sanchayanmaity/xv6-cs450
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

more named constants

Browse source
This commit is contained in:
rsc 2006-09-06 17:54:29 +00:00
parent 799c9176bc
commit 96d467b3a9
1 changed files with 10 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
ide.c
View file

@ -14,6 +14,9 @@
#define IDE_DF 0x20
#define IDE_ERR 0x01
#define IDE_CMD_READ 0x20
#define IDE_CMD_WRITE 0x30
struct ide_request {
int diskno;
uint secno;
@ -95,9 +98,10 @@ ide_start_request (void)
outb(0x1F4, (r->secno >> 8) & 0xFF);
outb(0x1F5, (r->secno >> 16) & 0xFF);
outb(0x1F6, 0xE0 | ((r->diskno&1)<<4) | ((r->secno>>24)&0x0F));
if(r->read) outb(0x1F7, 0x20); // read
if(r->read)
outb(0x1F7, IDE_CMD_READ);
else {
outb(0x1F7, 0x30); // write
outb(0x1F7, IDE_CMD_WRITE);
outsl(0x1F0, r->addr, 512/4);
}
}