misc.c

讲述linux的初始化过程

/* $Id: misc.c,v 1.31 2000/12/14 22:57:25 davem Exp $
 * misc.c: Miscelaneous syscall emulation for Solaris
 *
 * Copyright (C) 1997,1998 Jakub Jelinek ([e-mail])
 */

#include <linux/config.h>
#include <linux/module.h> 
#include <linux/types.h>
#include <linux/smp_lock.h>
#include <linux/utsname.h>
#include <linux/limits.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/timex.h>

#include <asm/uaccess.h>
#include <asm/string.h>
#include <asm/oplib.h>
#include <asm/idprom.h>

#include "conv.h"

/* Conversion from Linux to Solaris errnos. 0-34 are identity mapped.
   Some Linux errnos (EPROCLIM, EDOTDOT, ERREMOTE, EUCLEAN, ENOTNAM, 
   ENAVAIL, EISNAM, EREMOTEIO, ENOMEDIUM, EMEDIUMTYPE) have no Solaris
   equivalents. I return EINVAL in that case, which is very wrong. If
   someone suggest a better value for them, you're welcomed.
   On the other side, Solaris ECANCELED and ENOTSUP have no Linux equivalents,
   but that doesn't matter here. --jj */
int solaris_err_table[] = {
/* 0 */  0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
/* 10 */  10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
/* 20 */  20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
/* 30 */  30, 31, 32, 33, 34, 22, 150, 149, 95, 96,
/* 40 */  97, 98, 99, 120, 121, 122, 123, 124, 125, 126, 
/* 50 */ 127, 128, 129, 130, 131, 132, 133, 134, 143, 144,
/* 60 */ 145, 146, 90, 78, 147, 148, 93, 22, 94, 49,
/* 70 */ 151, 66, 60, 62, 63, 35, 77, 36, 45, 46, 
/* 80 */ 64, 22, 67, 68, 69, 70, 71, 74, 22, 82, 
/* 90 */ 89, 92, 79, 81, 37, 38, 39, 40, 41, 42,
/* 100 */ 43, 44, 50, 51, 52, 53, 54, 55, 56, 57,
/* 110 */ 87, 61, 84, 65, 83, 80, 91, 22, 22, 22,
/* 120 */ 22, 22, 88, 86, 85, 22, 22,
};

#define SOLARIS_NR_OPEN	256

static u32 do_solaris_mmap(u32 addr, u32 len, u32 prot, u32 flags, u32 fd, u64 off)
{
	struct file *file = NULL;
	unsigned long retval, ret_type;

	/* Do we need it here? */
	set_personality(PER_SVR4);
	if (flags & MAP_NORESERVE) {
		static int cnt = 0;
		
		if (cnt < 5) {
			printk("%s:  unimplemented Solaris MAP_NORESERVE mmap() flag\n",
			       current->comm);
			cnt++;
		}
		flags &= ~MAP_NORESERVE;
	}
	retval = -EBADF;
	if(!(flags & MAP_ANONYMOUS)) {
		if(fd >= SOLARIS_NR_OPEN)
			goto out;
 		file = fget(fd);
		if (!file)
			goto out;
		else {
			struct inode * inode = file->f_dentry->d_inode;
			if(MAJOR(inode->i_rdev) == MEM_MAJOR &&
			   MINOR(inode->i_rdev) == 5) {
				flags |= MAP_ANONYMOUS;
				fput(file);
				file = NULL;
			}
		}
	}

	retval = -EINVAL;
	len = PAGE_ALIGN(len);
	if(!(flags & MAP_FIXED))
		addr = 0;
	else if (len > 0xf0000000UL || addr > 0xf0000000UL - len)
		goto out_putf;
	ret_type = flags & _MAP_NEW;
	flags &= ~_MAP_NEW;

	down(&current->mm->mmap_sem);
	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	retval = do_mmap(file,
			 (unsigned long) addr, (unsigned long) len,
			 (unsigned long) prot, (unsigned long) flags, off);
	up(&current->mm->mmap_sem);
	if(!ret_type)
		retval = ((retval < 0xf0000000) ? 0 : retval);
	                        
out_putf:
	if (file)
		fput(file);
out:
	return (u32) retval;
}

asmlinkage u32 solaris_mmap(u32 addr, u32 len, u32 prot, u32 flags, u32 fd, u32 off)
{
	return do_solaris_mmap(addr, len, prot, flags, fd, (u64) off);
}

asmlinkage u32 solaris_mmap64(struct pt_regs *regs, u32 len, u32 prot, u32 flags, u32 fd, u32 offhi)
{
	u32 offlo;
	
	if (regs->u_regs[UREG_G1]) {
		if (get_user (offlo, (u32 *)(long)((u32)regs->u_regs[UREG_I6] + 0x5c)))
			return -EFAULT;
	} else {
		if (get_user (offlo, (u32 *)(long)((u32)regs->u_regs[UREG_I6] + 0x60)))
			return -EFAULT;
	}
	return do_solaris_mmap((u32)regs->u_regs[UREG_I0], len, prot, flags, fd, (((u64)offhi)<<32)|offlo);
}

asmlinkage int solaris_brk(u32 brk)
{
	int (*sunos_brk)(u32) = (int (*)(u32))SUNOS(17);
	
	return sunos_brk(brk);
}

#define set_utsfield(to, from, dotchop, countfrom) {			\
	char *p; 							\
	int i, len = (countfrom) ? 					\
		((sizeof(to) > sizeof(from) ? 				\
			sizeof(from) : sizeof(to))) : sizeof(to); 	\
	if (copy_to_user(to, from, len))				\
		return -EFAULT;						\
	if (dotchop) 							\
		for (p=from,i=0; *p && *p != '.' && --len; p++,i++); 	\
	else 								\
		i = len - 1; 						\
	if (__put_user('\0', (char *)(to+i)))				\
		return -EFAULT;						\
}

struct sol_uname {
	char sysname[9];
	char nodename[9];
	char release[9];
	char version[9];
	char machine[9];
};

struct sol_utsname {
	char sysname[257];
	char nodename[257];
	char release[257];
	char version[257];
	char machine[257];
};

static char *machine(void)
{
	switch (sparc_cpu_model) {
	case sun4: return "sun4";
	case sun4c: return "sun4c";
	case sun4e: return "sun4e";
	case sun4m: return "sun4m";
	case sun4d: return "sun4d";
	case sun4u: return "sun4u";
	default: return "sparc";
	}
}

static char *platform(char *buffer)
{
	int len;

	*buffer = 0;
	len = prom_getproperty(prom_root_node, "name", buffer, 256);
	if(len > 0)
		buffer[len] = 0;
	if (*buffer) {
		char *p;

		for (p = buffer; *p; p++)
			if (*p == '/' || *p == ' ') *p = '_';
		return buffer;
	}

	return "sun4u";
}

static char *serial(char *buffer)
{
	int node = prom_getchild(prom_root_node);
	int len;

	node = prom_searchsiblings(node, "options");
	*buffer = 0;
	len = prom_getproperty(node, "system-board-serial#", buffer, 256);
	if(len > 0)
		buffer[len] = 0;
	if (!*buffer)
		return "4512348717234";
	else
		return buffer;
}

asmlinkage int solaris_utssys(u32 buf, u32 flags, int which, u32 buf2)
{
	switch (which) {
	case 0:	/* old uname */
		/* Let's cheat */
		set_utsfield(((struct sol_uname *)A(buf))->sysname, 
			"SunOS", 1, 0);
		down_read(&uts_sem);
		set_utsfield(((struct sol_uname *)A(buf))->nodename, 
			system_utsname.nodename, 1, 1);
		up_read(&uts_sem);
		set_utsfield(((struct sol_uname *)A(buf))->release, 
			"2.6", 0, 0);
		set_utsfield(((struct sol_uname *)A(buf))->version, 
			"Generic", 0, 0);
		set_utsfield(((struct sol_uname *)A(buf))->machine, 
			machine(), 0, 0);
		return 0;
	case 2: /* ustat */
		return -ENOSYS;
	case 3: /* fusers */
		return -ENOSYS;
	default:
		return -ENOSYS;
	}
}

asmlinkage int solaris_utsname(u32 buf)
{
	/* Why should we not lie a bit? */
	down_read(&uts_sem);
	set_utsfield(((struct sol_utsname *)A(buf))->sysname, 
			"SunOS", 0, 0);
	set_utsfield(((struct sol_utsname *)A(buf))->nodename, 
			system_utsname.nodename, 1, 1);
	set_utsfield(((struct sol_utsname *)A(buf))->release, 
			"5.6", 0, 0);
	set_utsfield(((struct sol_utsname *)A(buf))->version, 
			"Generic", 0, 0);
	set_utsfield(((struct sol_utsname *)A(buf))->machine, 
			machine(), 0, 0);
	up_read(&uts_sem);
	return 0;
}

#define SI_SYSNAME		1       /* return name of operating system */
#define SI_HOSTNAME		2       /* return name of node */
#define SI_RELEASE		3       /* return release of operating system */
#define SI_VERSION		4       /* return version field of utsname */
#define SI_MACHINE		5       /* return kind of machine */
#define SI_ARCHITECTURE		6       /* return instruction set arch */
#define SI_HW_SERIAL		7       /* return hardware serial number */
#define SI_HW_PROVIDER		8       /* return hardware manufacturer */
#define SI_SRPC_DOMAIN		9       /* return secure RPC domain */
#define SI_PLATFORM		513     /* return platform identifier */

asmlinkage int solaris_sysinfo(int cmd, u32 buf, s32 count)
{
	char *p, *q, *r;
	char buffer[256];
	int len;
	
	/* Again, we cheat :)) */
	switch (cmd) {
	case SI_SYSNAME: r = "SunOS"; break;
	case SI_HOSTNAME:
		r = buffer + 256;
		down_read(&uts_sem);
		for (p = system_utsname.nodename, q = buffer; 
		     q < r && *p && *p != '.'; *q++ = *p++);
		up_read(&uts_sem);
		*q = 0;
		r = buffer;
		break;
	case SI_RELEASE: r = "5.6"; break;
	case SI_MACHINE: r = machine(); break;
	case SI_ARCHITECTURE: r = "sparc"; break;
	case SI_HW_PROVIDER: r = "Sun_Microsystems"; break;
	case SI_HW_SERIAL: r = serial(buffer); break;
	case SI_PLATFORM: r = platform(buffer); break;
	case SI_SRPC_DOMAIN: r = ""; break;
	case SI_VERSION: r = "Generic"; break;
	default: return -EINVAL;
	}
	len = strlen(r) + 1;
	if (count < len) {
		if (copy_to_user((char *)A(buf), r, count - 1) ||
		    __put_user(0, (char *)A(buf) + count - 1))
			return -EFAULT;
	} else {
		if (copy_to_user((char *)A(buf), r, len))
			return -EFAULT;
	}
	return len;
}

#define	SOLARIS_CONFIG_NGROUPS			2
#define	SOLARIS_CONFIG_CHILD_MAX		3
#define	SOLARIS_CONFIG_OPEN_FILES		4
#define	SOLARIS_CONFIG_POSIX_VER		5
#define	SOLARIS_CONFIG_PAGESIZE			6
#define	SOLARIS_CONFIG_CLK_TCK			7
#define	SOLARIS_CONFIG_XOPEN_VER		8
#define	SOLARIS_CONFIG_PROF_TCK			10
#define	SOLARIS_CONFIG_NPROC_CONF		11
#define	SOLARIS_CONFIG_NPROC_ONLN		12
#define	SOLARIS_CONFIG_AIO_LISTIO_MAX		13
#define	SOLARIS_CONFIG_AIO_MAX			14
#define	SOLARIS_CONFIG_AIO_PRIO_DELTA_MAX	15
#define	SOLARIS_CONFIG_DELAYTIMER_MAX		16
#define	SOLARIS_CONFIG_MQ_OPEN_MAX		17
#define	SOLARIS_CONFIG_MQ_PRIO_MAX		18
#define	SOLARIS_CONFIG_RTSIG_MAX		19
#define	SOLARIS_CONFIG_SEM_NSEMS_MAX		20
#define	SOLARIS_CONFIG_SEM_VALUE_MAX		21
#define	SOLARIS_CONFIG_SIGQUEUE_MAX		22
#define	SOLARIS_CONFIG_SIGRT_MIN		23
#define	SOLARIS_CONFIG_SIGRT_MAX		24
#define	SOLARIS_CONFIG_TIMER_MAX		25
#define	SOLARIS_CONFIG_PHYS_PAGES		26
#define	SOLARIS_CONFIG_AVPHYS_PAGES		27

extern unsigned prom_cpu_nodes[NR_CPUS];

asmlinkage int solaris_sysconf(int id)
{
	switch (id) {
	case SOLARIS_CONFIG_NGROUPS:	return NGROUPS_MAX;
	case SOLARIS_CONFIG_CHILD_MAX:	return CHILD_MAX;
	case SOLARIS_CONFIG_OPEN_FILES:	return OPEN_MAX;
	case SOLARIS_CONFIG_POSIX_VER:	return 199309;
	case SOLARIS_CONFIG_PAGESIZE:	return PAGE_SIZE;
	case SOLARIS_CONFIG_XOPEN_VER:	return 3;
	case SOLARIS_CONFIG_CLK_TCK:
	case SOLARIS_CONFIG_PROF_TCK:
		return prom_getintdefault(prom_cpu_nodes[smp_processor_id()],
					  "clock-frequency", 167000000);
#ifdef CONFIG_SMP	
	case SOLARIS_CONFIG_NPROC_CONF:	return NR_CPUS;
	case SOLARIS_CONFIG_NPROC_ONLN:	return smp_num_cpus;
#else
	case SOLARIS_CONFIG_NPROC_CONF:	return 1;
	case SOLARIS_CONFIG_NPROC_ONLN:	return 1;
#endif
	case SOLARIS_CONFIG_SIGRT_MIN:		return 37;
	case SOLARIS_CONFIG_SIGRT_MAX:		return 44;
	case SOLARIS_CONFIG_PHYS_PAGES:
	case SOLARIS_CONFIG_AVPHYS_PAGES:
		{
			struct sysinfo s;
			
			si_meminfo(&s);
			if (id == SOLARIS_CONFIG_PHYS_PAGES)
				return s.totalram >>= PAGE_SHIFT;
			else
				return s.freeram >>= PAGE_SHIFT;
		}
	/* XXX support these as well -jj */
	case SOLARIS_CONFIG_AIO_LISTIO_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_AIO_MAX:		return -EINVAL;
	case SOLARIS_CONFIG_AIO_PRIO_DELTA_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_DELAYTIMER_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_MQ_OPEN_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_MQ_PRIO_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_RTSIG_MAX:		return -EINVAL;
	case SOLARIS_CONFIG_SEM_NSEMS_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_SEM_VALUE_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_SIGQUEUE_MAX:	return -EINVAL;
	case SOLARIS_CONFIG_TIMER_MAX:		return -EINVAL;
	default: return -EINVAL;