[comboot] Add COMBOOT and COM32 support

3 files changed, 106 insertions, 0 deletions

diff --git a/src/arch/i386/include/bits/errfile.h b/src/arch/i386/include/bits/errfile.h
index c5b04a26..99927c28 100644
--- a/src/arch/i386/include/bits/errfile.h
+++ b/src/arch/i386/include/bits/errfile.h
@@ -21,6 +21,9 @@
 #define ERRFILE_nbi	       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00040000 )
 #define ERRFILE_pxe_image      ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00050000 )
 #define ERRFILE_elfboot	       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00060000 )
+#define ERRFILE_comboot        ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00070000 )
+#define ERRFILE_com32          ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00080000 )
+#define ERRFILE_comboot_resolv ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00090000 )
 
 #define ERRFILE_undi		 ( ERRFILE_ARCH | ERRFILE_NET | 0x00000000 )
 #define ERRFILE_undiload	 ( ERRFILE_ARCH | ERRFILE_NET | 0x00010000 )
diff --git a/src/arch/i386/include/comboot.h b/src/arch/i386/include/comboot.h
new file mode 100644
index 00000000..1fc3b718
--- /dev/null
+++ b/src/arch/i386/include/comboot.h
@@ -0,0 +1,102 @@
+#ifndef COMBOOT_H
+#define COMBOOT_H
+
+/**
+ * @file
+ *
+ * SYSLINUX COMBOOT
+ */
+
+#include <stdint.h>
+#include <setjmp.h>
+#include <gpxe/in.h>
+
+/** Segment used for COMBOOT PSP and image */
+#define COMBOOT_PSP_SEG 0x07C0
+
+/** Entry point address of COM32 images */
+#define COM32_START_PHYS 0x101000
+
+/** COM32 bounce buffer segment */
+#define COM32_BOUNCE_SEG 0x07C0
+
+/** Size of SYSLINUX file block in bytes */
+#define COMBOOT_FILE_BLOCKSZ 512
+
+/** COMBOOT feature flags (INT 22h AX=15h) */
+#define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0)
+#define COMBOOT_FEATURE_IDLE_LOOP  (1 << 1)
+
+/** Maximum number of shuffle descriptors for 
+ * shuffle and boot functions
+ * (INT 22h AX=0012h, 001Ah, 001Bh)
+ */
+#define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682
+
+typedef union {
+	uint32_t l;
+	uint16_t w[2];
+	uint8_t  b[4];
+} com32_reg32_t;
+
+typedef struct {
+	uint16_t gs;                /* Offset  0 */
+	uint16_t fs;                /* Offset  2 */
+	uint16_t es;                /* Offset  4 */
+	uint16_t ds;                /* Offset  6 */
+
+	com32_reg32_t edi;          /* Offset  8 */
+	com32_reg32_t esi;          /* Offset 12 */
+	com32_reg32_t ebp;          /* Offset 16 */
+	com32_reg32_t _unused_esp;  /* Offset 20 */
+	com32_reg32_t ebx;          /* Offset 24 */
+	com32_reg32_t edx;          /* Offset 28 */
+	com32_reg32_t ecx;          /* Offset 32 */
+	com32_reg32_t eax;          /* Offset 36 */
+
+	com32_reg32_t eflags;       /* Offset 40 */
+} com32sys_t;
+
+typedef struct {
+	uint32_t dest;
+	uint32_t src;
+	uint32_t len;
+} comboot_shuffle_descriptor;
+
+extern void hook_comboot_interrupts ( );
+
+/* These are not the correct prototypes, but it doens't matter, 
+ * as we only ever get the address of these functions;
+ * they are only called from COM32 code running in PHYS_CODE
+ */
+extern void com32_intcall_wrapper ( );
+extern void com32_farcall_wrapper ( );
+extern void com32_cfarcall_wrapper ( );
+
+/* Resolve a hostname to an (IPv4) address */
+extern int comboot_resolv ( const char *name, struct in_addr *address );
+
+/* setjmp/longjmp context buffer used to return after loading an image */
+extern jmp_buf comboot_return;
+
+/* Command line to execute when returning via comboot_return 
+ * with COMBOOT_RETURN_RUN_KERNEL
+ */
+extern char *comboot_kernel_cmdline;
+
+/* Execute comboot_image_cmdline */
+extern void comboot_run_kernel ( );
+
+extern void *com32_external_esp;
+
+#define COMBOOT_RETURN_EXIT 1
+#define COMBOOT_RETURN_RUN_KERNEL 2
+
+extern void comboot_force_text_mode ( void );
+
+#define COMBOOT_VIDEO_GRAPHICS    0x01
+#define COMBOOT_VIDEO_NONSTANDARD 0x02
+#define COMBOOT_VIDEO_VESA        0x04
+#define COMBOOT_VIDEO_NOTEXT      0x08
+
+#endif
diff --git a/src/arch/i386/include/pxe_call.h b/src/arch/i386/include/pxe_call.h
index dc585310..7a38d314 100644
--- a/src/arch/i386/include/pxe_call.h
+++ b/src/arch/i386/include/pxe_call.h
@@ -30,5 +30,6 @@ extern void pxe_hook_int1a ( void );
 extern int pxe_unhook_int1a ( void );
 extern void pxe_init_structures ( void );
 extern int pxe_start_nbp ( void );
+extern __cdecl void pxe_api_call ( struct i386_all_regs *ix86 );
 
 #endif /* _PXE_CALL_H */