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#include <u.h>
#include </386/include/ureg.h>
#include <libc.h>
#include <aml.h>
int fd, iofd;
struct Ureg u;
ulong PM1a_CNT_BLK, PM1b_CNT_BLK, SLP_TYPa, SLP_TYPb;
enum {
SLP_EN = 0x2000,
SLP_TM = 0x1c00,
};
typedef struct Tbl Tbl;
struct Tbl {
uchar sig[4];
uchar len[4];
uchar rev;
uchar csum;
uchar oemid[6];
uchar oemtid[8];
uchar oemrev[4];
uchar cid[4];
uchar crev[4];
uchar data[];
};
enum {
Tblsz = 4+4+1+1+6+8+4+4+4,
};
static ulong
get32(uchar *p){
return p[3]<<24 | p[2]<<16 | p[1]<<8 | p[0];
}
void
apm(void)
{
seek(fd, 0, 0);
if(write(fd, &u, sizeof u) < 0)
sysfatal("write: %r");
seek(fd, 0, 0);
if(read(fd, &u, sizeof u) < 0)
sysfatal("read: %r");
if(u.flags & 1)
sysfatal("apm: %lux", (u.ax>>8) & 0xFF);
}
int
loadacpi(void)
{
void *r, **rr;
ulong l;
Tbl *t;
int n;
amlinit();
for(;;){
t = malloc(sizeof(*t));
if((n = readn(fd, t, Tblsz)) <= 0)
break;
if(n != Tblsz)
return -1;
l = get32(t->len);
if(l < Tblsz)
return -1;
l -= Tblsz;
t = realloc(t, sizeof(*t) + l);
if(readn(fd, t->data, l) != l)
return -1;
if(memcmp("DSDT", t->sig, 4) == 0)
amlload(t->data, l);
else if(memcmp("SSDT", t->sig, 4) == 0)
amlload(t->data, l);
else if(memcmp("FACP", t->sig, 4) == 0){
PM1a_CNT_BLK = get32(((uchar*)t) + 64);
PM1b_CNT_BLK = get32(((uchar*)t) + 68);
}
}
if(amleval(amlwalk(amlroot, "_S5"), "", &r) < 0)
return -1;
if(amltag(r) != 'p' || amllen(r) < 2)
return -1;
rr = amlval(r);
SLP_TYPa = amlint(rr[0]);
SLP_TYPb = amlint(rr[1]);
return 0;
}
void
outw(long addr, ushort val)
{
uchar buf[2];
if(addr == 0)
return;
buf[0] = val;
buf[1] = val >> 8;
pwrite(iofd, buf, 2, addr);
}
void
wirecpu0(void)
{
char buf[128];
int ctl;
snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());
if((ctl = open(buf, OWRITE)) < 0){
snprint(buf, sizeof(buf), "#p/%d/ctl", getpid());
if((ctl = open(buf, OWRITE)) < 0)
return;
}
write(ctl, "wired 0", 7);
close(ctl);
}
void
main()
{
wirecpu0();
if((fd = open("/dev/apm", ORDWR)) < 0)
if((fd = open("#P/apm", ORDWR)) < 0)
goto tryacpi;
u.ax = 0x530E;
u.bx = 0x0000;
u.cx = 0x0102;
apm();
u.ax = 0x5307;
u.bx = 0x0001;
u.cx = 0x0003;
apm();
tryacpi:
if((fd = open("/dev/acpitbls", OREAD)) < 0)
if((fd = open("#P/acpitbls", OREAD)) < 0)
goto fail;
if((iofd = open("/dev/iow", OWRITE)) < 0)
if((iofd = open("#P/iow", OWRITE)) < 0)
goto fail;
if(loadacpi() < 0)
goto fail;
outw(PM1a_CNT_BLK, ((SLP_TYPa << 10) & SLP_TM) | SLP_EN);
outw(PM1b_CNT_BLK, ((SLP_TYPb << 10) & SLP_TM) | SLP_EN);
sleep(100);
/*
* The SetSystemSleeping() example from the ACPI spec
* writes the same value in both registers. But Linux/BSD
* write distinct values from the _Sx package (like the
* code above). The _S5 package on a HP DC5700 is
* Package(0x2){0x0, 0x7} and writing SLP_TYPa of 0 to
* PM1a_CNT_BLK seems to have no effect but 0x7 seems
* to work fine. So trying the following as a last effort.
*/
SLP_TYPa |= SLP_TYPb;
outw(PM1a_CNT_BLK, ((SLP_TYPa << 10) & SLP_TM) | SLP_EN);
outw(PM1b_CNT_BLK, ((SLP_TYPa << 10) & SLP_TM) | SLP_EN);
sleep(100);
fail:
exits("scram");
}
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