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setup.c 13.71 KiB
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 1995 Waldorf Electronics
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
* Copyright (C) 1996 Stoned Elipot
* Copyright (C) 1999 Silicon Graphics, Inc.
* Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
*/
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/screen_info.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/console.h>
#include <linux/pfn.h>
#include <linux/debugfs.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/bugs.h>
#include <asm/cache.h>
#include <asm/cpu.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/smp-ops.h>
#include <asm/system.h>
struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_data);
#ifdef CONFIG_VT
struct screen_info screen_info;
#endif
/*
* Despite it's name this variable is even if we don't have PCI
*/
unsigned int PCI_DMA_BUS_IS_PHYS;
EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
/*
* Setup information
*
* These are initialized so they are in the .data section
*/
unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
EXPORT_SYMBOL(mips_machtype);
struct boot_mem_map boot_mem_map;
static char command_line[CL_SIZE];
char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
/*
* mips_io_port_base is the begin of the address space to which x86 style
* I/O ports are mapped.
*/
const unsigned long mips_io_port_base __read_mostly = -1;
EXPORT_SYMBOL(mips_io_port_base);
static struct resource code_resource = { .name = "Kernel code", };
static struct resource data_resource = { .name = "Kernel data", };
void __init add_memory_region(phys_t start, phys_t size, long type)
{
int x = boot_mem_map.nr_map;
struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
/* Sanity check */
if (start + size < start) {
pr_warning("Trying to add an invalid memory region, skipped\n");
return;
}
/*
* Try to merge with previous entry if any. This is far less than
* perfect but is sufficient for most real world cases.
*/
if (x && prev->addr + prev->size == start && prev->type == type) {
prev->size += size;
return;
}
if (x == BOOT_MEM_MAP_MAX) {
pr_err("Ooops! Too many entries in the memory map!\n");
return;
}
boot_mem_map.map[x].addr = start;
boot_mem_map.map[x].size = size;
boot_mem_map.map[x].type = type;
boot_mem_map.nr_map++;
}
static void __init print_memory_map(void)
{
int i;
const int field = 2 * sizeof(unsigned long);
for (i = 0; i < boot_mem_map.nr_map; i++) {
printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
field, (unsigned long long) boot_mem_map.map[i].size,
field, (unsigned long long) boot_mem_map.map[i].addr);
switch (boot_mem_map.map[i].type) {
case BOOT_MEM_RAM:
printk(KERN_CONT "(usable)\n");
break;
case BOOT_MEM_ROM_DATA:
printk(KERN_CONT "(ROM data)\n");
break;
case BOOT_MEM_RESERVED:
printk(KERN_CONT "(reserved)\n");
break;
default:
printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
break;
}
}
}
/*
* Manage initrd
*/
#ifdef CONFIG_BLK_DEV_INITRD
static int __init rd_start_early(char *p)
{
unsigned long start = memparse(p, &p);
#ifdef CONFIG_64BIT
/* Guess if the sign extension was forgotten by bootloader */
if (start < XKPHYS)
start = (int)start;
#endif
initrd_start = start;
initrd_end += start;
return 0;
}
early_param("rd_start", rd_start_early);
static int __init rd_size_early(char *p)
{
initrd_end += memparse(p, &p);
return 0;
}
early_param("rd_size", rd_size_early);
/* it returns the next free pfn after initrd */
static unsigned long __init init_initrd(void)
{
unsigned long end;
/*
* Board specific code or command line parser should have
* already set up initrd_start and initrd_end. In these cases
* perfom sanity checks and use them if all looks good.
*/
if (!initrd_start || initrd_end <= initrd_start) {
#ifdef CONFIG_PROBE_INITRD_HEADER
u32 *initrd_header;
/*
* See if initrd has been added to the kernel image by
* arch/mips/boot/addinitrd.c. In that case a header is
* prepended to initrd and is made up by 8 bytes. The first
* word is a magic number and the second one is the size of
* initrd. Initrd start must be page aligned in any cases.
*/
initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
if (initrd_header[0] != 0x494E5244)
goto disable;
initrd_start = (unsigned long)(initrd_header + 2);
initrd_end = initrd_start + initrd_header[1];
#else
goto disable;
#endif
}
if (initrd_start & ~PAGE_MASK) {
pr_err("initrd start must be page aligned\n");
goto disable;
}
if (initrd_start < PAGE_OFFSET) {
pr_err("initrd start < PAGE_OFFSET\n");
goto disable;
}
/*
* Sanitize initrd addresses. For example firmware
* can't guess if they need to pass them through
* 64-bits values if the kernel has been built in pure
* 32-bit. We need also to switch from KSEG0 to XKPHYS
* addresses now, so the code can now safely use __pa().
*/
end = __pa(initrd_end);
initrd_end = (unsigned long)__va(end);
initrd_start = (unsigned long)__va(__pa(initrd_start));
ROOT_DEV = Root_RAM0; return PFN_UP(end);
disable:
initrd_start = 0;
initrd_end = 0;
return 0;
}
static void __init finalize_initrd(void)
{
unsigned long size = initrd_end - initrd_start;
if (size == 0) {
printk(KERN_INFO "Initrd not found or empty");
goto disable;
}
if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
printk(KERN_ERR "Initrd extends beyond end of memory");
goto disable;
}
reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
initrd_below_start_ok = 1;
pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
initrd_start, size);
return;
disable:
printk(KERN_CONT " - disabling initrd\n");
initrd_start = 0;
initrd_end = 0;
}
#else /* !CONFIG_BLK_DEV_INITRD */
static unsigned long __init init_initrd(void)
{
return 0;
}
#define finalize_initrd() do {} while (0)
#endif
/*
* Initialize the bootmem allocator. It also setup initrd related data
* if needed.
*/
#ifdef CONFIG_SGI_IP27
static void __init bootmem_init(void)
{
init_initrd();
finalize_initrd();
}
#else /* !CONFIG_SGI_IP27 */
static void __init bootmem_init(void)
{
unsigned long reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
int i;
/*
* Init any data related to initrd. It's a nop if INITRD is
* not selected. Once that done we can determine the low bound
* of usable memory.
*/
reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));
/*
* max_low_pfn is not a number of pages. The number of pages
* of the system is given by 'max_low_pfn - min_low_pfn'.
*/
min_low_pfn = ~0UL;
max_low_pfn = 0;
/*
* Find the highest page frame number we have available.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
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 (end > max_low_pfn)
max_low_pfn = end;
if (start < min_low_pfn)
min_low_pfn = start;
if (end <= reserved_end)
continue;
if (start >= mapstart)
continue;
mapstart = max(reserved_end, start);
}
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > ARCH_PFN_OFFSET) {
pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
min_low_pfn - ARCH_PFN_OFFSET);
} else if (min_low_pfn < ARCH_PFN_OFFSET) {
pr_info("%lu free pages won't be used\n",
ARCH_PFN_OFFSET - min_low_pfn);
}
min_low_pfn = ARCH_PFN_OFFSET;
/*
* Determine low and high memory ranges
*/
max_pfn = max_low_pfn;
if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
highstart_pfn = PFN_DOWN(HIGHMEM_START);
highend_pfn = max_low_pfn;
#endif
max_low_pfn = PFN_DOWN(HIGHMEM_START);
}
/*
* Initialize the boot-time allocator with low memory only.
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
min_low_pfn, max_low_pfn);
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
add_active_range(0, start, end);
}
/*
* 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;
/*
* Reserve usable memory.
*/
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
/*
* 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);
/*
* 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()
*
* 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_setup and a second platform
* initialization hook for anything else was introduced.
*/
static int usermem __initdata = 0;
static int __init early_parse_mem(char *p)
{
unsigned long 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 void __init arch_mem_init(char **cmdline_p)
{
extern void plat_mem_setup(void);
/* call board setup routine */
plat_mem_setup();
pr_info("Determined physical RAM map:\n");
print_memory_map();
strlcpy(command_line, arcs_cmdline, sizeof(command_line));
strlcpy(boot_command_line, 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();
}
bootmem_init(); sparse_init();
paging_init();
}
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;
/*
* Request address space for all standard RAM.
*/
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));
switch (boot_mem_map.map[i].type) {
case BOOT_MEM_RAM:
case BOOT_MEM_ROM_DATA:
res->name = "System RAM";
break;
case BOOT_MEM_RESERVED:
default:
res->name = "reserved";
}
res->start = start;
res->end = end;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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);
}
}
void __init setup_arch(char **cmdline_p)
{
cpu_probe();
prom_init();
#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();
}
static int __init fpu_disable(char *s)
{
int i;
for (i = 0; i < NR_CPUS; i++)
cpu_data[i].options &= ~MIPS_CPU_FPU;
return 1;
}
__setup("nofpu", fpu_disable);
static int __init dsp_disable(char *s)
{
cpu_data[0].ases &= ~MIPS_ASE_DSP;
return 1;
}
__setup("nodsp", dsp_disable);
unsigned long kernelsp[NR_CPUS];
unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
#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 (IS_ERR(d))
return PTR_ERR(d);
mips_debugfs_dir = d;
return 0;
}
arch_initcall(debugfs_mips);
#endif