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#ifndef LIBRM_H
#define LIBRM_H
FILE_LICENCE ( GPL2_OR_LATER );
/* Segment selectors as used in our protected-mode GDTs.
*
* Don't change these unless you really know what you're doing.
*/
#define VIRTUAL_CS 0x08
#define VIRTUAL_DS 0x10
#define PHYSICAL_CS 0x18
#define PHYSICAL_DS 0x20
#define REAL_CS 0x28
#define REAL_DS 0x30
#if 0
#define LONG_CS 0x38
#define LONG_DS 0x40
#endif
#ifndef ASSEMBLY
#ifdef UACCESS_LIBRM
#define UACCESS_PREFIX_librm
#else
#define UACCESS_PREFIX_librm __librm_
#endif
/* Variables in librm.S */
extern unsigned long virt_offset;
/**
* Convert physical address to user pointer
*
* @v phys_addr Physical address
* @ret userptr User pointer
*/
static inline __always_inline userptr_t
UACCESS_INLINE ( librm, phys_to_user ) ( unsigned long phys_addr ) {
return ( phys_addr - virt_offset );
}
/**
* Convert user buffer to physical address
*
* @v userptr User pointer
* @v offset Offset from user pointer
* @ret phys_addr Physical address
*/
static inline __always_inline unsigned long
UACCESS_INLINE ( librm, user_to_phys ) ( userptr_t userptr, off_t offset ) {
return ( userptr + offset + virt_offset );
}
static inline __always_inline userptr_t
UACCESS_INLINE ( librm, virt_to_user ) ( volatile const void *addr ) {
return trivial_virt_to_user ( addr );
}
static inline __always_inline void *
UACCESS_INLINE ( librm, user_to_virt ) ( userptr_t userptr, off_t offset ) {
return trivial_user_to_virt ( userptr, offset );
}
static inline __always_inline userptr_t
UACCESS_INLINE ( librm, userptr_add ) ( userptr_t userptr, off_t offset ) {
return trivial_userptr_add ( userptr, offset );
}
static inline __always_inline void
UACCESS_INLINE ( librm, memcpy_user ) ( userptr_t dest, off_t dest_off,
userptr_t src, off_t src_off,
size_t len ) {
trivial_memcpy_user ( dest, dest_off, src, src_off, len );
}
static inline __always_inline void
UACCESS_INLINE ( librm, memmove_user ) ( userptr_t dest, off_t dest_off,
userptr_t src, off_t src_off,
size_t len ) {
trivial_memmove_user ( dest, dest_off, src, src_off, len );
}
static inline __always_inline void
UACCESS_INLINE ( librm, memset_user ) ( userptr_t buffer, off_t offset,
int c, size_t len ) {
trivial_memset_user ( buffer, offset, c, len );
}
static inline __always_inline size_t
UACCESS_INLINE ( librm, strlen_user ) ( userptr_t buffer, off_t offset ) {
return trivial_strlen_user ( buffer, offset );
}
static inline __always_inline off_t
UACCESS_INLINE ( librm, memchr_user ) ( userptr_t buffer, off_t offset,
int c, size_t len ) {
return trivial_memchr_user ( buffer, offset, c, len );
}
/******************************************************************************
*
* Access to variables in .data16 and .text16
*
*/
extern char *data16;
extern char *text16;
#define __data16( variable ) \
__attribute__ (( section ( ".data16" ) )) \
_data16_ ## variable __asm__ ( #variable )
#define __data16_array( variable, array ) \
__attribute__ (( section ( ".data16" ) )) \
_data16_ ## variable array __asm__ ( #variable )
#define __bss16( variable ) \
__attribute__ (( section ( ".bss16" ) )) \
_data16_ ## variable __asm__ ( #variable )
#define __bss16_array( variable, array ) \
__attribute__ (( section ( ".bss16" ) )) \
_data16_ ## variable array __asm__ ( #variable )
#define __text16( variable ) \
__attribute__ (( section ( ".text16.data" ) )) \
_text16_ ## variable __asm__ ( #variable )
#define __text16_array( variable, array ) \
__attribute__ (( section ( ".text16.data" ) )) \
_text16_ ## variable array __asm__ ( #variable )
#define __use_data16( variable ) \
( * ( ( typeof ( _data16_ ## variable ) * ) \
& ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) )
#define __use_text16( variable ) \
( * ( ( typeof ( _text16_ ## variable ) * ) \
& ( text16 [ ( size_t ) & ( _text16_ ## variable ) ] ) ) )
#define __from_data16( pointer ) \
( ( unsigned int ) \
( ( ( void * ) (pointer) ) - ( ( void * ) data16 ) ) )
#define __from_text16( pointer ) \
( ( unsigned int ) \
( ( ( void * ) (pointer) ) - ( ( void * ) text16 ) ) )
/* Variables in librm.S, present in the normal data segment */
extern uint16_t rm_sp;
extern uint16_t rm_ss;
extern uint16_t __data16 ( rm_cs );
#define rm_cs __use_data16 ( rm_cs )
extern uint16_t __text16 ( rm_ds );
#define rm_ds __use_text16 ( rm_ds )
/* Functions that librm expects to be able to link to. Included here
* so that the compiler will catch prototype mismatches.
*/
extern void gateA20_set ( void );
/**
* Convert segment:offset address to user buffer
*
* @v segment Real-mode segment
* @v offset Real-mode offset
* @ret buffer User buffer
*/
static inline __always_inline userptr_t
real_to_user ( unsigned int segment, unsigned int offset ) {
return ( phys_to_user ( ( segment << 4 ) + offset ) );
}
extern uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size );
extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
/* TEXT16_CODE: declare a fragment of code that resides in .text16 */
#define TEXT16_CODE( asm_code_str ) \
".section \".text16\", \"ax\", @progbits\n\t" \
".code16\n\t" \
asm_code_str "\n\t" \
".code32\n\t" \
".previous\n\t"
/* REAL_CODE: declare a fragment of code that executes in real mode */
#define REAL_CODE( asm_code_str ) \
"pushl $1f\n\t" \
"call real_call\n\t" \
"addl $4, %%esp\n\t" \
TEXT16_CODE ( "\n1:\n\t" \
asm_code_str \
"\n\t" \
"ret\n\t" )
/* PHYS_CODE: declare a fragment of code that executes in flat physical mode */
#define PHYS_CODE( asm_code_str ) \
"call _virt_to_phys\n\t" \
asm_code_str \
"call _phys_to_virt\n\t"
#endif /* ASSEMBLY */
#endif /* LIBRM_H */
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