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/*
* linux/arch/mips/kernel/setup.c
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 1995, 1996 Ralf Baechle
* Copyright (C) 1996 Stoned Elipot
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/user.h>
#include <linux/utsname.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blk.h>
#endif
#ifdef CONFIG_RTC
#include <linux/ioport.h>
#include <linux/timex.h>
#endif
#include <asm/asm.h>
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/io.h>
#include <asm/vector.h>
#include <asm/stackframe.h>
#include <asm/system.h>
#ifdef CONFIG_SGI
#include <asm/sgialib.h>
#endif
/*
* How to handle the machine's features
*/
struct feature *feature;
/*
* What to do to keep the caches consistent with memory
* We don't use the normal cacheflush routine to keep Tyne caches happier.
*/
void (*fd_cacheflush)(const void *addr, size_t size);
/*
* Not all of the MIPS CPUs have the "wait" instruction available. This
* is set to true if it is available. The wait instruction stops the
* pipeline and reduces the power consumption of the CPU very much.
*/
char wait_available;
/*
* There are several bus types available for MIPS machines. "RISC PC"
* type machines have ISA, EISA or PCI available, some DECstations have
* Turbochannel, SGI has GIO, there are lots of VME boxes ...
* This flag is set if a EISA slots are available.
*/
int EISA_bus = 0;
/*
* Milo passes some information to the kernel that looks like as if it
* had been returned by a Intel PC BIOS. Milo doesn't fill the passed
* drive_info and Linux can find out about this anyway, so I'm going to
* remove this sometime. screen_info contains information about the
* resolution of the text screen. For VGA graphics based machine this
* information is being use to continue the screen output just below
* the BIOS printed text and with the same text resolution.
*/
struct drive_info_struct drive_info = DEFAULT_DRIVE_INFO;
struct screen_info screen_info = DEFAULT_SCREEN_INFO;
/*
* setup informations
*
* These are intialized so they are in the .data section
*/
unsigned long mips_memory_upper = KSEG0; /* this is set by kernel_entry() */
unsigned long mips_cputype = CPU_UNKNOWN;
unsigned long mips_machtype = MACH_UNKNOWN;
unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
unsigned long mips_tlb_entries = 48; /* Guess which CPU I've got :) */
unsigned long mips_vram_base = KSEG0;
unsigned char aux_device_present;
extern int root_mountflags;
extern int _end;
extern char empty_zero_page[PAGE_SIZE];
/*
* This is set up by the setup-routine at boot-time
*/
#define PARAM empty_zero_page
#if 0
#define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
#define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
#endif
#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))
static char command_line[CL_SIZE] = { 0, };
char saved_command_line[CL_SIZE];
/*
* The board specific setup routine sets irq_setup to point to a board
* specific setup routine.
*/
void (*irq_setup)(void);
/*
* isa_slot_offset is the address where E(ISA) busaddress 0 is is mapped
* for the processor.
*/
unsigned long isa_slot_offset;
static void default_irq_setup(void)
{
panic("Unknown machtype in init_IRQ");
}
static void default_fd_cacheflush(const void *addr, size_t size)
{
}
void setup_arch(char **cmdline_p,
unsigned long * memory_start_p, unsigned long * memory_end_p)
{
unsigned long memory_end;
tag* atag;
void decstation_setup(void);
void deskstation_setup(void);
void jazz_setup(void);
void sni_rm200_pci_setup(void);
void sgi_setup(void);
/* Perhaps a lot of tags are not getting 'snarfed' - */
/* please help yourself */
atag = bi_TagFind(tag_machtype);
memcpy(&mips_machtype, TAGVALPTR(atag), atag->size);
atag = bi_TagFind(tag_machgroup);
memcpy(&mips_machgroup, TAGVALPTR(atag), atag->size);
atag = bi_TagFind(tag_vram_base);
memcpy(&mips_vram_base, TAGVALPTR(atag), atag->size);
irq_setup = default_irq_setup;
fd_cacheflush = default_fd_cacheflush;
switch(mips_machgroup)
{
#ifdef CONFIG_MIPS_DECSTATION
case MACH_GROUP_DEC:
decstation_setup();
break;
#endif
#if defined(CONFIG_MIPS_ARC)
/* Perhaps arch/mips/deskstation should be renommed arch/mips/arc.
* For now CONFIG_MIPS_ARC means DeskStation. -Stoned.
*/
case MACH_GROUP_ARC:
deskstation_setup();
break;
#endif
#ifdef CONFIG_MIPS_JAZZ
case MACH_GROUP_JAZZ:
jazz_setup();
break;
#endif
#ifdef CONFIG_SGI
case MACH_GROUP_SGI:
sgi_setup();
break;
#endif
#ifdef CONFIG_SNI_RM200_PCI
case MACH_GROUP_SNI_RM:
sni_rm200_pci_setup();
break;
#endif
default:
panic("Unsupported architecture");
}
atag = bi_TagFind(tag_drive_info);
memcpy(&drive_info, TAGVALPTR(atag), atag->size);
#if 0
aux_device_present = AUX_DEVICE_INFO;
#endif
memory_end = mips_memory_upper;
/*
* Due to prefetching and similar mechanism the CPU sometimes
* generates addresses beyond the end of memory. We leave the size
* of one cache line at the end of memory unused to make shure we
* don't catch this type of bus errors.
*/
memory_end -= 128;
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
atag = bi_TagFind(tag_mount_root_rdonly);
if (atag)
root_mountflags |= MS_RDONLY;
atag = bi_TagFind(tag_command_line);
if (atag)
memcpy(&command_line, TAGVALPTR(atag), atag->size);
memcpy(saved_command_line, command_line, CL_SIZE);
saved_command_line[CL_SIZE-1] = '\0';
*cmdline_p = command_line;
*memory_start_p = (unsigned long) &_end;
*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
}
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