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SubjectRe: include/asm-i386/checksum.h
Ok.

Sending dozens of patches today, I was asked if I could mail the whole
files, not only the patch and send it Cc'ed to you, Linus.

Here they are:
linux/include/asm-i386/checksum.h and
linux/include/asm-i386/floppy.h
both based on stable linux-2.4.5.

Well, have a lot of fun and thanks in advance!

mfg, Erik
#ifndef _I386_CHECKSUM_H
#define _I386_CHECKSUM_H


/*
* computes the checksum of a memory block at buff, length len,
* and adds in "sum" (32-bit)
*
* returns a 32-bit number suitable for feeding into itself
* or csum_tcpudp_magic
*
* this function must be called with even lengths, except
* for the last fragment, which may be odd
*
* it's best to have buff aligned on a 32-bit boundary
*/
asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);

/*
* the same as csum_partial, but copies from src while it
* checksums, and handles user-space pointer exceptions correctly, when needed.
*
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/

asmlinkage unsigned int csum_partial_copy_generic( const char *src, char *dst, int len, int sum,
int *src_err_ptr, int *dst_err_ptr);

/*
* Note: when you get a NULL pointer exception here this means someone
* passed in an incorrect kernel address to one of these functions.
*
* If you use these functions directly please don't forget the
* verify_area().
*/
extern __inline__
unsigned int csum_partial_copy_nocheck ( const char *src, char *dst,
int len, int sum)
{
return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
}

extern __inline__
unsigned int csum_partial_copy_from_user ( const char *src, char *dst,
int len, int sum, int *err_ptr)
{
return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
}

/*
* These are the old (and unsafe) way of doing checksums, a warning message will be
* printed if they are used and an exeption occurs.
*
* these functions should go away after some time.
*/

#define csum_partial_copy_fromuser csum_partial_copy
unsigned int csum_partial_copy( const char *src, char *dst, int len, int sum);

/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*
* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
* Arnt Gulbrandsen.
*/
static inline unsigned short ip_fast_csum(unsigned char * iph,
unsigned int ihl) {
unsigned int sum;

__asm__ __volatile__("\
movl (%1), %0 \
subl $4, %2 \
jbe 2f \
addl 4(%1), %0 \
adcl 8(%1), %0 \
adcl 12(%1), %0 \
1: adcl 16(%1), %0 \
lea 4(%1), %1 \
decl %2 \
jne 1b \
adcl $0, %0 \
movl %0, %2 \
shrl $16, %0 \
addw %w2, %w0 \
adcl $0, %0 \
notl %0 \
2: \
"
/* Since the input registers which are loaded with iph and ipl
are modified, we must also specify them as outputs, or gcc
will assume they contain their original values. */
: "=r" (sum), "=r" (iph), "=r" (ihl)
: "1" (iph), "2" (ihl));
return(sum);
}

/*
* Fold a partial checksum
*/

static inline unsigned int csum_fold(unsigned int sum)
{
__asm__("\
addl %1, %0 \
adcl $0xffff, %0 \
"
: "=r" (sum)
: "r" (sum << 16), "0" (sum & 0xffff0000)
);
return (~sum) >> 16;
}

static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
unsigned long daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
{
__asm__("\
addl %1, %0 \
adcl %2, %0 \
adcl %3, %0 \
adcl $0, %0 \
"
: "=r" (sum)
: "g" (daddr), "g"(saddr), "g"((ntohs(len)<<16)+proto*256), "0"(sum));
return sum;
}

/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
{
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}

/*
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/

static inline unsigned short ip_compute_csum(unsigned char * buff, int len) {
return csum_fold (csum_partial(buff, len, 0));
}

#define _HAVE_ARCH_IPV6_CSUM
static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u32 len,
unsigned short proto,
unsigned int sum)
{
__asm__("\
addl 0(%1), %0 \
adcl 4(%1), %0 \
adcl 8(%1), %0 \
adcl 12(%1), %0 \
adcl 0(%2), %0 \
adcl 4(%2), %0 \
adcl 8(%2), %0 \
adcl 12(%2), %0 \
adcl %3, %0 \
adcl %4, %0 \
adcl $0, %0 \
"
: "=&r" (sum)
: "r" (saddr), "r" (daddr),
"r"(htonl(len)), "r"(htonl(proto)), "0"(sum));

return csum_fold(sum);
}

/*
* Copy and checksum to user
*/
#define HAVE_CSUM_COPY_USER
static __inline__ unsigned int csum_and_copy_to_user (const char *src, char *dst,
int len, int sum, int *err_ptr)
{
if (access_ok(VERIFY_WRITE, dst, len))
return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);

if (len)
*err_ptr = -EFAULT;

return -1; /* invalid checksum */
}

#endif
/*
* Architecture specific parts of the Floppy driver
*
* 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
*/
#ifndef __ASM_I386_FLOPPY_H
#define __ASM_I386_FLOPPY_H

#include <linux/vmalloc.h>


/*
* The DMA channel used by the floppy controller cannot access data at
* addresses >= 16MB
*
* Went back to the 1MB limit, as some people had problems with the floppy
* driver otherwise. It doesn't matter much for performance anyway, as most
* floppy accesses go through the track buffer.
*/
#define _CROSS_64KB(a,s,vdma) \
(!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))

#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)


#define SW fd_routine[use_virtual_dma&1]
#define CSW fd_routine[can_use_virtual_dma & 1]


#define fd_inb(port) inb_p(port)
#define fd_outb(port,value) outb_p(port,value)

#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
#define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)

#define FLOPPY_CAN_FALLBACK_ON_NODMA

static int virtual_dma_count;
static int virtual_dma_residue;
static char *virtual_dma_addr;
static int virtual_dma_mode;
static int doing_pdma;

static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
{
register unsigned char st;

#undef TRACE_FLPY_INT
#define NO_FLOPPY_ASSEMBLER

#ifdef TRACE_FLPY_INT
static int calls=0;
static int bytes=0;
static int dma_wait=0;
#endif
if(!doing_pdma) {
floppy_interrupt(irq, dev_id, regs);
return;
}

#ifdef TRACE_FLPY_INT
if(!calls)
bytes = virtual_dma_count;
#endif

#ifndef NO_FLOPPY_ASSEMBLER
__asm__ (
"testl %1,%1 \
je 3f \
1: inb %w4,%b0 \
andb $160,%b0 \
cmpb $160,%b0 \
jne 2f \
incw %w4 \
testl %3,%3 \
jne 4f \
inb %w4,%b0 \
movb %0,(%2) \
jmp 5f \
4: movb (%2),%0 \
outb %b0,%w4 \
5: decw %w4 \
outb %0,$0x80 \
decl %1 \
incl %2 \
testl %1,%1 \
jne 1b \
3: inb %w4,%b0 \
2: "
: "=a" ((char) st),
"=c" ((long) virtual_dma_count),
"=S" ((long) virtual_dma_addr)
: "b" ((long) virtual_dma_mode),
"d" ((short) virtual_dma_port+4),
"1" ((long) virtual_dma_count),
"2" ((long) virtual_dma_addr));
#else
{
register int lcount;
register char *lptr;

st = 1;
for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
lcount; lcount--, lptr++) {
st=inb(virtual_dma_port+4) & 0xa0 ;
if(st != 0xa0)
break;
if(virtual_dma_mode)
outb_p(*lptr, virtual_dma_port+5);
else
*lptr = inb_p(virtual_dma_port+5);
}
virtual_dma_count = lcount;
virtual_dma_addr = lptr;
st = inb(virtual_dma_port+4);
}
#endif

#ifdef TRACE_FLPY_INT
calls++;
#endif
if(st == 0x20)
return;
if(!(st & 0x20)) {
virtual_dma_residue += virtual_dma_count;
virtual_dma_count=0;
#ifdef TRACE_FLPY_INT
printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
virtual_dma_count, virtual_dma_residue, calls, bytes,
dma_wait);
calls = 0;
dma_wait=0;
#endif
doing_pdma = 0;
floppy_interrupt(irq, dev_id, regs);
return;
}
#ifdef TRACE_FLPY_INT
if(!virtual_dma_count)
dma_wait++;
#endif
}

static void fd_disable_dma(void)
{
if(! (can_use_virtual_dma & 1))
disable_dma(FLOPPY_DMA);
doing_pdma = 0;
virtual_dma_residue += virtual_dma_count;
virtual_dma_count=0;
}

static int vdma_request_dma(unsigned int dmanr, const char * device_id)
{
return 0;
}

static void vdma_nop(unsigned int dummy)
{
}


static int vdma_get_dma_residue(unsigned int dummy)
{
return virtual_dma_count + virtual_dma_residue;
}


static int fd_request_irq(void)
{
if(can_use_virtual_dma)
return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
"floppy", NULL);
else
return request_irq(FLOPPY_IRQ, floppy_interrupt,
SA_INTERRUPT|SA_SAMPLE_RANDOM,
"floppy", NULL);

}

static unsigned long dma_mem_alloc(unsigned long size)
{
return __get_dma_pages(GFP_KERNEL,get_order(size));
}


static unsigned long vdma_mem_alloc(unsigned long size)
{
return (unsigned long) vmalloc(size);

}

#define nodma_mem_alloc(size) vdma_mem_alloc(size)

static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
{
if((unsigned int) addr >= (unsigned int) high_memory)
return vfree((void *)addr);
else
free_pages(addr, get_order(size));
}

#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)

static void _fd_chose_dma_mode(char *addr, unsigned long size)
{
if(can_use_virtual_dma == 2) {
if((unsigned int) addr >= (unsigned int) high_memory ||
virt_to_bus(addr) >= 0x1000000 ||
_CROSS_64KB(addr, size, 0))
use_virtual_dma = 1;
else
use_virtual_dma = 0;
} else {
use_virtual_dma = can_use_virtual_dma & 1;
}
}

#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)


static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
{
doing_pdma = 1;
virtual_dma_port = io;
virtual_dma_mode = (mode == DMA_MODE_WRITE);
virtual_dma_addr = addr;
virtual_dma_count = size;
virtual_dma_residue = 0;
return 0;
}

static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
{
#ifdef FLOPPY_SANITY_CHECK
if (CROSS_64KB(addr, size)) {
printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
return -1;
}
#endif
/* actual, physical DMA */
doing_pdma = 0;
clear_dma_ff(FLOPPY_DMA);
set_dma_mode(FLOPPY_DMA,mode);
set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
set_dma_count(FLOPPY_DMA,size);
enable_dma(FLOPPY_DMA);
return 0;
}

struct fd_routine_l {
int (*_request_dma)(unsigned int dmanr, const char * device_id);
void (*_free_dma)(unsigned int dmanr);
int (*_get_dma_residue)(unsigned int dummy);
unsigned long (*_dma_mem_alloc) (unsigned long size);
int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
} fd_routine[] = {
{
request_dma,
free_dma,
get_dma_residue,
dma_mem_alloc,
hard_dma_setup
},
{
vdma_request_dma,
vdma_nop,
vdma_get_dma_residue,
vdma_mem_alloc,
vdma_dma_setup
}
};


static int FDC1 = 0x3f0;
static int FDC2 = -1;

/*
* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
* coincides with another rtc CMOS user. Paul G.
*/
#define FLOPPY0_TYPE ({ \
unsigned long flags; \
unsigned char val; \
spin_lock_irqsave(&rtc_lock, flags); \
val = (CMOS_READ(0x10) >> 4) & 15; \
spin_unlock_irqrestore(&rtc_lock, flags); \
val; \
})

#define FLOPPY1_TYPE ({ \
unsigned long flags; \
unsigned char val; \
spin_lock_irqsave(&rtc_lock, flags); \
val = CMOS_READ(0x10) & 15; \
spin_unlock_irqrestore(&rtc_lock, flags); \
val; \
})

#define N_FDC 2
#define N_DRIVE 8

#define FLOPPY_MOTOR_MASK 0xf0

#define AUTO_DMA


#endif /* __ASM_I386_FLOPPY_H */
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