1 #ifndef COMBOOT_H 2 #define COMBOOT_H 3 4 /** 5 * @file 6 * 7 * SYSLINUX COMBOOT 8 */ 9 10 FILE_LICENCE ( GPL2_OR_LATER ); 11 12 #include <stdint.h> 13 #include <setjmp.h> 14 #include <gpxe/in.h> 15 16 /** Segment used for COMBOOT PSP and image */ 17 #define COMBOOT_PSP_SEG 0x07C0 18 19 /** Entry point address of COM32 images */ 20 #define COM32_START_PHYS 0x101000 21 22 /** COM32 bounce buffer segment */ 23 #define COM32_BOUNCE_SEG 0x07C0 24 25 /** Size of SYSLINUX file block in bytes */ 26 #define COMBOOT_FILE_BLOCKSZ 512 27 28 /** COMBOOT feature flags (INT 22h AX=15h) */ 29 #define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0) 30 #define COMBOOT_FEATURE_IDLE_LOOP (1 << 1) 31 32 /** Maximum number of shuffle descriptors for 33 * shuffle and boot functions 34 * (INT 22h AX=0012h, 001Ah, 001Bh) 35 */ 36 #define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682 37 38 typedef union { 39 uint32_t l; 40 uint16_t w[2]; 41 uint8_t b[4]; 42 } com32_reg32_t; 43 44 typedef struct { 45 uint16_t gs; /* Offset 0 */ 46 uint16_t fs; /* Offset 2 */ 47 uint16_t es; /* Offset 4 */ 48 uint16_t ds; /* Offset 6 */ 49 50 com32_reg32_t edi; /* Offset 8 */ 51 com32_reg32_t esi; /* Offset 12 */ 52 com32_reg32_t ebp; /* Offset 16 */ 53 com32_reg32_t _unused_esp; /* Offset 20 */ 54 com32_reg32_t ebx; /* Offset 24 */ 55 com32_reg32_t edx; /* Offset 28 */ 56 com32_reg32_t ecx; /* Offset 32 */ 57 com32_reg32_t eax; /* Offset 36 */ 58 59 com32_reg32_t eflags; /* Offset 40 */ 60 } com32sys_t; 61 62 typedef struct { 63 uint32_t eax; /* Offset 0 */ 64 uint32_t ecx; /* Offset 4 */ 65 uint32_t edx; /* Offset 8 */ 66 uint32_t ebx; /* Offset 12 */ 67 uint32_t esp; /* Offset 16 */ 68 uint32_t ebp; /* Offset 20 */ 69 uint32_t esi; /* Offset 24 */ 70 uint32_t edi; /* Offset 28 */ 71 72 uint32_t eip; /* Offset 32 */ 73 } syslinux_pm_regs; 74 75 typedef struct { 76 uint16_t es; /* Offset 0 */ 77 uint16_t _unused_cs; /* Offset 2 */ 78 uint16_t ds; /* Offset 4 */ 79 uint16_t ss; /* Offset 6 */ 80 uint16_t fs; /* Offset 8 */ 81 uint16_t gs; /* Offset 10 */ 82 83 uint32_t eax; /* Offset 12 */ 84 uint32_t ecx; /* Offset 16 */ 85 uint32_t edx; /* Offset 20 */ 86 uint32_t ebx; /* Offset 24 */ 87 uint32_t esp; /* Offset 28 */ 88 uint32_t ebp; /* Offset 32 */ 89 uint32_t esi; /* Offset 36 */ 90 uint32_t edi; /* Offset 40 */ 91 92 uint16_t ip; /* Offset 44 */ 93 uint16_t cs; /* Offset 46 */ 94 } syslinux_rm_regs; 95 96 typedef struct { 97 uint32_t dest; 98 uint32_t src; 99 uint32_t len; 100 } comboot_shuffle_descriptor; 101 102 extern void hook_comboot_interrupts ( ); 103 extern void unhook_comboot_interrupts ( ); 104 105 /* These are not the correct prototypes, but it doens't matter, 106 * as we only ever get the address of these functions; 107 * they are only called from COM32 code running in PHYS_CODE 108 */ 109 extern void com32_intcall_wrapper ( ); 110 extern void com32_farcall_wrapper ( ); 111 extern void com32_cfarcall_wrapper ( ); 112 113 /* Resolve a hostname to an (IPv4) address */ 114 extern int comboot_resolv ( const char *name, struct in_addr *address ); 115 116 /* setjmp/longjmp context buffer used to return after loading an image */ 117 extern rmjmp_buf comboot_return; 118 119 /* Replacement image when exiting with COMBOOT_EXIT_RUN_KERNEL */ 120 extern struct image *comboot_replacement_image; 121 122 extern void *com32_external_esp; 123 124 #define COMBOOT_EXIT 1 125 #define COMBOOT_EXIT_RUN_KERNEL 2 126 #define COMBOOT_EXIT_COMMAND 3 127 128 extern void comboot_force_text_mode ( void ); 129 130 #define COMBOOT_VIDEO_GRAPHICS 0x01 131 #define COMBOOT_VIDEO_NONSTANDARD 0x02 132 #define COMBOOT_VIDEO_VESA 0x04 133 #define COMBOOT_VIDEO_NOTEXT 0x08 134 135 #endif 136
