Michael Brown
9fa4ac2e9a
Allow imgdownload() to be called without first having to allocate (and so keep track of) an image. Signed-off-by: Michael Brown <mcb30@ipxe.org>
178 lines
4.7 KiB
C
178 lines
4.7 KiB
C
#ifndef COMBOOT_H
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#define COMBOOT_H
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/**
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* @file
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*
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* SYSLINUX COMBOOT
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <setjmp.h>
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#include <ipxe/in.h>
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/** Descriptor in a 32-bit IDT */
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struct idt_descriptor {
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uint16_t offset_low;
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uint16_t selector;
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uint16_t flags;
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uint16_t offset_high;
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} __attribute__ (( packed ));
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/** Operand for the LIDT instruction */
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struct idt_register {
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uint16_t limit;
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uint32_t base;
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} __attribute__ (( packed ));
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/** Entry in the interrupt jump buffer */
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struct ijb_entry {
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uint8_t pusha_instruction;
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uint8_t mov_instruction;
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uint8_t mov_value;
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uint8_t jump_instruction;
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uint32_t jump_destination;
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} __attribute__ (( packed ));
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/** The x86 opcode for "pushal" */
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#define IJB_PUSHA 0x60
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/** The x86 opcode for "movb $imm8,%al" */
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#define IJB_MOV_AL_IMM8 0xB0
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/** The x86 opcode for "jmp rel32" */
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#define IJB_JMP_REL32 0xE9
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/** Flags that specify a 32-bit interrupt gate with DPL=0 */
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#define IDT_INTERRUPT_GATE_FLAGS 0x8E00
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/** Address of COM32 interrupt descriptor table */
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#define COM32_IDT 0x100000
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/** Number of entries in a fully populated IDT */
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#define COM32_NUM_IDT_ENTRIES 256
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/** Address of COM32 interrupt jump buffer */
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#define COM32_IJB 0x100800
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/** Segment used for COMBOOT PSP and image */
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#define COMBOOT_PSP_SEG 0x07C0
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/** Entry point address of COM32 images */
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#define COM32_START_PHYS 0x101000
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/** COM32 bounce buffer segment */
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#define COM32_BOUNCE_SEG 0x07C0
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/** Size of SYSLINUX file block in bytes */
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#define COMBOOT_FILE_BLOCKSZ 512
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/** COMBOOT feature flags (INT 22h AX=15h) */
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#define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0)
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#define COMBOOT_FEATURE_IDLE_LOOP (1 << 1)
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/** Maximum number of shuffle descriptors for
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* shuffle and boot functions
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* (INT 22h AX=0012h, 001Ah, 001Bh)
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*/
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#define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682
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typedef union {
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uint32_t l;
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uint16_t w[2];
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uint8_t b[4];
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} com32_reg32_t;
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typedef struct {
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uint16_t gs; /* Offset 0 */
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uint16_t fs; /* Offset 2 */
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uint16_t es; /* Offset 4 */
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uint16_t ds; /* Offset 6 */
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com32_reg32_t edi; /* Offset 8 */
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com32_reg32_t esi; /* Offset 12 */
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com32_reg32_t ebp; /* Offset 16 */
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com32_reg32_t _unused_esp; /* Offset 20 */
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com32_reg32_t ebx; /* Offset 24 */
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com32_reg32_t edx; /* Offset 28 */
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com32_reg32_t ecx; /* Offset 32 */
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com32_reg32_t eax; /* Offset 36 */
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com32_reg32_t eflags; /* Offset 40 */
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} com32sys_t;
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typedef struct {
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uint32_t eax; /* Offset 0 */
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uint32_t ecx; /* Offset 4 */
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uint32_t edx; /* Offset 8 */
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uint32_t ebx; /* Offset 12 */
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uint32_t esp; /* Offset 16 */
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uint32_t ebp; /* Offset 20 */
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uint32_t esi; /* Offset 24 */
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uint32_t edi; /* Offset 28 */
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uint32_t eip; /* Offset 32 */
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} syslinux_pm_regs;
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typedef struct {
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uint16_t es; /* Offset 0 */
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uint16_t _unused_cs; /* Offset 2 */
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uint16_t ds; /* Offset 4 */
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uint16_t ss; /* Offset 6 */
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uint16_t fs; /* Offset 8 */
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uint16_t gs; /* Offset 10 */
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uint32_t eax; /* Offset 12 */
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uint32_t ecx; /* Offset 16 */
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uint32_t edx; /* Offset 20 */
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uint32_t ebx; /* Offset 24 */
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uint32_t esp; /* Offset 28 */
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uint32_t ebp; /* Offset 32 */
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uint32_t esi; /* Offset 36 */
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uint32_t edi; /* Offset 40 */
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uint16_t ip; /* Offset 44 */
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uint16_t cs; /* Offset 46 */
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} syslinux_rm_regs;
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typedef struct {
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uint32_t dest;
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uint32_t src;
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uint32_t len;
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} comboot_shuffle_descriptor;
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extern void hook_comboot_interrupts ( );
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extern void unhook_comboot_interrupts ( );
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/* These are not the correct prototypes, but it doens't matter,
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* as we only ever get the address of these functions;
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* they are only called from COM32 code running in PHYS_CODE
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*/
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extern void com32_intcall_wrapper ( );
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extern void com32_farcall_wrapper ( );
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extern void com32_cfarcall_wrapper ( );
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extern void com32_irq_wrapper ( );
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/* Resolve a hostname to an (IPv4) address */
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extern int comboot_resolv ( const char *name, struct in_addr *address );
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/* setjmp/longjmp context buffer used to return after loading an image */
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extern rmjmp_buf comboot_return;
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extern void *com32_external_esp;
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#define COMBOOT_EXIT 1
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#define COMBOOT_EXIT_RUN_KERNEL 2
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#define COMBOOT_EXIT_COMMAND 3
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extern void comboot_force_text_mode ( void );
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#define COMBOOT_VIDEO_GRAPHICS 0x01
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#define COMBOOT_VIDEO_NONSTANDARD 0x02
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#define COMBOOT_VIDEO_VESA 0x04
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#define COMBOOT_VIDEO_NOTEXT 0x08
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#endif
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