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#ifndef CPU_H
#define CPU_H
extern void _start(void);
static inline unsigned long getmode(void)
{
unsigned long mode;
asm volatile ("mrs %0, cpsr" : "=r"(mode));
return mode;
}
static inline void setsvc(void)
{
asm volatile ( "cps #0x13" );
}
static inline void setmode(unsigned long mode)
{
asm volatile ("msr cpsr_c, %0" :: "r"(mode));
}
static inline void* getsysstack(void)
{
void* sp;
asm volatile (
"mrs r0, cpsr\n"
"bic r1, r0, #0x1F\n"
"orr r1, r1, #0x1F\n"
"msr cpsr_c, r1\n"
"mov %0, sp\n"
"msr cpsr_c, r0"
: "=r"(sp));
return sp;
}
static inline void* getsvcstack(void)
{
void* sp;
asm volatile (
"mrs r0, cpsr\n"
"bic r1, r0, #0x1F\n"
"orr r1, r1, #0x13\n"
"msr cpsr_c, r1\n"
"mov %0, sp\n"
"msr cpsr_c, r0"
: "=r"(sp));
return sp;
}
static inline void* getfiqstack(void)
{
void* sp;
asm volatile (
"mrs r0, cpsr\n"
"bic r1, r0, #0x1F\n"
"orr r1, r1, #0x11\n"
"msr cpsr_c, r1\n"
"mov %0, sp\n"
"msr cpsr_c, r0"
: "=r"(sp));
return sp;
}
static inline void* getirqstack(void)
{
void* sp;
asm volatile (
"mrs r0, cpsr\n"
"bic r1, r0, #0x1F\n"
"orr r1, r1, #0x12\n"
"msr cpsr_c, r1\n"
"mov %0, sp\n"
"msr cpsr_c, r0"
: "=r"(sp));
return sp;
}
#endif
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