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/* Callout/callback interface for Etherboot
*
* This file provides the mechanisms for making calls from Etherboot
* to external programs and vice-versa.
*
* Initial version by Michael Brown <mbrown@fensystems.co.uk>, January 2004.
*
* $Id$
*/
#ifndef CALLBACKS_ARCH_H
#define CALLBACKS_ARCH_H
/* Skip the definitions that won't make sense to the assembler */
#ifndef ASSEMBLY
/* Struct to hold general-purpose register values. PUSHAL and POPAL
* can work directly with this structure; do not change the order of
* registers.
*/
typedef struct {
union {
uint16_t di;
uint32_t edi;
};
union {
uint16_t si;
uint32_t esi;
};
union {
uint16_t bp;
uint32_t ebp;
};
union {
uint16_t sp;
uint32_t esp;
};
union {
struct {
uint8_t bl;
uint8_t bh;
} PACKED;
uint16_t bx;
uint32_t ebx;
};
union {
struct {
uint8_t dl;
uint8_t dh;
} PACKED;
uint16_t dx;
uint32_t edx;
};
union {
struct {
uint8_t cl;
uint8_t ch;
} PACKED;
uint16_t cx;
uint32_t ecx;
};
union {
struct {
uint8_t al;
uint8_t ah;
} PACKED;
uint16_t ax;
uint32_t eax;
};
} regs_t;
/* Struct to hold segment register values. Don't change the order;
* many bits of assembly code rely on it.
*/
typedef struct {
uint16_t cs;
uint16_t ss;
uint16_t ds;
uint16_t es;
uint16_t fs;
uint16_t gs;
} PACKED seg_regs_t;
/* Struct for a GDT descriptor */
typedef struct {
uint16_t limit;
uint32_t address;
uint16_t padding;
} PACKED gdt_descriptor_t;
/* Struct for a GDT entry. Use GDT_SEGMENT() to fill it in.
*/
typedef struct {
uint16_t limit_0_15;
uint16_t base_0_15;
uint8_t base_16_23;
uint8_t accessed__type__sflag__dpl__present;
uint8_t limit_16_19__avl__size__granularity;
uint8_t base_24_31;
} PACKED gdt_segment_t;
#define GDT_SEGMENT(base,limit,type,sflag,dpl,avl,size,granularity) \
( (gdt_segment_t) { \
( (limit) & 0xffff ), \
( (base) & 0xffff ), \
( ( (base) >> 16 ) & 0xff ), \
( ( 1 << 0 ) | ( (type) << 1 ) | \
( (sflag) << 4 ) | ( (dpl) << 5 ) | ( 1 << 7 ) ), \
( ( (limit) >> 16 ) | \
( (avl) << 4 ) | ( (size) << 5 ) | ( (granularity) << 7 ) ),\
( (base) >> 24 ) \
} )
#define GDT_SEGMENT_BASE(gdt_segment) \
( (gdt_segment)->base_0_15 | \
(gdt_segment)->base_16_23 << 16 | \
(gdt_segment)->base_24_31 << 24 )
#define GDT_SEGMENT_LIMIT(gdt_segment) \
( (gdt_segment)->limit_0_15 | \
( ( (gdt_segment)->limit_16_19__avl__size__granularity \
& 0xf ) << 16 ) )
#define GDT_SEGMENT_GRANULARITY(gdt_segment) \
( ( (gdt_segment)->limit_16_19__avl__size__granularity \
& 0x80 ) >> 7 )
#define GDT_SEGMENT_TYPE(gdt_segment) \
( ( (gdt_segment)->accessed__type__sflag__dpl__present & 0x0e ) >> 1 )
#define GDT_SEGMENT_SIZE(gdt_segment) \
( ( (gdt_segment)->limit_16_19__avl__size__granularity \
& 0x60 ) >> 5 )
#define GDT_TYPE_DATA (0x0)
#define GDT_TYPE_STACK (0x2)
#define GDT_TYPE_WRITEABLE (0x1)
#define GDT_TYPE_CODE (0x6)
#define GDT_TYPE_EXEC_ONLY_CODE (0x4)
#define GDT_TYPE_CONFORMING (0x1)
#define GDT_SFLAG_SYSTEM (0)
#define GDT_SFLAG_NORMAL (1)
#define GDT_AVL_NORMAL (0)
#define GDT_SIZE_16BIT (0x0)
#define GDT_SIZE_32BIT (0x2)
#define GDT_SIZE_64BIT (0x1)
#define GDT_SIZE_UNKNOWN (0x3)
#define GDT_GRANULARITY_SMALL (0)
#define GDT_GRANULARITY_LARGE (1)
#define GDT_SEGMENT_NORMAL(base,limit,type,size,granularity) \
GDT_SEGMENT ( base, limit, type, \
GDT_SFLAG_NORMAL, 0, GDT_AVL_NORMAL, \
size, granularity )
/* Protected mode code segment */
#define GDT_SEGMENT_PMCS(base) GDT_SEGMENT_NORMAL ( \
base, 0xfffff, GDT_TYPE_CODE | GDT_TYPE_CONFORMING, \
GDT_SIZE_32BIT, GDT_GRANULARITY_LARGE )
#define GDT_SEGMENT_PMCS_PHYS GDT_SEGMENT_PMCS(0)
/* Protected mode data segment */
#define GDT_SEGMENT_PMDS(base) GDT_SEGMENT_NORMAL ( \
base, 0xfffff, GDT_TYPE_DATA | GDT_TYPE_WRITEABLE, \
GDT_SIZE_32BIT, GDT_GRANULARITY_LARGE )
#define GDT_SEGMENT_PMDS_PHYS GDT_SEGMENT_PMDS(0)
/* Real mode code segment */
/* Not sure if there's any reason to use GDT_TYPE_EXEC_ONLY_CODE
* instead of just GDT_TYPE_CODE, but that's what our old GDT did and
* it worked, so I'm not changing it.
*/
#define GDT_SEGMENT_RMCS(base) GDT_SEGMENT_NORMAL ( \
base, 0xffff, GDT_TYPE_EXEC_ONLY_CODE | GDT_TYPE_CONFORMING, \
GDT_SIZE_16BIT, GDT_GRANULARITY_SMALL )
/* Real mode data segment */
#define GDT_SEGMENT_RMDS(base) GDT_SEGMENT_NORMAL ( \
base, 0xffff, GDT_TYPE_DATA | GDT_TYPE_WRITEABLE, \
GDT_SIZE_16BIT, GDT_GRANULARITY_SMALL )
/* Long mode code segment */
#define GDT_SEGMENT_LMCS(base) GDT_SEGMENT_NORMAL ( \
base, 0xfffff, GDT_TYPE_CODE | GDT_TYPE_CONFORMING, \
GDT_SIZE_64BIT, GDT_GRANULARITY_LARGE )
#define GDT_SEGMENT_LMCS_PHYS GDT_SEGMENT_LMCS(0)
/* Long mode data segment */
/* AFIACT, GDT_SIZE_64BIT applies only to code segments */
#define GDT_SEGMENT_LMDS(base) GDT_SEGMENT_NORMAL ( \
base, 0xfffff, GDT_TYPE_DATA | GDT_TYPE_WRITEABLE, \
GDT_SIZE_32BIT, GDT_GRANULARITY_LARGE )
#define GDT_SEGMENT_LMDS_PHYS GDT_SEGMENT_LMDS(0)
/* Template for creating GDT structures (including segment register
* lists), suitable for passing as parameters to external_call().
*/
#define GDT_STRUCT_t(num_segments) \
struct { \
gdt_descriptor_t descriptor; \
gdt_segment_t segments[num_segments]; \
} PACKED
/* And utility function for filling it in */
#define GDT_ADJUST(structure) { \
(structure)->descriptor.address = \
virt_to_phys(&((structure)->descriptor.limit)); \
(structure)->descriptor.limit = \
sizeof((structure)->segments) + 8 - 1; \
(structure)->descriptor.padding = 0; \
}
/* Data passed in to in_call() by assembly wrapper.
*/
typedef struct {
regs_t regs;
seg_regs_t seg_regs;
gdt_descriptor_t gdt_desc;
uint32_t flags;
struct {
uint32_t offset;
uint32_t segment;
} ret_addr;
} PACKED i386_pm_in_call_data_t;
typedef struct {
seg_regs_t seg_regs;
union {
uint16_t pad;
uint16_t prefix_sp;
};
uint16_t flags;
struct {
uint16_t offset;
uint16_t segment;
} ret_addr;
uint32_t orig_opcode;
} PACKED i386_rm_in_call_data_t;
typedef struct {
i386_pm_in_call_data_t *pm;
i386_rm_in_call_data_t *rm;
} i386_in_call_data_t;
#define in_call_data_t i386_in_call_data_t
/* Function prototypes
*/
extern int install_rm_callback_interface ( void *address, size_t available );
#endif /* ASSEMBLY */
#define RM_IN_CALL (0)
#define RM_IN_CALL_FAR (2)
#endif /* CALLBACKS_ARCH_H */
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