diff options
Diffstat (limited to 'gpxe/src/arch/i386/include/libkir.h')
| -rw-r--r-- | gpxe/src/arch/i386/include/libkir.h | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/gpxe/src/arch/i386/include/libkir.h b/gpxe/src/arch/i386/include/libkir.h deleted file mode 100644 index 1f5b1350..00000000 --- a/gpxe/src/arch/i386/include/libkir.h +++ /dev/null @@ -1,233 +0,0 @@ -#ifndef LIBKIR_H -#define LIBKIR_H - -#include "realmode.h" - -#ifndef ASSEMBLY - -/* - * Full API documentation for these functions is in realmode.h. - * - */ - -/* Access to variables in .data16 and .text16 in a way compatible with librm */ -#define __data16( variable ) variable -#define __data16_array( variable, array ) variable array -#define __bss16( variable ) variable -#define __bss16_array( variable, array ) variable array -#define __text16( variable ) variable -#define __text16_array( variable,array ) variable array -#define __use_data16( variable ) variable -#define __use_text16( variable ) variable -#define __from_data16( pointer ) pointer -#define __from_text16( pointer ) pointer - -/* Real-mode data and code segments */ -static inline __attribute__ (( always_inline )) unsigned int _rm_cs ( void ) { - uint16_t cs; - __asm__ __volatile__ ( "movw %%cs, %w0" : "=r" ( cs ) ); - return cs; -} - -static inline __attribute__ (( always_inline )) unsigned int _rm_ds ( void ) { - uint16_t ds; - __asm__ __volatile__ ( "movw %%ds, %w0" : "=r" ( ds ) ); - return ds; -} - -#define rm_cs ( _rm_cs() ) -#define rm_ds ( _rm_ds() ) - -/* Copy to/from base memory */ - -static inline void copy_to_real_libkir ( unsigned int dest_seg, - unsigned int dest_off, - const void *src, size_t n ) { - unsigned int discard_D, discard_S, discard_c; - - __asm__ __volatile__ ( "pushw %%es\n\t" - "movw %3, %%es\n\t" - "rep movsb\n\t" - "popw %%es\n\t" - : "=D" ( discard_D ), "=S" ( discard_S ), - "=c" ( discard_c ) - : "r" ( dest_seg ), "D" ( dest_off ), - "S" ( src ), - "c" ( n ) - : "memory" ); -} - -static inline void copy_from_real_libkir ( void *dest, - unsigned int src_seg, - unsigned int src_off, - size_t n ) { - unsigned int discard_D, discard_S, discard_c; - - __asm__ __volatile__ ( "pushw %%ds\n\t" - "movw %4, %%ds\n\t" - "rep movsb\n\t" - "popw %%ds\n\t" - : "=D" ( discard_D ), "=S" ( discard_S ), - "=c" ( discard_c ) - : "D" ( dest ), - "r" ( src_seg ), "S" ( src_off ), - "c" ( n ) - : "memory" ); -} - -#define copy_to_real copy_to_real_libkir -#define copy_from_real copy_from_real_libkir - -/* - * Transfer individual values to/from base memory. There may well be - * a neater way to do this. We have two versions: one for constant - * offsets (where the mov instruction must be of the form "mov - * %es:123, %xx") and one for non-constant offsets (where the mov - * instruction must be of the form "mov %es:(%xx), %yx". If it's - * possible to incorporate both forms into one __asm__ instruction, I - * don't know how to do it. - * - * Ideally, the mov instruction should be "mov%z0"; the "%z0" is meant - * to expand to either "b", "w" or "l" depending on the size of - * operand 0. This would remove the (minor) ambiguity in the mov - * instruction. However, gcc on at least my system barfs with an - * "internal compiler error" when confronted with %z0. - * - */ - -#define put_real_kir_const_off( var, seg, off ) \ - __asm__ ( "movw %w1, %%es\n\t" \ - "mov %0, %%es:%c2\n\t" \ - "pushw %%ds\n\t" /* restore %es */ \ - "popw %%es\n\t" \ - : \ - : "r,r" ( var ), "rm,rm" ( seg ), "i,!r" ( off ) \ - ) - -#define put_real_kir_nonconst_off( var, seg, off ) \ - __asm__ ( "movw %w1, %%es\n\t" \ - "mov %0, %%es:(%2)\n\t" \ - "pushw %%ds\n\t" /* restore %es */ \ - "popw %%es\n\t" \ - : \ - : "r" ( var ), "rm" ( seg ), "r" ( off ) \ - ) - -#define put_real_kir( var, seg, off ) \ - do { \ - if ( __builtin_constant_p ( off ) ) \ - put_real_kir_const_off ( var, seg, off ); \ - else \ - put_real_kir_nonconst_off ( var, seg, off ); \ - } while ( 0 ) - -#define get_real_kir_const_off( var, seg, off ) \ - __asm__ ( "movw %w1, %%es\n\t" \ - "mov %%es:%c2, %0\n\t" \ - "pushw %%ds\n\t" /* restore %es */ \ - "popw %%es\n\t" \ - : "=r,r" ( var ) \ - : "rm,rm" ( seg ), "i,!r" ( off ) \ - ) - -#define get_real_kir_nonconst_off( var, seg, off ) \ - __asm__ ( "movw %w1, %%es\n\t" \ - "mov %%es:(%2), %0\n\t" \ - "pushw %%ds\n\t" /* restore %es */ \ - "popw %%es\n\t" \ - : "=r" ( var ) \ - : "rm" ( seg ), "r" ( off ) \ - ) - -#define get_real_kir( var, seg, off ) \ - do { \ - if ( __builtin_constant_p ( off ) ) \ - get_real_kir_const_off ( var, seg, off ); \ - else \ - get_real_kir_nonconst_off ( var, seg, off ); \ - } while ( 0 ) - -#define put_real put_real_kir -#define get_real get_real_kir - -/** - * A pointer to a user buffer - * - * This is actually a struct segoff, but encoded as a uint32_t to - * ensure that gcc passes it around efficiently. - */ -typedef uint32_t userptr_t; - -/** - * Copy data to user buffer - * - * @v buffer User buffer - * @v offset Offset within user buffer - * @v src Source - * @v len Length - */ -static inline __attribute__ (( always_inline )) void -copy_to_user ( userptr_t buffer, off_t offset, const void *src, size_t len ) { - copy_to_real ( ( buffer >> 16 ), ( ( buffer & 0xffff ) + offset ), - src, len ); -} - -/** - * Copy data from user buffer - * - * @v dest Destination - * @v buffer User buffer - * @v offset Offset within user buffer - * @v len Length - */ -static inline __attribute__ (( always_inline )) void -copy_from_user ( void *dest, userptr_t buffer, off_t offset, size_t len ) { - copy_from_real ( dest, ( buffer >> 16 ), - ( ( buffer & 0xffff ) + offset ), len ); -} - -/** - * Convert segment:offset address to user buffer - * - * @v segment Real-mode segment - * @v offset Real-mode offset - * @ret buffer User buffer - */ -static inline __attribute__ (( always_inline )) userptr_t -real_to_user ( unsigned int segment, unsigned int offset ) { - return ( ( segment << 16 ) | offset ); -} - -/** - * Convert virtual address to user buffer - * - * @v virtual Virtual address - * @ret buffer User buffer - * - * This constructs a user buffer from an ordinary pointer. Use it - * when you need to pass a pointer to an internal buffer to a function - * that expects a @c userptr_t. - */ -static inline __attribute__ (( always_inline )) userptr_t -virt_to_user ( void * virtual ) { - return real_to_user ( rm_ds, ( intptr_t ) virtual ); -} - -/* 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" \ - ".arch i386\n\t" \ - asm_code_str "\n\t" \ - ".code16gcc\n\t" \ - ".previous\n\t" - -/* REAL_CODE: declare a fragment of code that executes in real mode */ -#define REAL_CODE( asm_code_str ) \ - ".code16\n\t" \ - asm_code_str "\n\t" \ - ".code16gcc\n\t" - -#endif /* ASSEMBLY */ - -#endif /* LIBKIR_H */ |