ref: 46bac13b16df5cbd92ea1da12cfef168201f0dad
dir: /sys/src/9/imx8/main.c/
#include "u.h"
#include "tos.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "pool.h"
#include "io.h"
#include "sysreg.h"
#include "ureg.h"
#include "rebootcode.i"
Conf conf;
#define MAXCONF 64
static char *confname[MAXCONF];
static char *confval[MAXCONF];
static int nconf = -1;
void
bootargsinit(void)
{
int i, j, n;
char *cp, *line[MAXCONF], *p, *q;
/*
* parse configuration args from dos file plan9.ini
*/
cp = BOOTARGS;
cp[BOOTARGSLEN-1] = 0;
/*
* Strip out '\r', change '\t' -> ' '.
*/
p = cp;
for(q = cp; *q; q++){
if(*q == -1)
break;
if(*q == '\r')
continue;
if(*q == '\t')
*q = ' ';
*p++ = *q;
}
*p = 0;
n = getfields(cp, line, MAXCONF, 1, "\n");
if(n <= 0){
/* empty plan9.ini, no configuration passed */
return;
}
nconf = 0;
for(i = 0; i < n; i++){
if(*line[i] == '#')
continue;
cp = strchr(line[i], '=');
if(cp == nil)
continue;
*cp++ = '\0';
for(j = 0; j < nconf; j++){
if(cistrcmp(confname[j], line[i]) == 0)
break;
}
confname[j] = line[i];
confval[j] = cp;
if(j == nconf)
nconf++;
}
}
char*
getconf(char *name)
{
int i;
for(i = 0; i < nconf; i++)
if(cistrcmp(confname[i], name) == 0)
return confval[i];
return nil;
}
void
setconfenv(void)
{
int i;
if(nconf < 0){
/* use defaults when there was no configuration */
ksetenv("console", "0", 1);
return;
}
for(i = 0; i < nconf; i++){
if(confname[i][0] != '*')
ksetenv(confname[i], confval[i], 0);
ksetenv(confname[i], confval[i], 1);
}
}
void
writeconf(void)
{
char *p, *q;
int n;
p = getconfenv();
if(waserror()) {
free(p);
nexterror();
}
/* convert to name=value\n format */
for(q=p; *q; q++) {
q += strlen(q);
*q = '=';
q += strlen(q);
*q = '\n';
}
n = q - p + 1;
if(n >= BOOTARGSLEN)
error("kernel configuration too large");
memmove(BOOTARGS, p, n);
memset(BOOTARGS+n, 0, BOOTARGSLEN-n);
poperror();
free(p);
}
int
isaconfig(char *, int, ISAConf *)
{
return 0;
}
/*
* starting place for first process
*/
void
init0(void)
{
char **sp;
chandevinit();
if(!waserror()){
ksetenv("cputype", "arm64", 0);
if(cpuserver)
ksetenv("service", "cpu", 0);
else
ksetenv("service", "terminal", 0);
setconfenv();
poperror();
}
kproc("alarm", alarmkproc, 0);
sp = (char**)(USTKTOP-sizeof(Tos) - 8 - sizeof(sp[0])*4);
sp[3] = sp[2] = sp[1] = nil;
strcpy(sp[1] = (char*)&sp[4], "boot");
sp[0] = (void*)&sp[1];
touser((uintptr)sp);
}
void
confinit(void)
{
int userpcnt;
ulong kpages;
char *p;
int i;
conf.nmach = MAXMACH;
if(p = getconf("service")){
if(strcmp(p, "cpu") == 0)
cpuserver = 1;
else if(strcmp(p,"terminal") == 0)
cpuserver = 0;
}
if(p = getconf("*kernelpercent"))
userpcnt = 100 - strtol(p, 0, 0);
else
userpcnt = 0;
if(userpcnt < 10)
userpcnt = 60 + cpuserver*10;
conf.npage = 0;
for(i = 0; i < nelem(conf.mem); i++)
conf.npage += conf.mem[i].npage;
kpages = conf.npage - (conf.npage*userpcnt)/100;
if(kpages > ((uintptr)-VDRAM)/BY2PG)
kpages = ((uintptr)-VDRAM)/BY2PG;
conf.upages = conf.npage - kpages;
conf.ialloc = (kpages/2)*BY2PG;
/* set up other configuration parameters */
conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
if(cpuserver)
conf.nproc *= 3;
if(conf.nproc > 4000)
conf.nproc = 4000;
conf.nswap = conf.npage*3;
conf.nswppo = 4096;
conf.nimage = 200;
conf.copymode = conf.nmach > 1;
/*
* Guess how much is taken by the large permanent
* datastructures. Mntcache and Mntrpc are not accounted for.
*/
kpages = conf.npage - conf.upages;
kpages *= BY2PG;
kpages -= conf.upages*sizeof(Page)
+ conf.nproc*sizeof(Proc*)
+ conf.nimage*sizeof(Image)
+ conf.nswap
+ conf.nswppo*sizeof(Page*);
mainmem->maxsize = kpages;
imagmem->maxsize = kpages;
}
void
machinit(void)
{
m->ticks = 1;
m->perf.period = 1;
active.machs[m->machno] = 1;
}
void
mpinit(void)
{
extern void _start(void);
int i;
splhi();
for(i = 1; i < conf.nmach; i++){
Ureg u = {0};
MACHP(i)->machno = i;
cachedwbinvse(MACHP(i), MACHSIZE);
u.r0 = 0x84000003; /* CPU_ON */
u.r1 = (sysrd(MPIDR_EL1) & ~0xFF) | i;
u.r2 = PADDR(_start);
u.r3 = i;
smccall(&u);
}
synccycles();
spllo();
}
void
cpuidprint(void)
{
iprint("cpu%d: %dMHz ARM Cortex A53\n", m->machno, m->cpumhz);
}
static void
tmuinit(void)
{
Physseg seg;
setclkgate("tmu.clk", 1);
memset(&seg, 0, sizeof(seg));
seg.attr = SG_PHYSICAL | SG_DEVICE | SG_NOEXEC;
seg.name = "tmu";
seg.pa = VIRTIO + 0x260000 - KZERO;
seg.size = BY2PG;
addphysseg(&seg);
}
static void
lpcspiinit(void)
{
Physseg seg;
iomuxpad("pad_ecspi2_sclk", "ecspi2_sclk", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");
iomuxpad("pad_ecspi2_mosi", "ecspi2_mosi", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");
iomuxpad("pad_ecspi2_miso", "ecspi2_miso", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");
iomuxpad("pad_ecspi2_ss0", "ecspi2_ss0", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");
setclkgate("ecspi2.ipg_clk", 0);
setclkgate("ecspi2.ipg_clk_per", 0);
setclkrate("ecspi2.ipg_clk_per", "osc_25m_ref_clk", 25*Mhz);
setclkgate("ecspi2.ipg_clk_per", 1);
setclkgate("ecspi2.ipg_clk", 1);
memset(&seg, 0, sizeof(seg));
seg.attr = SG_PHYSICAL | SG_DEVICE | SG_NOEXEC;
seg.name = "ecspi2";
seg.pa = VIRTIO + 0x830000 - KZERO;
seg.size = BY2PG;
addphysseg(&seg);
}
void
main(void)
{
machinit();
if(m->machno){
trapinit();
fpuinit();
intrinit();
clockinit();
cpuidprint();
synccycles();
timersinit();
flushtlb();
mmu1init();
m->ticks = MACHP(0)->ticks;
schedinit();
return;
}
quotefmtinstall();
bootargsinit();
meminit();
confinit();
xinit();
uartconsinit();
printinit();
print("\nPlan 9\n");
trapinit();
fpuinit();
intrinit();
clockinit();
cpuidprint();
timersinit();
pageinit();
procinit0();
initseg();
links();
chandevreset();
gpioinit();
lcdinit();
tmuinit();
lpcspiinit();
userinit();
mpinit();
mmu0clear((uintptr*)L1);
flushtlb();
mmu1init();
schedinit();
}
void
exit(int)
{
Ureg u = { .r0 = 0x84000002 }; /* CPU_OFF */
cpushutdown();
splfhi();
if(m->machno == 0){
/* clear secrets */
zeroprivatepages();
poolreset(secrmem);
u.r0 = 0x84000009; /* SYSTEM RESET */
}
smccall(&u);
}
static void
rebootjump(void *entry, void *code, ulong size)
{
void (*f)(void*, void*, ulong);
intrcpushutdown();
/* redo identity map */
mmuidmap((uintptr*)L1);
/* setup reboot trampoline function */
f = (void*)REBOOTADDR;
memmove(f, rebootcode, sizeof(rebootcode));
cachedwbinvse(f, sizeof(rebootcode));
cacheiinvse(f, sizeof(rebootcode));
(*f)(entry, code, size);
for(;;);
}
void
reboot(void*, void *code, ulong size)
{
writeconf();
while(m->machno != 0){
procwired(up, 0);
sched();
}
cpushutdown();
delay(2000);
splfhi();
/* turn off buffered serial console */
serialoq = nil;
/* shutdown devices */
chandevshutdown();
/* stop the clock */
clockshutdown();
intrsoff();
/* clear secrets */
zeroprivatepages();
poolreset(secrmem);
/* off we go - never to return */
rebootjump((void*)(KTZERO-KZERO), code, size);
}
void
dmaflush(int clean, void *p, ulong len)
{
uintptr s = (uintptr)p;
uintptr e = (uintptr)p + len;
if(clean){
s &= ~(BLOCKALIGN-1);
e += BLOCKALIGN-1;
e &= ~(BLOCKALIGN-1);
cachedwbse((void*)s, e - s);
return;
}
if(s & BLOCKALIGN-1){
s &= ~(BLOCKALIGN-1);
cachedwbinvse((void*)s, BLOCKALIGN);
s += BLOCKALIGN;
}
if(e & BLOCKALIGN-1){
e &= ~(BLOCKALIGN-1);
if(e < s)
return;
cachedwbinvse((void*)e, BLOCKALIGN);
}
if(s < e)
cachedinvse((void*)s, e - s);
}