276 lines
7.2 KiB
C
276 lines
7.2 KiB
C
#ifndef LIBRM_H
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#define LIBRM_H
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/* Segment selectors as used in our protected-mode GDTs.
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*
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* Don't change these unless you really know what you're doing.
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*/
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#define VIRTUAL_CS 0x08
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#define VIRTUAL_DS 0x10
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#define PHYSICAL_CS 0x18
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#define PHYSICAL_DS 0x20
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#define REAL_CS 0x28
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#define REAL_DS 0x30
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#if 0
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#define LONG_CS 0x38
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#define LONG_DS 0x40
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#endif
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#ifndef ASSEMBLY
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#ifdef UACCESS_LIBRM
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#define UACCESS_PREFIX_librm
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#else
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#define UACCESS_PREFIX_librm __librm_
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#endif
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/* Variables in librm.S */
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extern unsigned long virt_offset;
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/**
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* Convert physical address to user pointer
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*
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* @v phys_addr Physical address
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* @ret userptr User pointer
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*/
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static inline __always_inline userptr_t
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UACCESS_INLINE ( librm, phys_to_user ) ( unsigned long phys_addr ) {
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return ( phys_addr - virt_offset );
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}
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/**
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* Convert user buffer to physical address
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*
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* @v userptr User pointer
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* @v offset Offset from user pointer
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* @ret phys_addr Physical address
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*/
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static inline __always_inline unsigned long
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UACCESS_INLINE ( librm, user_to_phys ) ( userptr_t userptr, off_t offset ) {
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return ( userptr + offset + virt_offset );
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}
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static inline __always_inline userptr_t
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UACCESS_INLINE ( librm, virt_to_user ) ( volatile const void *addr ) {
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return trivial_virt_to_user ( addr );
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}
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static inline __always_inline void *
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UACCESS_INLINE ( librm, user_to_virt ) ( userptr_t userptr, off_t offset ) {
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return trivial_user_to_virt ( userptr, offset );
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}
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static inline __always_inline userptr_t
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UACCESS_INLINE ( librm, userptr_add ) ( userptr_t userptr, off_t offset ) {
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return trivial_userptr_add ( userptr, offset );
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}
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static inline __always_inline off_t
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UACCESS_INLINE ( librm, userptr_sub ) ( userptr_t userptr,
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userptr_t subtrahend ) {
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return trivial_userptr_sub ( userptr, subtrahend );
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}
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static inline __always_inline void
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UACCESS_INLINE ( librm, memcpy_user ) ( userptr_t dest, off_t dest_off,
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userptr_t src, off_t src_off,
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size_t len ) {
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trivial_memcpy_user ( dest, dest_off, src, src_off, len );
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}
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static inline __always_inline void
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UACCESS_INLINE ( librm, memmove_user ) ( userptr_t dest, off_t dest_off,
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userptr_t src, off_t src_off,
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size_t len ) {
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trivial_memmove_user ( dest, dest_off, src, src_off, len );
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}
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static inline __always_inline int
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UACCESS_INLINE ( librm, memcmp_user ) ( userptr_t first, off_t first_off,
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userptr_t second, off_t second_off,
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size_t len ) {
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return trivial_memcmp_user ( first, first_off, second, second_off, len);
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}
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static inline __always_inline void
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UACCESS_INLINE ( librm, memset_user ) ( userptr_t buffer, off_t offset,
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int c, size_t len ) {
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trivial_memset_user ( buffer, offset, c, len );
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}
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static inline __always_inline size_t
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UACCESS_INLINE ( librm, strlen_user ) ( userptr_t buffer, off_t offset ) {
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return trivial_strlen_user ( buffer, offset );
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}
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static inline __always_inline off_t
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UACCESS_INLINE ( librm, memchr_user ) ( userptr_t buffer, off_t offset,
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int c, size_t len ) {
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return trivial_memchr_user ( buffer, offset, c, len );
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}
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/******************************************************************************
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*
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* Access to variables in .data16 and .text16
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*
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*/
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extern char *data16;
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extern char *text16;
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#define __data16( variable ) \
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__attribute__ (( section ( ".data16" ) )) \
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_data16_ ## variable __asm__ ( #variable )
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#define __data16_array( variable, array ) \
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__attribute__ (( section ( ".data16" ) )) \
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_data16_ ## variable array __asm__ ( #variable )
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#define __bss16( variable ) \
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__attribute__ (( section ( ".bss16" ) )) \
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_data16_ ## variable __asm__ ( #variable )
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#define __bss16_array( variable, array ) \
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__attribute__ (( section ( ".bss16" ) )) \
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_data16_ ## variable array __asm__ ( #variable )
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#define __text16( variable ) \
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__attribute__ (( section ( ".text16.data" ) )) \
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_text16_ ## variable __asm__ ( #variable )
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#define __text16_array( variable, array ) \
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__attribute__ (( section ( ".text16.data" ) )) \
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_text16_ ## variable array __asm__ ( #variable )
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#define __use_data16( variable ) \
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( * ( ( typeof ( _data16_ ## variable ) * ) \
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& ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) )
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#define __use_text16( variable ) \
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( * ( ( typeof ( _text16_ ## variable ) * ) \
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& ( text16 [ ( size_t ) & ( _text16_ ## variable ) ] ) ) )
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#define __from_data16( pointer ) \
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( ( unsigned int ) \
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( ( ( void * ) (pointer) ) - ( ( void * ) data16 ) ) )
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#define __from_text16( pointer ) \
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( ( unsigned int ) \
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( ( ( void * ) (pointer) ) - ( ( void * ) text16 ) ) )
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/* Variables in librm.S, present in the normal data segment */
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extern uint16_t rm_sp;
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extern uint16_t rm_ss;
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extern uint16_t __text16 ( rm_cs );
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#define rm_cs __use_text16 ( rm_cs )
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extern uint16_t __text16 ( rm_ds );
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#define rm_ds __use_text16 ( rm_ds )
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extern uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size );
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extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
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/* CODE_DEFAULT: restore default .code32/.code64 directive */
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#ifdef __x86_64__
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#define CODE_DEFAULT ".code64"
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#else
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#define CODE_DEFAULT ".code32"
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#endif
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/* TEXT16_CODE: declare a fragment of code that resides in .text16 */
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#define TEXT16_CODE( asm_code_str ) \
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".section \".text16\", \"ax\", @progbits\n\t" \
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".code16\n\t" \
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asm_code_str "\n\t" \
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CODE_DEFAULT "\n\t" \
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".previous\n\t"
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/* REAL_CODE: declare a fragment of code that executes in real mode */
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#define REAL_CODE( asm_code_str ) \
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"push $1f\n\t" \
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"call real_call\n\t" \
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TEXT16_CODE ( "\n1:\n\t" \
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asm_code_str \
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"\n\t" \
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"ret\n\t" )
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/* PHYS_CODE: declare a fragment of code that executes in flat physical mode */
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#define PHYS_CODE( asm_code_str ) \
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"call _virt_to_phys\n\t" \
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".code32\n\t" \
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asm_code_str \
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"call _phys_to_virt\n\t" \
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CODE_DEFAULT "\n\t"
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/** Number of interrupts */
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#define NUM_INT 256
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/** An interrupt descriptor table register */
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struct idtr {
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/** Limit */
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uint16_t limit;
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/** Base */
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uint32_t base;
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} __attribute__ (( packed ));
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/** An interrupt descriptor table entry */
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struct interrupt_descriptor {
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/** Low 16 bits of address */
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uint16_t low;
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/** Code segment */
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uint16_t segment;
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/** Unused */
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uint8_t unused;
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/** Type and attributes */
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uint8_t attr;
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/** High 16 bits of address */
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uint16_t high;
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} __attribute__ (( packed ));
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/** Interrupt descriptor is present */
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#define IDTE_PRESENT 0x80
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/** Interrupt descriptor 32-bit interrupt gate type */
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#define IDTE_TYPE_IRQ32 0x0e
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/** An interrupt vector
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*
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* Each interrupt vector comprises an eight-byte fragment of code:
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*
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* 60 pushal
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* b0 xx movb $INT, %al
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* e9 xx xx xx xx jmp interrupt_wrapper
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*/
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struct interrupt_vector {
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/** "pushal" instruction */
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uint8_t pushal;
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/** "movb" instruction */
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uint8_t movb;
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/** Interrupt number */
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uint8_t intr;
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/** "jmp" instruction */
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uint8_t jmp;
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/** Interrupt wrapper address offset */
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uint32_t offset;
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/** Next instruction after jump */
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uint8_t next[0];
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} __attribute__ (( packed ));
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/** "pushal" instruction */
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#define PUSHAL_INSN 0x60
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/** "movb" instruction */
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#define MOVB_INSN 0xb0
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/** "jmp" instruction */
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#define JMP_INSN 0xe9
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extern void set_interrupt_vector ( unsigned int intr, void *vector );
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#endif /* ASSEMBLY */
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#endif /* LIBRM_H */
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