* Patch by Marc Singer, 29 May 2003:

[karo-tx-uboot.git] / lib_i386 / bios.h

diff --git a/lib_i386/bios.h b/lib_i386/bios.h
new file mode 100644 (file)
index 0000000..876fe31
--- /dev/null
+++ b/lib_i386/bios.h
@@ -0,0 +1,94 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ * 
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _BIOS_H_
+#define _BIOS_H_
+
+#define OFFS_ES      0     /* 16bit */
+#define OFFS_GS      2     /* 16bit */
+#define OFFS_DS      4     /* 16bit */
+#define OFFS_EDI     6     /* 32bit */
+#define OFFS_DI      6     /* low 16 bits of EDI */   
+#define OFFS_ESI     10    /* 32bit */
+#define OFFS_SI      10    /* low 16 bits of ESI */   
+#define OFFS_EBP     14    /* 32bit */
+#define OFFS_BP      14    /* low 16 bits of EBP */
+#define OFFS_ESP     18    /* 32bit */
+#define OFFS_SP      18    /* low 16 bits of ESP */
+#define OFFS_EBX     22    /* 32bit */
+#define OFFS_BX      22    /* low 16 bits of EBX */
+#define OFFS_BL      22    /* low  8 bits of BX */
+#define OFFS_BH      23    /* high 8 bits of BX */
+#define OFFS_EDX     26    /* 32bit */
+#define OFFS_DX      26    /* low 16 bits of EBX */
+#define OFFS_DL      26    /* low  8 bits of BX */
+#define OFFS_DH      27    /* high 8 bits of BX */
+#define OFFS_ECX     30    /* 32bit */
+#define OFFS_CX      30    /* low 16 bits of EBX */
+#define OFFS_CL      30    /* low  8 bits of BX */
+#define OFFS_CH      31    /* high 8 bits of BX */
+#define OFFS_EAX     34    /* 32bit */
+#define OFFS_AX      34    /* low 16 bits of EBX */
+#define OFFS_AL      34    /* low  8 bits of BX */
+#define OFFS_AH      35    /* high 8 bits of BX */
+#define OFFS_VECTOR  38    /* 16bit */
+#define OFFS_IP      40    /* 16bit */
+#define OFFS_CS      42    /* 16bit */
+#define OFFS_FLAGS   44    /* 16bit */   
+
+#define SEGMENT      0x40
+#define STACK       0x800                      /* stack at 0x40:0x800 -> 0x800 */
+
+/* save general registers */
+/* save some segments     */
+/* save callers stack segment .. */
+/* ... in gs */
+       /* setup my segments */ 
+       /* setup BIOS stackpointer */ 
+       
+#define MAKE_BIOS_STACK \
+       pushal          ; \
+       pushw   %ds     ; \
+       pushw   %gs     ; \
+       pushw   %es     ; \
+       pushw   %ss     ; \
+       popw    %gs     ; \
+       movw    $SEGMENT,%ax ; \
+       movw    %ax,%ds ; \
+       movw    %ax,%es ; \
+       movw    %ax,%ss ; \
+       movw    %sp,%bp ; \
+       movw    $STACK,%sp
+
+#define RESTORE_CALLERS_STACK \
+       pushw   %gs     ;                       /* restore callers stack segment */ \
+       popw    %ss     ; \
+       movw    %bp,%sp ;                       /* restore stackpointer */ \
+               \
+       popw    %es     ;                       /* restore segment selectors */ \
+       popw    %gs     ; \
+       popw    %ds     ; \
+               \
+       popal                                   /* restore GP registers */ 
+
+#endif