foboot/sw/include/system.h
Sean Cross a3c05bd19e sw: system: add reset key to reboot()
Add the key `0xac` to the reset command, to prevent accidental resets.

Signed-off-by: Sean Cross <sean@xobs.io>
2019-04-02 16:40:09 +08:00

71 lines
1.6 KiB
C

#ifndef __SYSTEM_H
#define __SYSTEM_H
#ifdef __cplusplus
extern "C" {
#endif
void flush_cpu_icache(void);
void flush_cpu_dcache(void);
void flush_l2_cache(void);
#ifdef __or1k__
#include <spr-defs.h>
static inline unsigned long mfspr(unsigned long add)
{
unsigned long ret;
__asm__ __volatile__ ("l.mfspr %0,%1,0" : "=r" (ret) : "r" (add));
return ret;
}
static inline void mtspr(unsigned long add, unsigned long val)
{
__asm__ __volatile__ ("l.mtspr %0,%1,0" : : "r" (add), "r" (val));
}
#endif
#if defined(__vexriscv__) || defined(__minerva__)
#include <csr-defs.h>
#define csrr(reg) ({ unsigned long __tmp; \
asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \
__tmp; })
#define csrw(reg, val) ({ \
if (__builtin_constant_p(val) && (unsigned long)(val) < 32) \
asm volatile ("csrw " #reg ", %0" :: "i"(val)); \
else \
asm volatile ("csrw " #reg ", %0" :: "r"(val)); })
#define csrs(reg, bit) ({ \
if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
asm volatile ("csrrs x0, " #reg ", %0" :: "i"(bit)); \
else \
asm volatile ("csrrs x0, " #reg ", %0" :: "r"(bit)); })
#define csrc(reg, bit) ({ \
if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
asm volatile ("csrrc x0, " #reg ", %0" :: "i"(bit)); \
else \
asm volatile ("csrrc x0, " #reg ", %0" :: "r"(bit)); })
#endif
#ifdef __cplusplus
}
#endif
#include <generated/csr.h>
__attribute__((noreturn)) static inline void reboot(void) {
reboot_ctrl_write(0xac);
while (1);
}
__attribute__((noreturn)) static inline void reboot_to_image(uint8_t image_index) {
reboot_ctrl_write(0xac | (image_index & 3) << 0);
while (1);
}
#endif /* __SYSTEM_H */