfcorehdr", early_parse_elfcorehdr);
|
|
#endif
|
|
|
|
static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
|
|
{
|
|
phys_addr_t size;
|
|
int i;
|
|
|
|
size = end - mem;
|
|
if (!size)
|
|
return;
|
|
|
|
/* Make sure it is in the boot_mem_map */
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
if (mem >= boot_mem_map.map[i].addr &&
|
|
mem < (boot_mem_map.map[i].addr +
|
|
boot_mem_map.map[i].size))
|
|
return;
|
|
}
|
|
add_memory_region(mem, size, type);
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
static inline unsigned long long get_total_mem(void)
|
|
{
|
|
unsigned long long total;
|
|
|
|
total = max_pfn - min_low_pfn;
|
|
return total << PAGE_SHIFT;
|
|
}
|
|
|
|
static void __init mips_parse_crashkernel(void)
|
|
{
|
|
unsigned long long total_mem;
|
|
unsigned long long crash_size, crash_base;
|
|
int ret;
|
|
|
|
total_mem = get_total_mem();
|
|
ret = parse_crashkernel(boot_command_line, total_mem,
|
|
&crash_size, &crash_base);
|
|
if (ret != 0 || crash_size <= 0)
|
|
return;
|
|
|
|
if (!memory_region_available(crash_base, crash_size)) {
|
|
pr_warn("Invalid memory region reserved for crash kernel\n");
|
|
return;
|
|
}
|
|
|
|
crashk_res.start = crash_base;
|
|
crashk_res.end = crash_base + crash_size - 1;
|
|
}
|
|
|
|
static void __init request_crashkernel(struct resource *res)
|
|
{
|
|
int ret;
|
|
|
|
if (crashk_res.start == crashk_res.end)
|
|
return;
|
|
|
|
ret = request_resource(res, &crashk_res);
|
|
if (!ret)
|
|
pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
|
|
(unsigned long)((crashk_res.end -
|
|
crashk_res.start + 1) >> 20),
|
|
(unsigned long)(crashk_res.start >> 20));
|
|
}
|
|
#else /* !defined(CONFIG_KEXEC) */
|
|
static void __init mips_parse_crashkernel(void)
|
|
{
|
|
}
|
|
|
|
static void __init request_crashkernel(struct resource *res)
|
|
{
|
|
}
|
|
#endif /* !defined(CONFIG_KEXEC) */
|
|
|
|
#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
|
|
#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
|
|
#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
|
|
#define BUILTIN_EXTEND_WITH_PROM \
|
|
IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
|
|
|
|
static void __init arch_mem_init(char **cmdline_p)
|
|
{
|
|
struct memblock_region *reg;
|
|
extern void plat_mem_setup(void);
|
|
|
|
#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
|
|
strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
|
|
#else
|
|
if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
|
|
(USE_DTB_CMDLINE && !boot_command_line[0]))
|
|
strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
|
|
|
|
if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
|
|
if (boot_command_line[0])
|
|
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
|
|
strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
|
|
}
|
|
|
|
#if defined(CONFIG_CMDLINE_BOOL)
|
|
if (builtin_cmdline[0]) {
|
|
if (boot_command_line[0])
|
|
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
|
|
strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
|
|
}
|
|
|
|
if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
|
|
if (boot_command_line[0])
|
|
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
|
|
strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
/* call board setup routine */
|
|
plat_mem_setup();
|
|
|
|
/*
|
|
* Make sure all kernel memory is in the maps. The "UP" and
|
|
* "DOWN" are opposite for initdata since if it crosses over
|
|
* into another memory section you don't want that to be
|
|
* freed when the initdata is freed.
|
|
*/
|
|
arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
|
|
PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
|
|
BOOT_MEM_RAM);
|
|
arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
|
|
PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
|
|
BOOT_MEM_INIT_RAM);
|
|
|
|
pr_info("Determined physical RAM map:\n");
|
|
print_memory_map();
|
|
|
|
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
|
|
|
|
*cmdline_p = command_line;
|
|
|
|
parse_early_param();
|
|
|
|
if (usermem) {
|
|
pr_info("User-defined physical RAM map:\n");
|
|
print_memory_map();
|
|
}
|
|
|
|
early_init_fdt_reserve_self();
|
|
early_init_fdt_scan_reserved_mem();
|
|
|
|
bootmem_init();
|
|
#ifdef CONFIG_PROC_VMCORE
|
|
if (setup_elfcorehdr && setup_elfcorehdr_size) {
|
|
printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
|
|
setup_elfcorehdr, setup_elfcorehdr_size);
|
|
reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
|
|
BOOTMEM_DEFAULT);
|
|
}
|
|
#endif
|
|
|
|
mips_parse_crashkernel();
|
|
#ifdef CONFIG_KEXEC
|
|
if (crashk_res.start != crashk_res.end)
|
|
reserve_bootmem(crashk_res.start,
|
|
crashk_res.end - crashk_res.start + 1,
|
|
BOOTMEM_DEFAULT);
|
|
#endif
|
|
device_tree_init();
|
|
sparse_init();
|
|
plat_swiotlb_setup();
|
|
|
|
dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
|
|
/* Tell bootmem about cma reserved memblock section */
|
|
for_each_memblock(reserved, reg)
|
|
if (reg->size != 0)
|
|
reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
|
|
|
|
reserve_bootmem_region(__pa_symbol(&__nosave_begin),
|
|
__pa_symbol(&__nosave_end)); /* Reserve for hibernation */
|
|
}
|
|
|
|
static void __init resource_init(void)
|
|
{
|
|
int i;
|
|
|
|
if (UNCAC_BASE != IO_BASE)
|
|
return;
|
|
|
|
code_resource.start = __pa_symbol(&_text);
|
|
code_resource.end = __pa_symbol(&_etext) - 1;
|
|
data_resource.start = __pa_symbol(&_etext);
|
|
data_resource.end = __pa_symbol(&_edata) - 1;
|
|
bss_resource.start = __pa_symbol(&__bss_start);
|
|
bss_resource.end = __pa_symbol(&__bss_stop) - 1;
|
|
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
struct resource *res;
|
|
unsigned long start, end;
|
|
|
|
start = boot_mem_map.map[i].addr;
|
|
end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
|
|
if (start >= HIGHMEM_START)
|
|
continue;
|
|
if (end >= HIGHMEM_START)
|
|
end = HIGHMEM_START - 1;
|
|
|
|
res = alloc_bootmem(sizeof(struct resource));
|
|
|
|
res->start = start;
|
|
res->end = end;
|
|
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
|
|
switch (boot_mem_map.map[i].type) {
|
|
case BOOT_MEM_RAM:
|
|
case BOOT_MEM_INIT_RAM:
|
|
case BOOT_MEM_ROM_DATA:
|
|
res->name = "System RAM";
|
|
res->flags |= IORESOURCE_SYSRAM;
|
|
break;
|
|
case BOOT_MEM_RESERVED:
|
|
default:
|
|
res->name = "reserved";
|
|
}
|
|
|
|
request_resource(&iomem_resource, res);
|
|
|
|
/*
|
|
* We don't know which RAM region contains kernel data,
|
|
* so we try it repeatedly and let the resource manager
|
|
* test it.
|
|
*/
|
|
request_resource(res, &code_resource);
|
|
request_resource(res, &data_resource);
|
|
request_resource(res, &bss_resource);
|
|
request_crashkernel(res);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void __init prefill_possible_map(void)
|
|
{
|
|
int i, possible = num_possible_cpus();
|
|
|
|
if (possible > nr_cpu_ids)
|
|
possible = nr_cpu_ids;
|
|
|
|
for (i = 0; i < possible; i++)
|
|
set_cpu_possible(i, true);
|
|
for (; i < NR_CPUS; i++)
|
|
set_cpu_possible(i, false);
|
|
|
|
nr_cpu_ids = possible;
|
|
}
|
|
#else
|
|
static inline void prefill_possible_map(void) {}
|
|
#endif
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
cpu_probe();
|
|
mips_cm_probe();
|
|
prom_init();
|
|
|
|
setup_early_fdc_console();
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
setup_early_printk();
|
|
#endif
|
|
cpu_report();
|
|
check_bugs_early();
|
|
|
|
#if defined(CONFIG_VT)
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
conswitchp = &vga_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
|
|
arch_mem_init(cmdline_p);
|
|
|
|
resource_init();
|
|
plat_smp_setup();
|
|
prefill_possible_map();
|
|
|
|
cpu_cache_init();
|
|
paging_init();
|
|
}
|
|
|
|
unsigned long kernelsp[NR_CPUS];
|
|
unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
|
|
|
|
#ifdef CONFIG_USE_OF
|
|
unsigned long fw_passed_dtb;
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *mips_debugfs_dir;
|
|
static int __init debugfs_mips(void)
|
|
{
|
|
struct dentry *d;
|
|
|
|
d = debugfs_create_dir("mips", NULL);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
mips_debugfs_dir = d;
|
|
return 0;
|
|
}
|
|
arch_initcall(debugfs_mips);
|
|
#endif
|