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Merged mcb30-realmode-redesign back to HEAD
This commit is contained in:
Michael Brown
184
src/arch/i386/include/libkir.h
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184
src/arch/i386/include/libkir.h
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#ifndef LIBKIR_H
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#define LIBKIR_H
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#include "realmode.h"
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#ifndef ASSEMBLY
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/*
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* Full API documentation for these functions is in realmode.h.
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*
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*/
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/* Copy to/from base memory */
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static inline void copy_to_real_libkir ( uint16_t dest_seg, uint16_t dest_off,
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void *src, size_t n ) {
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__asm__ ( "movw %4, %%es\n\t"
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"cld\n\t"
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"rep movsb\n\t"
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"pushw %%ds\n\t" /* restore %es */
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"popw %%es\n\t"
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: "=S" ( src ), "=D" ( dest_off ), "=c" ( n ) /* clobbered */
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: "S" ( src ), "r" ( dest_seg ), "D" ( dest_off ), "c" ( n )
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: "memory"
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);
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}
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static inline void copy_from_real_libkir ( void *dest,
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uint16_t src_seg, uint16_t src_off,
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size_t n ) {
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__asm__ ( "movw %%ax, %%ds\n\t"
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"cld\n\t"
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"rep movsb\n\t"
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"pushw %%es\n\t" /* restore %ds */
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"popw %%ds\n\t"
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: "=S" ( src_off ), "=D" ( dest ), "=c" ( n ) /* clobbered */
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: "a" ( src_seg ), "S" ( src_off ), "D" ( dest ), "c" ( n )
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: "memory"
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);
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}
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#define copy_to_real copy_to_real_libkir
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#define copy_from_real copy_from_real_libkir
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/*
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* Transfer individual values to/from base memory. There may well be
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* a neater way to do this. We have two versions: one for constant
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* offsets (where the mov instruction must be of the form "mov
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* %es:123, %xx") and one for non-constant offsets (where the mov
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* instruction must be of the form "mov %es:(%xx), %yx". If it's
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* possible to incorporate both forms into one __asm__ instruction, I
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* don't know how to do it.
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*
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* Ideally, the mov instruction should be "mov%z0"; the "%z0" is meant
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* to expand to either "b", "w" or "l" depending on the size of
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* operand 0. This would remove the (minor) ambiguity in the mov
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* instruction. However, gcc on at least my system barfs with an
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* "internal compiler error" when confronted with %z0.
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*
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*/
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#define put_real_kir_const_off( var, seg, off ) \
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__asm__ ( "movw %w1, %%es\n\t" \
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"mov %0, %%es:%c2\n\t" \
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"pushw %%ds\n\t" /* restore %es */ \
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"popw %%es\n\t" \
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: \
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: "r,r" ( var ), "rm,rm" ( seg ), "i,!r" ( off ) \
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)
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#define put_real_kir_nonconst_off( var, seg, off ) \
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__asm__ ( "movw %w1, %%es\n\t" \
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"mov %0, %%es:(%2)\n\t" \
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"pushw %%ds\n\t" /* restore %es */ \
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"popw %%es\n\t" \
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: \
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: "r" ( var ), "rm" ( seg ), "r" ( off ) \
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)
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#define put_real_kir( var, seg, off ) \
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do { \
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if ( __builtin_constant_p ( off ) ) \
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put_real_kir_const_off ( var, seg, off ); \
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else \
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put_real_kir_nonconst_off ( var, seg, off ); \
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} while ( 0 )
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#define get_real_kir_const_off( var, seg, off ) \
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__asm__ ( "movw %w1, %%es\n\t" \
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"mov %%es:%c2, %0\n\t" \
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"pushw %%ds\n\t" /* restore %es */ \
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"popw %%es\n\t" \
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: "=r,r" ( var ) \
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: "rm,rm" ( seg ), "i,!r" ( off ) \
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)
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#define get_real_kir_nonconst_off( var, seg, off ) \
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__asm__ ( "movw %w1, %%es\n\t" \
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"mov %%es:(%2), %0\n\t" \
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"pushw %%ds\n\t" /* restore %es */ \
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"popw %%es\n\t" \
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: "=r" ( var ) \
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: "rm" ( seg ), "r" ( off ) \
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)
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#define get_real_kir( var, seg, off ) \
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do { \
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if ( __builtin_constant_p ( off ) ) \
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get_real_kir_const_off ( var, seg, off ); \
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else \
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get_real_kir_nonconst_off ( var, seg, off ); \
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} while ( 0 )
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#define put_real put_real_kir
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#define get_real get_real_kir
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/* Place/remove parameter on real-mode stack in a way that's
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* compatible with libkir
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*/
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#define BASEMEM_PARAMETER_INIT_LIBKIR( param ) \
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( ( uint16_t ) ( ( uint32_t ) & ( param ) ) )
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#define BASEMEM_PARAMETER_DONE_LIBKIR( param )
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#define BASEMEM_PARAMETER_INIT BASEMEM_PARAMETER_INIT_LIBKIR
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#define BASEMEM_PARAMETER_DONE BASEMEM_PARAMETER_DONE_LIBKIR
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/* REAL_CALL: call an external real-mode routine */
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#define OUT_CONSTRAINTS(...) __VA_ARGS__
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#define IN_CONSTRAINTS(...) "m" ( __routine ), ## __VA_ARGS__
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#define CLOBBER(...) __VA_ARGS__
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#define REAL_CALL( routine, num_out_constraints, out_constraints, \
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in_constraints, clobber ) \
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do { \
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segoff_t __routine = routine; \
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__asm__ __volatile__ ( \
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"pushl %" #num_out_constraints "\n\t" \
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".code16\n\t" \
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"pushw %%gs\n\t" /* preserve segs */ \
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"pushw %%fs\n\t" \
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"pushw %%es\n\t" \
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"pushw %%ds\n\t" \
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"pushw %%cs\n\t" /* lcall to routine */ \
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"call 1f\n\t" \
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"jmp 2f\n\t" \
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"\n1:\n\t" \
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"addr32 pushl 12(%%esp)\n\t" \
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"lret\n\t" \
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"\n2:\n\t" \
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"popw %%ds\n\t" /* restore segs */ \
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"popw %%es\n\t" \
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"popw %%fs\n\t" \
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"popw %%gs\n\t" \
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"addw $4, %%sp\n\t" \
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".code16gcc\n\t" \
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: out_constraints : in_constraints : clobber \
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); \
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} while ( 0 )
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/* REAL_EXEC: execute some inline assembly code in a way that matches
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* the interface of librm
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*/
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#define IN_CONSTRAINTS_NO_ROUTINE( routine, ... ) __VA_ARGS__
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#define REAL_EXEC( name, asm_code_str, num_out_constraints, out_constraints, \
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in_constraints, clobber ) \
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__asm__ __volatile__ ( \
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".code16\n\t" \
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"pushw %%gs\n\t" \
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"pushw %%fs\n\t" \
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"pushw %%es\n\t" \
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"pushw %%ds\n\t" \
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"\n" #name ":\n\t" \
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asm_code_str \
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"popw %%ds\n\t" \
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"popw %%es\n\t" \
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"popw %%fs\n\t" \
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"popw %%gs\n\t" \
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".code16gcc\n\t" \
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: out_constraints \
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: IN_CONSTRAINTS_NO_ROUTINE ( in_constraints ) \
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: clobber \
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);
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#endif /* ASSEMBLY */
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#endif /* LIBKIR_H */
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