// SPDX-License-Identifier: GPL-2.0
/*
* arch / parisc / lib / io . c
*
* Copyright ( c ) Matthew Wilcox 2001 for Hewlett - Packard
* Copyright ( c ) Randolph Chung 2001 < tausq @ debian . org >
*
* IO accessing functions which shouldn ' t be inlined because they ' re too big
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm /io.h>
/*
* Read COUNT 8 - bit bytes from port PORT into memory starting at
* SRC .
*/
void insb (unsigned long port, void *dst, unsigned long count)
{
unsigned char *p;
p = (unsigned char *)dst;
while (((unsigned long )p) & 0 x3) {
if (!count)
return ;
count--;
*p = inb(port);
p++;
}
while (count >= 4 ) {
unsigned int w;
count -= 4 ;
w = inb(port) << 24 ;
w |= inb(port) << 16 ;
w |= inb(port) << 8 ;
w |= inb(port);
*(unsigned int *) p = w;
p += 4 ;
}
while (count) {
--count;
*p = inb(port);
p++;
}
}
/*
* Read COUNT 16 - bit words from port PORT into memory starting at
* SRC . SRC must be at least short aligned . This is used by the
* IDE driver to read disk sectors . Performance is important , but
* the interfaces seems to be slow : just using the inlined version
* of the inw ( ) breaks things .
*/
void insw (unsigned long port, void *dst, unsigned long count)
{
unsigned int l = 0 , l2;
unsigned char *p;
p = (unsigned char *)dst;
if (!count)
return ;
switch (((unsigned long )p) & 0 x3)
{
case 0 x00: /* Buffer 32-bit aligned */
while (count>=2 ) {
count -= 2 ;
l = cpu_to_le16(inw(port)) << 16 ;
l |= cpu_to_le16(inw(port));
*(unsigned int *)p = l;
p += 4 ;
}
if (count) {
*(unsigned short *)p = cpu_to_le16(inw(port));
}
break ;
case 0 x02: /* Buffer 16-bit aligned */
*(unsigned short *)p = cpu_to_le16(inw(port));
p += 2 ;
count--;
while (count>=2 ) {
count -= 2 ;
l = cpu_to_le16(inw(port)) << 16 ;
l |= cpu_to_le16(inw(port));
*(unsigned int *)p = l;
p += 4 ;
}
if (count) {
*(unsigned short *)p = cpu_to_le16(inw(port));
}
break ;
case 0 x01: /* Buffer 8-bit aligned */
case 0 x03:
/* I don't bother with 32bit transfers
* in this case, 16bit will have to do -- DE */
--count;
l = cpu_to_le16(inw(port));
*p = l >> 8 ;
p++;
while (count--)
{
l2 = cpu_to_le16(inw(port));
*(unsigned short *)p = (l & 0 xff) << 8 | (l2 >> 8 );
p += 2 ;
l = l2;
}
*p = l & 0 xff;
break ;
}
}
/*
* Read COUNT 32 - bit words from port PORT into memory starting at
* SRC . Now works with any alignment in SRC . Performance is important ,
* but the interfaces seems to be slow : just using the inlined version
* of the inl ( ) breaks things .
*/
void insl (unsigned long port, void *dst, unsigned long count)
{
unsigned int l = 0 , l2;
unsigned char *p;
p = (unsigned char *)dst;
if (!count)
return ;
switch (((unsigned long ) dst) & 0 x3)
{
case 0 x00: /* Buffer 32-bit aligned */
while (count--)
{
*(unsigned int *)p = cpu_to_le32(inl(port));
p += 4 ;
}
break ;
case 0 x02: /* Buffer 16-bit aligned */
--count;
l = cpu_to_le32(inl(port));
*(unsigned short *)p = l >> 16 ;
p += 2 ;
while (count--)
{
l2 = cpu_to_le32(inl(port));
*(unsigned int *)p = (l & 0 xffff) << 16 | (l2 >> 16 );
p += 4 ;
l = l2;
}
*(unsigned short *)p = l & 0 xffff;
break ;
case 0 x01: /* Buffer 8-bit aligned */
--count;
l = cpu_to_le32(inl(port));
*(unsigned char *)p = l >> 24 ;
p++;
*(unsigned short *)p = (l >> 8 ) & 0 xffff;
p += 2 ;
while (count--)
{
l2 = cpu_to_le32(inl(port));
*(unsigned int *)p = (l & 0 xff) << 24 | (l2 >> 8 );
p += 4 ;
l = l2;
}
*p = l & 0 xff;
break ;
case 0 x03: /* Buffer 8-bit aligned */
--count;
l = cpu_to_le32(inl(port));
*p = l >> 24 ;
p++;
while (count--)
{
l2 = cpu_to_le32(inl(port));
*(unsigned int *)p = (l & 0 xffffff) << 8 | l2 >> 24 ;
p += 4 ;
l = l2;
}
*(unsigned short *)p = (l >> 8 ) & 0 xffff;
p += 2 ;
*p = l & 0 xff;
break ;
}
}
/*
* Like insb but in the opposite direction .
* Don ' t worry as much about doing aligned memory transfers :
* doing byte reads the " slow " way isn ' t nearly as slow as
* doing byte writes the slow way ( no r - m - w cycle ) .
*/
void outsb(unsigned long port, const void * src, unsigned long count)
{
const unsigned char *p;
p = (const unsigned char *)src;
while (count) {
count--;
outb(*p, port);
p++;
}
}
/*
* Like insw but in the opposite direction . This is used by the IDE
* driver to write disk sectors . Performance is important , but the
* interfaces seems to be slow : just using the inlined version of the
* outw ( ) breaks things .
*/
void outsw (unsigned long port, const void *src, unsigned long count)
{
unsigned int l = 0 , l2;
const unsigned char *p;
p = (const unsigned char *)src;
if (!count)
return ;
switch (((unsigned long )p) & 0 x3)
{
case 0 x00: /* Buffer 32-bit aligned */
while (count>=2 ) {
count -= 2 ;
l = *(unsigned int *)p;
p += 4 ;
outw(le16_to_cpu(l >> 16 ), port);
outw(le16_to_cpu(l & 0 xffff), port);
}
if (count) {
outw(le16_to_cpu(*(unsigned short *)p), port);
}
break ;
case 0 x02: /* Buffer 16-bit aligned */
outw(le16_to_cpu(*(unsigned short *)p), port);
p += 2 ;
count--;
while (count>=2 ) {
count -= 2 ;
l = *(unsigned int *)p;
p += 4 ;
outw(le16_to_cpu(l >> 16 ), port);
outw(le16_to_cpu(l & 0 xffff), port);
}
if (count) {
outw(le16_to_cpu(*(unsigned short *)p), port);
}
break ;
case 0 x01: /* Buffer 8-bit aligned */
/* I don't bother with 32bit transfers
* in this case, 16bit will have to do -- DE */
l = *p << 8 ;
p++;
count--;
while (count)
{
count--;
l2 = *(unsigned short *)p;
p += 2 ;
outw(le16_to_cpu(l | l2 >> 8 ), port);
l = l2 << 8 ;
}
l2 = *(unsigned char *)p;
outw (le16_to_cpu(l | l2>>8 ), port);
break ;
}
}
/*
* Like insl but in the opposite direction . This is used by the IDE
* driver to write disk sectors . Works with any alignment in SRC .
* Performance is important , but the interfaces seems to be slow :
* just using the inlined version of the outl ( ) breaks things .
*/
void outsl (unsigned long port, const void *src, unsigned long count)
{
unsigned int l = 0 , l2;
const unsigned char *p;
p = (const unsigned char *)src;
if (!count)
return ;
switch (((unsigned long )p) & 0 x3)
{
case 0 x00: /* Buffer 32-bit aligned */
while (count--)
{
outl(le32_to_cpu(*(unsigned int *)p), port);
p += 4 ;
}
break ;
case 0 x02: /* Buffer 16-bit aligned */
--count;
l = *(unsigned short *)p;
p += 2 ;
while (count--)
{
l2 = *(unsigned int *)p;
p += 4 ;
outl (le32_to_cpu(l << 16 | l2 >> 16 ), port);
l = l2;
}
l2 = *(unsigned short *)p;
outl (le32_to_cpu(l << 16 | l2), port);
break ;
case 0 x01: /* Buffer 8-bit aligned */
--count;
l = *p << 24 ;
p++;
l |= *(unsigned short *)p << 8 ;
p += 2 ;
while (count--)
{
l2 = *(unsigned int *)p;
p += 4 ;
outl (le32_to_cpu(l | l2 >> 24 ), port);
l = l2 << 8 ;
}
l2 = *p;
outl (le32_to_cpu(l | l2), port);
break ;
case 0 x03: /* Buffer 8-bit aligned */
--count;
l = *p << 24 ;
p++;
while (count--)
{
l2 = *(unsigned int *)p;
p += 4 ;
outl (le32_to_cpu(l | l2 >> 8 ), port);
l = l2 << 24 ;
}
l2 = *(unsigned short *)p << 16 ;
p += 2 ;
l2 |= *p;
outl (le32_to_cpu(l | l2), port);
break ;
}
}
EXPORT_SYMBOL(insb);
EXPORT_SYMBOL(insw);
EXPORT_SYMBOL(insl);
EXPORT_SYMBOL(outsb);
EXPORT_SYMBOL(outsw);
EXPORT_SYMBOL(outsl);
Messung V0.5 in Prozent C=94 H=83 G=88
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-09-29)
¤
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