Messages in this thread | | | Date | Tue, 3 Jul 2001 21:16:35 +0200 (CEST) | From | Erik Meusel <> | Subject | Re: include/asm-i386/checksum.h |
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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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