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- /*
- * linux/arch/i386/kernel/setup.c
- *
- * Copyright (C) 1995 Linus Torvalds
- */
-
- /*
- * This file handles the architecture-dependent parts of process handling..
- */
-
- #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 <asm/segment.h>
- #include <asm/system.h>
-
- /*
- * Tell us the machine setup..
- */
- char hard_math = 0; /* set by boot/head.S */
- char x86 = 0; /* set by boot/head.S to 3 or 4 */
- char x86_model = 0; /* set by boot/head.S */
- char x86_mask = 0; /* set by boot/head.S */
- int x86_capability = 0; /* set by boot/head.S */
- int fdiv_bug = 0; /* set if Pentium(TM) with FP bug */
-
- char x86_vendor_id[13] = "Unknown";
-
- char ignore_irq13 = 0; /* set if exception 16 works */
- char wp_works_ok = 0; /* set if paging hardware honours WP */
- char hlt_works_ok = 1; /* set if the "hlt" instruction works */
-
- /*
- * Bus types ..
- */
- int EISA_bus = 0;
-
- /*
- * Setup options
- */
- struct drive_info_struct { char dummy[32]; } drive_info;
- struct screen_info screen_info;
-
- unsigned char aux_device_present;
- extern int ramdisk_size;
- 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))
- #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_SIZE (*(unsigned short *) (PARAM+0x1F8))
- #define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
- #define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
- #define COMMAND_LINE ((char *) (PARAM+2048))
- #define COMMAND_LINE_SIZE 256
-
- static char command_line[COMMAND_LINE_SIZE] = { 0, };
-
- 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;
-
- ROOT_DEV = ORIG_ROOT_DEV;
- drive_info = DRIVE_INFO;
- screen_info = SCREEN_INFO;
- aux_device_present = AUX_DEVICE_INFO;
- memory_end = (1<<20) + (EXT_MEM_K<<10);
- memory_end &= PAGE_MASK;
- ramdisk_size = RAMDISK_SIZE;
- #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;
-
- for (;;) {
- if (c == ' ' && *(unsigned long *)from == *(unsigned long *)"mem=") {
- 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;
- /* 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(0x70,0x10,"rtc");
- request_region(0x80,0x20,"dma page reg");
- request_region(0xc0,0x20,"dma2");
- request_region(0xf0,0x2,"npu");
- request_region(0xf8,0x8,"npu");
- }
-