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#include "armv7m.h"
void putc(char c)
{
if(c=='\n')
putc('\r');
loop_until(32, UART_FLAG, 0x20, ==, 0); /* wait for TX FIFO not full */
out8(UART_DATA, c);
}
void puts(const char *s)
{
char c;
while((c=*s++)!='\0')
putc(c);
}
void flush(void)
{
/* wait for TX FIFO empty */
loop_until(32, UART_FLAG, 0x80, ==, 0x80);
}
void puthex(uint32_t v)
{
unsigned i;
for(i=0; i<8; i++, v<<=4) {
putc(hexchars[v>>28]);
}
}
void putdec(uint32_t v)
{
unsigned out=0;
uint32_t base=1000000000;
for(;base; base/=10) {
uint32_t d=v/base;
if(!d && !out) continue;
putc('0'+d);
v%=base;
out=1;
}
if(!out) putc('0');
}
void printk(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vprintk(fmt, args);
va_end(args);
}
void vprintk(const char *fmt, va_list args)
{
while(1) {
char c=*fmt++;
if(c=='\0') {
return;
} else if(c!='%') {
putc(c);
} else {
specmod:
c = *fmt++;
switch(c) {
case '\0': return;
case '%': putc(c); break;
case '0'...'9':
case ' ':
/* ignore modifiers */
goto specmod;
case 'u': {
unsigned v = va_arg(args, unsigned);
putdec(v);
break;
}
case 'c': {
char v = va_arg(args, int);
putc(v);
break;
}
case 'x': {
unsigned v = va_arg(args, unsigned);
puthex(v);
break;
}
case 'p': {
const void *v = va_arg(args, const void*);
puthex((uint32_t)v);
break;
}
case 's': {
const char *v = va_arg(args, const char*);
if(v)
puts(v);
else
puts("<null>");
break;
}
default:
putc('!');
break;
}
}
}
}
unsigned log2_ceil(uint32_t v)
{
unsigned r=0, c=0;
while(v) {
c += v&1;
v >>= 1;
r++;
}
if(c>1) r++;
return r;
}
void set_mpu(unsigned region, uint32_t base, uint32_t size,
uint32_t attrs)
{
unsigned sbits = log2_ceil(size<32 ? 32 : size)-2;
uint32_t rbase = base&(~0x1f);
uint32_t rattr = (attrs&~0xffff) | (sbits<<1) | 1;
puts("# set_mpu ");
putc('0'+region);
putc(' ');
puthex(rbase);
putc(' ');
puthex(rattr);
putc('\n');
out32((void*)0xe000ed98, region&0xff); /* RNR */
out32((void*)0xe000eda0, 0); /* Disable */
out32((void*)0xe000ed9c, rbase);
out32((void*)0xe000eda0, rattr);
}
void enable_mpu(unsigned usrena, unsigned privena, unsigned hfnmiena)
{
uint32_t val = (usrena ? 1 : 0) | (hfnmiena ? 2 : 0) | (privena ? 0 : 4);
out32((void*)0xe000ed94, val);
__asm__ volatile ("dsb\nisb" :::);
}
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