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/*
* linux/arch/i386/kernel/setup.c
*
* Copyright (C) 1995 Linus Torvalds
*/
/*
* This file handles the architecture-dependent parts of initialization
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/ldt.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/config.h>
#ifdef CONFIG_APM
#include <linux/apm_bios.h>
#endif
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blk.h>
#endif
#include <asm/segment.h>
#include <asm/system.h>
#include <asm/smp.h>
/*
* Tell us the machine setup..
*/
char hard_math = 0; /* set by kernel/head.S */
char x86 = 0; /* set by kernel/head.S to 3..6 */
char x86_model = 0; /* set by kernel/head.S */
char x86_mask = 0; /* set by kernel/head.S */
int x86_capability = 0; /* set by kernel/head.S */
int fdiv_bug = 0; /* set if Pentium(TM) with FP bug */
int pentium_f00f_bug = 0; /* set if Pentium(TM) with F00F bug */
int have_cpuid = 0; /* set if CPUID instruction works */
int has_mca_pentium = 0; /* MCA with bad pentium processor */
char x86_vendor_id[13] = "unknown";
char ignore_irq13 = 0; /* set if exception 16 works */
char wp_works_ok = -1; /* set if paging hardware honours WP */
char hlt_works_ok = 1; /* set if the "hlt" instruction works */
/*
* Bus types ..
*/
int EISA_bus = 0;
int MCA_bus = 0;
/* for MCA, but anyone else can use it if they want */
unsigned int machine_id = 0;
unsigned int machine_submodel_id = 0;
unsigned int BIOS_revision = 0;
/*
* Setup options
*/
struct drive_info_struct { char dummy[32]; } drive_info;
struct screen_info screen_info;
#ifdef CONFIG_APM
struct apm_bios_info apm_bios_info;
#endif
struct sys_desc_table_struct {
unsigned short length;
unsigned char table[0];
};
unsigned char aux_device_present;
#ifdef CONFIG_BLK_DEV_RAM
extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
extern int rd_image_start; /* starting block # of image */
#endif
extern int root_mountflags;
extern int _etext, _edata, _end;
extern char empty_zero_page[PAGE_SIZE];
/*
* This is set up by the setup-routine at boot-time
*/
#define PARAM empty_zero_page
#define EXT_MEM_K (*(unsigned short *) (PARAM+2))
#ifdef CONFIG_APM
#define APM_BIOS_INFO (*(struct apm_bios_info *) (PARAM+64))
#endif
#define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
#define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
#define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
#define RAMDISK_FLAGS (*(unsigned short *) (PARAM+0x1F8))
#define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
#define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
#define LOADER_TYPE (*(unsigned char *) (PARAM+0x210))
#define KERNEL_START (*(unsigned long *) (PARAM+0x214))
#define INITRD_START (*(unsigned long *) (PARAM+0x218))
#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c))
#define SYS_DESC_TABLE (*(struct sys_desc_table_struct*)(PARAM+0x220))
#define COMMAND_LINE ((char *) (PARAM+2048))
#define COMMAND_LINE_SIZE 256
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
static char command_line[COMMAND_LINE_SIZE] = { 0, };
char saved_command_line[COMMAND_LINE_SIZE];
void setup_arch(char **cmdline_p,
unsigned long * memory_start_p, unsigned long * memory_end_p)
{
unsigned long memory_start, memory_end;
char c = ' ', *to = command_line, *from = COMMAND_LINE;
int len = 0;
static unsigned char smptrap=0;
if(smptrap==1)
{
return;
}
smptrap=1;
ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV);
drive_info = DRIVE_INFO;
screen_info = SCREEN_INFO;
#ifdef CONFIG_APM
apm_bios_info = APM_BIOS_INFO;
#endif
if( SYS_DESC_TABLE.length != 0 ) {
MCA_bus = SYS_DESC_TABLE.table[3] &0x2;
machine_id = SYS_DESC_TABLE.table[0];
machine_submodel_id = SYS_DESC_TABLE.table[1];
BIOS_revision = SYS_DESC_TABLE.table[2];
}
aux_device_present = AUX_DEVICE_INFO;
memory_end = (1<<20) + (EXT_MEM_K<<10);
memory_end &= PAGE_MASK;
#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
#ifdef CONFIG_MAX_16M
if (memory_end > 16*1024*1024)
memory_end = 16*1024*1024;
#endif
if (!MOUNT_ROOT_RDONLY)
root_mountflags &= ~MS_RDONLY;
memory_start = (unsigned long) &_end;
init_task.mm->start_code = TASK_SIZE;
init_task.mm->end_code = TASK_SIZE + (unsigned long) &_etext;
init_task.mm->end_data = TASK_SIZE + (unsigned long) &_edata;
init_task.mm->brk = TASK_SIZE + (unsigned long) &_end;
/* Save unparsed command line copy for /proc/cmdline */
memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
for (;;) {
/*
* "mem=nopentium" disables the 4MB page tables.
* "mem=XXX[kKmM]" overrides the BIOS-reported
* memory size
*/
if (c == ' ' && *(const unsigned long *)from == *(const unsigned long *)"mem=") {
if (to != command_line) to--;
if (!memcmp(from+4, "nopentium", 9)) {
from += 9+4;
x86_capability &= ~8;
} else {
memory_end = simple_strtoul(from+4, &from, 0);
if ( *from == 'K' || *from == 'k' ) {
memory_end = memory_end << 10;
from++;
} else if ( *from == 'M' || *from == 'm' ) {
memory_end = memory_end << 20;
from++;
}
}
}
c = *(from++);
if (!c)
break;
if (COMMAND_LINE_SIZE <= ++len)
break;
*(to++) = c;
}
*to = '\0';
*cmdline_p = command_line;
*memory_start_p = memory_start;
*memory_end_p = memory_end;
#ifdef CONFIG_BLK_DEV_INITRD
if (LOADER_TYPE) {
initrd_start = INITRD_START;
initrd_end = INITRD_START+INITRD_SIZE;
if (initrd_end > memory_end) {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
initrd_end,memory_end);
initrd_start = 0;
}
}
#endif
/* request io space for devices used on all i[345]86 PC'S */
request_region(0x00,0x20,"dma1");
request_region(0x40,0x20,"timer");
request_region(0x80,0x10,"dma page reg");
request_region(0xc0,0x20,"dma2");
request_region(0xf0,0x10,"npu");
}
static const char * i486model(unsigned int nr)
{
static const char *model[] = {
"0","DX","SX","DX/2","4","SX/2","6","DX/2-WB","DX/4","DX/4-WB",
"10","11","12","13","Am5x86-WT","Am5x86-WB"
};
if (nr < sizeof(model)/sizeof(char *))
return model[nr];
return NULL;
}
static const char * i586model(unsigned int nr)
{
static const char *model[] = {
"0", "Pentium 60/66","Pentium 75+","OverDrive PODP5V83"
};
if (nr < sizeof(model)/sizeof(char *))
return model[nr];
return NULL;
}
static const char * i686model(unsigned int nr)
{
static const char *model[] = {
"PPro A-step", "Pentium Pro"
};
if (nr < sizeof(model)/sizeof(char *))
return model[nr];
return NULL;
}
static const char * getmodel(int x86, int model)
{
const char *p = NULL;
static char nbuf[12];
switch (x86) {
case 4:
p = i486model(model);
break;
case 5:
p = i586model(model);
break;
case 6:
p = i686model(model);
break;
}
if (p)
return p;
sprintf(nbuf, "%d", model);
return nbuf;
}
int get_cpuinfo(char * buffer)
{
int i, len = 0;
static const char *x86_cap_flags[] = {
"fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
"cx8", "apic", "10", "11", "mtrr", "pge", "mca", "cmov",
"16", "17", "18", "19", "20", "21", "22", "mmx",
"24", "25", "26", "27", "28", "29", "30", "31"
};
#ifdef __SMP__
int n;
#define CD(X) (cpu_data[n].X)
/* SMP has the wrong name for loops_per_sec */
#define loops_per_sec udelay_val
#define CPUN n
for ( n = 0 ; n < 32 ; n++ ) {
if ( cpu_present_map & (1<<n) ) {
if (len) buffer[len++] = '\n';
#else
#define CD(X) (X)
#define CPUN 0
#endif
len += sprintf(buffer+len,"processor\t: %d\n"
"cpu\t\t: %c86\n"
"model\t\t: %s\n"
"vendor_id\t: %s\n",
CPUN,
CD(x86)+'0',
CD(have_cpuid) ?
getmodel(CD(x86), CD(x86_model)) :
"unknown",
CD(x86_vendor_id));
if (CD(x86_mask))
len += sprintf(buffer+len,
"stepping\t: %d\n",
CD(x86_mask));
else
len += sprintf(buffer+len,
"stepping\t: unknown\n");
len += sprintf(buffer+len,
"fdiv_bug\t: %s\n"
"hlt_bug\t\t: %s\n"
"f00f_bug\t: %s\n"
"fpu\t\t: %s\n"
"fpu_exception\t: %s\n"
"cpuid\t\t: %s\n"
"wp\t\t: %s\n"
"flags\t\t:",
CD(fdiv_bug) ? "yes" : "no",
CD(hlt_works_ok) ? "no" : "yes",
pentium_f00f_bug ? "yes" : "no",
CD(hard_math) ? "yes" : "no",
(CD(hard_math) && ignore_irq13)
? "yes" : "no",
CD(have_cpuid) ? "yes" : "no",
CD(wp_works_ok) ? "yes" : "no");
for ( i = 0 ; i < 32 ; i++ ) {
if ( CD(x86_capability) & (1 << i) ) {
len += sprintf(buffer+len, " %s",
x86_cap_flags[i]);
}
}
len += sprintf(buffer+len,
"\nbogomips\t: %lu.%02lu\n",
CD(loops_per_sec+2500)/500000,
(CD(loops_per_sec+2500)/5000) % 100);
#ifdef __SMP__
}
}
#endif
return len;
}
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