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linux/arch/mips/kernel/setup.c
Dave Hansen 22a9835c35 [PATCH] unify PFN_* macros 
Just about every architecture defines some macros to do operations on pfns.
 They're all virtually identical.  This patch consolidates all of them.

One minor glitch is that at least i386 uses them in a very skeletal header
file.  To keep away from #include dependency hell, I stuck the new
definitions in a new, isolated header.

Of all of the implementations, sh64 is the only one that varied by a bit.
It used some masks to ensure that any sign-extension got ripped away before
the arithmetic is done.  This has been posted to that sh64 maintainers and
the development list.

Compiles on x86, x86_64, ia64 and ppc64.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 08:44:48 -08:00

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/*
* 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 Maciej W. Rozycki
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/utsname.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/major.h>
#include <linux/kdev_t.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/console.h>
#include <linux/mmzone.h>
#include <linux/pfn.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/cache.h>
#include <asm/cpu.h>
#include <asm/sections.h>
#include <asm/setup.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;
unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
EXPORT_SYMBOL(mips_machtype);
EXPORT_SYMBOL(mips_machgroup);
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);
/*
* isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
* for the processor.
*/
unsigned long isa_slot_offset;
EXPORT_SYMBOL(isa_slot_offset);
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;
/*
* 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) {
printk("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(" 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("(usable)\n");
break;
case BOOT_MEM_ROM_DATA:
printk("(ROM data)\n");
break;
case BOOT_MEM_RESERVED:
printk("(reserved)\n");
break;
default:
printk("type %lu\n", boot_mem_map.map[i].type);
break;
}
}
}
static inline void parse_cmdline_early(void)
{
char c = ' ', *to = command_line, *from = saved_command_line;
unsigned long start_at, mem_size;
int len = 0;
int usermem = 0;
printk("Determined physical RAM map:\n");
print_memory_map();
for (;;) {
/*
* "mem=XXX[kKmM]" defines a memory region from
* 0 to <XXX>, overriding the determined size.
* "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
* <YYY> to <YYY>+<XXX>, overriding the determined size.
*/
if (c == ' ' && !memcmp(from, "mem=", 4)) {
if (to != command_line)
to--;
/*
* If a user specifies memory size, we
* blow away any automatically generated
* size.
*/
if (usermem == 0) {
boot_mem_map.nr_map = 0;
usermem = 1;
}
mem_size = memparse(from + 4, &from);
if (*from == '@')
start_at = memparse(from + 1, &from);
else
start_at = 0;
add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
}
c = *(from++);
if (!c)
break;
if (CL_SIZE <= ++len)
break;
*(to++) = c;
}
*to = '\0';
if (usermem) {
printk("User-defined physical RAM map:\n");
print_memory_map();
}
}
static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
{
/*
* "rd_start=0xNNNNNNNN" defines the memory address of an initrd
* "rd_size=0xNN" it's size
*/
unsigned long start = 0;
unsigned long size = 0;
unsigned long end;
char cmd_line[CL_SIZE];
char *start_str;
char *size_str;
char *tmp;
strcpy(cmd_line, command_line);
*command_line = 0;
tmp = cmd_line;
/* Ignore "rd_start=" strings in other parameters. */
start_str = strstr(cmd_line, "rd_start=");
if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
start_str = strstr(start_str, " rd_start=");
while (start_str) {
if (start_str != cmd_line)
strncat(command_line, tmp, start_str - tmp);
start = memparse(start_str + 9, &start_str);
tmp = start_str + 1;
start_str = strstr(start_str, " rd_start=");
}
if (*tmp)
strcat(command_line, tmp);
strcpy(cmd_line, command_line);
*command_line = 0;
tmp = cmd_line;
/* Ignore "rd_size" strings in other parameters. */
size_str = strstr(cmd_line, "rd_size=");
if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
size_str = strstr(size_str, " rd_size=");
while (size_str) {
if (size_str != cmd_line)
strncat(command_line, tmp, size_str - tmp);
size = memparse(size_str + 8, &size_str);
tmp = size_str + 1;
size_str = strstr(size_str, " rd_size=");
}
if (*tmp)
strcat(command_line, tmp);
#ifdef CONFIG_64BIT
/* HACK: Guess if the sign extension was forgotten */
if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
start |= 0xffffffff00000000;
#endif
end = start + size;
if (start && end) {
*rd_start = start;
*rd_end = end;
return 1;
}
return 0;
}
#define MAXMEM HIGHMEM_START
#define MAXMEM_PFN PFN_DOWN(MAXMEM)
static inline void bootmem_init(void)
{
unsigned long start_pfn;
unsigned long reserved_end = (unsigned long)&_end;
#ifndef CONFIG_SGI_IP27
unsigned long first_usable_pfn;
unsigned long bootmap_size;
int i;
#endif
#ifdef CONFIG_BLK_DEV_INITRD
int initrd_reserve_bootmem = 0;
/* Board specific code should have set up initrd_start and initrd_end */
ROOT_DEV = Root_RAM0;
if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
reserved_end = max(reserved_end, initrd_end);
initrd_reserve_bootmem = 1;
} else {
unsigned long tmp;
u32 *initrd_header;
tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
if (tmp < reserved_end)
tmp += PAGE_SIZE;
initrd_header = (u32 *)tmp;
if (initrd_header[0] == 0x494E5244) {
initrd_start = (unsigned long)&initrd_header[2];
initrd_end = initrd_start + initrd_header[1];
reserved_end = max(reserved_end, initrd_end);
initrd_reserve_bootmem = 1;
}
}
#endif /* CONFIG_BLK_DEV_INITRD */
/*
* Partially used pages are not usable - thus
* we are rounding upwards.
*/
start_pfn = PFN_UP(CPHYSADDR(reserved_end));
#ifndef CONFIG_SGI_IP27
/* Find the highest page frame number we have available. */
max_pfn = 0;
first_usable_pfn = -1UL;
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 (start >= end)
continue;
if (end > max_pfn)
max_pfn = end;
if (start < first_usable_pfn) {
if (start > start_pfn) {
first_usable_pfn = start;
} else if (end > start_pfn) {
first_usable_pfn = start_pfn;
}
}
}
/*
* Determine low and high memory ranges
*/
max_low_pfn = max_pfn;
if (max_low_pfn > MAXMEM_PFN) {
max_low_pfn = MAXMEM_PFN;
#ifndef CONFIG_HIGHMEM
/* Maximum memory usable is what is directly addressable */
printk(KERN_WARNING "Warning only %ldMB will be used.\n",
MAXMEM >> 20);
printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
#endif
}
#ifdef CONFIG_HIGHMEM
/*
* Crude, we really should make a better attempt at detecting
* highstart_pfn
*/
highstart_pfn = highend_pfn = max_pfn;
if (max_pfn > MAXMEM_PFN) {
highstart_pfn = MAXMEM_PFN;
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
(highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
}
#endif
memory_present(0, first_usable_pfn, max_low_pfn);
/* Initialize the boot-time allocator with low memory only. */
bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long curr_pfn, last_pfn, size;
/*
* Reserve usable memory.
*/
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
/*
* We are rounding up the start address of usable memory:
*/
curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
if (curr_pfn >= max_low_pfn)
continue;
if (curr_pfn < start_pfn)
curr_pfn = start_pfn;
/*
* ... and at the end of the usable range downwards:
*/
last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (last_pfn > max_low_pfn)
last_pfn = max_low_pfn;
/*
* Only register lowmem part of lowmem segment with bootmem.
*/
size = last_pfn - curr_pfn;
if (curr_pfn > PFN_DOWN(HIGHMEM_START))
continue;
if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
if (!size)
continue;
/*
* ... finally, did all the rounding and playing
* around just make the area go away?
*/
if (last_pfn <= curr_pfn)
continue;
/* Register lowmem ranges */
free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
}
/* Reserve the bootmap memory. */
reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
#endif /* CONFIG_SGI_IP27 */
#ifdef CONFIG_BLK_DEV_INITRD
initrd_below_start_ok = 1;
if (initrd_start) {
unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
(void *)initrd_start, initrd_size);
if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
printk("initrd extends beyond end of memory "
"(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
sizeof(long) * 2,
(unsigned long long)CPHYSADDR(initrd_end),
sizeof(long) * 2,
(unsigned long long)PFN_PHYS(max_low_pfn));
initrd_start = initrd_end = 0;
initrd_reserve_bootmem = 0;
}
if (initrd_reserve_bootmem)
reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
}
#endif /* CONFIG_BLK_DEV_INITRD */
}
static inline void resource_init(void)
{
int i;
code_resource.start = virt_to_phys(&_text);
code_resource.end = virt_to_phys(&_etext) - 1;
data_resource.start = virt_to_phys(&_etext);
data_resource.end = virt_to_phys(&_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 >= MAXMEM)
continue;
if (end >= MAXMEM)
end = MAXMEM - 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);
}
}
#undef MAXMEM
#undef MAXMEM_PFN
extern void plat_setup(void);
void __init setup_arch(char **cmdline_p)
{
cpu_probe();
prom_init();
cpu_report();
#if defined(CONFIG_VT)
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
#endif
/* call board setup routine */
plat_setup();
strlcpy(command_line, arcs_cmdline, sizeof(command_line));
strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
parse_cmdline_early();
bootmem_init();
sparse_init();
paging_init();
resource_init();
#ifdef CONFIG_SMP
plat_smp_setup();
#endif
}
int __init fpu_disable(char *s)
{
cpu_data[0].options &= ~MIPS_CPU_FPU;
return 1;
}
__setup("nofpu", fpu_disable);
int __init dsp_disable(char *s)
{
cpu_data[0].ases &= ~MIPS_ASE_DSP;
return 1;
}
__setup("nodsp", dsp_disable);
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