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Towards a(nother) new real-mode infrastructure, in which we take

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advantage of the fact that we have to have a permanently-resident block
in base memory.
This commit is contained in:
Michael Brown
2006-05-02 15:41:21 +00:00
parent 8f62b39c03
commit 9fcded3d23
10 changed files with 464 additions and 1186 deletions
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101
src/arch/i386/include/librm.h
View File

@@ -15,63 +15,15 @@
*
*/
/* Real-mode call parameter block, as passed to real_call */
struct real_call_params {
struct i386_seg_regs segs;
struct i386_regs regs;
segoff_t rm_code;
segoff_t reserved;
} PACKED;
/* Current location of librm in base memory */
extern char *installed_librm;
/* Start and size of our source copy of librm (i.e. the one that we
* can install by copying it to base memory and setting
* installed_librm)
*/
extern char librm[];
extern size_t _librm_size[];
/* Linker symbols for offsets within librm. Other symbols should
* almost certainly not be referred to from C code.
*/
extern void (*_real_to_prot[]) ( void );
extern void (*_prot_to_real[]) ( void );
extern void (*_prot_call[]) ( void );
extern void (*_real_call[]) ( void );
extern uint32_t _librm_base[];
extern segoff_t _rm_stack[];
extern uint32_t _pm_stack[];
extern char _librm_ref_count[];
/* Symbols within current installation of librm */
#define LIBRM_VAR( sym ) \
( * ( ( typeof ( * _ ## sym ) * ) \
& ( installed_librm [ (int) _ ## sym ] ) ) )
#define LIBRM_FN( sym ) \
( ( typeof ( * _ ## sym ) ) \
& ( installed_librm [ (int) _ ## sym ] ) )
#define LIBRM_CONSTANT( sym ) \
( ( typeof ( * _ ## sym ) ) ( _ ## sym ) )
#define inst_real_to_prot LIBRM_FN ( real_to_prot )
#define inst_prot_to_real LIBRM_FN ( prot_to_real )
#define inst_prot_call LIBRM_FN ( prot_call )
#define inst_real_call LIBRM_FN ( real_call )
#define inst_librm_base LIBRM_VAR ( librm_base )
#define inst_rm_stack LIBRM_VAR ( rm_stack )
#define inst_pm_stack LIBRM_VAR ( pm_stack )
#define inst_librm_ref_count LIBRM_VAR ( librm_ref_count )
#define librm_size LIBRM_CONSTANT ( librm_size )
/* Symbols within local (uninstalled) copy of librm */
extern uint32_t librm_base;
/* Variables in librm.S, present in the normal data segment */
extern uint16_t rm_sp;
extern uint16_t rm_ss;
extern uint16_t rm_cs;
extern uint32_t pm_esp;
/* Functions that librm expects to be able to link to. Included here
* so that the compiler will catch prototype mismatches.
*/
extern void _phys_to_virt ( void );
extern void _virt_to_phys ( void );
extern void gateA20_set ( void );
/*
@@ -132,7 +84,7 @@ extern void remove_from_rm_stack ( void *data, size_t size );
".arch i386\n\t" \
#name ":\n\t" \
asm_code_str "\n\t" \
"lret\n\t" \
"ret\n\t" \
#name "_end:\n\t" \
".equ " #name "_size, " #name "_end - " #name "\n\t" \
".code32\n\t" \
@@ -143,26 +95,19 @@ extern void remove_from_rm_stack ( void *data, size_t size );
/* REAL_CALL: call a real-mode routine via librm */
#define OUT_CONSTRAINTS(...) __VA_ARGS__
#define IN_CONSTRAINTS(...) "m" ( __routine ), ## __VA_ARGS__
#define IN_CONSTRAINTS(...) __VA_ARGS__
#define CLOBBER(...) __VA_ARGS__
#define REAL_CALL( routine, num_out_constraints, out_constraints, \
in_constraints, clobber ) \
do { \
segoff_t __routine = routine; \
__asm__ __volatile__ ( \
"pushl %" #num_out_constraints "\n\t" \
"call 1f\n\t" \
"jmp 2f\n\t" \
"\n1:\n\t" \
"pushl installed_librm\n\t" \
"addl $_real_call, 0(%%esp)\n\t" \
"ret\n\t" \
"\n2:\n\t" \
"addl $4, %%esp\n\t" \
: out_constraints \
: in_constraints \
: clobber \
); \
#define REAL_CALL( routine, num_out_constraints, out_constraints, \
in_constraints, clobber ) \
do { \
__asm__ __volatile__ ( \
"pushl $" #routine "\n\t" \
"call real_call\n\t" \
"addl $4, %%esp\n\t" \
: out_constraints \
: in_constraints \
: clobber \
); \
} while ( 0 )
/* REAL_EXEC: combine RM_FRAGMENT and REAL_CALL into one handy unit */
@@ -170,20 +115,12 @@ extern void remove_from_rm_stack ( void *data, size_t size );
#define REAL_EXEC( name, asm_code_str, num_out_constraints, out_constraints, \
in_constraints, clobber ) \
do { \
segoff_t fragment; \
\
REAL_FRAGMENT ( name, asm_code_str ); \
\
fragment.segment = inst_rm_stack.segment; \
fragment.offset = \
copy_to_rm_stack ( name, FRAGMENT_SIZE ( name ) ); \
\
REAL_CALL ( fragment, num_out_constraints, \
REAL_CALL ( name, num_out_constraints, \
PASSTHRU ( out_constraints ), \
PASSTHRU ( in_constraints ), \
PASSTHRU ( clobber ) ); \
\
remove_from_rm_stack ( NULL, FRAGMENT_SIZE ( name ) ); \
} while ( 0 )
#endif /* ASSEMBLY */

2
src/arch/i386/include/realmode.h
View File

@@ -18,7 +18,7 @@
typedef struct {
uint16_t offset;
uint16_t segment;
} segoff_t PACKED;
} __attribute__ (( packed )) segoff_t;
/* Macro hackery needed to stringify bits of inline assembly */
#define RM_XSTR(x) #x

17
src/arch/i386/include/virtaddr.h
View File

@@ -5,12 +5,17 @@
*
* Don't change these unless you really know what you're doing.
*/
#define PHYSICAL_CS 0x08
#define PHYSICAL_DS 0x10
#define VIRTUAL_CS 0x18
#define VIRTUAL_DS 0x20
#define LONG_CS 0x28
#define LONG_DS 0x30
#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