这是调用 insl 的函数。
void ide_read_buffer(unsigned char channel, unsigned char reg, unsigned int buffer,
unsigned int quads) {
/* WARNING: This code contains a serious bug. The inline assembly trashes ES and
* ESP for all of the code the compiler generates between the inline
* assembly blocks.
*/
if (reg > 0x07 && reg < 0x0C)
ide_write(channel, ATA_REG_CONTROL, 0x80 | channels[channel].nIEN);
asm("pushw %es; movw %ds, %ax; movw %ax, %es");
if (reg < 0x08)
insl(channels[channel].base + reg - 0x00, buffer, quads);
else if (reg < 0x0C)
insl(channels[channel].base + reg - 0x06, buffer, quads);
else if (reg < 0x0E)
insl(channels[channel].ctrl + reg - 0x0A, buffer, quads);
else if (reg < 0x16)
insl(channels[channel].bmide + reg - 0x0E, buffer, quads);
asm("popw %es;");
if (reg > 0x07 && reg < 0x0C)
ide_write(channel, ATA_REG_CONTROL, channels[channel].nIEN);
}