syscall.h

基于ARM核的HMS7202

#ifndef _SYSCALL_H
#define _SYSCALL_H

#define MON_SYSCALL_BASE			0x20
#define MON_SYSCALL_sys_mon	(MON_SYSCALL_BASE + 0x0)
#define MON_SYSCALL_sys_putchar			(MON_SYSCALL_BASE + 0x1)
#define MON_SYSCALL_sys_getchar			(MON_SYSCALL_BASE + 0x2)
#define MON_SYSCALL_sys_setfiq			(MON_SYSCALL_BASE + 0x3)
#define MON_SYSCALL_sys_setirq			(MON_SYSCALL_BASE + 0x4)
#define MON_SYSCALL_sys_get_cp15		(MON_SYSCALL_BASE + 0x5)

#ifdef __GNUCC__

#define __sys2(x) #x
#define __sys1(x) __sys2(x)

#ifndef __syscall
#define __syscall(name) "swi\t" __sys1(MON_SYSCALL_##name) "\n\t"
#endif

#define __syscall_return(type, res)                                     \
do {                                                                    \
        if ((unsigned long)(res) >= (unsigned long)(-125)) {            \
        /*        errno = -(res);   */                                  \
                res = -1;                                               \
        }                                                               \
        return (type) (res);                                            \
} while (0)

#define _syscall0(type,name)                                            \
type name(void) {                                                       \
  long __res;                                                           \
  __asm__ __volatile__ (                                                \
  __syscall(name)                                                       \
  "mov %0,r0"                                                           \
  :"=r" (__res) : : "r0","lr");                                         \
  __syscall_return(type,__res);                                         \
}

#define _syscall1(type,name,type1,arg1)                                 \
type name(type1 arg1) {                                                 \
  long __res;                                                           \
  __asm__ __volatile__ (                                                \
  "mov\tr0,%1\n\t"                                                      \
  __syscall(name)                                                       \
  "mov %0,r0"                                                           \
        : "=r" (__res)                                                  \
        : "r" ((long)(arg1))                                            \
        : "r0","lr");                                                   \
  __syscall_return(type,__res);                                         \
}


static inline _syscall0(int,sys_mon)
static inline _syscall1(int,sys_setfiq,int,flag)
static inline _syscall1(int,sys_setirq,int,flag)
static inline _syscall1(int,sys_putchar,int,ch)
static inline _syscall0(int,sys_getchar)
/*
extern void __syscall(MON_SYSCALL_putchar) sys_putchar(char);
extern char __syscall(MON_SYSCALL_getchar) sys_getchar();
extern void __syscall(MON_SYSCALL_set_fiq) sys_setfiq(int);
extern void __syscall(MON_SYSCALL_set_irq) sys_setirq(int);
extern void __syscall(MON_SYSCALL_get_cp15) sys_get_cp15(int);
*/
#else
/*
extern void __swi(MON_SYSCALL_sys_mon) sys_mon(void);
extern void __swi(MON_SYSCALL_sys_putchar) sys_putchar(char);
extern char __swi(MON_SYSCALL_sys_getchar) sys_getchar(void);
extern void __swi(MON_SYSCALL_sys_setfiq) sys_setfiq(int);
extern void __swi(MON_SYSCALL_sys_setirq) sys_setirq(int);
extern void __swi(MON_SYSCALL_sys_get_cp15) sys_get_cp15(int);
*/
#endif


#define cli() sys_setirq(0)
#define sti() sys_setirq(1)

#endif