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// Basic x86 asm functions and function defs.
// Copyright (C) 2008 Kevin O'Connor <>
// This file may be distributed under the terms of the GNU LGPLv3 license.
#ifndef __UTIL_H
#define __UTIL_H
#include "types.h" // u32
static inline void irq_disable(void)
asm volatile("cli": : :"memory");
static inline void irq_enable(void)
asm volatile("sti": : :"memory");
static inline unsigned long irq_save(void)
unsigned long flags;
asm volatile("pushfl ; popl %0" : "=g" (flags));
return flags;
static inline void irq_restore(unsigned long flags)
asm volatile("pushl %0 ; popfl" : : "g" (flags) : "memory", "cc");
static inline void cpu_relax(void)
asm volatile("rep ; nop": : :"memory");
static inline void nop(void)
asm volatile("nop");
static inline void hlt(void)
asm volatile("hlt");
static inline void wbinvd(void)
asm volatile("wbinvd");
static inline void cpuid(u32 index, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
: "0" (index));
static inline u64 rdtscll(void)
u64 val;
asm volatile("rdtsc" : "=A" (val));
return val;
// util.c
inline u32 stack_hop(u32 eax, u32 edx, u32 ecx, void *func);
u8 checksum_far(u16 buf_seg, void *buf_far, u32 len);
u8 checksum(void *buf, u32 len);
int streq(char *s1, char *s2);
void *memset(void *s, int c, size_t n);
void *memcpy(void *d1, const void *s1, size_t len);
inline void memcpy_far(u16 d_seg, void *d_far
, u16 s_seg, const void *s_far, size_t len);
void *memmove(void *d, const void *s, size_t len);
char *strtcpy(char *dest, const char *src, size_t len);
struct bregs;
inline void call16(struct bregs *callregs);
inline void call16big(struct bregs *callregs);
inline void __call16_int(struct bregs *callregs, u16 offset);
#define call16_int(nr, callregs) do { \
extern void irq_trampoline_ ##nr (); \
__call16_int((callregs), (u32)&irq_trampoline_ ##nr ); \
} while (0)
inline void call16_simpint(int nr, u32 *eax, u32 *flags);
void usleep(u32 usec);
int get_keystroke(int msec);
// output.c
void debug_serial_setup();
void panic(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)))
__attribute__ ((noreturn));
void printf(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
void __dprintf(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
#define dprintf(lvl, fmt, args...) do { \
__dprintf((fmt) , ##args ); \
} while (0)
void __debug_enter(struct bregs *regs, const char *fname);
void __debug_stub(struct bregs *regs, int lineno, const char *fname);
void __debug_isr(const char *fname);
#define debug_enter(regs, lvl) do { \
if ((lvl) && (lvl) <= CONFIG_DEBUG_LEVEL) \
__debug_enter((regs), __func__); \
} while (0)
#define debug_isr(lvl) do { \
if ((lvl) && (lvl) <= CONFIG_DEBUG_LEVEL) \
__debug_isr(__func__); \
} while (0)
#define debug_stub(regs) \
__debug_stub((regs), __LINE__, __func__)
void hexdump(void *d, int len);
// kbd.c
void kbd_setup();
void handle_15c2(struct bregs *regs);
// mouse.c
void mouse_setup();
// system.c
extern u32 RamSize;
extern u64 RamSizeOver4G;
void mathcp_setup();
// serial.c
void serial_setup();
void lpt_setup();
// clock.c
void timer_setup();
void ndelay(u32 count);
void udelay(u32 count);
void mdelay(u32 count);
u64 calc_future_tsc(u32 msecs);
void handle_1583(struct bregs *regs);
void handle_1586(struct bregs *regs);
// apm.c
void VISIBLE16 handle_1553(struct bregs *regs);
// pcibios.c
void handle_1ab1(struct bregs *regs);
// shadow.c
void make_bios_writable();
void make_bios_readonly();
// pciinit.c
void pci_bios_setup(void);
// smm.c
void smm_init();
// smpdetect.c
int smp_probe(void);
void smp_probe_setup(void);
// smbios.c
void smbios_init(void);
// coreboot.c
void *cb_find_optionrom(u32 vendev);
void coreboot_setup();
// vgahooks.c
void handle_155f();
// optionroms.c
void call_bcv(u16 seg, u16 ip);
void vga_setup();
void optionrom_setup();
// resume.c
void init_dma();
// pnpbios.c
#define PNP_SIGNATURE 0x506e5024 // $PnP
u16 get_pnp_offset();
void pnp_setup();
// mtrr.c
void mtrr_setup(void);
// romlayout.S
void reset_vector() __attribute__ ((noreturn));
// misc.c
extern u8 BiosChecksum;
#endif // util.h