utils.c
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#include <common.h>
#include <asm/processor.h>
#include <memio.h>
#include <linux/ctype.h>
static __inline__ unsigned long
get_msr(void)
{
unsigned long msr;
asm volatile("mfmsr %0" : "=r" (msr) :);
return msr;
}
static __inline__ void
set_msr(unsigned long msr)
{
asm volatile("mtmsr %0" : : "r" (msr));
}
static __inline__ unsigned long
get_dec(void)
{
unsigned long val;
asm volatile("mfdec %0" : "=r" (val) :);
return val;
}
static __inline__ void
set_dec(unsigned long val)
{
asm volatile("mtdec %0" : : "r" (val));
}
void
enable_interrupts(void)
{
set_msr (get_msr() | MSR_EE);
}
/* returns flag if MSR_EE was set before */
int
disable_interrupts(void)
{
ulong msr;
msr = get_msr();
set_msr (msr & ~MSR_EE);
return ((msr & MSR_EE) != 0);
}
u8 in8(u32 port)
{
return in_byte(port);
}
void out8(u32 port, u8 val)
{
out_byte(port, val);
}
unsigned long in32(u32 port)
{
return in_long(port);
}
unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
unsigned long result = 0,value;
if (*cp == '0') {
cp++;
if ((*cp == 'x') && isxdigit(cp[1])) {
base = 16;
cp++;
}
if (!base) {
base = 8;
}
}
if (!base) {
base = 10;
}
while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
? toupper(*cp) : *cp)-'A'+10) < base) {
result = result*base + value;
cp++;
}
if (endp)
*endp = (char *)cp;
return result;
}
long simple_strtol(const char *cp,char **endp,unsigned int base)
{
if(*cp=='-')
return -simple_strtoul(cp+1,endp,base);
return simple_strtoul(cp,endp,base);
}
static inline void
soft_restart(unsigned long addr)
{
/* SRR0 has system reset vector, SRR1 has default MSR value */
/* rfi restores MSR from SRR1 and sets the PC to the SRR0 value */
__asm__ __volatile__ ("mtspr 26, %0" :: "r" (addr));
__asm__ __volatile__ ("li 4, (1 << 6)" ::: "r4");
__asm__ __volatile__ ("mtspr 27, 4");
__asm__ __volatile__ ("rfi");
while(1); /* not reached */
}
void
do_reset (void)
{
ulong addr;
/* flush and disable I/D cache */
__asm__ __volatile__ ("mfspr 3, 1008" ::: "r3");
__asm__ __volatile__ ("ori 5, 5, 0xcc00" ::: "r5");
__asm__ __volatile__ ("ori 4, 3, 0xc00" ::: "r4");
__asm__ __volatile__ ("andc 5, 3, 5" ::: "r5");
__asm__ __volatile__ ("sync");
__asm__ __volatile__ ("mtspr 1008, 4");
__asm__ __volatile__ ("isync");
__asm__ __volatile__ ("sync");
__asm__ __volatile__ ("mtspr 1008, 5");
__asm__ __volatile__ ("isync");
__asm__ __volatile__ ("sync");
#ifdef CONFIG_SYS_RESET_ADDRESS
addr = CONFIG_SYS_RESET_ADDRESS;
#else
/*
* note: when CONFIG_SYS_MONITOR_BASE points to a RAM address,
* CONFIG_SYS_MONITOR_BASE - sizeof (ulong) is usually a valid
* address. Better pick an address known to be invalid on your
* system and assign it to CONFIG_SYS_RESET_ADDRESS.
*/
addr = CONFIG_SYS_MONITOR_BASE - sizeof (ulong);
#endif
soft_restart(addr);
while(1); /* not reached */
}